Difference between revisions of "SequentialGrid"

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(Created page with "'''Q:''' How to generate a grid with sequential numbers? '''A:''' In a shell, first get number of rows and columns as environment variables: eval `g.region -g` (or just n...")
 
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'''Q:''' How to generate a grid with sequential numbers?
 
  
'''A:'''
 
 
In a shell, first get number of rows and columns as environment variables:
 
 
eval `g.region -g`
 
 
(or just note the output of g.region -p and insert the relevant value at the appropriate place in the formulas below)
 
 
Then use the variable 'rows' or 'cols' as follows:
 
 
r.mapcalc "grid_seq = col() * $rows + row() - $rows"
 
 
gives you a "vertical" sequence.
 
 
r.mapcalc "grid_seq = row() * $cols + col() - $cols"
 
 
gives you a "horizontal" sequence.
 
 
 
[[Category:FAQ]]
 

Revision as of 06:10, 18 September 2012