drawing a specific "plane" with scatterplot3d

On 31.07.2012 21:14, Duncan Murdoch wrote:

On 12-07-31 2:54 PM, Andras Farkas wrote:

Dear All,

using the example from the package scatterplot3d I created a 3d plot
as follows:

x <-rnorm(500,50,2)
y <-rnorm(500,5,1)
z <-rnorm(500,6,1)
scatterplot3d(x, y, z, highlight.3d=TRUE,
col.axis="blue",col.grid="lightblue", main="scatterplot3d - 1", pch=20)

I would like to ask if anyone could help me with the following:

1. I would like to draw  a plane across the plot that is paralell to
the bottom of the plot and is in the heights of the value 6 on the
axis "z", and goes across the plot

This is hard to do in scatterplot3d, because some points should be
hidden and others shown in front of such a plane, but scatterplot3d has
no way to do that.

No, but the human brain may help to make it not too hard a task:

s3d <- scatterplot3d(x[z<6], y[z<6], z[z<6], zlim=range(z),
      color="darkgrey", col.axis="blue",col.grid="lightblue",
      main="scatterplot3d - 1", pch=20)
s3d$plane3d(6, 0, 0)
s3d$points3d(x[z>=6], y[z>=6], z[z>=6], pch=20)

Best,
Uwe ligges




You could do it using the rgl package; the commands

there would be something like this (without the coloring you did in
scatterplot3d):

plot3d(x,y,z)
planes3d(0,0,-1,6,col="red")

2. Is there a way to color all plotted values with the "z" variate
less than the value of 6 one color, and all the rest another color?

In rgl you would do it using

plot3d(x,y,z, col=ifelse(z < 6, "blue", "red"))

I think the same sort of thing works in scatterplot3d, but the arg name
is color, not col.

Duncan Murdoch

I would greatly apreciate the help on this,

Sincerely,

Andras
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On 12-08-01 8:42 AM, Uwe Ligges wrote:

On 31.07.2012 21:14, Duncan Murdoch wrote:

On 12-07-31 2:54 PM, Andras Farkas wrote:

Dear All,

using the example from the package scatterplot3d I created a 3d plot
as follows:

x <-rnorm(500,50,2)
y <-rnorm(500,5,1)
z <-rnorm(500,6,1)
scatterplot3d(x, y, z, highlight.3d=TRUE,
col.axis="blue",col.grid="lightblue", main="scatterplot3d - 1", pch=20)

I would like to ask if anyone could help me with the following:

1. I would like to draw  a plane across the plot that is paralell to
the bottom of the plot and is in the heights of the value 6 on the
axis "z", and goes across the plot

This is hard to do in scatterplot3d, because some points should be
hidden and others shown in front of such a plane, but scatterplot3d has
no way to do that.

No, but the human brain may help to make it not too hard a task:

s3d <- scatterplot3d(x[z<6], y[z<6], z[z<6], zlim=range(z),
      color="darkgrey", col.axis="blue",col.grid="lightblue",
      main="scatterplot3d - 1", pch=20)
s3d$plane3d(6, 0, 0)
s3d$points3d(x[z>=6], y[z>=6], z[z>=6], pch=20)

Nice solution.  Generally speaking scatterplot3d graphs reproduce better
than rgl graphs (since they use the regular graphics devices), so it's
worthwhile using them when you can.

Duncan Murdoch

Best,
Uwe ligges




You could do it using the rgl package; the commands

there would be something like this (without the coloring you did in
scatterplot3d):

plot3d(x,y,z)
planes3d(0,0,-1,6,col="red")

2. Is there a way to color all plotted values with the "z" variate
less than the value of 6 one color, and all the rest another color?

In rgl you would do it using

plot3d(x,y,z, col=ifelse(z < 6, "blue", "red"))

I think the same sort of thing works in scatterplot3d, but the arg name
is color, not col.

Duncan Murdoch

I would greatly apreciate the help on this,

Sincerely,

Andras
     [[alternative HTML version deleted]]