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How do you type a piecewise function into the TI-84?

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Here is an asurd example of a piecewise function
Y1=11 for X less than 10
Y1=3 for X in the range [10, 20[
Y1=X+5 for X in the range [20, 30[
Y1=10 for X larger than 30

Here is the screen capture of the Y= editor window.
You have

  1. the definition of the function within a domain, enclosed in () followed by the domain enclosed in ()
  2. a + to introduce the second piece (definition) (domain)
  3. + a third piece (definition ) (domain)
  4. and so on.
  5. Use the [2nd][TEST] key sequence to access the relational operators, less than, greater than, etc.
Here are two screen captures for the Y= editor and the resulting graph. Yoy have to play with the window dimension to display a clear graph. Note : 3 pluses in equation, 4 pieces in graph.

How do you type a piecewise function into the - eb3069c.jpg




Posted on Mar 19, 2010

  • k24674 Mar 19, 2010

    Sorry, the + in the definition of the function, (X+5) in the third interval does not count towards the number of pieces.

  • k24674 Mar 19, 2010

    You can use the logical AND operator in the definition of the limits of a domain. See screen capture below.



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1. To graph a function, Press [Y=] to enter the function editor.
2. Type in a legitimate function.
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4. Press the GRAPH key to draw the graph.
5. Play with the window dimensions or use the ZOOM feature
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1 Answer

I don't remember how to type a piecewise function into the y= screen so that i can specify i want one graph (.5x+5) from 0<x<10 and the other (10+2x) x>10


Here is an absurd example of a piecewise function
Y1=11 for X less than 10
Y1=3 for X in the range [10, 20[
Y1=X+5 for X in the range [20, 30[
Y1=10 for X larger than 30

Here is the screen capture of the Y= editor window.
You have
  1. the definition of the function within a domain, enclosed in () followed by the domain enclosed in ()
  2. a + to introduce the second piece (definition) (domain)
  3. + a third piece (definition ) (domain)
  4. and so on.
  5. Use the [2nd][TEST] key sequence to access the relational operators, less than, greater than, etc.
Here are two screen captures for the Y= editor and the resulting graph. You have to play with the window dimension to display a clear graph. Note : 3 pluses in equation, 4 pieces in graph.
The + in the definition of the function, (X+5) in the third interval does not count towards the number of pieces.

eb3069c.jpg

cd185fa.jpg

You can use the logical AND operator in the definition of the limits of a domain. See screen capture below.
51a3461.jpg

Jan 20, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

Im trying to make a piecewise function with more than 10 functions what can i do???


Hello,
You can actually represent all pieces of the function as a single function. There is an exemple in the calculator manual at page 17-4. You can use it to learn how to implement your function.
The relational operators (less than or equal to, etc.) are accessed through the TEST menu.
hope it helps.

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