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

• To: mathgroup at smc.vnet.net
• Subject: [mg87296] Re: [mg87269] What determines #1 and #2 values (with &) for ContourLabels?
• From: Carl Woll <carlw at wolfram.com>
• Date: Mon, 7 Apr 2008 05:15:09 -0400 (EDT)
• References: <200804061042.GAA14384@smc.vnet.net>

```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, val2, val1, val2}]
>
>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 =  6.4857
>val2 = 9.9429
>val1 = 0.095238
>val2 = 2.0476
>
>I'd like to know where those values came from so that I can apply the
>#1 and #2 arguments intelligibly.
>
>
>
>
From the help for ContourLabels:

ContourLabels->f specifies that the label for each contour should be
f[x,y,z].

So, #1 is x, #2 is y, and #3 is z.

Carl Woll
Wolfram Research

```

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