How to rename variables in a loop?

Hello,

I want to load 254 files with the name 'TJJ_arc001' etc. Then I want to concatenate them together so that I go from each individual file (723 x 3127) to (723 x 3127 x 254). I have started below but I keep getting errors with the eval line...can someone help me please?

clc
clear
close

%load('/work/uo0122/u253082/TPJJ_updated/TJJ.mat')

real = ones(723,3127,254);

for arc = 1:10%254

     arcs = make_string100(arc);

     load('/work/uo0122/u253082/TPJJ_updated/TJJ.mat',['TJJ_arc',arcs]);

     eval([ 'TJJ_arc' arcs ]) = m(arc);

end

thanks, Michael

Answer 1

[David Sanchez]

you are not using eval in the right way.

You should do:

x=3;
eval('a = x')
a =

       3

Adapt the code to your need, but take a look at eval documentation to grasp a better idea on how to use the function.

doc eval

Answer 2

[Jos (10584)]

DO NOT DO THIS! The usefulness of variables is that their contents change during execution of a piece of code, not their names …

You could use cells for this or fields in a structure

However, I do not understand your problem completely. You say you have 254 files, but your code suggest you only have a single mat file (TJJ.mat) from which you load individual variables that have a name like TJJ_arcNNN (with N being a number)? And what has the variable m to with this?

Here is some piece of code, that may help you

S = load('TJJ.mat') ; % all variables within this file are loaded in the structure S
FN = fieldnames(S)
for k = 1:numel(FN)
    tmp = S.(FN{k}) ; % access them one by one
    % . . .
end