number_bin2hex — Converts a binary string into a hexadecimal string.
binstr = number_bin2hexary ( hexstr )
a matrix of strings. Each entry of the matrix must have length divisible by 4.
a matrix of strings.
Returns the binary string corresponding to the given hexadecimal string. Returns upper case letter. Use convstr to change this to lower case.
The user may pad the binary string with additionnal "0" if necessary.