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How to use SAMPLEXY?



Dear Ferret Users, 

mybe i have a stupid question but i can't find out how to work with the
function SAMPLEXY in the right way, in my example, all the values at a
position x are the same and independently from y. Here my example and
the data:

Many Thanks for your help in advance
regards Ina Uhde


set view ul
def axis /X=-10:30:10 xachs 
def axis /Y=100:500:100 yachs
def grid /x=xachs  /y=yachs xy
file  /grid=xy /col=5 /var=d in1.dat
shade /X=-20:40/Y=0:600 d
file  /var="xptsnew,yptsnew" in2.dat
plot/VS /over /I=1:25 /symbols xptsnew,yptsnew

set view ur
shade  /nokey /nolab /lev=(-99999) d[d=in1.dat]*0
let b=SAMPLEXY(d[D=in1.dat,i=1:5,j=1:5],xptsnew[i=1:25],yptsnew[i=1:25]) 
list /I=1:25 b
go polymark poly/over/key/i=1:25 xptsnew yptsnew b square 0.01
plot/VS /over/i=1:25 /symbols xptsnew,yptsnew

in1.dat
5000.  3440.  2142.  1110.   258.
4131.  2995.  2010.  1412.  1000.
3536.  2777.  2000.  1900.  1883.
3171.  3000.  2775.  2817.  2910.
2901.  3254.  3636.  4000.  4035.

in2.dat
-10. 100.
0 100
10 100
20 100
30 100
-10. 200.
0 200
10 200
20 200
30 200
-10. 300.
0 300
10 300
20 300
30 300
-10. 400.
0 400
10 400
20 400
30 400
-10. 500.
0 500
10 500
20 500
30 500
begin:vcard 
n:Uhde;Ina
x-mozilla-html:FALSE
org:University of Constance
adr:;;;;;;
version:2.1
email;internet:ina.uhde@uni-konstanz.de
title:Dipl. Geographer
x-mozilla-cpt:;31040
fn:Ina Uhde
end:vcard

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