gonum.org/v1/gonum@v0.15.1-0.20240517103525-f853624cb1bb/mathext/internal/amos/amoslib/myatan.f (about)

     1        DOUBLE PRECISION FUNCTION MYATAN(A)
     2        DOUBLE PRECISION A
     3        MYATAN = DATAN(A)
     4        RETURN
     5        END