... Array functions . ... Random number routines There is a large a number of intrinsic functions and five intrinsic subroutines in Fortran 90. ... ALL(MASK, dim) returns a logical value that indicates whether all relations in MASK are .TRUE. , along only the desired dimension if the second argument is given. ... SIZE(ARRAY, dim) is a function which returns the number of elements in an array ARRAY , if DIM is not given, and the number of elements in the relevant dimension if DIM is included. ...