Data structures for multiple variables

Im trying to create a data structure with 6 elements for 6 satellites i have modelled. when i call stat(1) it works, but when attempting to call an other stat, e.g stat(2), i get an error saying 'index exceeds matrix dimension'

[Walter Roberson]

Your code has

   stat(1).orbital_period_before;

before you have assigned a value to that field.

We cannot test your code because we are missing the values of some of the variables.

[Christopher Maraj]

here is the version of the code with the missing fields removed

[Walter Roberson]

Undefined function or variable 'T1'.