CSUB

Subtracts a scalar from an NDF data structure

The routine subtracts a scalar (i.e. constant) value from each pixel of an NDF’s data array to produce a new NDF data structure.

csub in scalar out

Input NDF data structure, from which the value is to be subtracted.

Output NDF data structure.

The value to be subtracted from the NDF’s data array.

The title for the output NDF. A null value will cause the title of the NDF supplied for Parameter IN to be used instead. [!]

csub a 10 b

This subtracts ten from the NDF called a, to make the NDF called b. NDF b inherits its title from a.

csub title="HD123456" out=b in=a scalar=21.9

This subtracts 21.9 from the NDF called a, to make the NDF called b. NDF b has the title "HD123456".

This routine correctly processes the AXIS, DATA, QUALITY, LABEL, TITLE, UNITS, HISTORY, WCS, and VARIANCE components of an NDF data structure and propagates all extensions.
Processing of bad pixels and automatic quality masking are supported.
All non-complex numeric data types can be handled.
Huge NDFs are supported.