Log key for ti-89

  • Calculators
  • Thread starter philipc
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  • #1
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Main Question or Discussion Point

I have a class where I'm using the log function a lot, I would like to program a hot key to display log on my ti-89 for I don't have to mess with the catalog, any suggestions?
Thanks
Philip
 

Answers and Replies

  • #2
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There isn't a nice key for base 10 logs. Use the change of base formula, using natural logs.

[tex]\log_{a}b=c[/tex]

[tex]a^c=b[/tex]

[tex]c=\frac{\ln b}{\ln a}[/tex]

EDIT: Sorry, you wanted to program a hotkey. I'm not familiar with how to do that, but I'm sure it's in the manual.
 
Last edited:
  • #3
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I know how to program the hot keys, but it displays only in the program window, if I can display it in the main window, I would be set. Any one know how to make a program display stuff in the main window?
Thanks
Philip
 
  • #4
if you want to use this function in calculations, a program isn't very helpful. I would suggest a user defined function. first,let me mention that I think log is in catalog, maybe you can move it to your custom menu. Anyways, what I do, is make a function that does the log base anything of anything. try this: define Logg(a,b)=ln(b)/ln(a) or you could do ln(b)/ln(a)-> Logg(a,b) (ps the '->' is the store button on your calculator. I think define is f4 or something, if you can't find it look in your catalogue)
 
  • #5
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Can you enlighten me on this custom menu stuff
Philip
 

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