How can I convert following script to function?

Hi all,

I am having trouble converting following script to function. Function need to have xxx(image,factor). My script is below.

a=imread('cameraman.tif');
[m n] = size(a);
p = 2;

for i=1:m %loop to extract every row
      for j=1:n %loop to extract every column
          for k=1:p %loop to control the number of replication
              b(i,(j-1)*p+k)=a(i,j); %replication pf pixels in row wise 
          end
      end
end

c=b;
[m n]=size(c);

for i=1:n %loop to extract every column
      for j=1:m %loop to extract every row
          for k=1:p %loop to control the number of replication
               b((j-1)*p+k,i)=c(j,i); %replication pf pixels in row wise
          end
    end
end 

imshow (a), title('Original Image')
figure, imshow(b), title('Resized Image')
xlabel(sprintf('Resizing factor is %g', p))

Answer 1

[Al Dente]

function xxx(image,p)
  a=imread(image);

    [m n] = size(a);

    % remove this line p = 2;

if you don't want to change much of your code then take the above function header I guess, where image is the image you want to use.

[Sel]

Hi,

Thanks for your answer. I dont want to change the code so much and when I do that I am getting

Undefined function 'xxx' for input arguments of type 'char'. Code is below..

function x = xxx(image, p)

a = imread(image);

[m n] = size(a);

for i=1:m %loop to extract every row for j=1:n %loop to extract every column for k=1:p %loop to control the number of replication b(i,(j-1)*p+k)=a(i,j); %replication pf pixels in row wise end end end

c=b; [m n]=size(c); for i=1:n %loop to extract every column for j=1:m %loop to extract every row for k=1:p %loop to control the number of replication b((j-1)*p+k,i)=c(j,i); %replication pf pixels in row wise end end end

imshow (x), title('Original Image') figure, imshow(b), title('Resized Image') xlabel(sprintf('Resizing factor is %g', p)) end

[Al Dente]

did you put your entire code in an m file and save it? does the m file exist in matlab path? -- the file name must be xxx.m in this case

[Al Dente]

function xxx(image,p)
a=imread(image);
[m n] = size(a);

%p = 2;
for i=1:m %loop to extract every row
      for j=1:n %loop to extract every column
          for k=1:p %loop to control the number of replication
              b(i,(j-1)*p+k)=a(i,j); %replication pf pixels in row wise
          end
      end
end

c=b;
[m n]=size(c);
for i=1:n %loop to extract every column
    for j=1:m %loop to extract every row
       for k=1:p %loop to control the number of replication
           b((j-1)*p+k,i)=c(j,i); %replication pf pixels in row wise
       end
    end
end

imshow (a), title('Original Image')
figure, imshow(b), title('Resized Image')
xlabel(sprintf('Resizing factor is %g', p))
end

this should be your code basically, put that in a new m file and save it as xxx.m and make sure to have it in your matlab path -- see addpath.

then you can xxx('cameraman.tif', 2) -- 'cameraman.tif' has to be in your matlab path as well, if not then use the entire path --> 'c:\foo\bar\cameraman.tif'