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How can I use the content of a variable to call another variable?

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I'm confronted with the following problem:
eur2usd =[ 1.3 1.2 1.1];
eur2cad =[0.8 0.9 0.7];
currency = 'eur2usd'
I would like to use the variable currency to call the content of eur2usd ([ 1.3 1.2 1.1]). So that if currency = 'eur2cad', I can call the content of eur2cad by using the variable currency.
  2 comentarios
Adam el 18 de Ag. de 2014
I would favour coming up with a solution which didn't require you to do that. e.g. having currency be a function handle rather than a raw variable-name string, or using containers.Map or some kind of array to index into.
But if you are set on having a variable name in a string I'm sure someone can soon furnish you with the appropriate eval-based syntax.
Stephen23 el 4 de En. de 2015
Editada: Stephen23 el 12 de Sept. de 2023
Basically you should not do this.
Using dynamically defined variable names or encoding data within the variable name is a pretty bad approach:
You should probably be using for your data: structures. This shows how it could work:
>> A = struct('eur2usd',[ 1.3 1.2 1.1],'eur2cad',[0.8 0.9 0.7]);
>> A.('eur2cad')
ans = [0.8,0.9,0.7]
Note that using a structure is extendable to any number of currencies without cluttering-up your workspace with a thousand variables. There is also a large selection of tools that you can use to manipulate structures, their fields and contents:
Summary: do not use eval to encode (meta-)data into the variable names!

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Andrew Reibold
Andrew Reibold el 18 de Ag. de 2014
Editada: Andrew Reibold el 18 de Ag. de 2014
  1 comentario
Image Analyst
Image Analyst el 4 de En. de 2015
David's "Answer" moved here since it'a not an Answer to the origianl question but a reply to Andrew

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