Concatenate strings as a variable in matlab?

Question

I have data sets stored to several variables like: p1_5, p1_7,p1_9....p1_19, and I want to calculate the std() of each data set. Now how to do it in a for loop in matlab? How to concatenate 'p1_' to n, but still keep it as a variable but not string?

for n = 5:2:19
    std(p1_??);  
end

I would highly recommend restructuring your data so you do not have to use an eval command as Dan had recommended in his answer. — MZimmerman6
– MZimmerman6, Commented Nov 25, 2013 at 12:42

Dan · Accepted Answer · 2013-11-25 12:37:04Z

3

You can use eval for this:

for n = 5:2:19
    eval(['std(p1_', num2str(n), ')']);  
end

But you should probably consider restructuring your code to not have to. Could you store all your p1s in a 3D matrix or a cell array?

answered Nov 25, 2013 at 12:37

Dan

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cyborg · Accepted Answer · 2013-11-25 12:41:34Z

2

You could put them in a cell array. Even better, if they have the same dimensions, stack them in a matrix.

answered Nov 25, 2013 at 12:41

cyborg

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