Writes matrix 'B' in matrix 'A' according to 'mask'.
a NumericMatrix.
a NumericMatrix.
a NumericMatrix.
x offset in 'A' to start writing 'B'.
x offset in 'A' to start writing 'B'.
a logical. Default is false.
When false, the default, values of 'B' are written into 'A' when 'mask' is not 0.0.
When true, values of '1-B' are written into 'A' when 'mask' is not 0.0.