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extractf
Extract a rectangular area from a vector/scalar field.

Description
EF = extractf(F,[X1 Y1 X2 Y2]) extracts a rectangular area of 
coordinates [X1 Y1 X2 Y2] from the original vector/scalar field(s) F. 
[X1 Y1 X2 Y2] are given in mesh units, not in physical units. 
 
If no output argument, the result is displayed by showvec or showscal. 
 
F. Moisy 
Revision: 1.10,  Date: 2005/10/11. 
 
See Also
truncf, rotatef, shiftf. 

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