How to save data from for loop into cell without rewriting?

Dear all,

I have this code:

    A ={5,2};
    c = cell(size(A))
    v = 0:0.1:1
    idx = 1;
    for j = 0:0.5:1
        v(idx) = j;
        ['x-' num2str(j) '.^2+ (y- 0.5) .^2<0.1^2, ''x,'  'y,'  'z'];
        select_fcn = inline('(x-j).^2+(y-0.5).^2<0.1^2','x','y','z');
        img_2.elem_data = 1 + elem_select(img_2.fwd_model, select_fcn);
        idx = idx + 1;
        figure
        show_fem(img_2);
        vh = fwd_solve(img_1);
        vi = fwd_solve(img_2);
        img_3 = inv_solve (imdl,vh,vi);
        figure
        show_fem(img_3);
        c{k,1}=j;
        c{k,2} = idx
    end

I would like to save data (j and idx) to cell, but without rewriting. Like in my case in Comand Window:

    c = 

         []          []
         []          []
         []          []
         []          []
        [4]    [0.5000]

    c = 

         []     []
         []     []
         []     []
         []     []
        [4]    [1]

Why didn´t fill whole cell array? Why was filled only one line and still be rewritten?

I have no idea.

Thank you for any ideas.

[per isakson]

How does k get its value?

[Veronika]

This is my mistake...K has no value. I just wanted to make sure, that data (j and idx) wrote down the first and second columns. But I don´t know how to do it.

[Stephen23]

Note that you should not use i of j as your loop variables, as these are the names of the inbuilt imaginary unit .

Answer 1

[Star Strider]

You increment ‘idx’ by 1 in each iteration, so I would add one line here to define ‘k’:

          k = idx;
          c{k,1}=j;
          c{k,2} = idx;

That should solve your problem.

[Veronika]

Thank you, this solution really solve my problem.

But I have another problem - all of iteration steps are saved in one image. I would like to display function

select_fcn = inline('(x-j).^2+(y-0.5).^2<0.1^2','x','y','z');

with varying argument (j) after each iteration step to display the appropriate images.

Thank you.

[Star Strider]

My pleasure!

I do not understand what you want to do with your inline function. (There is no ‘z’ in it.)

I would replace it with the anonymous function:

select_fcn = @(x,y) (x-j).^2+(y-0.5).^2<0.1^2;

I am not certain what you mean by ‘image’, either. If you want to print out this line ['x-' num2str(j) '.^2+ (y- 0.5) .^2<0.1^2, ''x,' 'y,' 'z'] at every step,

use the fprintf function:

fprintf(1, '\t\nx-%d.^2 + (y- 0.5).^2<0.1^2, x=%f, y=%f, z=%f\n', j,x,y,z);

I have no idea what you are doing or what you want, so this is simply a guess.

[Veronika]

Thank you for your answer.

I try to explain what I mean.

I have this inline function (('(x-j).^2+(y-0.5).^2<0.1^2','x','y','z'), where j is variable (j= 0:0.5:1). So my function for example looks like (('(x-0.5).^2+(y-0.5).^2<0.1^2','x','y','z'). And I want to this function display in my figure (image = img_2) so it displays this fleck.

But in my for loop, there is something wrong, because there are all flecks in one figure (image = img_2) so it displays this

Do you have any idea?

Thank you very much for your answer.

[Star Strider]

I honestly have no idea. It would be best for you to post this as a new Question. Attach the file for the code that is producing the figure, so we can experiment with it.