Matlab coder cannot find knnSearch function

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Michael Sorocky
Michael Sorocky 2023-6-28
回答： Udit06 2024-11-11，8:15
Hello,
I am trying to convert a Matlab function to C code. Part of this function uses the built-in pcregisterloam() function; it runs successfully in Matlab. However, when I try to compile it, I recieve an error related to the pcregisterloam() function stating:
"Undefined function or variable 'knnSearch'. " (see attached for a screenshot).
If I open the function knnSearch, I'm directed to the file knnsearch.m (note the lowercase "s"), so I assume the link to the proper function is broken somehow.
At the matlab terminal, running
help knnSearch
gives:
--- knnSearch not found. Showing help for knnsearch instead. --
However, running
which knnSearch
yields:
knnSearch is a built-in method % vision.internal.Kdtree method
How can I direct the coder to the proper function? Thanks in advance!

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回答（1 个）

Udit06
Udit06 2024-11-11，8:15
Ran in:
Hi Michael,
I was facing a similar issue in MATLAB R2023a. However, I was able to generate the C code in MATLAB R2024a. So, you can consider updating to a latest version of MATLAB to resolve the issue.
Running "which" command with an inbuild function appears to be case insensitive. I tried running the following command to verify that the results corresponds to case insensitive search:
which PLOT
/MATLAB/toolbox/matlab/bigdata/@tall/plot.m % tall method
So, in your case, there is no method with the name "knnSearch". The correct method name is "knnsearch".
I hope this helps.

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