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hiding columns and area-avg
There's two important features I'd like to understand about,
or add to, siag.
1. How can I get area-avg (or r_avg) to ignore cells with no values?
I use siag for student grades and I want to average scores for
only those students taking the exam and ignore blanks for students
who missed it.
I see in siag.scm that (define (area-avg r1 c1 r2 c2) has the atom
(if (number? val). What does this mean if not "if val is a
number?" Why are blank cells getting averaged as zeroes?
2. Is there any way to hide columns? I've grown fond of this feature
in Lotus 123 or xspread so I can print out just selected columns
for posting of grades.
Also ... can anyone recommend a good introduction to scheme? I'm
pretty good with Emacs lisp but many atoms in the various *.scm
files are unknown to me.
My sincere thanks to anyone who can help me with these questions.
*,,,,/\o__ H. Mark Perks Dept of Chem, UMBC 9,
firstname.lastname@example.org 410 455-2789 Baltimore, MD 21250 <\