First time here? Check out the FAQ!

Revision history [back]

How to convert Gram matrix to quadratic form?

How to do the opposite? Given gm, how to compute coefficients of quadratic form qf?

qf=QuadraticForm(ZZ, 4, [4, -12, 8, -4, 12, -16, 8, 6, -6, 2])
gm=qf.Gram_matrix()
gm

[ 4 -6  4 -2]
[-6 12 -8  4]
[ 4 -8  6 -3]
[-2  4 -3  2]

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.