MATLAB: Can recognize what distance is this

euclidean distance

Can anyone explain me what does this code do,

Could it be the after first if is calculated euclodean distance and in else there is second distance called mahalanobis distance ?

Best Answer

The clue is in the name of the variable: useL1Distance . If it is true, then the L1 norm is used, which is also called "taxi-cab distance".

If it is false, then the L2 norm is used, which is also called Euclidean distance.

Neither branch has anything to do with maholonobis distance.

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MATLAB: Error using zeros, Maximum variable size allowed by the program is exceeded.

The easiest way to debug this probably to type

>> dbstop if error

before running your code. Then, execute your code, and it will halt when it encounters the error, and enter debug mode. You can then investigate your variables, to see what's going on.

In your case, given the error message, I am guessing that either n or size(Test,1) is much larger than you expect. You should be able to trace back from there.

MATLAB: Error in classifying using knn classify

You use the more modern fitcknn, which is good, but you then pass the resulting model to the older knnclassify as if the model is training data. To classify your test data these days you should be using predict() on the model returned by fitcknn.

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MATLAB: Error using zeros, Maximum variable size allowed by the program is exceeded.

MATLAB: Error in classifying using knn classify

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