I think this whole thing is going to drive me crazy : ) CALL MATOUT(S,2,2,2,2,4HS) needed to be.... CALL MATOUT(S,2,2,2,2,4HS ) why this works I have no earthly idea... So here's what I'm down to now... c:\Fort99\G77\bin>g77.exe -Wall RHFV2.f RHFV2.f:187: warning: F0=DSQRT(PI/ARG)*DERF(DSQRT(ARG))/2...