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Mask a rectangular area in a vector/scalar field.

EF = maskrectf(F,[X1 Y1 X2 Y2]) masks (i.e., puts zeros) in a 
rectangular area of coordinates [X1 Y1 X2 Y2] in the vector/scalar 
field(s) F. By default, the coordinates are given in mesh units. 
Specify maskrectf(F,[X1 Y1 X2 Y2],'phys') to give them in physical 
units (e.g. in mm). 
See zerotonanfield to mask using NaNs instead of zeros. 
If no output argument, the result is displayed by showf. 
See Also
truncf, extractf, shiftf, flipf, zerotonanfield, 
Published output in the Help browser 
   showdemo maskrectf 

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