Fortran Wiki
norm2 (Rev #2, changes)

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Description

Calculates the Euclidean vector norm ( $L_2$ norm) of array along dimension dim.

Standard

Fortran 2008 and later

Class

Transformational function?

Syntax

result = norm2(array[, dim])

Arguments

array - Shall be an array of type real.
dim - (Optional) shall be a scalar of type integer with a value in the range from 1 to n, where n equals the rank of array.

Return value

The result is of the same type as array.

If dim is absent, a scalar with the square root of the sum of squares of the elements of array is returned. Otherwise, an array of rank $n-1$ , where $n$ equals the rank of array, and a shape similar to that of array with dimension dim dropped is returned.

Example

program test_norm2
 real :: x(5) = [ real :: 1, 2, 3, 4, 5 ]
 print *, norm2(x) ! = sqrt(55.) ~ 7.416
end program

Fortran Wiki norm2 (Rev #2, changes)