blob: abbb56e787051a1835c3996f98cdac92db4d1406 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
subroutine findtic (end1,end2,bigtic,smltic)
c******************************************************************************
c this routine makes tic marks at nice round intervals.
c******************************************************************************
implicit real*8(a-h,o-z)
real*8 end1, end2, bigtic, smltic, span, spanlog
span = end2 - end1
if (span < 0.) span = - span
spanlog = alog10(span)
size = ifix(spanlog)
if (spanlog < 0.) size = size - 1
chop = spanlog - size
if (chop < 0.31) then
bigtic = 10.**(size)/2
smltic = bigtic/5
elseif (chop < 0.71) then
bigtic = 10.**(size)
smltic = bigtic/5
else
bigtic = 10.**(size)*2
smltic = bigtic/4
endif
return
end
|
