Logaritmic scale

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lorenzo.cioni
Senior Member
Posts: 102
Joined: Wed Jul 30, 2014 7:09 am
Vensim version: PLE

Logaritmic scale

Post by lorenzo.cioni »

Hi everybody
is there any way to have, in Vensim PLE, an x,y diagram with x in Ln scale? Please do not suggest to use Ln(x) sice it does not work... :lol:
I mean a true logaritmic scale...
All the best. 8)
Lorenzo
tomfid
Administrator
Posts: 3806
Joined: Wed May 24, 2006 4:54 am

Re: Logaritmic scale

Post by tomfid »

At present, you'd have to create a variable containing ln(x) and use that for the x axis of your custom graph.

We're currently reworking all the graphics, and this is definitely on the list for the future.
lorenzo.cioni
Senior Member
Posts: 102
Joined: Wed Jul 30, 2014 7:09 am
Vensim version: PLE

Re: Logaritmic scale

Post by lorenzo.cioni »

Hi tomfid
thank you for your (according to me wrong) answer... if ideed x spans over the interval (0,100) you get also negative values and not a logaritmic scale.
All the best.
Lorenzo
tomfid
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Re: Logaritmic scale

Post by tomfid »

I'm not sure what you mean. Log(0) is undefined and therefore won't be on any scale. Log(x) for x<1 is negative. So I guess you're referring to the scale labels, which you would like to read 0.01, .1, 1, 10, 100 rather than -2, -1, 0, 1, 2? Unfortunately there's no way to do that at the moment.
lorenzo.cioni
Senior Member
Posts: 102
Joined: Wed Jul 30, 2014 7:09 am
Vensim version: PLE

Re: Logaritmic scale

Post by lorenzo.cioni »

Hi tomfid
you hit the point....I suggest this as an extension for a future version of Vensim.
All the best.
Lorenzo
tomfid
Administrator
Posts: 3806
Joined: Wed May 24, 2006 4:54 am

Re: Logaritmic scale

Post by tomfid »

OK, thanks!
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