ekkel@idca.tds.PHILIPS.nl (Erik Ekkel) (11/29/88)
I want to use the troff "grap" preprocessor to plot a graph. The problem is
that the input has as x-coordinate weeknumbers. So the range of the
x-axis is e.g. 8801:8852, 8901:8952, ..........
How can i tell "grap" that there is a gap in the x-axis; that week 8901 is the
successor of week 8852 and NOT 8900 !
--
__
/ Erik Ekkel, Philips PTDSN (+31 55 433301)
/-- __ o / Domain: ekkel@idca.tds.philips.nl
/___ _/ (_(_ /( Uucp : ...!mcvax!philapd!ekkelkjk@pbhyf.PacBell.COM (Ken Keirnan) (12/01/88)
In article <618@wc11.idca.tds.philips.nl> ekkel@idca.tds.PHILIPS.nl (Erik Ekkel) writes: >I want to use the troff "grap" preprocessor to plot a graph. The problem is >that the input has as x-coordinate weeknumbers. So the range of the >x-axis is e.g. 8801:8852, 8901:8952, .......... > >How can i tell "grap" that there is a gap in the x-axis; that week 8901 is the >successor of week 8852 and NOT 8900 ! If you know the number of points along the x-axis in advance, one way would be to specify the number of x-axis intervals with the "coord" keyword and then make the week numbers tick labels. For example if you have 52 points on the x-axis: coord x 0,52 ticks bot out at 1 "8801",2 "8802" ... or whatever interval you want between ticks. I know this is messy, but nothing else comes to mind. -- Ken Keirnan - Pacific Bell - {att,bellcore,sun,ames,pyramid}!pacbell!pbhyf!kjk San Ramon, California kjk@pbhyf.PacBell.COM
msb@sq.uucp (Mark Brader) (12/05/88)
> How can i tell "grap" that there is a gap in the x-axis; that week 8901 is the > successor of week 8852 and NOT 8900 ! Probably the easiest way is to turn that number into something that'll increase linearly, by arithmetic operations. You turn 8852 into 88+51/52 and 8901 into 89. If the year and week number, in combined form as in 8852, is w, then the value you want to use is: (w%100-1)/52 + int(w/100) One way to achieve this transformation is to precede the list of data points with the following grap command: copy thru @ next at (($1%100-1)/52 + int($1/100), $2) @ (The @ characters are delimiters for the body of "copy thru".) Then each data line, say 8842 166.9 will cause a point to be plotted at ((88%100-1)/52 + int(88/100), 166.9) which is (88+41/52, 166.9) which is what you want. You do still have to declare your own ticks for the x-axis if you want meaningful labels on them, though. You might say: ticks bot at 87 "Jan 1987", \ 87.5 "Jul 1987", \ 88 "Jan 1988", \ 88.5 "Jul 1988", \ 89 "Jan 1989", \ 89.5 "Jul 1989", \ 90 "Jan 1990" Or you might have a tick for every week and not label them. ticks bot from 87 to 90 by 1/52 "" Or you might do both. You can plot multiple sets of ticks on the same axis; they just overprint on top of each other. An alternative general approach is to define a new set of coordinates (using the "coord" keyword) for each year; this involves more nuisance, but does enable you to get numerical week labels for each year if you want. The following will again plot from the beginning of 1987 to the beginning of 1990, but you get ticks at 8701, 8710, 8720, 8730, 8740, 8801, etc. coord yr87 x 8701 ,8701+3*52 y 0,200 coord yr88 x 8801- 52,8801+2*52 y 0,200 coord yr89 x 8901-2*52,8901+ 52 y 0,200 coord yr90 x 9001-3*52,9001 y 0,200 ticks bot at yr87 8701 ticks bot from yr87 8710 to 8740 by 10 ticks bot at yr88 8801 ticks bot from yr88 8810 to 8840 by 10 ticks bot at yr89 8901 ticks bot from yr89 8910 to 8940 by 10 ticks bot at yr90 9001 Then you'd have to plot each point in the appropriate coordinate system. Put the following just above the list of data points: copy thru ! year = int($1/100) if (year <= 87) then @ next at yr87 ($1, $2) @ if (year == 88) then @ next at yr88 ($1, $2) @ if (year == 89) then @ next at yr89 ($1, $2) @ if (year >= 90) then @ next at yr90 ($1, $2) @ ! You could also make it more robust by checking whether "year" was in range. Note: Both of the above methods have been tested with our version of grap, which is called sqgrap and is included with SoftQuad Publishing Software. I have not tried them with any earlier versions of grap. Mark Brader "... there is no such word as 'impossible' in SoftQuad Inc., Toronto my dictionary. In fact, everything between utzoo!sq!msb 'herring' and 'marmalade' appears to be missing." msb@sq.com -- Douglas Adams: Dirk Gently's Holistic Detective Agency