[Octave-bug-tracker] [bug #45496] "error: no default value for argument" fails to give function/line number/etc

[Nick Jankowski]

Follow-up Comment #2, bug #45496 (project octave):

> what is that supposed to do? 

I didn't realize Octave supported this, but apparently a : as a function input
is a placeholder for whatever default value is specified in the function
definition. 

For me, it was a typo. Since the error wasn't reporting tho stack trace, it
took me a bit to find the source of the error. 
 It was buried in a function I wrote to do a fast matrix multiply between
arrays of 2x2 matrices. (attached)

I had misordered by inputs to the calling function, so instead of getting two
arrays to multiply, it was passed an array and a function handle instead. 

You can see in the attached file, it rolls out the matrix multiply, calling
each element by A(1,1,:), etc.  So, since it saw A as a function handle, it
got rightly confused. 

legitimate error. no stack trace. :)

(file #34399)
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File name: twobytwoarraymult.m            Size:0 KB


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