       RE: Reverse the vertical axis

• To: mathgroup at smc.vnet.net
• Subject: [mg29254] RE: Reverse the vertical axis
• From: "David Park" <djmp at earthlink.net>
• Date: Fri, 8 Jun 2001 04:15:38 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Here is a sample function for a coutour plot.

f[x_, y_] := y^2*Sin[x]

This is the regular contour plot with y increasing in the upward direction.

ContourPlot[f[x, y],
{x, 0, Pi}, {y, 0, 1},
ColorFunction -> Hue,
FrameLabel -> {x, y}];

This is the same function plotted with y increasing in the downward
direction. We had to change the sign of y in the function and the domain,
and we had to use the FrameTicks option to relabel the y axis.

ContourPlot[f[x, -y],
{x, 0, Pi}, {y, -1, 0},
ColorFunction -> Hue,
FrameLabel -> {x, y},
FrameTicks -> {Automatic,
Table[{y, -y},
{y, 0, -1, -0.2}],
Automatic, Automatic}];

David Park

> From: goyteck at hotmail.com [mailto:goyteck at hotmail.com]
To: mathgroup at smc.vnet.net
>
>
> Dear all,
>
>    I would like to know if there is a way to present the y-axis of a
> contour plot to increase vertically downward, instead of vertically
> upward as it usually does.  That mean that I wish to have the plot of
> the following form
>
>
>      ----------------> x
>     |
>     |
>     |
>     |
>     |
>    \ /
>     y
>
>
>      Thank you for helping.  Have a nice day.
>
>
> Goy Teck Lim
>

```

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