fprintfMat writes a matrix in a file

## Syntax

    fprintfMat(file, M [,format,text])

## Arguments

file

  a string, the pathname of the file to be written

M

  a matrix of real numbers

format

  a character string giving the format. This is an optional parameter, the default value is `"%lf"`.

  Supported format: `%[width].[precision]type` or `%type`, where:

  `width`: an optional number that specifies the minimum number of characters output;

  `precision`: an optional number that specifies the maximum number of characters printed for all or part of the output field, or the minimum number of digits printed for integer values;

  `type`: lf, lg, d, i, e, f, g (see scanf_conversion for details).

text

  a row (column) vector of strings giving non numerical comments stored at the beginning of the file.

## Description

The `fprintfMat` function writes a matrix in a formatted file. Each row of the matrix give a line in the file. If `text` is given then the elements of `text` are inserted elementwise at the beginning of the file one element per line.

## Examples

    n = 50;
    a = rand(n, n, "u");
    fprintfMat(TMPDIR + "/Mat", a, "%5.2f");
    a1 = fscanfMat(TMPDIR + "/Mat");

    // Lets we create a file Mat1 and insert a comment into it
    some_comment = ["This is a comment","This the second line of the comment.","This is the third line of the comment."];
    fprintfMat(TMPDIR + "/Mat1", a, "%5.2f",some_comment);

## See also

- scanf_conversion
- mclose
- meof
- mfprintf
- mfscanf
- fscanfMat
- mget
- mgetstr
- mopen
- mprintf
- mput
- mputstr
- mscanf
- mseek
- mtell
- mdelete