Re: Where does the 'z' come from?
- To: mathgroup at smc.vnet.net
- Subject: [mg105415] Re: Where does the 'z' come from?
- From: Szabolcs Horvát <szhorvat at gmail.com>
- Date: Tue, 1 Dec 2009 06:27:58 -0500 (EST)
- References: <hf2msf$iel$1@smc.vnet.net>
On 2009.12.01. 10:15, Lawrence Teo wrote:
> Mathematica v7.0 has this sample for ContourPlot[]
>
> ListContourPlot[
> Table[Sin[x] Sin[y], {x, -3, 3, 0.1}, {y, -3, 3, 0.1}],
> ContourLabels ->
> Function[{x, y, z}, Text[Framed[z], {x, y}, Background -> White]]]
>
> Where does the z come from?
> Can I say that the x and y come from the iteration by Table[]?
> Is z an implicit variable?
>
The symbols x,y,z in the Function[...] have absolutely nothing to do
with the x and y in Table[...]. x,y,z are local to Function and x,y are
local to Table. The following is completely equivalent to the example
from the docs:
> ListContourPlot[
> Table[Sin[i] Sin[j], {i, -3, 3, 0.1}, {j, -3, 3, 0.1}],
> ContourLabels ->
> Function[{a, b, c}, Text[Framed[c], {a, b}, Background -> White]]]