Why does arrow fail? (R2015a)

A simple call to arrow fails on 2015a with:

Undefined operator '*' for input arguments of type 'matlab.graphics.axis.Axes'.

Error in arrow (line 423)
ax = o * gca;

Where on line 412: o = ones(narrows,1);

[Star Strider]

I assume you’re not using the annotation 'arrow' function.

If arrow is a FEX submission, note that HG2 ‘broke’ many FEX files that used the more flexible HG1 functionality. If they are not updated to be compatible with HG2 (and I suspect many cannot be), you have to use them with R2014a or earlier.

Answer 1

[Mike Garrity]

I'm not sure what "arrow" is, but that code fragment looks like it's trying to create a vector which holds "narrows" copies of the handle of the current axes. A much more reliable way of doing that would be something like:

ax = repmat(gca,[narrows 1])

Answer 2

[Eric]

Thanks! My bad...I thought arrow() was a part of MATLAB distribution. Rather, it's from the MATLAB File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/278-arrow-m ... which explains why it broke ;-)

Based on the comments provided there, I was able to make the necessary modifications to arrow.m so that it works on R2015a.

/eric