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function D = pdist2( X, Y, metric ) ↑ Error: Function definition not supported in this context. Create functions in code file.

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uma
uma 2020-4-2
回答： Walter Roberson 2020-4-2
function D = pdist2( mX,mY, metric )
if( nargin<3 || isempty(metric) ); metric=0; end;
switch metric
case {0,'sqeuclidean'}
D = distEucSq( X, Y );
case 'euclidean'
D = sqrt(distEucSq( mX, mY ));
case 'L1'
D = distL1( mX, mY );
case 'cosine'
D = distCosine( mX, mY );
case 'emd'
D = distEmd( mX, mY );
case 'chisq'
D = distChiSq( mX, mY );
otherwise
error(['pdist2 - unknown metric: ' metric]);
end

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Walter Roberson
Walter Roberson 2020-4-2
You cannot copy and paste that into the command line. You would need to store it in a file named pdist2.m
You will also need to define distEucSq and other related functions.
That code appears to be part of Piotr's "Classify Toolbox". You should install that https://github.com/pdollar/toolbox or you can probably get it from the Add-Ins Manager; https://www.mathworks.com/matlabcentral/fileexchange/56689-pdollar-toolbox

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