11-10-2005
normally a sub can be called like a function - without the & in front as long as you have the ( ) part at the end so the interpreter can figure out it's a subroutine.
You must have the & when:
you call a subroutine without parameters: ⊂
you call a subroutine indirectly by name &$subref(args);
you call a subroutine by reference &$subref;
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PLOT(3F) PLOT(3F)
NAME
plot: openpl et al. - f77 library interface to plot(3X) libraries.
SYNOPSIS
subroutine openpl()
subroutine erase()
subroutine label(str)
character str*(*)
subroutine line(ix1, iy1, ix2, iy2)
subroutine box(ix1, iy1, ix2, iy2)
Draw a rectangle and leave the cursor at ( ix2,iy2).
subroutine circle(ix, iy, ir)
subroutine arc(ix, iy, ix0, iy0, ix1, iy1)
subroutine move(ix, iy)
subroutine cont(ix, iy)
subroutine point(ix, iy)
subroutine linemd(str)
character str*(*)
subroutine space(ix0, iy0, ix1, iy1)
subroutine clospl()
DESCRIPTION
These are interface subroutines, in the library -lf77plot, allowing f77 users to call the plot(3X) graphics routines which generate graphic
output in a relatively device-independent manner. The f77 subroutine names are the same as the C function names except that linemod and
closepl have been shortened to linemd and clospl . See plot(5) and plot(3X) for a description of their effect.
Only the first 255 character in string arguments to label and linemd are used.
This library must be specified in the f77(1) command before the device specific graphics library; for example, to compile and load a FOR-
TRAN program in prog.f to run on a Tektronix 4014 terminal:
f77 prog.f -lf77plot -l4014
See plot(3X) for a complete list of device specific plotting libraries.
SEE ALSO
plot(5), plot(1G), plot(3X), graph(1G)
4.3 Berkeley Distribution April 30, 1986 PLOT(3F)