How do i 'relabel' variables (in fortran)

[tothetop]

Suppose I have a global variable like "GauntCoefficients".. and I want to use it in a formula in the next block of code. In C++, I might do something like this to make the code more readable:

const int* gc = GauntCoefficients;
(then write some nasty formula with "gc" rather than "GauntCoefficients" everywhere)

Since "gc" is declared here as a constant, the compiler should just delete it (I think). And since "gc" id declared locally.. it doesn't pollute the namespace.

Can I do something like that in Fortran?

 

[eys_physics]

Hey
In Fortran 90 and newer pointers are possible to use. But they are more restrictive than in e.g. C/C++.
You can therefore do something like this:

integer, target::GauntCoefficients
integer, pointer::gc
gc=>GauntCoefficients

I hope this helps.

 

[quicknote]

In Fortran, you can use the "parameter" statement to declare a constant variable that can be used in place of the original variable. For example:

parameter :: gc = GauntCoefficients

This will allow you to use "gc" in place of "GauntCoefficients" in your formula without changing the original variable. Additionally, since "gc" is declared as a constant, it will not be changed during the execution of the program.

You can also use the "use" statement to access global variables from a different module without having to use the full variable name. For example:

use mymodule, only: GauntCoefficients

This will allow you to use "GauntCoefficients" in your formula without having to specify the module name every time.

In summary, there are ways to "relabel" variables in Fortran for the purpose of improving readability and avoiding namespace pollution. The "parameter" and "use" statements are two options that can achieve this.