Thread Subject: noob: 3D plot with colour as 4th dimension?

I have recently stated using MatLab and have come across a problem with
plotting:

I have data [x,y,z,gain] and would like to represent this on a plot of
some sort. What I am thinking is a 3D plot of (x,y,z) where the colour
of that point is defined using a colormap (hot) for the value at that point.

Is this possible? If so, how? An example would be appreciated. Or is
there another way?



Thanks in advance.

"noemailplease" <noemailplease@nno.email.please> wrote in message
news:5-udnWFvuIsGSgXWnZ2dnUVZ_s-dnZ2d@westnet.com.au...
>I have recently stated using MatLab and have come across a problem with
>plotting:
>
> I have data [x,y,z,gain] and would like to represent this on a plot of
> some sort. What I am thinking is a 3D plot of (x,y,z) where the colour of
> that point is defined using a colormap (hot) for the value at that point.
>
> Is this possible? If so, how? An example would be appreciated. Or is
> there another way?

Take a look at the SURF or SCATTER3 functions.

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ

On Mar 12, 3:12 am, "Steven Lord" <sl...@mathworks.com> wrote:
> "noemailplease" <noemailple...@nno.email.please> wrote in message
>
> news:5-udnWFvuIsGSgXWnZ2dnUVZ_s-dnZ2d@westnet.com.au...
>
> >I have recently stated using MatLab and have come across a problem with
> >plotting:
>
> > I have data [x,y,z,gain] and would like to represent this on a plot of
> > some sort.  What I am thinking is a 3D plot of (x,y,z) where the colour of
> > that point is defined using a colormap (hot) for the value at that point.
>
> > Is this possible?  If so, how?  An example would be appreciated.  Or is
> > there another way?
>
> Take a look at the SURF or SCATTER3 functions.
>
> --
> Steve Lord
> sl...@mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ

Also contourf

TideMan wrote:
> On Mar 12, 3:12 am, "Steven Lord" <sl...@mathworks.com> wrote:
>> "noemailplease" <noemailple...@nno.email.please> wrote in message
>>
>> news:5-udnWFvuIsGSgXWnZ2dnUVZ_s-dnZ2d@westnet.com.au...
>>
>>> I have recently stated using MatLab and have come across a problem with
>>> plotting:
>>> I have data [x,y,z,gain] and would like to represent this on a plot of
>>> some sort. What I am thinking is a 3D plot of (x,y,z) where the colour of
>>> that point is defined using a colormap (hot) for the value at that point.
>>> Is this possible? If so, how? An example would be appreciated. Or is
>>> there another way?
>> Take a look at the SURF or SCATTER3 functions.
>>
>> --
>> Steve Lord
>> sl...@mathworks.com
>> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ
>
> Also contourf


Thanks for the feedback so far, but this hasn't helped me.

I think the first part of the problem (other that I am new to this!) is
the data is not in the right "format" for the plotting functions.

I have a list of values collected through experimentation:
input1, input2, input3, gain
1 1 1 -1.0342
1 1 2 -1.0311
1 1 3 -1.3286
...
...
256 256 256 10.8734

I guess I must first do something to this data to get it "ready" for
plotting? If so, what?

Then, how do I get MatLab to colour the point at (x,y,z) in accordance
with the value of the gain for that point? (I am also guessing the gain
value might have to be normalized [0,1] to be best interpreted by the
colormap??)


Any more help is appreciated.

noemailplease <noemailplease@nno.email.please> wrote in message <TP-dnUrMr8kTUgTWnZ2dnUVZ_qWdnZ2d@westnet.com.au>...
> TideMan wrote:
> > On Mar 12, 3:12 am, "Steven Lord" <sl...@mathworks.com> wrote:
> >> "noemailplease" <noemailple...@nno.email.please> wrote in message
> >>
> >> news:5-udnWFvuIsGSgXWnZ2dnUVZ_s-dnZ2d@westnet.com.au...
> >>
> >>> I have recently stated using MatLab and have come across a problem with
> >>> plotting:
> >>> I have data [x,y,z,gain] and would like to represent this on a plot of
> >>> some sort. What I am thinking is a 3D plot of (x,y,z) where the colour of
> >>> that point is defined using a colormap (hot) for the value at that point.
> >>> Is this possible? If so, how? An example would be appreciated. Or is
> >>> there another way?
> >> Take a look at the SURF or SCATTER3 functions.
> >>
> >> --
> >> Steve Lord
> >> sl...@mathworks.com
> >> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ
> >
> > Also contourf
>
>
> Thanks for the feedback so far, but this hasn't helped me.
>
> I think the first part of the problem (other that I am new to this!) is
> the data is not in the right "format" for the plotting functions.
>
> I have a list of values collected through experimentation:
> input1, input2, input3, gain
> 1 1 1 -1.0342
> 1 1 2 -1.0311
> 1 1 3 -1.3286
> ...
> ...
> 256 256 256 10.8734
>
> I guess I must first do something to this data to get it "ready" for
> plotting? If so, what?
>
> Then, how do I get MatLab to colour the point at (x,y,z) in accordance
> with the value of the gain for that point? (I am also guessing the gain
> value might have to be normalized [0,1] to be best interpreted by the
> colormap??)
>
>
> Any more help is appreciated.

Try the FEX function plot3k. Id# is 9519.

Ken Garrard wrote:
> noemailplease <noemailplease@nno.email.please> wrote in message
> <TP-dnUrMr8kTUgTWnZ2dnUVZ_qWdnZ2d@westnet.com.au>...
>> TideMan wrote:
>> > On Mar 12, 3:12 am, "Steven Lord" <sl...@mathworks.com> wrote:
>> >> "noemailplease" <noemailple...@nno.email.please> wrote in message
>> >>
>> >> news:5-udnWFvuIsGSgXWnZ2dnUVZ_s-dnZ2d@westnet.com.au...
>> >>
>> >>> I have recently stated using MatLab and have come across a problem
>> with
>> >>> plotting:
>> >>> I have data [x,y,z,gain] and would like to represent this on a
>> plot of
>> >>> some sort. What I am thinking is a 3D plot of (x,y,z) where the
>> colour of
>> >>> that point is defined using a colormap (hot) for the value at that
>> point.
>> >>> Is this possible? If so, how? An example would be appreciated.
>> Or is
>> >>> there another way?
>> >> Take a look at the SURF or SCATTER3 functions.
>> >>
>> >> --
>> >> Steve Lord
>> >> sl...@mathworks.com
>> >> comp.soft-sys.matlab (CSSM)
>> FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ
>> > > Also contourf
>>
>>
>> Thanks for the feedback so far, but this hasn't helped me.
>>
>> I think the first part of the problem (other that I am new to this!)
>> is the data is not in the right "format" for the plotting functions.
>>
>> I have a list of values collected through experimentation:
>> input1, input2, input3, gain
>> 1 1 1 -1.0342
>> 1 1 2 -1.0311
>> 1 1 3 -1.3286
>> ...
>> ...
>> 256 256 256 10.8734
>>
>> I guess I must first do something to this data to get it "ready" for
>> plotting? If so, what?
>>
>> Then, how do I get MatLab to colour the point at (x,y,z) in accordance
>> with the value of the gain for that point? (I am also guessing the
>> gain value might have to be normalized [0,1] to be best interpreted by
>> the colormap??)
>>
>>
>> Any more help is appreciated.
>
> Try the FEX function plot3k. Id# is 9519.

Thanks Ken, that is the exact function I need. Great work too!