Plotting 4 column of data

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reza 2013-3-25

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Hi everybody

I have obtained 4 column of data from an experiment. They are X, Y, Z as positions and d as density.

This density is the electron density around an atom.

I want to plot this data in such a way that d represents the color and wherever d is low, there is light color and wherever d is high, there is a dark color.

I imported the data to matlab and selected surf function but the 3d curve is very inaccurate and ugly :D

How can I plot such a curve? I am a beginner in matlab by the way.

Thanks :)

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Walter Roberson 2013-3-25

Are the X, Y, Z regularly spaced, or are they irregular? Is there only one Z per (X,Y) combination ?

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回答（3 个）

Ilham Hardy 2013-3-25

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Hi reza,

How do you define the very inaccurate and ugly graph? can you post the resulted graph? By the way dou you need curve or 3d-shaded surface? If you need the latter, surf is the correct choice.

See more documentation of the surf, by typing doc surf in you rcommand window..

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reza 2013-3-25

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I need clouds. The density of electrons are like clouds around atoms. My data should result in several clouds in the XYZ cordination. d is in fact the color of these clouds.

This is what I got and is not what I want.

X, Y and Z are irregularly spaced.

Thanks

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Kelly Kearney 2013-3-25

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在 MATLAB Online 中打开

Try scatter3. Assuming data is your n x 4 matrix:

scatter3(data(:,1), data(:,2), data(:,3), [], data(:,4), 'filled');

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reza 2013-3-25

I reversed the colormap and it turns to orange instead of blue. That's it. Nothing more happened.

Right now the min and max of the axes are 0-20 0-40 and 0-60.

I have 268000 points with (XYZd)

When I zoom in, it is not solid line but it consists of very small dots which are very close to each other.

Walter Roberson 2013-3-26

What is min() and max() of the d data?

Try using the rotate to move the image around. The solid-looking background: does it turn out to be organized into planes, more or less? If you pan to move the edges into or out of view, does a "wall" disappear?

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