Posts: 3,229

Threads: 42

Joined: Jul 2006

Look at the back panel for details of the TEST instruction.

- Pauli

Posts: 2,448

Threads: 90

Joined: Jul 2005

Jim,

The 15c has additional tests compared to the 11c. Unlike the 11c however, only two of the tests are directly labeled and keyed. The other ten are called using sequence g TEST n.

Below is a comparison table:

11C has 8 tests, all in the 10th column of keys:

x<=y

x<0
x>y

x>0

x not y

x not 0

x=y

x=0

For the 15c, look on the back of the calculator and you will see a table thus:

ERROR TEST MATRIX

0 | y/0, LN 0...| x not 0 | 0 DIM

1 | ---- | x > 0 | ------

2 | ------ | x < 0 |
etc.

So to get "X > 0" you key in g TEST n which is g followed by the minus key, followed by the number 1.

I hope that helps,

Bill