Hello,

I'm trying to plot a basic sine curve with the HP-50g (which it does very well). However, I'm running into some trouble when I try to change the tic marks on the x-axis to appear at intervals of Pi/2.

Here is my procedure:

1. LSHIFT 2D/3D

2. Cursor down to the "pixels" option

3. Uncheck it.

4. Cursor left to "H-Tick"

5. Enter this expression 'Pi/2'

6. Press enter.

It then throws up a "Bad Argument Type" error.

Any help would be appreciated.