3d plot from xyz data in file

Question

Can someone tell me how can I plot a 3d graph in matlab if I have the data in a single file in three column format like this:

48.000000     0.017723     0.400000
48.500000     0.017467     0.400000
49.000000     0.017209     0.400000
49.500000     0.016943     0.400000
50.000000     0.016664     0.400000
50.500000     0.016361     0.400000
51.000000     0.016022     0.400000
51.500000     0.015628     0.400000
52.000000     0.015151     0.400000
52.500000     0.014539     0.400000
53.000000     0.013709     0.400000

Each column represents a variable (3 axis) and all 3 vary.

Gunther Struyf · Accepted Answer · 2012-08-09 08:34:54Z

3

Use fscanf and plot3:

fid=fopen('data.txt');
XYZ=fscanf(fid,'%f %f %f',[3 Inf]);
fclose(fid);

plot3(XYZ(1,:), XYZ(2,:), XYZ(3,:));

answered Aug 9, 2012 at 8:34

Gunther Struyf

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6 Comments

user1585645 Over a year ago

Error using ==> fscanf Invalid file identifier. Use fopen to generate a valid file identifier. it is showing this error.

Gunther Struyf Over a year ago

the error says it all by itself: have you opened your file first using fid=fopen('name_of_your_file') ?

user1585645 Over a year ago

it's a .dat file so do i need to write something else?

Gunther Struyf Over a year ago

you said you had your data in three columns as showed in your question^^ so that looks like plain text to me. If that's the case, just put the name of your file there: fid=fopen('name_of_your_file.dat_or_whatever') And btw: it doesn't hurt to try things out yourself...

user1585645 Over a year ago

thanks !!! can u please tell me how can i add extra features to my plot{ex. color,surface} ?

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Kishan_KP · Accepted Answer · 2013-08-06 05:54:12Z

1

just try this code,

a=importdata('file.txt');%file_name.extension
plot3(a(:,1),a(:,2),a(:,3));

it's very easy and works fine too.

edited Aug 6, 2013 at 5:54

Kishan_KP

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answered Aug 6, 2013 at 5:32

padmarao

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