sub

The sub function subtracts a numeric value from a CImage object or 1-dimensional array.

Whereas this function operates on a pure (indexed) array, the slightly slower subn function operates on a general table that may be a multi-dimensional array or contain a mixture of numbers, strings, named keys, and sub-tables.

Syntax

result = sub( object, value )

where object is a 1-dimensional array, CImage object, or simple number.

value is a number.

result is returned as an array, CImage object, or number, depending on the type of value.

Examples

The following script subtracts 3200.5 from all members of a table.

t = sub( tbl, 3200.5 )

-- subtract the number from all members of the table

The next script subtracts 3200.5 from all pixels of a CImage.

V = AttachView( "CImageView" )	-- attach the topmost image window
Assert( V and V:Count() > 0 )	-- make sure an image window is on top
sub( V:GetImage(), 3200.5 )	-- subtract the number from the CImage

Syntax

Examples

Related Topics