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Math.pow(Math.E, time)

Jun 5, 2012 2:34 PM

Tags: #error #time #zero #divide #power #expression #exponential #math.pow

Hi folks!

 

The expression

 

"Math.pow( Math.E, time )" keeps giving me a "divide by zero" error.

 

This seems to be similar to problems others have had, but the other solutions don't quite work in my case, since Math.E isn't negative.  "time" of course is a non-integer, but the expression doesn't even work for me if I replace it with "Math.ceil(time)." 

 

Can anybody tell me what I'm missing?  Thanks in advance!

 

--S

841 Views   4 Replies   Latest reply: _,~\'`-._, Jun 6, 2012 9:14 PM
 
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  • Dan Ebberts
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    1. Dan Ebberts,
    Jun 5, 2012 3:17 PM   in reply to _,~\'`-._
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    I don't get that error. Is that your entire expression? Do you get it with Math.exp(time)?

     

    Dan

     
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  • _,~\'`-._
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    2. _,~\'`-._,
    Jun 5, 2012 3:23 PM   in reply to Dan Ebberts
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    Thanks for the reply!

     

    My original expression was

     

    thet = time;

    a = 2;

    b = 0.5;

    exp = Math.pow(Math.E, b*thet);

    posx = a*exp*Math.cos(thet);

    posy = a*exp*Math.sin(thet);

    [640, 640] + [posx, posy]

     

    except that a and b were slider values.  If I use Math.exp,

     

    thet = time;

    a = 2;

    b = 0.5;

    exp = Math.exp(b*thet);

    posx = a*exp*Math.cos(thet);

    posy = a*exp*Math.sin(thet);

    [640, 640] + [posx, posy]

     

    I get the same error.  I found a work-around by attaching theta to a slider instead, but I'm still curious to know what the problem was.

     

    Thanks again!

     

    --S

     
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  • Dan Ebberts
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    3. Dan Ebberts,
    Jun 5, 2012 3:35 PM   in reply to _,~\'`-._
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    I can get that error if my slider for b goes above 44, but at 44 the expression is generating some ridicuously huge numbers, so there's probably some kind of JavaScript overflow going on.

     

    Dan

     
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  • _,~\'`-._
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    4. _,~\'`-._,
    Jun 6, 2012 9:14 PM   in reply to Dan Ebberts
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    Hmm.  Yes, it might be a memory problem on that computer.  It works fine on a faster one.

     

    Thanks for the help!

     

    --S

     
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