when i used embedded matlab function for performng following code i got the error message.Here input 'Edge' from a sobel filter block,output is y

error:1)Colon operands must be all the same type, or mixed with real scalar doubles.

Function 'Embedded MATLAB Function' (#18.178.181), line 10, column 11: "imx" 2)Subscripting into an mxArray is not supported.

Function 'Embedded MATLAB Function' (#18.212.219), line 12, column 13: "Lp(i,j)" 3)Undefined function or variable 'p'. The first assignment to a local variable determines its class.

Function 'Embedded MATLAB Function' (#18.241.242), line 13, column 19: "p"

code:

function y = fcn(Edge)
eml.extrinsic('bwlabel')
[Lp,num] = bwlabel(Edge);
mx=max(max(Lp));
[px,py]=size(Edge);
[imx,imy]=size(Lp);
k=0;
for l=1:1:num
    k=k+1;p(k)=0;
for i=1:1:imx
    for j=1:1:imy
         if Lp(i,j)==l
             p(k)=p(k)+1;

           end
      end
  end 
  end
  q=p;
  temp=0;
  for i=1:1:k
      for j=1:1:k-1
  if p(j)>p(j+1)
      temp=p(j);
      p(j)=p(j+1);
      p(j+1)=temp;
  end
      end
  end
  y=p(k);

Answer 1

[Kaustubha Govind]

Since 'bwlabel' is declared as an extrinsic function and is unsupported for code-generation, the block is unable to analyze what the type and size of its outputs Lp and num are. If you pre-define their values with the expected type and size, the error should go away. For example, before calling bwlabel, you may write these lines:

    Lp = zeros(size(Edge));
    num = 0;

[aju]

Thanx for ur answer.,when i had done what u said,following error message appeared. Embedded MATLAB Interface Error: Simulation stopped due to out of bounds error. Block Embedded MATLAB Function (#19) While executing: none

[Kaustubha Govind]

You may want to set breakpoints in your code to see where the "Out of bounds" error occurs. Since you are indexing into a lot of variables, it is hard to tell where you're going wrong.