dec2bin convert from decimal to binary

## Syntax

                str = dec2bin(x)
                str = dec2bin(x,n)

## Arguments

x

  matrix of doubles, positive integer values

n

  a positive integer

str

  a matrix of strings

## Description

Given `x`, a positive (or a vector/matrix of integers) integer, this function returns a string (or a column vector of strings) which is the binary representation of `x.` If dimension of `x` is superior than 1 then each component of the column vector `str` is the binary representation of the `x` components (i.e `str(i)` is the binary representation of `x(i)`).

If the components length of `str` is less than `n` ( i.e length str(i) < n ), then add to `str` components the characters '0' on the left in order to have components length equal to `n.`

## Examples

    // example 1 :
    x=86;
    str=dec2bin(x)

    // example 2 :
    // The binary representation of 86 is: '1010110'.
    // Its length is 7 (less than n).
    // We add to str 8 times the character '0' (on the left).
    x=86;
    n=15;
    str=dec2bin(x,n)

    // example 3 :
    x=[12;45;135]
    z=dec2bin(x)

## See also

- bitstring
- dec2base
- dec2oct
- dec2hex
- bin2dec