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  Topic: Function/Program Catalog Help Window Text
mellamokb

Replies: 1
Views: 595

PostForum: BASIC Programming   Posted: March 8, 2011 9:58 PM   Subject: Function/Program Catalog Help Window Text
Hi KrazyKaveman,

I do not believe that is possible. However, you might try some workarounds.

Create a help() function that displays the functions and expected parameters when you pass in your c ...
  Topic: Overlaying graphs of functions on the Ti 89 titanium
mellamokb

Replies: 1
Views: 457

PostForum: General Discussion   Posted: March 8, 2011 9:47 PM   Subject: Overlaying graphs of functions on the Ti 89 titanium
Hi davetheant,

I don't know of a way to show graphs from multiple graphing modes at the same time on the TI-89. However, you could try some workarounds.

For instance, you could try saving an im ...
  Topic: Simultaneous Equation Solver - Using Complex Numbers
mellamokb

Replies: 2
Views: 1492

PostForum: General Discussion   Posted: February 15, 2011 9:39 AM   Subject: Simultaneous Equation Solver - Using Complex Numbers
Hi Marco,

Just to add an update. I experimented with plugging in the answers you expected into the original equations. I get a different answer than the equations, meaning the answer you are expe ...
  Topic: Simultaneous Equation Solver - Using Complex Numbers
mellamokb

Replies: 2
Views: 1492

PostForum: General Discussion   Posted: February 15, 2011 9:34 AM   Subject: Simultaneous Equation Solver - Using Complex Numbers
Hi Marco,

Solving complex number equations should be no problem for the TI-89. I tried the problem myself using the built-in csolve (complex solve) function:


csolve((4+2i)x + ( ...
  Topic: programming equations
mellamokb

Replies: 1
Views: 1817

PostForum: Assembly Programming   Posted: February 14, 2011 4:08 PM   Subject: programming equations
Hi idahoskeeter,

There is some basic information about programming on the site here:

http://www.ti-89.org/programs.html

Also, there is a link on that page to the TI-89 Programmer's reference. ...
  Topic: Help with linear eqaution
mellamokb

Replies: 1
Views: 399

PostForum: General Discussion   Posted: February 14, 2011 10:26 AM   Subject: Help with linear eqaution
Hi SWANSON,

Try entering it like this:


solve( a / b <= 0, x) | a = (3x-1)(4x+5) and b = (x+7)(1-2x)



Sometimes breaking up the problem into pie ...
  Topic: Having problems running games on preos for my ti-89 titanium
mellamokb

Replies: 1
Views: 434

PostForum: General Discussion   Posted: February 14, 2011 10:23 AM   Subject: Having problems running games on preos for my ti-89 titanium
Hi fabliftedranger,

You might have better luck with DoorsOS. Look at the games how-to page here:

http://www.ti-89.org/gamesfaq.html

Hope this helps!

Regards,
~ mellamokb
  Topic: How to Graph a line in the form x=n
mellamokb

Replies: 1
Views: 658

PostForum: Math   Posted: February 14, 2011 10:21 AM   Subject: How to Graph a line in the form x=n
Hi lordb,

In normal FUNCTION graphing mode, you can't graph a line in terms of x. However, in PARAMETRIC mode (
xt1 = n
yt1 = t



You can also graph a function in the form of y = f(x) in pa ...
  Topic: Help! Chemistry Program.
mellamokb

Replies: 1
Views: 1092

PostForum: BASIC Programming   Posted: February 10, 2011 3:44 PM   Subject: Help! Chemistry Program.
Hi thatguy69,

It looks like you can't solve for an undefined local variable. Try using another variable name for the one being solved. For instance, the first expression would look something like ...
  Topic: Indirection Problems
mellamokb

Replies: 3
Views: 794

PostForum: BASIC Programming   Posted: February 10, 2011 3:33 PM   Subject: Indirection Problems
Hi ghost ROM,

I just might add, that it might be easier to run your program in a separate folder, and forget about trying to define local variables. Allow the variables to be global, and if they a ...
  Topic: Missing Start/End Qualifiers
mellamokb

Replies: 1
Views: 548

PostForum: BASIC Programming   Posted: February 10, 2011 3:25 PM   Subject: Missing Start/End Qualifiers
Hi redmann11,

I think you need a matching EndFor for your For loop. My guess would be it belongs just above the statement that reads

Disp "simpson rule"

Hope this helps!

Regards ...
  Topic: differentiating with e^x function
mellamokb

Replies: 1
Views: 668

PostForum: Math   Posted: February 10, 2011 3:22 PM   Subject: differentiating with e^x function
Hi MadMax,

When doing approximations on a TI-89, e gets evaluated as part of the expression, as though it were the number 1.7281828..., instead of some variable or function. If you enter in exact ...
  Topic: Trigonometric functions
mellamokb

Replies: 1
Views: 791

PostForum: Math   Posted: February 10, 2011 3:18 PM   Subject: Trigonometric functions
Hi panzerbase,

The TI-89 should be able to simplify your trig expression if it has a readily-available simpler form. Verify that you are in Radian mode (MODE -> angle), as that sometimes makes ...
  Topic: TI 89 WON'T SQUARE ROOT PROPERLY, PLEASE HELP!
mellamokb

Replies: 1
Views: 960

PostForum: Math   Posted: February 10, 2011 3:15 PM   Subject: TI 89 WON'T SQUARE ROOT PROPERLY, PLEASE HELP!
Hi santinofil,

What mode is your calculator in (MODE -> Exact/Approx)? In exact mode it won't evaluate decimal roots.

You can also get a decimal result by pressing DIAMOND+Enter.

Hope thi ...
  Topic: How to Define Multiple Variables
mellamokb

Replies: 2
Views: 800

PostForum: Math   Posted: February 10, 2011 3:13 PM   Subject: How to Define Multiple Variables
Hi hand.jamie,

You can specify multiple variables using "and":

x-y|x=1 and y=2

Hope this helps!

Regards,
~ mellamokb
 
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