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Orftintain
Joined: 29 Sep 2006
Posts: 1
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 Posted: April 14, 2007 2:04 PM Post subject: log mean / Interpolation |
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Two Questions: They are both How / Can I do a..on TI89
1) Log mean - Is there a function to return it ?
Has someone posted the programing code to make one ?
ie ..Log ( a,b) = ans,
where ans = (a - b ) /(log(a/b)
2) Linear Interpolation
Is there a function to return it ?
Has someone posted the programing code to make one ?
ie given two points , assume a line, give third coordinate, find it's matching value on that line...
I know this fuction comes preprogrammed into the 85 but I can't find it on the 89....
I do these a-lot and would like to program them into my calculator..
(if necessary)
I have basically zero programming experience and no computer calc cable..
Thanks |
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mellamokb
Joined: 10 May 2007
Posts: 100
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| Posted: May 17, 2007 10:20 PM Post subject: |
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Hi Orftintain,
There aren't built-in functions for the operations you describe, but you can build your own using the function editor or the home screen. Try these (on the home screen):
| Code: |
Define logmean(a,b)=(a-b)/log(a/b)
Define linterp(ax,ay,bx,by,cx)=ay+((cx-ax)/(bx-ax))(by-ay)
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ax=x-coordinate of first point
ay=y-coordinate of first point
bx=x-coordinate of second point
by=y-coordinate of second point
cx=x-coordinate of point being interpolated
The output will be the y-coordinate corresponding with cx on the line defined by (ax,ay) and (bx,by).
Now just use "logmean(" and "linterp(" with valid parameters to do your repetitive calculations.
Hope this helps!
~ mellamokb |
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