Calling a variable from a variable

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Matt
Matt il 13 Giu 2011
e.g With variables:
a b c d
V = who;
Now:
V (2) = b
b(1) = 3000 (for example)
I would like to call variable b using the newly created variable V:
e.g something like [V(2)](1) = 3000
I'm not sure where to start tbh
any help would be great,
thanks in advance,
Matt

Risposta accettata

Matt
Matt il 13 Giu 2011
Just done it using eval
e.g
a = eval((char(V(1,1)))); >> a (1,1);
thanks for the help guys,
Matt

Più risposte (3)

Paulo Silva
Paulo Silva il 13 Giu 2011
assignin('base',char(V(2)),3000)
  1 Commento
Matt
Matt il 13 Giu 2011
Thanks, Instead of putting a value into the variable I would like to check the contents.

Accedi per commentare.


Richard
Richard il 13 Giu 2011
These kind of situations are best handled by storing the original data in a variable type that is designed to map strings to data. The simplest option is to use a structure which supports indexing with a string variable:
s.a = 1;
s.b = 2;
s.c = 3;
s.d = 4;
V = 'b';
s.(V) = 3000;
In some situations, you might want to look at the containers.Map object.

Matt Fig
Matt Fig il 13 Giu 2011
I don't understand why you would want to do this, but here is a way to automate it.
clear all % Fresh start...
a = [1 2 3];
b = [4 5 6];
save myvars
N = who;
V = load('myvars')
V.(N{1})(3) % Returns a(3)

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