postplot and postanimate nothing to plot error

I have attached a .fea of an example problem postplotProblem.fea. Using the GUI I can plot the results and view the animation. Instead of using the GUI I would like to use the postplot() and postanimate() functions, because I want to change the caxis setting to fixed values instead of auto. From the documentation it isn't clear if I'm supposed to provide a string or a vector so:

postplot(fea,'caxis',[55 500]) vs postplot(fea,'caxis','[55 500]')

However regardless of of whether I provide a string or a vector I always get the following error:

Error using featool
Nothing to plot.

Error in featool

Error in featool

Error in featool

Error in postplot (line 70)
[varargout{:}] = featool( 'feval', 'postplot', varargin{:} );
 

I also get this for any value pair that I try, for example:

postplot(fea,'solnum',9)

If I call postplot(fea) a new figure is created with the default settings.
If I call postanimate(fea) I just get the nothing to plot error again.

I'm sure I am missing something totally obvious.

As always thank you for your help,

Matt

You don't seem to actually plot anything, you need to actually assign a plot of some sort (surface, arrow, isocontour etc). If you just call "postplot(fea)" FEATool doesn't know what you want to visualize.

Yep. That was the simple thing I was missing. I keep forgetting that I can export an m-file for almost anything. Anytime I try to use a function for the first time I should do it with the GUI to see an example!

Thanks for the quick reply,

Matt