whats wrong with the code

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777 2012-4-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34165-whats-wrong-with-the-code

this is the code to calculate itakura saito distance between two psd. ans should be d but d contains all elements as NaN plss help

[nf1,p2]=size(pf1); 
p1=p2-1;
nf2=size(pf2,1);
if nargin<3 | isempty(mode)
  mode='0';
end
if any(mode=='d') | (mode~='x' & nf1==nf2)
  nx=min(nf1,nf2);
  r=pf1(1:nx,:)./pf2(1:nx,:);
  q=log(r);
  d=log((sum(r(:,2:p1),2)+0.5 * ...
      (r(:,1)+r(:,p2)))/p1)-(sum(q(:,2:p1),2)+0.5* ...
      (q(:,1)+q(:,p2)))/p1;
else
  r=permute(pf1(:,:,ones(1,nf2)),[1 3 2])./permute(pf2(:,:,ones(1,nf1)),[3 1 2]);
  q=log(r);
  d=log((sum(r(:,:,2:p1),3)+0.5 * ...
      (r(:,:,1)+r(:,:,p2)))/p1)-(sum(q(:,:,2:p1),3)+0.5* ...
      (q(:,:,1)+q(:,:,p2)))/p1;
end

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Jan 2012-4-1

Please learn how to format the code by reading the "Markup help" link on this page.

Fine. This is the thousands time I've written this suggestion.

Jan 2012-4-1

You forgot to post some meaningful input values. pf1, pf2, mode?!

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Answer 1

Image Analyst 2012-4-1

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https://ww2.mathworks.cn/matlabcentral/answers/34165-whats-wrong-with-the-code#answer_42850

在 MATLAB Online 中打开

Just taking a stab in the dark (because I have no idea what this code does), I set

pf1 = rand(10);
pf2 = rand(10);
% And because mode is a reserved function 
% that you don't want to override, 
% I changed mode to myMode:
myMode = 'x';

and it ran fine with d NOT being all nans.

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whats wrong with the code

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