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I am a novice Fortran 90 programmer. If I wish to use a WHERE test on only a portion of the dimensional domain of the arrays involved, do I write where (ltest(1:nx,1:ny,1:nz)) a = b + c or where (ltest) a(1:nx,1:ny,1:nz) = b(1:nx,1:ny,1:nz) + c(1:nx,1:ny,1:nz) or limit both the ltest and a,b,c arrays? What is the most efficient and portable (or even legal)? Thanks for your help. Dave Rector Staff Scientist, Fluid Dynamics Pacific Northwest National Laboratory Mail Stop K7-15 P.O. Box 999 Richland, WA 99352 509-372-4530 voice 509-375-3865 fax [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%