# Plotting 3D graph using measured points

조회 수: 4 (최근 30일)
Jesper 2011년 7월 18일
댓글: Kai Mun Chan 2020년 8월 31일
Hi, I have a question regarding finding a way to easily display my measured data as a 3D plot. How do I make the plot the easiest way? I have over 7000 data points and each data point contain a x-, y- and z-value.
This is a selection of the data I wish to visually represent in [x, y, z] format:
[250, 24, 30]
[256, 50, 41]
[260, 67, 42]
[268, 65, 46]
[270, 28, 35]
I have a hunch the z-value is some kind of function to the x and y value. Every data point should be considered as a coordinate in the xyz-room and I whish to put all my 7000 points in that image.
So my question is, how can I implement this? I've tried using the surf and mesh functions but haven't made any real progress.

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### 채택된 답변

Arnaud Miege 2011년 7월 18일
Maybe try plot3.
Arnaud

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### 추가 답변 (3개)

Walter Roberson 2011년 7월 18일
scatter3()
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Walter Roberson 2011년 7월 18일
It appears that your data is not regularly spaced in x and y. If it _is_ regularly spaced, then even if the points are out of order, there are relatively simple mechanisms to get them in to a grid format that you could use surf() on. If your data is not regularly spaced but you want it to be, you could use the older griddata() or the newer triscatteredinterp http://www.mathworks.com/help/techdoc/ref/triscatteredinterp.html
But if you are happy to have the data be irregularly spaced then scatter3() should do fine.

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Patrick Kalita 2011년 7월 18일
You could try trisurf.
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Jesper 2011년 7월 19일
Thanks, they were useful.
I also used the sftool and it works well. It even fits data to planes.
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Kai Mun Chan 2020년 8월 31일
Hi,
sftool was not encouraged in R2019b. Matlab recommended cftool.
Cftool was able to plot for my surface.

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