Multiple functions using indexation numbers

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

Answer 1

[Sean de Wolski]

FAQ

[André Pacheco]

Before i've made my question i've read the FAQ. Although i cannot make the desired code. I've tried using it and i'm able to do simple task like:

for i=1:3
 eval(sprintf('A_%d_result = [1+2]', i));
end

The thing is that i cannot access to the matrix i want to sum inside the eval. Can u give me an example code for this case plz?

[Sean de Wolski]

No, I refuse to use evil eval().

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

[Jan]

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.

Answer 2

[Image Analyst]

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.

[André Pacheco]

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.