designFilt error ONLY inside function "Incorrect dimensions for matrix multiplication"

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Benjamin Zinszer
Benjamin Zinszer 2019-3-27
评论： Star Strider 2019-4-1
I'm using designFilt to make a simple bandpass filter for some data before doing further analysis:
myfilt = designfilt('bandpassfir','FilterOrder',20, 'CutoffFrequency1',0.1,'CutoffFrequency2',7, 'SampleRate',128);
If I run this line directly in the command window, it works just fine. (In my old scripts it worked fine too.) However, when I call it from inside a function embedded in a larger script, I get this error:
Error using designfilt>parseAndDesignFilter (line 516)
Incorrect dimensions for matrix multiplication. Check that
the number of columns in the first matrix matches the number
of rows in the second matrix. To perform elementwise
multiplication, use '.*'.
Error in designfilt (line 224)
[err,requestedResponse,parseParams,h] =
parseAndDesignFilter(inputParamValueNames, varargin{:});
The code (inserted above) is literally copy-pasted from the script, so I cannot figure out what the difference is. I've tried making sure that the "myfilt" variable is cleared each time the function is called just in case there was some problem there. It has no effect. I don't even know what to try next. Any suggestions?

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Star Strider
Star Strider 2019-3-27
Your code runs for me without error, both in a script and from inside a function the script calls. There must be something in your script file that’s interfering with it.
As a workaround, if you have R2018a or later, consider using the lowpass (link) function.
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Benjamin Zinszer
Benjamin Zinszer 2019-4-1
By the sound of things, there must be a wayward global variable in one of the [non-Mathworks] toolboxes I'm using, which is colliding with designfilt's workspace. I hadn't even considered the possibility that somebody would do that, but at least now I know what to search for! Thanks for your insights.

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