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Re: Logarithmic Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96351] Re: Logarithmic Plot
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Thu, 12 Feb 2009 06:35:23 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <gmu8ma$ghu$1@smc.vnet.net>

In article <gmu8ma$ghu$1 at smc.vnet.net>,
 Ben Casey <ben.a.casey at gmail.com> wrote:

> Hi, I could use some help.  Basically I have imported a set of data points 
> (concentration of compound vs. time) and plotted it in Mathematica.  Part of 
> my assignment now is to post the Log[concentration] vs. time.  Is there an 
> easy command to do this in Mathematica?  I've played around and looked in the 
> doc center but the only way I can figure to do it is manually calculate the 
> values and then plot them.  There must be a better way.

The function you are looking for is called *ListLogLinearPlot* (at least 
in Mathematica 6.xx and above). It belongs to a whole family of 
functions designed to automatically convert the x-, y-, or both, data to 
logarithmic scales. (Note that w/o the List prefix, the same plotting 
functions exist for drawing expressions.) For instance,

    data = Table[{n, Sqrt[n]}, {n, 100}];
    
    ListPlot[data]           (* regular x, regular y *)
    ListLogPlot[data]        (* log x, regular y *)
    ListLogLinearPlot[data]  (* regular x, log y *)
    ListLogLogPlot[data]     (* log x, log y *)

Regards,
--Jean-Marc


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