how to call a function

Question

Jitesh Bhanushali 2014-3-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/122569-how-to-call-a-function

评论： Jitesh Bhanushali 2014-3-24

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;

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Answer 1

Mischa Kim 2014-3-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/122569-how-to-call-a-function#answer_129561

编辑：Mischa Kim 2014-3-21

在 MATLAB Online 中打开

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

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Jitesh Bhanushali 2014-3-22

在 MATLAB Online 中打开

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 2014-3-22

编辑：Mischa Kim 2014-3-22

mymain.m

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.