Hi Mike,

>> x,y,z values of the last point calculated by MathPts <<

MathPts "f(uv)"input into "InPts" ArrayExt/idxSelect node
Multiply Unum X Vnum minus 1 for input into "idx" on ArrayExt/idxSelect node
then "Out" input into Points2/splitPt to get x,y,z values.

An alternative is to use ArrayExt/ArrayFlipper to idSelect with index of 0

If this does not make sense, upload your file & I modify it

Cheers
James