arg max data type

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Mats
Mats on 13 May 2022
Commented: Steven Lord on 13 May 2022
Take the following example
x = single(-(-2:2).^2);
[xm,ix]=max(x);
whos
Name Size Bytes Class Attributes cmdout 1x33 66 char ix 1x1 8 double x 1x5 20 single xm 1x1 4 single
I think it strange that variable ix is of type double, and not integer, which would be the most logical alternative.
Anyway, I am using this kind of line for a code generation case, where double data type is banned.
Is there any way I can force max function to return an integer value for argmax (variable ix in code above)?
  1 Comment
Steven Lord
Steven Lord on 13 May 2022
I think it strange that variable ix is of type double, and not integer, which would be the most logical alternative.
I suspect that the two-output form of max predates the introduction of the integer data types to MATLAB.

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Accepted Answer

Matt J
Matt J on 13 May 2022
No, but can't you just cast it to an integer type post-facto? E.g.,
ix=cast(ix,'uint32');
  1 Comment
Mats
Mats on 13 May 2022
Hi. I did not even try this trick because I though that you cannot change the datatype of a variable when using code generation (which is generally true). However, becuase code generator is quite smart your suggestion works nicely.
Thank you Matt!

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