imult multiplication by i the imaginary unitary

## Syntax

    y = imult(x)

## Arguments

x

  real or complex scalar, vector or matrix

y

  complex scalar, vector or matrix

## Description

`imult(x)` is a more efficient way to multiply `x` by `i` than `y = %i*x`, without the problems occurring when `x` comprises "special" floating point numbers as `%inf` and `%nan`.

## Examples

    z1 = imult(%inf)
    z2 = %i * %inf