Description
Consider the matrix
(1)The rows of A form a basis for $\mathbb{R}^3$, but not an orthogonal basis. We can use the rows of $A$ to generate an orthogonal basis using the gram_schmidt() method. The method returns a tuple containing two matrices $G$ and $M$: G is a matrix where each row is an element in the orthogonal set generated by the process, and M is a matrix where each row is the coefficients of the linear combination of the rows of the first matrix to generate the corresponding row in $A$. In other words, $MG = A$
Sage Cell
Code
A = matrix(QQ, [[1, 2, 3], [4, 5, 6], [7, 8, 10]])
A.gram_schmidt()Options
Creating an Orthonormal Basis
The method has an option for creating an orthonormal basis instead of a simply orthogonal one. To accomplish this, we simply set the orthonormal argument to True when calling the method. Since this procedure usually involves irrational square roots, we'll define the matrix $A$ to be over RDF, Sage's double precision real number field.
Code
A = matrix(RDF, [[1, 2, 3], [4, 5, 6], [7, 8, 10]])
A.gram_schmidt(orthonormal=True)Tags
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Date: 12 Jun 2020 17:16
Submitted by: Zane Corbiere