How to interpolate values

2013 3 7
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Hello. I have the question about how would you interpolate some values. For example, I have:
x y z
1 4 7
3 6 9
I want a point between (1,4) and (3,6) with the mean value of z.
Thank you in advanced!!

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Jan
Jan 2013-3-7
This is not clear. What is "a point between (1,4) and (3,6)"?
chaos4u2
chaos4u2 2013-3-7
I mean for example a middle point between (1,4) and (3,6), that would be (2,5). How can I do the interpolation?
Matt Kindig
Matt Kindig 2013-3-7
Do you just mean that you want the mean of the x, y, and z coordinates? If so, your middle point would simply be
mid = mean([x, y, z], 1);
Or are you asking something else?
chaos4u2
chaos4u2 2013-3-7
Thank your for answering.
Not exactly. I have a file .dat of coordinates x,y,z. About 2 million data or even more.
What I want is to reduce all, for example at 10.000. But I don't know how to do it. I thought to do an interpolation, but I'm realising that's not a good idea.

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Sean de Wolski
Sean de Wolski 2013-3-7

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There aren't enough points to perform a 2d scattered interpolation which requires a Delaunay Triangulation under the hood. Instead, just use interp1 twice:
interp1([1 4],[7 9],2.5)
or acquire more data (recommended).

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