How to check if Fortran array contains value?

Question

I've seen this asked for other languages, but having just found out how nicely Fortran can handle arrays, I thought there might be an easy way to do this without loops.

Currently I'm searching over a 3D array looking at 'nearest neighbours' to see if they contain the letter 'n', and whenever it finds this value, I want it to perform some clusterLabel assignment (which isn't relevant for this question)

I wanted to use if(lastNeighArray.eq."n") then...<rest of code> but for obvious reasons it doesn't like checking an array against a value. Neither does it like me using lastNeighArray(:), even though I'd like it to check each of the elements one at a time. where(lastNeighArray.eq."n") doesn't work as I have a case statement inside the where loop and I get the error WHERE statements and constructs must not be nested.

So I'm a little stuck. What I really want is something like when(lastNeighArray.eq."n") but that doesn't exist.

I've also looked at any and forall but they don't seem like the right choice.

Solution

ANY should actually be the right choice

if ( ANY( lastNeighArray=="n" ) ) then

there is also ALL if you wanted the whole array to contain that value.