Array indices must be positive integers or logical values

Help me please. An error occurs when starting the program. How do I fix it?

Answer 1

[Jan]

I looks like this is a script. Then is shares the workspace variables with its caller. I guess, that you have created an array called "real" anywhere. Then real(Io) does not call the function real(), but uses the values of Io as indices.

Check this by:

which real

Using function avoids such confusions, because you can check the local code, if a variable with such a name is created.

Avoid using names of builtin functions for variables.

[Andrey Alexandrov]

Jan, thank you very much for your comment. The program started

Answer 2

[Wan Ji]

You can do this by

Iout = double(Io)

[Andrey Alexandrov]

Wan Ji, thank you so much for your comment