xs2ppm export graphics to PPM

## Syntax

                xs2ppm(win_num, file_name)
                xs2ppm(fig, file_name)

## Arguments

win_num

  an integer, ID of the figure to export.

fig

  handle of the figure to export.

file_name

  a string, name of the exported file.

## Description

`xs2ppm` exports the display of a graphic window into a PPM file.

## License

The code of PPM is based on the work of Jef Poskanzer (Copyright (C)1996,1998) All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

## Examples

    scf(0)
    plot2d()
    //PPM export
    filename='foo.ppm';
    xs2ppm(0,filename);

## See also

- toprint
- printfigure
- xs2bmp
- xs2gif
- xs2jpg
- xs2png
- xs2eps
- xs2pdf
- xs2svg
- xs2ps
- xs2emf