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Homework Help: Piecewise functions! how to graph it!

  1. Apr 11, 2005 #1
    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: May 2, 2017
  2. jcsd
  3. Apr 11, 2005 #2
    Just bumping this up, cuz i need to know by tomorrow :( thanks alooot in advance..
  4. Apr 11, 2005 #3
    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? [ ]
  5. Apr 11, 2005 #4
    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}
    Y1= X,[-1,1]

    AFter that when i press it to graph it, it comes up as ERR: Synthax...
    ahh! :(
  6. Apr 11, 2005 #5


    User Avatar

    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 (Text):

    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: May 2, 2017
  7. Apr 11, 2005 #6
    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: May 2, 2017
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