multiplication by i the imaginary unitary
y=imult(x)
:x real or complex scalar, vector or matrix : :y complex scalar, vector or matrix :
imult(x) is a more efficient way to multiply x by i than y = %i*x, without the problems occuring when x comprises “special” floating point numbers as %inf and %nan.
z1 = imult(%inf)
z2 = %i * %inf