Math Help Forum - Calculator Discussion

ti 89 help

saltflat — Wed, 18 Nov 2009 19:33:19 GMT

I cannot figure out how to input a cube root into this calculator. I can do it with my ti 83 but it converts it into decimals. I need the cube root in front of the square root sign.

A useful HP-50G program to keep the DIRs clean...

Bill Zimmerly — Thu, 12 Nov 2009 19:15:05 GMT

Everyone has their personal preferences for organizing their homes, rooms, offices, etc. - even the directories and files on personal computers. I am a neat freak and like things to be highly organized. The way in which the directories and objects on my HP-50G are organized makes it easy for me to locate important things.

I like every directory from HOME on down to be organized like this: alphabetically with directories first and all other objects afterwards.

I like programs to clean up after they are run by making sure that the flags are restored to their pre-run state and I want the VAR menu to always be displayed.

I'm also an automation freak. On my Linux workstations, I have a collection of useful scripts that I wrote that make working with the system very easy. Likewise so for my HP-50G, I have written a series of useful programs that keep things organized the way I like them.

Here is a program I wrote (that resides in HOME) to relist all directories and objects to my liking. I'm posting it here so others may find usefulness with it too...

<<
"Relisting the Directory..." 1. DISP
{} DUP 'xA' STO 'xB' STO
VARS OBJ-> 1. SWAP
START
DUP 1. ->LIST SWAP VTYPE
IF 15. ==
THEN xA + 'xA' STO
ELSE xB + 'xB' STO
END
NEXT
xA SORT xB SORT + ORDER
{xA xB} PURGE 2. MENU
>>
'ReList' STO

I have it in the HOME's CST list, so it can run in any subdirectory and clean up whatever is the "current" directory.

P.S. Nobody is perfect, so I welcome suggestions for improvement. :)

Any Casio Classpad experts out there?

Debsta — Sun, 08 Nov 2009 13:16:15 GMT

I posted an earlier thread but haven't had any replies yet. Does anyone know if you can graph straight from the financial menu on a classpad? Please.

Reducing balance loan graph on Classpad

Debsta — Thu, 05 Nov 2009 10:34:09 GMT

Hoping someone can help. I have just entered details of a reducing balance loan in the Amortization section of the Financial TVM menu. I am wanting now to draw the graph of the progress of the loan. I am hoping I can do this from this screen rather than switch to Graph&Table screen and have to type in the annuity formula. Any ideas?

How do I make a TI-89 macro?

Wolvenmoon — Wed, 04 Nov 2009 21:47:28 GMT

Hi,

I'm wanting to set up a macro for my calculator that lets me define domain for values of X when I solve a problem.

Instead of having to type |x>=0 and x<=whatever, I want to have it hotkeyed to just drop that in whenever I hit a combination of buttons.

How do I do this?

EDIT: I'd also like to be able to set domain of my trigonometric functions, but don't know the syntax for that.

TI-89 Differentiation and Integration (errors)

Chizum — Wed, 04 Nov 2009 03:59:37 GMT

I occasionally get unorthodox answers for differentiation and integration on the TI-89.

For instance, if I differentiate tan(x) in terms of x I get: pi/180(cos(x))^2

Anyone know how to fix this? For the exact/approximate option I've got "auto" selected.

Find closest parabola to given points in plane

mg42 — Tue, 03 Nov 2009 13:54:10 GMT

You have N given points in plane and you have to find some a, b, c so that sum of |f(xi) - yi| will be minimum with i from 1 to N and f(x) = a * x * x + b * x + c.

I need an algorithm for this.

Thank you in advance

TI 89 Graphing

JohnDoe — Sun, 01 Nov 2009 23:26:05 GMT

Hello everyone,
I wonder if it is possible to graph |x|+|y|=x^2+y^2 function on TI89 Titanium if so can someone please provide me step-by-step instructions because I always get stuck with the "Undefined Variable" error. No matter what I have done I could not manage to solve the problem. Thanks for your contribution.

Laplace/ partial fraction calculations

ferroburak — Sat, 31 Oct 2009 19:26:38 GMT

Hi,

Is there any calculator that can perform Laplace/ partial fraction calculations?
(I have an aged casio 9750g)

Thanks in advance.

Classpad "Incorrect Argument"

Debsta — Sat, 24 Oct 2009 12:41:56 GMT

Can anyone help with this please? I am trying to find derivatives and indefinite integrals on my Casio Classpad. I am entering it correctly, but it now keeps telling me "Incorrect Argument". I have done heaps of these before with no problems. It is in Alg mode. When I put it in Assist mode, it works. Shouldn't it be the other way around???? Today I downloaded the new OS. Could this be the problem?