Multiple functions using indexation numbers

Question

André Pacheco 2013-1-3

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Hello,

I've got a problem where i have multiple matrix that have similar names but just changes the number of it. p.e.

 A_1=[2 4 4
      2 9 1]
 A_2=[3 5 1
      7 8 9]
 A_3= ...
 A_4= ...

And then i have a function that sums each line and then keeps the result.

A_1_result=[ 10
             12]
A_2_result=[ 9
           24]
A_3_result=...
A_4_result= ...

I'do this using 1 for cicle similar to this:

 for i=1:2
   A_1_result(i)=sum(A_1(i,:);
   A_2_result(i)=sum(A_2(i,:);
   A_3_result ....
 end

Isn't there any possibility to put this in a for loop from 1 to 4 and use p.e.

A_{j}_result(i)=sum(A_{j}(i,:);

Thanks in advance

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Answer 1

Sean de Wolski 2013-1-3

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FAQ

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Sean de Wolski 2013-1-3

No, I refuse to use evil eval().

Use a 1x20 cell array as the FAQ suggests. It will make your life much easier.

Jan 2013-1-3

I agree with Sean's suggestion. The FAQ is called FAQ, because these problems occur frequently. And in all cases avoiding EVAL is the best solution.

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Answer 2

Image Analyst 2013-1-3

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I would say that, if you could even do it, for only 4 variables the illegibility it would add to your code would make it not worth it. Right now it's intuitive and easy to follow - why mess it up? You wouldn't even be reducing that many lines of code.

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André Pacheco 2013-1-3

I just showed a simple case. In my case i have a much more complicated problem where i do have more than 4 variables (around 20) and with much more equations than a simple sum. It would save me from writing down all the variables and i wanted to put the option that u could chose the number of variables. And thats not possible if i have to write down all the options for only 1 variable, to 20 variables. It would be necessary a 20 if's for the different number of variables u could chose.

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