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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: A MapBasic problem! |
| Date: |
03/30/2003 10:15:01 PM |
| From: |
RAYMOND LI |
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I wrote a MapBasic program to find the minimum distance from the
points of a table to the surrounding points in another table.
The program take a point (one at a time, and consectutively) in table
one, and extracts the objects within 4 km of the point from the
table2 into a temp table. The distance between the point and the temp
table are calculated. The object with the shortest distance are
selected, and the ID from the selected object are put back into an
variable of the point in table one.
The program works very well at the begining. After processing to 4000
points, the speed for the program slow down significantly. When the
process reach 10,000, the speed become so slow that I cannot finish
the remaining processing. It take more than 24 hours to process 1000
cases compare with 20 minutes for the first 1000 cases, and the speed
is continuously to decrease. The speed is reduce exponentially. As a
result, I can't finish the whole process with 17,000 cases. I do not
accumulate any value in my program, and can't find the reason for
slowing down.
Do any one has similiar experience that can help me to solve the
problem? Any idea that leads to the problem?
Raymond Li
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