How to generate?

I'm a beginner of this program. Please help me to do the plot like figure 2 My editor note: scatter(x1,y1,z1,"filled",'*'); hold on

Answer 1

[Star Strider]

Try this —

x1 = randn(10,1);                                       % Column Vectors
y1 = randn(size(x1));
z1 = randn(size(x1));

figure
scatter3(x1, y1, z1, 'filled')
grid on

zv = zeros(size(x1));

figure
scatter3(x1, y1, z1, 'filled')
hold on
plot3([zv x1]', [zv y1]', [zv z1]')
scatter3(0, 0, 0, 150, 'g', 'p', 'filled')
hold off
grid on

.

[Beginner Boy]

Thank you very much!

the results show like this

What did I do wrong?

[Star Strider]

My pleasure!

My guess is that the vectors in the code image began as row vectors, not column vectors, as were the vectors in my code.

Changing my code from column vectors to row vectors provides a solution —

x1 = randn(1,10);                                       % Row Vectors
y1 = randn(size(x1));
z1 = randn(size(x1));

figure
scatter3(x1, y1, z1, 'filled')
grid on

zv = zeros(size(x1));

figure
scatter3(x1, y1, z1, 'filled')
hold on
plot3([zv; x1], [zv; y1], [zv; z1])
scatter3(0, 0, 0, 150, 'g', 'p', 'filled')
hold off
grid on

The main difference is how the vectors are concatenated in the plot3 call that draws the lines, since plot3 has to see them the same way, regardless.

If your vectors are column vectors, use my original code.

If your vectors are row vectors, use the code in this comment.

(In both, plotting the origin as a green pentagram (or anything else) is optional. I did it here simply for clarity.)

.

[Beginner Boy]

It's work!

Thanks again for your help!

[Star Strider]

As always, my pleasure!

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