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Re: What determines #1 and #2 values (with &) for ContourLabels?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87345] Re: What determines #1 and #2 values (with &) for ContourLabels?
  • From: mr.pajenn at gmail.com
  • Date: Tue, 8 Apr 2008 05:37:18 -0400 (EDT)
  • References: <fta9i4$e62$1@smc.vnet.net> <ftcovh$ktr$1@smc.vnet.net>

I'm trying to understand how #1 and #2 values are chosen because they
often position the labels badly for certain types of contour plots
(straight lines or curves for example), so I want to offset them
slightly, but I first need to know what the values will be first.

On Apr 7, 5:19 am, dh <d... at metrohm.ch> wrote:
> Hi,
>
> the manual says: ContourLabels->f specifies that the label for each
>
> contour should be f[x,y,z]. But I could nowhere find the meaning of
>
> x,y,z. By trying I found that x and y are the coordinates of the
>
> position where ContourPlot would like to place the label. And z is
>
> either the equation given to ContourPlot or the value of the contour
>
> line if a function is spezified.
>
> hope this helps, Daniel
>
> mr.paj... at gmail.com wrote:
> > Here's the example of a ContourPlot:
>
> > {i = 0, j = 0};
>
> > ContourPlot[{x == 4 + y/4, y == 2 + x/2}, {x, 0, 10}, {y, 0, 10},
> >  ContourLabels -> (Text[#3, {val1[i += 1] = #1, val2[j += 1] = #2}]
> > &)]

>
> > Print[{val1[1], val2[1], val1[2], val2[2]}]
>
> > The output is a basic plot with two lines, and I've set it to record
> > and print the values of  #1 and #2 arguments, which are:
> > val1[1] =  6.4857
> > val2[1] = 9.9429
> > val1[2] = 0.095238
> > val2[2] = 2.0476
>
> > I'd like to know where those values came from so that I can apply the
> > #1 and #2 arguments intelligibly.
>
> > Thanks in advance.



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