# Piecewise functions! how to graph it!

#### laker_gurl3

Okay so i found a link online that's supposed to help you graph piecewise functions..i have a TI-83 graphing calculator and I can't seem to graph the function..
http://fym.la.asu.edu/~tturner/MAT_117_online/piecewisefunction/Piecewise.htm [Broken]
http://fym.la.asu.edu/~tturner/MAT_117_online/piecewisefunction/Piecewise.htm [Broken]

I'm still trying to understand how they graphed the first function. I tried putting it into the calculator like Y1= X, {-1,1} but it shows an error..can anyone guide me through it?
thanks so much

Last edited by a moderator:
Related Introductory Physics Homework Help News on Phys.org

#### laker_gurl3

Just bumping this up, cuz i need to know by tomorrow :( thanks alooot in advance..

#### Xgkkp

I've never done piecewise functions on my calculator, and I got the first one to work fine (fx-9750).

The only thing I could suggest is you said you put Y=X,{-1,1} , whereas the website says to use square brackets? [ ]

#### laker_gurl3

hmmm..so what did you put exactly in ur calculator? and do you have a TI-83? does it have to be on a specific mode or something?
i tried
Y1 = X,{-1,1}
and
Y1= X,[-1,1]

AFter that when i press it to graph it, it comes up as ERR: Synthax...
ahh! :(

#### NSX

Do you have to use a Graphing Calculator?

If not, perhaps you can use Maple.

I'll include sample code in the case you are able to use Maple.

Code:
with(plots):
points := {[-1,-1],[-0.96,-0.151],[-0.86,0.894],[-0.79,0.986],[0.22,0.895],[0.5,0.5],[0.93,-0.306]}:
p := pointplot(points, color=sienna, labels=[x,y]):
p1 := -806.517475*(x+1.0)^3 + (-25)*(-0.96-x) + (-2.48457204)*(x+1.0):
one := plot(p1, x=-1..-0.96, y=-1.5..1.5, color=red):
p2 := -322.60699*(-0.86-x)^3 + (-174.2004278)*(x+0.96)^3 + 1.7160699*(-0.86-x) + (10.68200428)*(x+0.96):
two := plot(p2, x=-0.96..-0.86, color=orange):
p3 := -248.857754*(-0.79-x)^3 + (2.687788307)*(x+0.86)^3 + (13.99083157)*(-0.79-x) + (14.07254412)*(x+0.86):
three := plot(p3, x=-0.86..-0.79, color=yellow):
p4 := 0.1862823579*(0.22-x)^3 + (-0.5797228909)*(x+0.79)^3 +
(0.7862109904)*(0.22-x) + (1.477513935)*(x+0.79):
four := plot(p4, x=-0.79..0.22, color=green):
p5 := -2.091143285*(0.5-x)^3 + (-0.7539202345)*(x-0.22)^3 +
(3.360374205)*(0.5-x) + (1.844821632)*(x-0.22):
five := plot(p5, x=0.22..0.5, color=blue):
p6 := -0.4909248039*(0.93-x)^3+(1.253562694)*(0.93-x)+(-153/215)*(x-0.5):
six := plot(p6, x=0.5..0.93, y=-1.5..1.5, color=magenta):
display(p, one, two, three, four, five, six);
It generates the following graph

http://www.s119875471.onlinehome.us/piecewise.png [Broken]

Last edited by a moderator:

#### what

those sites are about graphing piecewise functions, but it's obvious it's not using a ti83, it wouldn't make sense that it'd work. Anyhow, here's a link that should help youhttp://www.acad.sunytccc.edu/instruct/sbrown/ti83/funcpc.htm [Broken]

Last edited by a moderator: