Name of an array with strcat and int2str. Simple task or not ?

Hi eveyone !

I'd like to change the name of an array containing an index evolving inside a loop. However, I'd wish to mention the value of the index in the very name of the array.

For instance, let's catch a glimpse at the following code :

a=[1 2 3; 4 5 6 ; 7 8 9];

b=zeros(3,3);

for i=1:3

      z=strcat('b_',int2str(i));
      z=b;
      z(2,i)=a(1,i)

end

Instead of reading z(2,3)=3, I'd like to obtain b_1(2,1)=1, b_2(2,2)=2 , b_3(2,3)=3 . I'm also aware of the problem linked with the existence of an initialization inside the loop.

Could you give me any solutions to solve this question ?

Thanks.

Answer 1

[Andrei Bobrov]

This is bad way - use many variables names:

a=[1 2 3; 4 5 6 ; 7 8 9];
b=zeros(3,3);
for i=1:3
      eval(sprintf('b_%d = b;',i));
      eval(sprintf('b_%d(2,%d) = a(1,%d);',i,i,i));
end

See Jan's answer

[Geoff]

Thank you for your pieces of advice.

[Jan]

@Geoff: Did you read the FAQ?

Answer 2

[Jan]

Don't do this. Use b{1}, b{2}, ... instead, because this is nicer, safer, faster and more flexible.

This topic is discussed frequently. And as all frequently appearing questions, it is mentioned in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

[Geoff]

Thanks for the help !