Post your ideas for new math programs here, or build on ideas posted by other visitors.

Sorry for my english... i'll do as much as i can...
I'm trying to programm something that print's on screen a "webcob"-plot... I don't know how to print a graphic of a function f(x) {for ex. sin(x)} passed to the program on the command line. I've tried with graf f,x with drawfun but nothin' appens. I don't even know if i've got to define the x, the indipendent variable or not... PLEASE HELP ME

First, define the function you want to graph as a variable (usually y1). Then call:

Graph y1(x)

Hello !
I have just finished a program solver for simplex method problems and I would like to know if someone could try to develop it further. In fact it is just adapted to maximisation and it would be more efficient if it could solve every simplex problems !
Thanks!
Robin

hey can anyone walk me through any trig programs? i am mainly looking for trig ratios if posible. e-mail me or im me on msn if u can. thanks

srry my e-mail is nate1288@msn.com and my msn messenger is the same thing.

anyone at all? or is it possible? or anything, and you would have to walk me through it if it is, cus i don't have a computer link., or does anyone even think htey r good enough to moake this?

What specific ratios? Identities? Formulas? Calculus/trig relations? What do you need, specifically?

im new to programming calcs... but i visit this site regularly and i was wondering if it was possible to create a prog that hid all of your programs from the "program" menu. for example if you teacher comes up during your final exam and wants to see your calc... is it possible to hide your programs? i know there is alot of password protecting progs out there but that would just make a teacher more suspicious... if anyone knows of one or could make one please respond! -thanks

Surprising that nobody answered... Anyway, I own an 83+ and found a nifty program for it under Asm-miscellaneous called Z-Dos that does that and more. If you have a different calc. I cannot help.

hey, have you found a program to do what you want? If you didn't e-mail me at bunchofstuff@aol.com i could make one for you.(only for the ti-83, and ti-83 plus though.)

In addition to the 83+ one mentioned by miscellaneousprogrammer, I have also had one for the 89...I found it in the 89 ASM misc. Programs directory. If you need one for the 89 and can't find it, I'll email it to you or give a link to it...

If you want to hide games on a TI-83+/SE, I know you can use MirageOS. Just open it up (the app) and choose a game you want to hide and hit the COS( key. Alternatively, you can hide/unhide all the programs in your MAIN folder. To do this, hit the PRGM key. Then hit the Y key to accept.
To view your hidden programs in MirageOS, you'll need to hit ALPHA to go to the options screen, hit enter once to see the main options, hit the down arrow key once to select "Show Hidden Files" and hit enter to add an X mark to the box. Then hit clear twice to return to the main screen.
Unhiding your programs is the same process in reverse. Just open up Mirage, choose the program, and hit the COS( key once to unhide. Or hit PRGM to unhide all.

Do you guys have or know of any program that will hide other programs, even after they end the program? If that is not possible, do you know of any programs that will hide your programs, like what z-dos does, but not with the same interface as z-dos?
tim0808@rushpost.com

Hey A friend and me are developing a PI program for calculating Pi and we have a version now which is working. But two things are wrong: the floating point variables are only 16 decimals long and the formula we currently use is pretty slow. We think that the formula stuff should be fairly easy to solve, but the float stuff is not. Please help us out.
zxmaster@clanpogo.tk

hi zx

I've been working on a calculator program for some months now, I now a method, derived from commonly known CORDIC algorithm to calculate PI. Maybe that is what you are looking for?

This one is pretty fast. I forgot the formula I used, so I'll just give you the code.

1 -> A
3 -> B
0 -> D
1 -> E
While 1=1
Output(1,1,2 root(3)(1-D
1/((3^A)B -> C
If E=1
Then
D+C -> D
2 -> E
Else
D-C -> D
1 -> E
End
A+1 -> A
B+2 -> B
End

I put a space before and after the "->" so it wouldn't look like subtraction.
I believe this is the equation that has to do with the infinite fraction thing. Not sure though.

I don't entirely know what you need to calculate pi for but an easy way to do it without geting into some crazy programs is to just graph it. the equation 180/x (sqroot((cos(x)-1)^2+(sin(x))^2)) will give you pi to essentially as many places as you want. you just need to go into the table and set it to start at like 1.0^-13 or so because as x approaches 0, y approaches pi

I'm writing a program that using a menu, gives the different r and r2 values for different combinations of x, y, sq rt of x or y, log of x or y, 1/x and 1/y to find linear relationships in quadratic data sets. I found that problem that keeps me from using the program though. The function LinReg(a+bx) only works if it is the *last* command in the entire program. Thus, I can't have it do more than one LinReg in the program. (Goto STAT, -> Calc, 8 for LinReg(a+bx) ). Anyone know a way around this? Thanks

well, I searched google a while back and found the method in which TI calculates it's regressions...I don't remember exactly what they were...maybe you could try such a search...good luck!

I found a program that I made a few weeks ago...it calculates an Nth degree polynomial regression from a list of data points. I will upload it to TICALC.ORG soon, but if you need it sooner than that, email me at jrock7286@aol.com and I will send it to you along with a text file of the program if you don't have a cable. Hope this will help you

Forgot to mention...for the nth degree polynomial, in your case you would just enter one as the degree (to get a linear equation). Also, if you EMail me, make sure you put "TICALC MEMBER" or something like that in all caps in the subject to make sure I don't delete it...

n/m guys, thought of a way around it that should've been obvious to me from the start. My solution has the user punch in the transformation they want then it goes to the appropriate Label, which sends the transformed list 1 and 2 into list 3 and 4 then sends it the the visual label. That label shows the scatter and resid graph, then the last line is the LinReg. Works and saved mem space!