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Using string saved variables for calculations

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Guillermo Lopez
Guillermo Lopez 2012-6-4
If I have variables with varying names (Z_1,Z_2,Z_3,etc) with assigned values of z made by num2str as shown below;
for v=1:18
eval(['Z_' num2str(v) '=z'])
end
and each has stored a matrix inside (Z_1 is a 10x10 matrix, and so on for each Z_n), and I want to sum up the matrices without having to enter TotalZ=Z_1+Z_2+Z_3...Z_18, is there any quick way of referring to the variables? I mean, something of the kind of :
TotalZ=sum('Z_'num2str(v))
I can't seem to find a way of using those stored variables to o anything, if I dont enter them directly by hand. I need to know the right way of referring to the variables for using them for any calculation. Thanks in advance.

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采纳的回答

Titus Edelhofer
Titus Edelhofer 2012-6-4
Hi,
generally speaking you can do the same as before:
TotalZ = 0;
for v=1:18
TotalZ = TotalZ + eval(['Z_' num2str(v)]);
end
But I would suggest to use cellarrays directly:
allZ = cell(1, 18);
for v=1:18
all{v} = z;
end
Working with the cell array later will be much easier, e.g.,
allZ3D = cat(3, allZ{:});
TotalZ = sum(allZ3D, 3);
Titus

更多回答（1 个）

Walter Roberson
Walter Roberson 2012-6-4

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