8.171 MERGE — Merge variables

Description:
Select values from two arrays according to a logical mask. The result is equal to TSOURCE if MASK is .TRUE., or equal to FSOURCE if it is .FALSE..
Standard:
Fortran 95 and later
Class:
Elemental function
Syntax:
RESULT = MERGE(TSOURCE, FSOURCE, MASK)
Arguments:
TSOURCE May be of any type.
FSOURCE Shall be of the same type and type parameters as TSOURCE.
MASK Shall be of type LOGICAL.
Return value:
The result is of the same type and type parameters as TSOURCE.

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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-4.9.3/gfortran/MERGE.html