Why does arrow fail? (R2015a)

2015 7 22
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更新时间：2015 7 22
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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);

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Star Strider
Star Strider 2015-7-22
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.

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Mike Garrity
Mike Garrity 2015-7-22

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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])

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Eric
Eric 2015-7-22
编辑：Eric 2015-7-22

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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

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