xs2pdf export graphics to PDF.

## Syntax

                xs2pdf(win_num, file_name [,orientation])
                xs2pdf(fig, file_name [,orientation])

## 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.

  If the extension is not provided, it is going to be automatically added.

orientation

  an optional string, with possible values `'portrait'` or `'landscape'`. The default value is `'portrait'`.

## Description

`xs2pdf` exports the display of a graphic window into an PDF file.

## Examples

    scf(0);
    plot2d();
    //PDF export
    filename='foo';
    xs2pdf(0,filename);
    xs2pdf(gcf(),filename);

## See also

- `figure_size` property in figure_properties
- toprint
- printfigure
- xs2bmp
- xs2gif
- xs2jpg
- xs2png
- xs2ppm
- xs2eps
- xs2svg
- xs2ps
- xs2emf