Calculators Programming Hot Key for TI-89 Log Function

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To create a hotkey for the log function on the TI-89, users can utilize the change of base formula, which allows for calculations involving logarithms of different bases. Since there isn't a dedicated key for base 10 logs, the formula is expressed as c = ln(b)/ln(a). For practical use, programming a hotkey may not be effective, as it typically displays results in the program window rather than the main window. Instead, defining a user-defined function is recommended. This can be done by creating a function like Logg(a,b) = ln(b)/ln(a), which allows for more straightforward calculations. Additionally, users can explore moving the log function to a custom menu for easier access.
philipc
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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
 
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There isn't a nice key for base 10 logs. Use the change of base formula, using natural logs.

\log_{a}b=c

a^c=b

c=\frac{\ln b}{\ln a}

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.
 
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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
 
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)
 
Can you enlighten me on this custom menu stuff
Philip
 
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