To check if a given matrix is orthogonal, first find the transpose of that matrix. ( . 0 0 1 0 1 0 For example, if Q = 1 0 then QT = 0 0 1 . ≤ v { 2 . The norm of the columns (and the rows) of an orthogonal matrix must be one. is a basis for W Then: We compute the standard matrix of the orthogonal projection in the same way as for any other transformation: by evaluating on the standard coordinate vectors. â¢ Find the highest full row rank matrix L â¦ is an orthogonal matrix. : ,..., n W (It is always the case that A Orthogonal matrix is an important matrix in linear algebra, it is also widely used in machine learning. over W Definition An matrix is called 8â8 E orthogonally diagonalizable if there is an orthogonal matrix and a diagonal matrix for which Y H EÅYHY ÐÅYHY ÑÞ" X Thus, an orthogonally diagonalizable matrix is a special kind of diagonalizable matrix: not only can we factor , but we can find an matrix that woEÅTHT" orthogonal YÅT rks. Thus the vectors A and B are orthogonal to each other if and only if Note: In a compact form the above expression can be wriiten as (A^T)B. matrix with linearly independent columns and let W 1 T m The norm of the columns (and the rows) of an orthogonal matrix must be one. be an m , 1 To apply the corollary, we take A } If a matrix A is an orthogonal matrix, it shoud be n*n. The feature of an orthogonal matrix A. The vector x ,..., The associated system is which reduces to the system Set , then we have Set Then But if we set then We have seen that if A and B are similar, then A n can be expressed easily in terms of B n. This is the currently selected item. T Compute the matrix A T A and the vector A T x. Figure 1 – Gram Schmidt Process Maybe you mean that the column should be [1;1;1;1;1;1] /sqrt(6). by the theorem. A = Example of an orthogonal matrix:. Gram-Schmidt example with 3 basis vectors. Ac is consistent, but A be a vector in R × A Find an orthogonal matrix Î£ = (Î£ 1, Î£ 2) such that(E ' 1, 0) = E '(Î£ 1, Î£ 2) with full column rank E' 1. − be a subspace of R n , To test whether a matrix is an orthogonal matrix, we multiply the matrix to its transpose. If they are orthonormal, all you have to do to find these projections is a simple dot product. a [a1,a2,a3] +t [1,1,1] in X1 + X2 + X3 = 0 Solve for t t = -1/3a1 -1/3a2-1/3a3. To find a perpendicular slope, we take the negative reciprocal (flip it upside down and add a negative sign). be a subspace of R . for projection onto W x Find an orthonormal basis of W. Hint: use the Gram-Schmidt orthogonalization. n ,..., } A . Sometimes there is no inverse at all Multiplying Matrices Determinant of a Matrix Matrix Calculator Algebra Index. is square and the equation A ) + with respect to W } = What is Orthogonal Matrix? If matrix Q has n rows then it is an orthogonal matrix (as vectors q1, q2, q3, â¦, qn are assumed to be orthonormal earlier) Properties of Orthogonal Matrix. } The determinant of any orthogonal matrix is either +1 or −1. v . has three different eigenvalues. , be the matrix with columns v T | = − When A R Let A = [1 0 1 0 1 0]. Orthogonal matrices are defined by two key concepts in linear algebra: the transpose of a matrix and the inverse of a matrix. we have. In order to find the matrix P we need to find an eigenvector associated to -2. [A] [A] T = 1. or. > The Matrix of an Orthogonal projection The transpose allows us to write a formula for the matrix of an orthogonal projection. + A 1 Orthogonal matrix is important in many applications because of its properties. . Both Qand T 0 1 0 1 0 0 are orthogonal matrices, and their product is the identity. we have. m . When we multiply it with its transpose, we get identity matrix. We thus get our first equation \$\$\boxed{R(A)^{\perp} = N(A)}\$\$ It's also worth noting that in a previous post, we showed that \$\$\boxed{C(A) = R(A^T)}\$\$ This is pretty intuitive. : A x . Let v1 = [2 / 3 2 / 3 1 / 3] be a vector in R3. Orthogonal matrices are defined by two key concepts in linear algebra: the transpose of a matrix and the inverse of a matrix. 2 How to Find the Null Space of a Matrix. n Therefore, we have found a basis of eigenvectors, with associated eigenvalues 1,...,1,0,...,0 n , T , Here is a method to compute the orthogonal decomposition of a vector x v Property 5: If A is an m × n orthogonal matrix and B is an n × p orthogonal then AB is orthogonal. = Understand the orthogonal decomposition of a vector with respect to a subspace. The null space of the matrix is the orthogonal complement of the span. I know you would be able to use cross product if they were in R3 but I am stuck as to how you would find it in R4 as that is not possible. Eigen-everything. . In fact, there is a general result along these lines. When you transpose a matrixâ¦ is a multiple of u = be a vector in R our formula for the projection can be derived very directly and simply. to be the m x in R 0 0 1 0 1 0 For example, if Q = 1 0 then QT = 0 0 1 . = Let W and let Q be an orthogonal n×n matrix. + Find an orthogonal basis of the subspace Span(S) of R4. Then A is diagonalizable. For an orthogonal matrix AA T = I. 2 Properties of an Orthogonal Matrix. i n in R I choose A=[v1;v2] as basis vector combination, where v1=[1 0 1 0] and v2=[0 1 0 â¦ In that 1 Then − Note that the first case does not imply its rows are orthogonalâ¦ T ,..., Non-Example. , and let A x Example using orthogonal change-of-basis matrix to find transformation matrix. I have to calculate the A matrix whose columns are the basis vectors of given subspace. (the orthogonal decomposition of the zero vector is just 0 i n As mentioned above, the transpose of an orthogonal matrix is also orthogonal. ones and n v This multiple is chosen so that x In this tutorial, we will dicuss what it is and how to create a random orthogonal matrix with pyhton. Let W )= spectral decomposition, Rate this tutorial or give your comments about this tutorial, The row vector and the column vector of matrix, Both Hermitian and Unitary matrix (including. then moves to x is a basis for W Basis vectors. ⊥ Now we use the diagonalization theorem in Section 5.4. − L The concept of orthogonality for a matrix is defined for just one matrix: A matrix is orthogonal if each of its column vectors is orthogonal to all other column vectors and has norm 1. indeed, if { m ( 0 } be a subspace of R Thus, there is no such orthogonal transformation T. 4. m row space column space A )= matrix and compute the modal matrix from 2 vectors are orthogonal if their dot products are zero, so to see if every row is orthogonal, compute the dot product of every row with every other row and see if theyâre all zero; running time [math]O(h^2 w)[/math]. Figure 1 â Gram Schmidt Process To create random orthogonal matrix as in the interactive program below, I created random To determine if a matrix is orthogonal, we need to multiply the matrix by it's transpose, and see if we get the identity matrix., Since we get the identity matrix, then we know that is an orthogonal matrix. Let W be a subspace of R^4 and we are given a basis. Let S = {v1, v2, …, vk} be a set of nonzero vectors in Rn. , = An orthogonal matrix Q is necessarily invertible (with inverse Q −1 = Q T), unitary (Q −1 = Q ∗),where Q ∗ is the Hermitian adjoint (conjugate transpose) of Q, and therefore normal (Q ∗ Q = QQ ∗) over the real numbers. , as a function of x . is a basis for W For each of the following questions, answer: âYes, always,â or âSometimes yes, sometimes not,â or âNo, never.â Justify your answer, as much as possible. This can be generalized and extended to 'n' dimensions as described in group theory. and a basis v The fifth assertion is equivalent to the second, by this fact in Section 5.1. In particular, an orthogonal matrix is always invertible, and A^(-1)=A^(T). If Q is square, then QTQ = I tells us that QT = Qâ1. : transpose ,..., . n → â¢ Calculate (F 1 ' â F 2 ') = F 1 (Î£ 1, Î£ 2). . Suppose I want to find the orthogonal projection of (x1,x2,y1,y2) such that x1=x2, y1=y2. Orthogonal vectors and subspaces In this lecture we learn what it means for vectors, bases and subspaces to be orthogonal. v Eigen vectors because v If Q is square, then QTQ = I tells us that QT = Q−1. So, a column of 1's is impossible. Free Matrix Diagonalization calculator - diagonalize matrices step-by-step This website uses cookies to ensure you get the best experience. : In the context of the above recipe, if we start with a basis of W ( is automatically invertible! is a basis for W >. for W T 7 Finding stationary distribution of a markov process given a transition probability matrix = − 0, )= 1 It will be an orthonormal matrix only when norm(k)==1 (which implies k=1/sqrt(3) in your examples, as the others have noted). 1 = 0 by T Orthogonal matrices also have a deceptively simple definition, which gives a helpful starting point for understanding their general algebraic properties. onto a line L W with basis v Learn the basic properties of orthogonal projections as linear transformations and as matrix transformations. T x Orthogonal matrix multiplication can be used to represent rotation, there is an equivalence with quaternion multiplication as described here. = v } By the Gram-Schmidt process, we can transform it into an orthonormal basis. T An orthogonal matrix â¦ = )= Let W A cu Now, if the product is an identity matrix, the … … x , Cb = 0 b = 0 since C has L.I. . Here's a similar question on math.stackexchange, perhaps one of the answers there would be helpful? x To find the inverse of a 2x2 matrix: swap the positions of a and d, put negatives in front of b and c, and divide everything by the determinant (ad-bc). A x The reflection of x say x , x 2 T Recipes: orthogonal projection onto a line, orthogonal decomposition by solving a system of equations, orthogonal projection via a complicated matrix product. = ( = v n Find orthogonal complement for given matrix. is in Nul : Orthogonal matrices preserve angles and lengths. R Examples : Input: 1 0 0 0 1 0 0 0 1 Output: Yes Given Matrix is an orthogonal matrix. A A A For the final assertion, we showed in the proof of this theorem that there is a basis of R To do this we need a subset of all possible matrices known as an orthogonal matrix. ( Suppose that A orthogonal vector Then, multiply the given matrix with the transpose. A T ( 1 The âbig pictureâ of this course is that the row space of a matrixâ is orthog­ onal to its nullspace, and its column space is orthogonal to its left nullspace. We are given a matrix, we need to check whether it is an orthogonal matrix or not. Proof: If A and B are orthogonal, then (AB) T (AB) = (B T A T)(AB) = B T (A T A)B = B T IB = B T B = I Example 1: Find an orthonormal basis for the three column vectors which are shown in range A4:C7 of Figure 1. m ones and n To nd the matrix of the orthogonal projection onto V, the way we rst discussed, takes three steps: (1) Find a basis ~v 1, ~v 2, ..., ~v m for V. (2) Turn the basis ~v i into an orthonormal basis ~u i, using the Gram-Schmidt algorithm. v Ac = T You can also try to input your own matrix to test whether it is an orthogonal matrix or not. m + Span = =( then it turns out that the square matrix A In the special case where we are projecting a vector x A ,..., So, a column of 1's is impossible. A nice property enjoyed by orthogonal sets is that they are automatically linearly independent. ,..., as a matrix transformation with matrix A W ) v When you transpose a … In other words, Aw = Î»w, where w is the eigenvector, A is a square matrix, w is a vector and Î» is a constant. , , 1 . is equal to its ( A matrix is orthogonal if the v v But 0 In the previous example, we could have used the fact that. Col ) ) T If we want to find the orthogonal trajectories, and we know that theyâre perpendicular to our family everywhere, then we want a slope for the orthogonal trajectories that is perpendicular to the slope of the original family. , R A = [1 -2 -1 0 1] [0 0 -1 1 1] [-1 2 0 2 2] [0 0 1 2 5]-Suppose each column is a vector. , columns. The Gram-Schmidt process. Understand the relationship between orthogonal decomposition and orthogonal projection. To compute the orthogonal complement of a general subspace, usually it is best to rewrite the subspace as the column space or null space of a matrix, as in this important note in Section 2.6. is. , { Example. : L We will show that Nul zeros on the diagonal. This function turns out to be a linear transformation with many nice properties, and is a good example of a linear transformation which is not originally defined as a matrix transformation. ) Suppose that S is an orthogonal set. Each v 1 Here is a method to compute the orthogonal decomposition of a vector x with respect to W : Rewrite W as the column space of a matrix A. < of the (3) This relation make orthogonal matrices particularly easy to compute with, since the transpose operation is much simpler than computing an inverse. is an eigenvector of B one starts at x A n W ⊥ Theorem. 0. n When you click Random Example button, it will create random input matrix to provide you with many examples of both orthogonal and non-orthogonal matrices. onto W We also showed that A is diagonalizable. − so Nul Col OSU Math 2568 Midterm Exam. ) . then. In this case, we have already expressed T and let x m Then c v Form the augmented matrix for the matrix equation, This equation is always consistent; choose one solution. and let B Hence the vectors are orthogonal to each other. = m ( Understand the relationship between orthogonal decomposition and the closest vector on / distance to a subspace. m Ac We are given a matrix, we need to check whether it is an orthogonal matrix or not. x If we want to find the orthogonal trajectories, and we know that they’re perpendicular to our family everywhere, then we want a slope for the orthogonal trajectories that is perpendicular to the slope of the original family. Maybe you mean that the column should be [1;1;1;1;1;1] /sqrt(6). The null space of the matrix is the orthogonal complement of the span. , Well, if you're orthogonal to all of these members, all of these rows in your matrix, you're also orthogonal to any linear combination of them. x Let x m 0, 0 The matrix A is orthogonal if. need not be invertible in general. Some important properties of orthogonal matrix are, See also Index A n where the middle matrix in the product is the diagonal matrix with m Now without calculations (though for a 2x2 matrix these are simple indeed), this A matrix is . We can translate the above properties of orthogonal projections into properties of the associated standard matrix. Next lesson. is perpendicular to u ( , by the corollary. You take the zero vector, dot it with anything, you're going to get 0. So the zero vector is always going to be a member of any orthogonal complement, because it obviously is always going to be true for this condition right here. m A and let c Let W be a subspace of R4 with a basis {,}. × n . m u Definition An matrix is called 8‚8 E orthogonally diagonalizable if there is an orthogonal matrix and a diagonal matrix for which Y H EœYHY ÐœYHY ÑÞ" X Thus, an orthogonally diagonalizable matrix is a special kind of diagonalizable matrix: not only can we factor , but we can find an matrix that woEœTHT" orthogonal YœT rks. Next x (2) In component form, (a^(-1))_(ij)=a_(ji). is defined to be the vector. I think it may involve putting it into a matrix and finding free variables but unsure. T Suppose CTCb = 0 for some b. bTCTCb = (Cb)TCb = (Cb) â¢(Cb) = Cb 2 = 0. A n×n matrix A is an orthogonal matrix if AA^(T)=I, (1) where A^(T) is the transpose of A and I is the identity matrix. 1 We thus get our first equation R(A)⊥ =N (A) R (A) ⊥ = N (A) It's also worth noting that in a previous post, we showed that C(A)=R(AT) C (A) = R (A T) This is pretty intuitive. = 2 Then: The first four assertions are translations of properties 5, 3, 4, and 2, respectively, using this important note in Section 3.1 and this theorem in Section 3.4. 0, as desired. One way to think about a 3x3 orthogonal matrix is, instead of a 3x3 array of scalars, as 3 vectors. ( If the result is an identity matrix, then the input matrix is an orthogonal matrix. i m Learn more about orthogonal complement, matrix, linear equation Free Gram-Schmidt Calculator - Orthonormalize sets of vectors using the Gram-Schmidt process step by step A To be explicit, we state the theorem as a recipe: Let W Since and, a fortiori, are finite-dimensional, we can find a basis of . Orthogonal Projection Matrix â¢Let C be an n x k matrix whose columns form a basis for a subspace W ðð= ð â1 ð n x n Proof: We want to prove that CTC has independent columns. m R Let W be a subspace of R n and let x be a vector in R n. [A] -1 = [A] T. Proposition (The orthogonal complement of a column space) Let A be a matrix and let W = Col (A). − T T By using this website, you agree to our Cookie Policy. A A v gives you a square matrix with mutually orthogonal columns, no matter what's the vector kk. ,..., 0 × Thus, matrix be a subspace of R Since computing matrix inverse is rather difficult while computing matrix transpose is straightforward, orthogonal matrix make difficult operation easier. . ( We leave it to the reader to check using the definition that: Linear Transformations and Matrix Algebra, (Orthogonal decomposition with respect to the, Recipe: Orthogonal projection onto a line, (Simple proof for the formula for projection onto a line), Recipe: Compute an orthogonal decomposition, Hints and Solutions to Selected Exercises, defining properties of linearity in Section 3.3. matrix A , To find a perpendicular slope, we take the negative reciprocal (flip it upside down and add a negative sign). so Ac A square orthonormal matrix Q is called an orthogonal matrix. means solving the matrix equation A Orthogonal matrices also have a deceptively simple definition, which gives a helpful starting point for understanding their general algebraic properties. Proof: If A and B are orthogonal, then (AB) T (AB) = (B T A T)(AB) = B T (A T A)B = B T IB = B T B = I Example 1: Find an orthonormal basis for the three column vectors which are shown in range A4:C7 of Figure 1. v However, since you already have a basis for W The Matrix of an Orthogonal projection The transpose allows us to write a formula for the matrix of an orthogonal projection. Explanation: . zeros). Both Qand T 0 1 0 1 0 0 are orthogonal matrices, and their product is the identity. it is faster to multiply out the expression A A , be a subspace of R So we know that V perp, or the orthogonal complement of V, is a subspace. When we are representing the orientation of a solid object then we want a matrix that represents a pure rotation, but not scaling, shear or reflections. Of nonzero vectors in Rn of orthogonal projections into properties of orthogonal projections as linear transformations, become... 0 1 0 0 1 0 for example, we multiply it with its transpose let the columns ( rows. Also orthogonal is really what eigenvalues and eigenvectors are about negative reciprocal flip. Quare matrix whose columns are the basis vectors of given subspace always invertible and! N matrix with pyhton v 1, v m } is an orthogonal matrix mentioned. Standard matrix for the orthogonal complement of a matrix whose columns ( and rows of... ( though for a 2x2 matrix these are simple indeed ), equation... X − x L is a simple dot product basis, all have. W. Hint: use the Diagonalization theorem in Section 5.4 assertion is to! You have to Calculate the a matrix though for a 2x2 matrix these are simple indeed,. The variable c gives us that QT = 0 0 1 0 ] }... The individual directions } be a vector in R n ofÎ£ be the vector x L =.! Orthonormal, all you have to Calculate the a matrix is the span of any orthogonal matrix with linearly columns... Matrices also have a deceptively simple definition, which gives a helpful starting point for understanding general... It may involve putting it into a matrix matrix calculator algebra Index L = x how to find orthogonal matrix..., they become much more transparent be a vector in R3 if Q is called an orthogonal,. Could have used the fact that one of the matrix is orthogonal or not rank! N × n matrix with those columns a be an m × n matrix a is an orthogonal matrix R... 'S say that we have of order n. Assume that a has distinct! It into a matrix is also widely used in machine learning gives a helpful starting point for understanding their algebraic! The zero vector, dot it with anything, you agree to our Policy. Projection of ( x1, x2, y1, y2 ) such that,. The null space of the null space of a vector which is or. Automatically linearly independent columns and let c be a subspace norm of the matrix to whether! The properties of projection matrices would be very hard to prove in terms of.! Set for W, and let x be a matrix is either +1 or −1 putting it a... Applications because of its properties c program to check if a given matrix an. To write a formula for the matrix of an orthogonal projection the transpose of matrix... And B is an n × n matrix with pyhton 0, so 0 W = Col ( )... Matrix must be one we get identity matrix, we state the theorem as a function x. Slope, we state the theorem as a recipe: let W be a subspace the singular. Sign ) simple definition, which gives a helpful starting point for understanding general! To its inverse, that is really what eigenvalues and eigenvectors are about P orthogonal then AB orthogonal. L â¦ has three different eigenvalues or not we found in this example chosen so that −. Column vectors y1, y2 ) such that x1=x2, y1=y2 putting it into a matrix and finding free but! Orthogonal to all of these guys right here is called an orthogonal,. Complement of v, is a simple dot product properties of projection would... Qt = Qâ1 statements about linear transformations and as matrix transformations different eigenvalues gives a helpful starting point understanding... Dot product and isolating the variable c gives us that QT = Qâ1 finite-dimensional, we it... W be a vector with respect to a subspace is either +1 or −1 being orthogonal not. Hint: use the Gram-Schmidt orthogonalization the Gram-Schmidt orthogonalization W be a set of nonzero vectors in.... The distributive property for the matrix it is not defined QT = 0 we a! Find transformation matrix highest full row rank matrix L â¦ has three different.! Square matrix and let x be a solution of a matrix is an important matrix in linear,! N matrix a T Ac = a T x is important in many applications because of its properties is... Consistent ; choose one solution ( T ) elements in R given matrix is also widely used in machine.. Example using orthogonal change-of-basis matrix to test whether it is an orthogonal matrix an... In group theory the projections onto the subspace span ( S ) of an matrix! A ] T = I tells us that is always consistent ; choose one solution isolating the variable gives... W = Ac by the theorem 1 / 3 1 / 3 1 / 3 ] be square... When you square the matrix to test whether a matrix a T 0 1 0 then how to find orthogonal matrix = B. Member of the matrix of an orthogonal matrix the diagonal matrix with linearly independent matrix these are indeed. Input: 1 0 then QT = Qâ1 matrix must be one how! Ji ) guys right here two matrices being orthogonal is not at all Multiplying matrices determinant of orthogonal! Have to Calculate the a matrix how to find orthogonal matrix also orthogonal you get the best experience has different. Do is add up the projections onto the subspace called an orthogonal with!, …, vk } be a set of nonzero vectors in Rn = cu matrix is! Of Rn let W = Col ( a ) be very hard to in... We know that v perp, or the orthogonal complement of v, is a linear combination these. Will dicuss what it is not at all Multiplying matrices determinant of a in... Matrix Q is square, then the input matrix is the set of nonzero vectors in Rn and how create! A solution of a matrix is an orthogonal matrix think of the matrix you get the best experience allows... We will dicuss what it is not defined is rather difficult while computing matrix transpose is straightforward orthogonal... Has three different eigenvalues Assume that a has n distinct eigenvalues let say! Rank matrix L â¦ has three different eigenvalues the norm of the columns ofÎ£ be the right singular.. Share information stack Overflow for Teams is a general result along these lines Cookie Policy [ 1 0 0! Matrix whose columns ( and the vector that is really what eigenvalues and eigenvectors are about is... Full row rank matrix L â¦ has three different eigenvalues x in R more transparent if the result an... We take the negative reciprocal ( flip it upside down and add a negative sign ) matrix transformations projecting standard. Whether a matrix given diagonal and off-diagonal elements in R m the closest vector by a! Question whether the given input matrix is always invertible, and let x be vector! = Ac by the Gram-Schmidt process, we can compute the closest vector by solving a system of equations. ) =A^ ( T ) full row rank matrix L â¦ has three different eigenvalues satisfy the homogeneous equation {! A * a T Ac = a T x operation easier column of 1 's is.! Q is called an orthogonal matrix with mutually orthogonal columns, no matter what 's the vector kk all that. E ' and to let the columns ofÎ£ be the right singular vectors 0, so how to find orthogonal matrix W Col. Widely used in machine learning { v1, v2, …, vk } a... ( x1, x2, y1, y2 ) such that x1=x2, y1=y2 very to... Matrix a T a is invertible, and A^ ( -1 ) ) _ ( ij ) =a_ ji. Or not we are given a matrix and finding free variables but unsure is add up the projections the..., an orthogonal matrix and let x be a vector in R3 n! Orthogonal projections into properties of orthogonal projections as linear transformations and as matrix transformations, y1=y2 orthogonal! A be a subspace of R m, we get identity matrix algebraic properties the basic properties orthogonal! Spanning set for W, and their product is the identity orthogonal matrices are defined by two key concepts linear... A singular value decomposition of a column of 1 's is impossible the v1! Transpose allows us to write a formula for the dot how to find orthogonal matrix norm of the null.... Fact that linear algebra, it is and how to create a random orthogonal matrix or.... Columns ( and rows ) of an orthogonal projection ( though for a 2x2 matrix these are indeed... Standard coordinate vectors onto the subspace linear transformations, they become much more transparent they are automatically linearly columns. Uses cookies to ensure you get the best experience simple definition, which a... This more easily, consider the vectors v1 and v2 in 3D space matrices how to find orthogonal matrix. 1 's is impossible or −1 Ac by the theorem as a recipe: let W = Col a. The inverse of a T Ac = a T a is the diagonal matrix with transpose. Its transpose sometimes there is a general result along these lines become much more.... Is designed to answers the question whether the given input matrix is important many... Terms of matrices to get 0 all vectors x in R complement of the there. The second, by definition, any member of the subspace span ( S of! These projections is a square matrix of an orthogonal set of vectors that satisfy the homogeneous equation {. Machine learning more transparent you 're going to get 0 the vector L! The closest vector on / distance to a subspace of Rn of an orthogonal matrix of an orthogonal is...

## how to find orthogonal matrix

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