Avoid overwriting of results in for loop

Hi,

I intend to save the results of function output defined inside the for loop, actually for each iteration output pushes 1 x 4 files, so, after the 10 iteration I suppose to get 10 x 4.. But somehow it overwrites, hence, I am getting only the value of last iteration.. Please help me resolve this...

output = zeros(10,4);
for f = 1:1:10
    if (f>=1) && (f<=9)
        fname_strt = 'B0000' ;
    elseif (f>=10) && (f<=99)
        fname_strt='B000';
    elseif (f>=100) && (f<=999)
        fname_strt='B00';
    else
        fname_strt='B0';
    end
    fname_end = num2str(f);
    fname = strcat(fname_strt,fname_end,'.txt');
    A=dlmread(fname,'\t',1,0);
    sz = [112 98];
    x = reshape(A (:,1),sz);
    y = reshape(A (:,2),sz);
    u = reshape(A (:,3),sz)';
    v = reshape(A (:,4),sz)';
    x1 = x(:,1);
    y1 = y (1,:)';
    output=IDvortex(x1,y1,u,v);
end

[Stephen23]

As an aside, you should replace all of that complex IF/ELSEIF/ELSE, NUM2STR, and STRCAT with this:

fname = sprintf('B%05d.vc7',j)

Answer 1

[KSSV]

You canmake your output matrix a 3D.

clc; clear all ;
output = zeros(10,4,10);
for f = 1:1:10
    if (f>=1) && (f<=9)
        fname_strt = 'B0000' ;
    elseif (f>=10) && (f<=99)
        fname_strt='B000';
    elseif (f>=100) && (f<=999)
        fname_strt='B00';
    else
        fname_strt='B0';
    end
    fname_end = num2str(f);
    fname = strcat(fname_strt,fname_end,'.txt');
    A=dlmread(fname,'\t',1,0);
    sz = [112 98];
    x = reshape(A (:,1),sz);
    y = reshape(A (:,2),sz);
    u = reshape(A (:,3),sz)';
    v = reshape(A (:,4),sz)';
    x1 = x(:,1);
    y1 = y (1,:)';
    M = IDvortex(x1,y1,u,v);
    output(:,:,f) = M ; 
end

[Turbulence Analysis]

Hi,

Got the below error

Unable to perform assignment because the size of the left side is 10-by-4 and the size of the right side is

1-by-4.

[KSSV]

How it can be error? Size of M is 10*4. and output is intiated to 10*4*10. So depending on f, the result M should be filled in output(:,:,f).

[Turbulence Analysis]

I didn't understand why it pushes error...

[Turbulence Analysis]

I thought below should work, but still it end with error

Unable to perform assignment because the left and right sides have a different number of elements.

output1 = zeros(10,4);

for f = 1:1:10

if (f>=1) && (f<=9)

fname_strt = 'B0000' ;

elseif (f>=10) && (f<=99)

fname_strt='B000';

elseif (f>=100) && (f<=999)

fname_strt='B00';

else

fname_strt='B0';

end

fname_end = num2str(f);

fname = strcat(fname_strt,fname_end,'.txt');

A=dlmread(fname,'\t',1,0);

sz = [112 98];

x = reshape(A (:,1),sz);

y = reshape(A (:,2),sz);

u = reshape(A (:,3),sz)';

v = reshape(A (:,4),sz)';

x1 = x(:,1);

y1 = y (1,:)';

output=IDvortex(x1,y1,u,v);

output1(f)= output;

% a= output(:,1);

% b=output(:,2);

% c=output(:,3);

% d=output(:,4);

% output1(f,:) = [a,b,c,d];

end

[KSSV]

A = zeros(10,4,10) ; 
for i = 1:10
    A(:,:,i) = rand(10,4) ; 
end

Above is giving any error? No, it will not.

You have to check the dimensions of M. Check it.