I would like to achieve something like this:
for(i=1:n)
x[i]=value %create a new variable for each x: x1,x2,x3
end
any recommendations?
Thank you
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MATLAB itself recommends not to create a variable at each iteration, so what should we say?HAL9000– HAL90002014-02-02 21:23:56 +00:00Commented Feb 2, 2014 at 21:23
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3 Answers
You do not need different variables. You can do it with eval but I would not go into it and recommend it.
My answer depends on the dimensions of your value variable. I would say if it is a single number then use the following:
for i=1:n
x(i)=value;
end
If value is a string or matrix or different size vectors etc., then use cell array.
for i=1:n
x{i}=value; %notice curly braces.
end
2 Comments
Autonomous
the answer with
eval is already here. I don't have to show it to you.
Luis Mendo
+1. @user3228903 And remember to preallocate if possible
You should never do this. Just to be clear, don't use eval to do this this way:
eval(['x' num2str(count) ' = i^2']);
Comments
Another alternative is to make each x[i] a field in a structure S. Then you can do something like this
S = struct;
i = 1:n;
tmp = strsplit(num2str(i));
for i = i
S.(['x',tmp{i}]) = value(i);
end
Then calling S yields
S =
x1: 0.6557
x2: 0.0357
x3: 0.8491
x4: 0.9340
...
(In this case I just used random numbers for value.) You cannot make x.1, x.2 and so on because fields that start with a numerical character like '1' are not allowed. If you were content with fields like a, b, c ... then you could generate x.a, x.b, x.c ... in a similar way to above.
