Question

I was playing around with programming on my TI-84 in math class today and I decide to try to write a program that reads an equation and than does a few things with it. But I m having trouble reading an equation. I tried :Prompt Y1 but I kept getting a data type error when I try to use the program. Does anyone have any ideas on how to accomplish this? Thanks in advance.

Answer 1

I m not sure if the TI-84 is the same, but on the 83 this will work if you put the equation in quotes when you enter it. So for example, using the following program:

PROGRAM:TEST
:Prompt Y1
:ClrDraw
:DispGraph

Running it:

prgmTEST
Y1=?"2X+1"

Will cause the graph for y=2x+1 to be drawn (and any other equations you already had entered at the time, IIRC).

Answer 2

Alternatively, you can do

:Input "Eqn:",Str1
:String>Equ(Str1,Y1)
:DispGraph

This way you don t have to put in quotation marks each time you enter an equation.

As noted by Timtech, there is an easier way of writing this.

:String►Equ(Str1,Y1
can be
:Str1→Y1
This replacement is universal, takes the same time to run (because it actually uses the same routines), is more convenient to type since you don t have to go through the command catalog, and is two bytes smaller.

Excerpt from the TI-Basic Developer Information Repository.

Answer 3

Texas Instruments has guide books online for some of their programmable calculators. Here s the PDF for the TI-84 plus: http://education.ti.com/guidebooks/graphing/84p/TI84PlusGuidebook_Part2_EN.pdf. Check out chapter 16 on programming.

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