MATLAB Central Newsreader - plot3 with color according to z-value?

plot3 with color according to z-value?

jdellanna@web.de — Wed, 05 Nov 2008 10:22:54 -0500

Hi there!
I want to plot a pack of data with structure [x(i) y(i) z(i)] in a way
that the color changes specified by the z-values. I tried already
plot3, surf, surface, mesh and scatter3. With plot3 the data are
displayed in the way I want, but not with changing color. And with
surf, surface, mesh and scatter3 I get changing color, but the x- and
y- axis values are no more according to the x(i) and y(i) coordinate
values but seem to be the index i, so that the projection of the
surface I define with all those xyz-pairs to the x-y-plane is no more
shaped like a rhomb with the correct x,y-values, but a full square
with the number of data pairs as x- and y-values. The optimum for me
would be if I could just change the color in plot3 from single-color
to z-value-dependent. Is that possible? What can I do?
Thanx for your support :-)
Jazz

Re: plot3 with color according to z-value?

Wolfgang Schwanghart — Wed, 05 Nov 2008 10:35:03 -0500

This might be what you are searching for:
http://www.mathworks.com/matlabcentral/fileexchange/14677

Best regards,
Wolfgang

jdellanna@web.de wrote in message <db855997-a73b-4230-83a8-e6a152e8d56e@q30g2000prq.googlegroups.com>...
> Hi there!
> I want to plot a pack of data with structure [x(i) y(i) z(i)] in a way
> that the color changes specified by the z-values. I tried already
> plot3, surf, surface, mesh and scatter3. With plot3 the data are
> displayed in the way I want, but not with changing color. And with
> surf, surface, mesh and scatter3 I get changing color, but the x- and
> y- axis values are no more according to the x(i) and y(i) coordinate
> values but seem to be the index i, so that the projection of the
> surface I define with all those xyz-pairs to the x-y-plane is no more
> shaped like a rhomb with the correct x,y-values, but a full square
> with the number of data pairs as x- and y-values. The optimum for me
> would be if I could just change the color in plot3 from single-color
> to z-value-dependent. Is that possible? What can I do?
> Thanx for your support :-)
> Jazz

Re: plot3 with color according to z-value?

Jasmin DellAnna — Wed, 05 Nov 2008 13:37:01 -0500

Thanx alot!! That's exactly what I was looking for :-)
Best regards,
Jazz

"Wolfgang Schwanghart" <schwanghartremove.this@googlemail.com> wrote in message <gerssn$3eh$1@fred.mathworks.com>...
> This might be what you are searching for:
> http://www.mathworks.com/matlabcentral/fileexchange/14677
>
> Best regards,
> Wolfgang
>
>
> jdellanna@web.de wrote in message <db855997-a73b-4230-83a8-e6a152e8d56e@q30g2000prq.googlegroups.com>...
> > Hi there!
> > I want to plot a pack of data with structure [x(i) y(i) z(i)] in a way
> > that the color changes specified by the z-values. I tried already
> > plot3, surf, surface, mesh and scatter3. With plot3 the data are
> > displayed in the way I want, but not with changing color. And with
> > surf, surface, mesh and scatter3 I get changing color, but the x- and
> > y- axis values are no more according to the x(i) and y(i) coordinate
> > values but seem to be the index i, so that the projection of the
> > surface I define with all those xyz-pairs to the x-y-plane is no more
> > shaped like a rhomb with the correct x,y-values, but a full square
> > with the number of data pairs as x- and y-values. The optimum for me
> > would be if I could just change the color in plot3 from single-color
> > to z-value-dependent. Is that possible? What can I do?
> > Thanx for your support :-)
> > Jazz

Re: plot3 with color according to z-value?

russell.fung@gmail.com — Wed, 05 Nov 2008 14:45:46 -0500

On Nov 5, 4:35=A0am, "Wolfgang Schwanghart"
<schwanghartremove.t...@googlemail.com> wrote:
> This might be what you are searching for:http://www.mathworks.com/matlabc=
entral/fileexchange/14677
>
> Best regards,
> Wolfgang
>
> jdella...@web.de wrote in message <db855997-a73b-4230-83a8-e6a152e8d...@q=
30g2000prq.googlegroups.com>...
> > Hi there!
> > I want to plot a pack of data with structure [x(i) y(i) z(i)] in a way
> > that the color changes specified by the z-values. I tried already
> > plot3, surf, surface, mesh and scatter3. With plot3 the data are
> > displayed in the way I want, but not with changing color. And with
> > surf, surface, mesh and scatter3 I get changing color, but the x- and
> > y- axis values are no more according to the x(i) and y(i) coordinate
> > values but seem to be the index i, so that the projection of the
> > surface I define with all those xyz-pairs to the x-y-plane is no more
> > shaped like a rhomb with the correct x,y-values, but a full square
> > with the number of data pairs as x- and y-values. The optimum for me
> > would be if I could just change the color in plot3 from single-color
> > to z-value-dependent. Is that possible? What can I do?
> > Thanx for your support :-)
> > Jazz

You can use the mesh command with three inputs X, Y, Z.

X and Y here can be generated from your x(i), y(i) values using
meshgrid.

Re: plot3 with color according to z-value?

Ken Garrard — Thu, 06 Nov 2008 20:03:03 -0500

Try plot3k from the FEX,
http://www.mathworks.com/matlabcentral/fileexchange/9519
Ken

jdellanna@web.de wrote in message <db855997-a73b-4230-83a8-e6a152e8d56e@q30g2000prq.googlegroups.com>...
> Hi there!
> I want to plot a pack of data with structure [x(i) y(i) z(i)] in a way
> that the color changes specified by the z-values. I tried already
> plot3, surf, surface, mesh and scatter3. With plot3 the data are
> displayed in the way I want, but not with changing color. And with
> surf, surface, mesh and scatter3 I get changing color, but the x- and
> y- axis values are no more according to the x(i) and y(i) coordinate
> values but seem to be the index i, so that the projection of the
> surface I define with all those xyz-pairs to the x-y-plane is no more
> shaped like a rhomb with the correct x,y-values, but a full square
> with the number of data pairs as x- and y-values. The optimum for me
> would be if I could just change the color in plot3 from single-color
> to z-value-dependent. Is that possible? What can I do?
> Thanx for your support :-)
> Jazz