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

unrecognized fuction or variable x

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

Best Answer

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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