e^x and ln(x)?

[Todd Kopriva]

Look in the JavaScript Math part of the expression language menu. There are Math.log and Math.exp methods there.

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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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[Darren Hardaway]

thanks, found it, but it didnt exactly work, probably because I’m trying to keep it too simple. Here was the idea:

On anchorpoint of layer:

X=(time*29.97)*2-99;
[X,100*Math.log((1/50)*(X+100))]

okay so I tried inverting this, and I think the invert is

X=(time*29.97)*2-99;
[X,Math.exp(.01*X)*50-100]

According to a TI-84 its pretty close, only the x-values are totally funky. Is there any way to call thisComp.width to determine the x values? I think thats what I’m looking for.

[Dan Ebberts]

What is it that you’re trying to do?

Dan

[Darren Hardaway]

hello….

I was trying to do something WAY redundant, basically I took about a half hour using a graphing calculator to find a path made with e^(x) that fit a 720×480 comp, then I found the inverse ln(x) function, then I stuck them in AE, and guess what? It didn’t work 😛 It’s okay tho, the path it made was easy enough to recreate by just warping the sin and cos(time) so it was really unneccessary to me, I was just experimenting. However, I was curious as to what logarithm and natural exponential functions can do for AE expressions, because I just got done with my intermed. algebra class and I’m wondering what else I can do with these cool little tools other than solve countinuous compound interest for money amounts I don’t have >_>