can you please explain the working of following syntax?

z=D{extrema(4*(i-1)+1)}(rx,ry,rz);

it is continuously giving 'Bad cell reference operation.' error.

extrema=zeros(1,4*number);

idx= extrema==0;

extrema(idx)=[];

extr_volume=length(extrema)/4;

for i=1:extr_volume

      x=floor((extrema(4*(i-1)+3)-1)/(n/(2^(extrema(4*(i-1)+1)-2))))+1;
      y=mod((extrema(4*(i-1)+3)-1),m/(2^(extrema(4*(i-1)+1)-2)))+1;
      rx=x+1;
      ry=y+1;
      rz=extrema(4*(i-1)+2);
      z=D{extrema(4*(i-1)+1)}(rx,ry,rz);
      size(z)
      if(abs(z)<threshold)
          extrema(4*(i-1)+4)=0;
      end
  end

Answer 1

[Star Strider]

The code you posted does not make sense. It sets ‘extrema’ to an empty array, so all references to elements of ‘extrema’ would throw errors, because they do not exist.

[Siddhesh Karbhari]

I have attached the code and that syntax is at line 153.

[Star Strider]

I cannot run the code that you attached.

I will delete my Answer in a few hours.

[Walter Roberson]

We do not have your b.jpg to test with. I copied the demo image car2.jpg to b.jpg and ran the code without difficulty.

"Bad cell reference operation" is not a MATLAB error message. Is it possible that you were running under Octave?