How to get 2 variables form loading mat fille

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Rita
Rita 2016-2-5
评论： Star Strider 2016-2-5
I want to load lots of mat file like (a1_2.mat......a50_40.mat) and take two variables(c,d) from each mat file and then put variables in a matrix like this.[c1 d1; c2 d2.....]
for n = 1 : 50
for k=1:40
y=load(['a',num2str(n),'_', num2str(k) '.mat']);
c = y.c;% load first variable
d=y.d; % load second variable and
all(:,1)=c;
all(:,2)=d;
end
end
but I can't get the final matrix correctly.
Thanks in advance for your help.

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采纳的回答

Walter Roberson
Walter Roberson 2016-2-5
for n = 1 : 50
for k = 1:40
y = load(['a',num2str(n),'_', num2str(k) '.mat']);
c = y.c;% load first variable
d = y.d; % load second variable and
all_vals(n,k,1) = c;
all_vals(n,k,2) = d;
end
end
all_vals = reshape(all_vals, [], 2);

更多回答（1 个）

Star Strider
Star Strider 2016-2-5
Assuming that you cannot pre-allocate your matrix, something like this could work:
all_vars = [];
for n = 1 : 50
for k=1:40
y=load(['a',num2str(n),'_', num2str(k) '.mat']);
c = y.c;% load first variable
d = y.d; % load second variable and
all_vars = [all_vars; [c d]];
end
end
I changed the name of your matrix, because all is a function name you could need later in your code. Naming variables the same as built-in MATLAB functions is called ‘overshadowing’. MATLAB will use the variable instead of the function afterwards, making the function useless until you change the variable name.
  2 个评论
Rita
Rita 2016-2-5
Thanks Walter for your prompt response.unfortunetly my results had 30 rows of zero number. Thanks Star strider for your explanation.and the result is perfect.
Star Strider
Star Strider 2016-2-5
My pleasure.
I am glad I was able to solve your problem!

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