The maxnorm(a) function computes the maximum of the absolute values of the coefficients of a.

For complex coefficients, the maxnorm routine finds the maximum of the absolute values of the real and imaginary parts.

The maxnorm command is thread-safe as of Maple 15.

For more information on thread safety, see index/threadsafe.

$\mathrm{maxnorm}\left(x-3y\right)$

$3$

$\mathrm{maxnorm}\left(\left(3-4\mathrm{I}\right)x-3\mathrm{I}y\right)$

$4$