# 6.3 Fortran Intrinsic Functions

The intrinsic functions, supplied in the Fortran libraries, perform frequently used computations.

References to Fortran intrinsic functions use the same form as references to user-defined functions. For example, the following intrinsic function reference is valid:

    R = 3.14159 * ABS(X-1)

This reference to the intrinsic function ABS causes the absolute value of `X-1` to be multiplied by the constant 3.14159; the result of that calculation is assigned to the variable R.

Two methods of referencing intrinsic functions are described in the following section.

For More Information:

- On intrinsic functions, their data types, and the data type of their actual arguments, see Section C.2.

- On BLAS routines available on VAX systems, see Section C.3.

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