bitcmp bitwise complement

## Syntax

                y = bitcmp(x)
                y = bitcmp(x, bitnum)

## Parameters

x :

  a `m`-by-`n` matrix of doubles or a `m1`-by-`m2`-by-...-by-`mm` hypermatrix of doubles or a `m`-by-`n` matrix of unsigned integers (`uint8`, `uint16` or `uint32`). Must contain positive integer values.

bitnum :

  a `m`-by-`n` matrix of doubles or a `m1`-by-`m2`-by-...-by-`mm` hypermatrix of doubles or a `m`-by-`n` matrix of unsigned integers (`uint8`, `uint16` or `uint32`). The input `n` must be in the range 1, 2, ..., `bitmax` where `bitmax` is the maximum number of bits in `x`. `bitnum` must contain positive integer values. The default value for `bitnum` is `bitmax`.

y :

  a `m`-by-`n` matrix of doubles or a `m1`-by-`m2`-by-...-by-`mm` hypermatrix of doubles or a `m`-by-`n` matrix of unsigned integers.

## Description

Given an unsigned integer `x`, this function returns the unsigned integer `y` which is the integer corresponding to the complementary of the binary form of `x`.

The integer `bitnum` sets the maximum number of bits.

If the bits number of the `x` binary representation is less than the `bitmax` number (8,16 or 32) then the bits `'1'` are added to the complementary in order to have `bitmax` number (8, 16 or 32) for the complementary.

If only one input argument is given, `x` must be a matrix of unsigned integers.

## Examples

    // 13 is (1101)_2
    // We insert zeros in the beginning to get a 8-bit number:
    // (00001101)_2
    // The 8-bits complement is then (11110010)_2
    // which is 242
    bitcmp(13,8)
    expected = 242

    // The input argument can be an unsigned int
    bitcmp(uint8(99),8)
    expected = 156