QR decomposition (for TI compatibility)

The QR command finds the QR decomposition of a matrix.

QR takes three arguments:
- A, a square matrix.
- q and r, two variable names.
QR(A,q,r) returns the matrix R from the QR decomposition of A, and assigns the matrices Q and R to the variables q and r.

QR([[3,5],[4,5]],Q,R)

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5	7
0	1

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The result is the matrix R. To obtain Q:

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