TI 89 Programming

This is a discussion on TI 89 Programming within the A Brief History of Cprogramming.com forums, part of the Community Boards category; I need to know if there is a way on the TI89 to input a fxn through a program and ...

  1. #1
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    TI 89 Programming

    I need to know if there is a way on the TI89 to input a fxn through a program and have that fxn go into the y editor.

    ex: if i were to enter 1 + x; 1 + x would go into y1.

    I know this can be done on the TI83Plus, and am trying to find a way to do this with the TI89.
    on the TI83, I can do
    Code:
    Input "",Y1
    but trying to do this on the TI89 gives me an error:
    Code:
    Input "", y1 or Input"", y2
    I need to write this program for both calculators.

    Unless, there is a way to do it on both calculators to enter a fxn such as:

    dy
    __ = x + y
    dx

    and be able to plug in x and y^2.

    This is for Euler's method.

    I don't want to program it as a flash app, as I would need a TI83 counterpart, and a similar program to both would be nice.

    Thanks.

    edit: All I really need to know is how to enter something and place it in y1

  2. #2
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    I used to program on a TI83Plus and inputting "32+a" as input
    is completely legal. Not sure on a TI89, You could program it
    in assembly.

  3. #3
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    That is where the problem lies. I don't really know assembly, and for some reason, I cannot get the SDK to run correctly on WinXP. Also, the Graph Link software is not compatible with the Graph Link USB.

    It really is just the TI89 that I need to know how to do. I pretty much have the TI83 programmed, and it works. But the TI89 is giving me "variable name" errors.

  4. #4
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    You should have recieved a very VERY thick manual (i have one ), In wich all the programming keywords are listed, Theyre use and effects.

  5. #5
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    I did, it doesn't say anything about it in there.

    I actually just ran into a problem with the TI83.

    I'm trying to program Euler's Method.
    The equation is

    Code:
    Yn = Yn-1 + f(Xn-1,Yn-1)Dx
    where D stands for delta.

    Now the problem resides in being able to do:
    Code:
    dy
    ___ = x + y
    dx
    How would I be able to enter this in, be able to solve an iteration such as (with X0 = 2, Y0 = 1); and x goes to 2.5 with 5 iterations:
    Code:
    Y1 = Y0 + (X0 + Y0)Dx
    Y1 = 1 + (2 + 1).1
    I don't know if this is possible.

    Thanks.

  6. #6
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    not sure but I think you could do something along the lines of store the string. Then use Define Yn(x)=STRING
    because when you type an equation into the y1= field the calculator just calls Define y1(x)=blah. Try typing an invalid equation into y1 and see the error you get.
    Proud to be a gun carrying, freedom loving, libertarian
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  7. #7
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    Thanks for the help. I just changed my algorithm a bit. It works for both calculators.

    For the TI89, I just made it to where the user must enter the equation first.

    Thanks for the help Travis and Dalren.

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