# grapher help!

Discussion in 'Mac Apps and Mac App Store' started by meia, Apr 10, 2008.

1. ### meia macrumors newbie

Joined:
Apr 10, 2008
#1
hello

i'd like to know how i can set parameters with the equations i type in grapher.

the equation i've got is y=26.5e^(-0.1805)(t-6) but i'd like to limit it to 0<t<6 and 6.5<N<26.5

how do i do this?

2. ### alexbasson macrumors newbie

Joined:
Nov 30, 2005
#2
I do this kind of thing all the time. It's a bit of a hack, but it works.

1) From the "y=" prompt, before you type in your equation, select the "{ x < 0, x = 0, x > 0" option (i.e. the piece-wise defined option) from the pull-down menu at the right-hand side of the input bar.

2) For the number of conditions, type "1" and click OK.

3) Enter the right side of your equation into the first blank.

4) In the second blank, enter your limits on t. You can't write "0 < t < 6", because Grapher can't understand that. Instead, you need to write
"(0 < t)&(t < 6)".

That'll do it. Your equation doesn't have an N in it, so that's why I didn't address that part of your question, but if the directions above work for you, you can probably figure out the rest on your own. Good luck!

Joined:
Apr 10, 2008