how to call a function

sir i have written this program i want to know that how can i call the function in the loop... clc; clear all; B=imread('bulb.jpg');

A=imresize(B,[128 128]);

[a b]=size(A);

c=8; d=8; l=0;

for i=1:c:a-7 for j=1:d:b-7

        C = A((i:i+7) ,( j:j+7));
        eval(['out_' num2str(l) '=C'])
        l=l+1;
        DCT= dct2(C)
        quant = [
 16  11  10  16  24   40   51   61;
 12  12  14  19  26   58   60   55;
 14  13  16  24  40   57   69   56;
 14  17  22  29  51   87   80   62;
 18  22  37  56  68   109  103  77;
 24  35  55  64  81   104  113  92;
 49  64  78  87  103  121  120  101;
 72  92  95  98  112  100  103  99
    ];

quantCoef = round(DCT ./ quant)

    end
end

     function output=rle2(Input);

L=length(Input); j=1; k=1; i=1; while i<2*L comp=1; for j=j:L if j==L break end; if Input(j)==Input(j+1) comp=comp+1; else break end; end; Output(k+1)=comp; Output(k)=Input(j); if j==L && Input(j-1)==Input(j) break end; i=i+1; k=k+2; j=j+1; if j==L if mod(L,2)==0 Output(k+1)=1; Output(k)=Input(j); else Output(k+1)=1; Output(k)=Input(j); end; break end; end;

Answer 1

[Mischa Kim]

Jitesh, I assume you are referring to the function rle2? If so, turn the preceding script into a function (I called it mymain) and simply call the function with the appropriate input arguments. The m-file should be named like the main function, in this case mymain.m.

 function mymain()
   ...
   for i=1:c:a-7
      ...
      out = rle2(in);   % in needs to be assigned at this point
      ...
   end
 end

 function output = rle2(Input)
   ...
   output = ...         % return value of the function
 end

[Jitesh Bhanushali]

sir i have wrote as

function mymain() clc; clear all;

B=imread('bulb.jpg');

A=imresize(B,[128 128]);

[a b]=size(A);

c=8; d=8; l=0;

for i=1:c:a-7 for j=1:d:b-7

        C = A((i:i+7) ,( j:j+7));
        eval(['out_' num2str(l) '=C'])
        l=l+1;
        DCT = dct2(C)
        quant = [
 16  11  10  16  24   40   51   61;
 12  12  14  19  26   58   60   55;
 14  13  16  24  40   57   69   56;
 14  17  22  29  51   87   80   62;
 18  22  37  56  68   109  103  77;
 24  35  55  64  81   104  113  92;
 49  64  78  87  103  121  120  101;
 72  92  95  98  112  100  103  99
    ];

quantCoef = round(DCT ./ quant) out=rle2(quantCoef); end end

     function output=rle2(Input)

L=length(Input); j=1; k=1; i=1; while i<2*L comp=1; for j=j:L if j==L break end; if Input(j)==Input(j+1) comp=comp+1; else break end; end; Output(k+1)=comp; Output(k)=Input(j); if j==L && Input(j-1)==Input(j) break end; i=i+1; k=k+2; j=j+1; if j==L if mod(L,2)==0 Output(k+1)=1; Output(k)=Input(j); else Output(k+1)=1; Output(k)=Input(j); end; break end; end; end; end;

but it gives error as

This statement is not inside any function. (It follows the END that terminates the definition of the function "mymain".)

what should i do..please help

[Mischa Kim]

What is the exact error msg? Also, please format the code or attach it to your question (see paper clip icon).

[Jitesh Bhanushali]

the error is about the the "end" of the function

[Mischa Kim]

A couple of things:

• Remove all the semi-colons after the end statements.
• Remove the very last end statement and add one right before the function definition for rle2.
• Change output to Output (variable names are case-sensitive) in the function definition for rle2.

See attachment below.

[Jitesh Bhanushali]

sir , i tried to run this mymain.m but i got RLE of the only first column of the matrix..can i get whole matrix using IRLE and this RLE output??

Answer 2

[Jitesh Bhanushali]

how to end the function//

Answer 3

[Jitesh Bhanushali]

i got error as

??? Attempt to add "out_0" to a static workspace. See MATLAB Programming, Restrictions on Assigning to Variables for details.

Error in ==> mymain at 20 eval(['out_' num2str(l) '=C'])

Answer 4

[Jitesh Bhanushali]

file attached

[Mischa Kim]

I added the final comments and a working m-file above with my previous comment.

Please add follow-up questions and comments as comments, not answers.