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XLIM Adjust X Axis limits of plot

Section: Handle-Based Graphics

# Usage

There are several ways to use `xlim` to adjust the X axis limits of a plot. The various syntaxes are

       xlim
       xlim([lo,hi])
       xlim('auto')
       xlim('manual')
       xlim('mode')
       xlim(handle,...)

The first form (without arguments), returns a 2-vector containing the current limits. The second form sets the limits on the plot to `[lo,hi]`. The third and fourth form set the mode for the limit to `auto` and `manual` respectively. In `auto` mode, FreeMat chooses the range for the axis automatically. The `xlim('mode')` form returns the current mode for the axis (either `'auto'` or `'manual'`). Finally, you can specify the handle of an axis to manipulate instead of using the current one.

As an additional feature, you can now specify `inf` for a limit, and FreeMat will take that limit from the automatic set. So, for example `xlim([10,inf])` will set the minimum for the x axis, but use the automatic value for the maximum.

# Example

    --> x = linspace(-1,1);
    --> y = sin(2*pi*x);
    --> plot(x,y,'r-');
    --> xlim  % what are the current limits?

    ans =
     -1  1

which results in

Next, we zoom in on the plot using the `xlim` function

    --> plot(x,y,'r-')
    --> xlim([-0.2,0.2])

which results in

To demonstrate the infinite limits feature. Consider the following

    --> plot(x,y,'r-');
    --> xlim([0,inf])

which results in