Scantable Mathematics

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8.3.3.5 Scantable Mathematics

It is possible to do simple mathematics directly on scantables from the CASA command line using the +,-,*,∕ operators as well as their cousins + =,- =,* =,∕ =.

CASA <10>: scan2=scan1+2.0 # add 2.0 to data
CASA <11>: scan *= 1.05 # scale spectrum by 1.05

Operands can be a numerical value and one- or two-dimensional Python list. For list operand, its shape should be conform with the shape of spectral data stored in the scantable. Mathematics between two scantables is also available. In that case, scantables must be conform with each other.

NOTE: In scantable mathematics, scantable must be put on the left. For example:

CASA<12>: scan2=scan1+2.0 # this works
CASA<13>: scan2=2.0+scan1 # this causes an error

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