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changing matrix size using interpolation [message #74424]

Mon, 17 January 2011 06:31

oxfordenergyservices is currently offline

oxfordenergyservices
Messages: 56
Registered: January 2009

Member

I think this might not be too hard but it would be great to have a
pointer to the routines...

I have a x by y matrix (of elevations for a topographic map)

I want to turn it into a new matrix which is n by m where n and m
could be greater or less than x or y and not necessarily an integer
multiple or fraction.

I have tried this...

x=4.0
y=4.0

a=findgen(x,y)

m=7.0
n=7.0

b=interpolate(a,findgen(m)*(x-1)/(m-1),findgen(n)*(y-1)/(n-1 ),/
GRID,missing=-1)

print,a
print,b

and it seems to work, but this must have been done many times before
and just wanted to check I'm right?

Thanks

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