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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87311] Re: What determines #1 and #2 values (with &) for ContourLabels?
  • From: dh <dh at metrohm.ch>
  • Date: Mon, 7 Apr 2008 05:17:59 -0400 (EDT)
  • References: <fta9i4$e62$1@smc.vnet.net>


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.pajenn 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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