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From: Rachit on 23 Jun 2010 02:27
Hello All,

I have a problem generating surfaces from 2 data files that I am importing.My data varies along the Z-co-ordinate and X-Y remain the same.

I imported and created the surfaces for the first data file and similarly for the second.I used the mesh , gridata and surf command to generate the data from one data file.

Is it a way that I can combine both of them to show the variation in the Z co0ordinate and show the change in surface.

I will be having 10 files in total which I want to show change in variation of Z co-cordinate

Thanks,

Rac
From: Walter Roberson on 23 Jun 2010 09:24
Rachit wrote:

> I imported and created the surfaces for the first data file and
> similarly for the second.I used the mesh , gridata and surf command to
> generate the data from one data file.
>
> Is it a way that I can combine both of them to show the variation in the
> Z co0ordinate and show the change in surface.

What are you anticipating that the combined plot would look like? You
could plot both surfaces at a common origin and scale, but then the Z
values for one would obscure the Z values for the other. You could make
the surfaces transparent so that you could see "into" the hidden parts,
but by the time you get to 4 surfaces that transparency is going to
pretty much useless.
From: Rachit on 23 Jun 2010 09:50
Walter Roberson <roberson(a)hushmail.com> wrote in message <YVnUn.65002$h57.27247(a)newsfe22.iad>...
> Rachit wrote:
>
> > I imported and created the surfaces for the first data file and
> > similarly for the second.I used the mesh , gridata and surf command to
> > generate the data from one data file.
> >
> > Is it a way that I can combine both of them to show the variation in the
> > Z co0ordinate and show the change in surface.
>
> What are you anticipating that the combined plot would look like? You
> could plot both surfaces at a common origin and scale, but then the Z
> values for one would obscure the Z values for the other. You could make
> the surfaces transparent so that you could see "into" the hidden parts,
> but by the time you get to 4 surfaces that transparency is going to
> pretty much useless.

I am anticipating that Z would decrease with time and hence want to show a color map of the height variation.Is it possible to generate a surface as a function of Z since it is going to change with time.
From: Walter Roberson on 23 Jun 2010 10:56
Rachit wrote:

> I am anticipating that Z would decrease with time and hence want to show
> a color map of the height variation.Is it possible to generate a surface
> as a function of Z since it is going to change with time.

You are asking for a 4D graph -- for each X and Y pair, you have one Z
per time instance. You could assign a distinct colour to each time
instance, but if your Z's are decreasing over time then the first Z
would hide the rest unless you use transparency, and if you use
transparency then you need to be careful to ensure that the bottom-most
color is still distinctive after passing through 9 layers -- which
requires each layer to be something more than 50% transparent if the
bottom layer is full brightness.
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