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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. 
  extractf(..,'phys') specifies coordinates in physical units (default) 
  extractf(..,'mesh') specifies coordinates in mesh units 
EF = extractf(F) uses the active rectangle (created using the menu 
Insert > Rectangle) 
EF = extractf(F,'draw') lets the user draw a rectangle in the current 
figure, and uses this rectangle to extract the are from F. Note that 
the coordinates of the input field F must coincide with the coordinates 
of the current figure. 
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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