How to update file names and save file contents in workspace.

Hello, I want to get output like this and save the each variable (a1, a2, ....) in the workspace individually with name a1, a2,...... for further analysis,

a1= Y(:,:,1);
a2= Y(:,:,2);
a3= Y(:,:,3);
............
an= Y(:,:,4);

Why the all variables ((a1, a2, ....) are not saved in the workspace-rather than erased. Got only the last variable. Moreover, name of the variable is also not updated as 'an'

Code:

for i = 1:43
   j = 'a';
   b= [j num2str(i)];
   b = Y(:,:,i);

end

[Stephen23]

The best answer is: "don't do this".

http://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F