Why looping just save the last value, not every loop ?

Dear all, I have .TXT data with name ZA000060.TXT, ZA000120.TXT, ZA000180.TXT, ZA000240.TXT, ZA000300.TXT. I load those data with these syntax

for k=60:60:300
    aa = sprintf('%03d',k);
    filename = sprintf('ZA000%03d.TXT', k);
    ZA{k}=load(filename);
end
for k = 1:length(ZA)
x(:) = ZA{k};
% do stuff with x
end

but why the result just store the last data on ZA{k} ? not every data store after looping. how to fix this ?? any help would be great. Best regard,

[gugum gumbira]

also this syntax give me 0x0 struct.

Answer 1

[Stephen23]

Try using a separate vector to store the values:

V = 60:60:300;
C = cell(size(V));
for k = 1:numel(V)
    filename = sprintf('ZA000%03d.TXT', V(k));
    C{k} = load(filename);
end

The original answer used the values of V directly as indices into the cell array, which produced lots of empty cells because only every sixtieth cell had something in it. This is not a good way to code, and it is not a very robust solution to use data values as indices.

[gugum gumbira]

ok, you give me this code before

V = 60:60:300;
S = struct('AAA',{});
for k = 1:numel(V)
    S(k) = load(...,'AAA');
end

but there is error shows up

   end
     |
  Error: Expression or statement is incorrect--possibly unbalanced (, {,
  or [.
  also for this part 
  S(k) = load(...,'AAA');

what exactly that I have to write ?? Thanks

[Stephen23]

I put the ellipses (those three dots):

 S(k) = load(...,'AAA');

to indicate that you have to put the filename there, like this:

   S(k) = load(filename,'AAA');

I wanted to show the important parts of this code, and not focus on things like the filename. If you put the filename there then it will work.

[gugum gumbira]

I wrote again like this

V = 60:60:300;
S = struct('AAA',{});
for k = 1:numel(V)
    S(k) = load(['ZA000060.TXT'],'AAA');
end

the error is Assignment between unlike types is not allowed. The name of my data is ZA000060.TXT, ZA000120.TXT, .... ZA000300.TXT

Thanks a lot

[Stephen23]

That was my mistake: I did not notice that you are trying to load text file, not a mat file. You should load the data into a cell array, exactly like the original answer:

C = cell(size(V));
for k = 1:numel(V)
    filename = sprintf('ZA000%03d.TXT', V(k));
    C{k} = load(filename);
end

For ascii data load does not return a structure, just a numeric matrix. This can be stored in the cell array.

[gugum gumbira]

oke stephen thanks a lot