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Extract a rectangular area from a vector/scalar field.

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. 
By default, the coordinates are given in mesh units. Specify 
extractf(F,[X1 Y1 X2 Y2],'phys') to give them in physical units (e.g. 
in mm). 
If no output argument, the result is displayed by showf. 
See Also
truncf, rotatef, shiftf, flipf, remapf. 
Published output in the Help browser 
   showdemo extractf 

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