CMatrix:RowExists

The RowExists method returns true if the CMatrix contains a row at index n.

Syntax

bTrue = CMatrix:RowExists( nRow )

where

nRow is the index of the row to be tested.

bTrue is returned as true if the matrix contains a row at index nRow. If not, then false is returned.

Since Lua matrices are sparse, there does not need to be a row at index nRow. Moreover, the CMatrix cannot contain a row having less than 1 column. If true is returned, then a row exists at index nRow and it contains at least 1 column.

Example

The following script returns false (printed as integer value 0) after a row is removed, then tested:

M = CMatrix:new()	-- create a CMatrix object
M:Set( 1, 4, "s1")	-- set member in row 1
M:Set( 1, 10, "s2")	-- set member in row 1
M:Set( 2, 18, "s3")	-- set member in row 2
M:Set( 2, 120, "s4")	-- set member in row 2
M:RemoveRow( 2 )	-- remove the row at index 2
Printf("Exists = %d",M:RowExists(2))	-- result: Exists = 0