how to store value from loop

Question

sazzad hossen 2014-5-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131197-how-to-store-value-from-loop

评论： sazzad hossen 2014-5-27

for i=1:0.1:5

    ly=i;
    for j=1:0.1:5;
    lx=j;
    c1=co1(x1,y1,z1,lx,ly,lz,f);
    c2=co2(x2,y2,z1,lx,ly,lz,f);
    c3=co3(x3,y3,z1,lx,ly,lz,f);
    %options = optimoptions('fsolve','Display','iter');
    func = @(x)efunction(x,x1,x2,x3,y1,y2,y3,c1,c2,c3,f);
    [x,fval] = fsolve(func,x0);
    X=x(1,1);
    Y=x(1,2);
    H=x(1,3);
    x_error= sprintf('%.10f',abs(X-lx));
    y_error=sprintf('%.10f',abs(Y-ly));
    z_error=sprintf('%.10f',abs((z1-H)-lz));

end

problem : i just get only one value in each parameter of x_error, y_error, z_error

but i want to get/store all value of x_error, y_error and z_error

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Answer 1

rifat 2014-5-27

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Your index isnt integer.. Use the following modification. And your program isnt self sufficient for me to execute.

    idx = 0;
    for i=1:0.1:5 
        ly=i;
        idx=idx+1;
        idy=0;
        for j=1:0.1:5;
            idy=idy+1;
            lx=j;
            c1=co1(x1,y1,z1,lx,ly,lz,f);
            c2=co2(x2,y2,z1,lx,ly,lz,f);
            c3=co3(x3,y3,z1,lx,ly,lz,f);
            %options = optimoptions('fsolve','Display','iter');
            func = @(x)efunction(x,x1,x2,x3,y1,y2,y3,c1,c2,c3,f);
            [x,fval] = fsolve(func,x0);
            X=x(1,1);
            Y=x(1,2);
            H=x(1,3);
            x_error{idx,idy}= sprintf('%.10f',abs(X-lx));
            y_error{idx,idy}=sprintf('%.10f',abs(Y-ly));
            z_error{idx,idy}=sprintf('%.10f',abs((z1-H)-lz));
        end
    end

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sazzad hossen 2014-5-27

thanks for your help

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Answer 2

Sara 2014-5-26

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Define a cell array before the loop:

x_error = cell(50,50); % Adjust num elements according to your loops

and then do:

x_error{i,j} = ....

The same for the other variables.

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sazzad hossen 2014-5-27

在 MATLAB Online 中打开

it's not wotk

   x_error = cell(1681,1); %  because of two loop 41*41=1681
   x_error = cell(1681,1);
   x_error = cell(1681,1);

for i=1:0.1:5 ly=i;

    for j=1:0.1:5;
    lx=j;
    c1=co1(x1,y1,z1,lx,ly,lz,f);
    c2=co2(x2,y2,z1,lx,ly,lz,f);
    c3=co3(x3,y3,z1,lx,ly,lz,f);
    %options = optimoptions('fsolve','Display','iter');
    func = @(x)efunction(x,x1,x2,x3,y1,y2,y3,c1,c2,c3,f);
    [x,fval] = fsolve(func,x0);
    X=x(1,1);
    Y=x(1,2);
    H=x(1,3);
    x_error{i,j}= sprintf('%.10f',abs(X-lx));
    y_error{i,j}=sprintf('%.10f',abs(Y-ly));
    z_error{i,j}=sprintf('%.10f',abs((z1-H)-lz));