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numbas / Numbas

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An "is scalar multiple of x" function for vectors and matrices

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christianp
christianp commented Jan 5, 2021

This would be a nice function to have, instead of having to rewrite it each time I write a question that needs it.

u is a scalar multiple of v if there is a scalar k such that u = k*v. You could find this k by computing the ratio u_i / v_i for each non-zero component i, then check that the ratios are all equal. This should work similarly to isclose, allowing given relative and a

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