how to use eval function in order to get the value of variable with fieldname ?

Hi,

I have a cell array with structure expression. I'd like to use eval function to populate a variable like this:

eval('Data{50}.Set{2} = [15.5 10.2; 0.01 2.0];');

in order to have:

Data{50}.Set{2} = [15.5 10.2; 0.01 2.0];

But I got this error:

Unable to perform assignment because dot indexing is not supported for variables of this type.

How can I handle this with eval ?

Thank you

Answer 1

[Jan]

Why do you want to do this by the evil eval? See: TUTORIAL: how and why to avoid Eval . Beginners tend to try to solve problems by eval() not knowing, that this causes more problems than it solves.

But the error message has another reason: If Data is not a struct, you cannot append a field.

Data = 0;
Data.Set = 5

Unable to perform assignment because dot indexing is not supported for variables of this type.

The error is fuxed, if you define Data as a struct before. But the main question remains, why you want to do this by eval?

Data{50}.Set{2} = [15.5 10.2; 0.01 2.0];

This is perfect already.