Help about 'calling a variable from workspace by using input command'

Hi, here is my question; I have some values in workspace which ones names are VarName1, VarName2... And I want to call them by using a input command.

For example

 a = 'Enter the number of VarName';
 number = input(a);

Then if I enter 18 as number input, it must call VarName18 from workspace. Please help me, thank you.

[Stephen23]

Do not do this. It will make your code slow, complicated, and buggy:

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

https://www.mathworks.com/matlabcentral/answers/325569-finding-the-means-of-a-large-number-of-individual-matrices

Answer 1

[Stephen23]

Do not access lots of variable names like that. It will make your code slow, complicated, and buggy:

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

https://www.mathworks.com/matlabcentral/answers/325569-finding-the-means-of-a-large-number-of-individual-matrices

Just keep all of your data in one variable, and use indexing. Then your task it trivially easy:

>> C{1} = 0:3;
>> C{2} = 4:6;
>> C{3} = 7:9;
>> idx = str2double(input('enter variable #: ','s'));
enter variable #: 2
>> C{idx}
ans =
     4     5     6

Look at that: good program design using indexing made my code simple, efficient, and easy to understand. Any code that you write that accesses variable names will be slower, buggier, and more obfuscated.