ZLIM Adjust Z Axis limits of plot

Section: Handle-Based Graphics

Usage

There are several ways to use `zlim` to adjust the Z axis limits of a plot. The various syntaxes are
```   zlim
zlim([lo,hi])
zlim('auto')
zlim('manual')
zlim('mode')
zlim(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 `zlim('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.

Example

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

ans =
-0.5000    0.5000
```

which results in

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

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

which results in