Should I use Fortran for my new project? If you’re writing a program or a library to perform fast arithmetic computation over large numeric arrays, Fortran is the optimal tool for the job.

A module is like a package where you can keep your functions and subroutines, in case you are writing a very big program, or your functions or subroutines can be used in more than one program. …

Arrays can be one- dimensional (like vectors), two-dimensional (like matrices) and Fortran allows you to create up to 7-dimensional arrays.

The programming is aiming at performance, and the fortran 77 version of Lapack and BLAS is used under the hood. Some performance critical routines, like matrix-matrix and matrix-vector …

Modules and Programs # Modules are the preferred way create modern Fortran libraries and applications. As a convention, one source file should always contain only one module, while the …

Module: a program unit used to package together type declarations and subprograms MODULE Name CONTAINS subprogram #1 subprogram #2 etc. END MODULE name Packages the subprograms, …

Arrays and strings # More often than not, we need to store and operate on long lists of numbers as opposed to just the single scalar variables that we have been using so far; in computer programming …

Try the quickstart Fortran tutorial, to get an overview of the language syntax and capabilities.

Data is transferred between the program and devices or files through a Fortran logical unit. Logical units are identified in an I/O statement by a logical unit number, a nonnegative integer from 0 to the …

Passing subsections of arrays Next we want to write a subroutine for matrix-vector multiplication. There are two basic ways to do this, either by using inner products or saxpy operations. Let us be modular …