#### Topic: end points on custom functions

This is an absolutely awesome tool that has been taken over by my school's math department... All of our staff members are now using it to prepare graphs for tests/quizzes/demonstrations.

I'm trying to define a custom function so that I can display some reflections/translations/stretches/compressions of it.... The function I'm starting with is (I've cut and pasted the relevant lines from the .grf file):

[CustomFunctions]

Mine(x) = ifseq(x>-3 and x<-1,-x-2,x>-1 and x<2,-2,x>2 and x<3,3x-9)

i.e., one with three pieces. My goal is to be able to show -mine(-x), Mine(2x)-1, or mine(abs(x)). This works quite nicely. But how can I add closed and open circles to Mine(x) to show closed and/or open endpoints?