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1. ## Math Question

And I really should know this....

I'm testing a charting feature to one of our applications. In the options I can set a chart's axis to be exponential and I can set it to be logarithmic.

These options are currently checkboxes. Should they be mutually exclusive? The log of an exponent is the original number??? I forget... it's been too long.

Thanks.

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WinAmp. Llama Tested. Mother Approved.
Jordan Gottlieb
President, Charlotte Mercury User Group
Qualitech Solutions, Inc.
jgottlieb@qualitechsolutions.com

2. ## Re: Math Question

Jordon,
http://www.math.utah.edu/~alfeld/math/log.html

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Simple minds, Simple thoughts!

Doug

3. ## Re: Math Question

Let's see... (considering the natural logaritm)

if we consider:

f1(x)=e^x
f2(x)=ln(x)

then:

f12(x)=f1(f2(x)) = e^ln(x)

ln(f12(x))= ln(e^ln(x))= ln(x)*ln(e)=ln(x)
=> f12(x)=x

f21(x)=f2(f1(x)) = ln(e^x)= x*ln(e)=x

so, you're right !

e^ln(x) = ln(e^x)= x (q.e.d.)

Not so long... this year I had the 20 years meeting from the high school graduation.

It may sound strange, but one of my hobbies was ... "math".

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If you need a reason to be happy - FIND IT, don't wait it !

4. ## Re: Math Question

This is all based on the assumption that you are referring to log of the same base

eg: e^x and log x
:...................e

I used to calulate this stuff using a slide rule and/or tables

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Robert Tehve
rtehve@bigpond.com

[This message has been edited by rtehve (edited 10-08-2002).]

[This message has been edited by rtehve (edited 10-08-2002).]

[This message has been edited by rtehve (edited 10-08-2002).]

[This message has been edited by rtehve (edited 10-08-2002).]

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