Creating seperate lines using plot3()

Luca Koldeweyh

2021 5 10

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Hi, the issue might be simple but I'm still stuck with it. The goal is to create a 3D plot with separate lines using plot3(). A new line is supposed to start each time the whole row is NaN.

I created a normal array 'coast3'. lat and long are column arrays:

r = 6371;
x = r.*cos(lat).*cos(long);
y = r.*cos(lat).*sin(long);
z = r.*sin(lat);
coast3 = [x,y,z]

The command plot3(x,y,z) produces just one single line. There's 240 rows that are NaN. So I produced a cell array 'D':

idx = all(isnan(coast3),2);
idr = diff(find([1;diff(idx);1]));
D = mat2cell(coast3,idr(:),size(coast3,2))

It seems like the cell array can't be plotted with plot3. At least I don't see a way.

Would be so great if anyone knows a way to plot that.

Cheers and thanks!

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Adam Danz 2021-5-10

Hello @Luca Koldeweyh welcome to the forum. I formatted your code so it's easier to read and more enticing to answer. In the future you can format code in the forum using the Text/Code toggle button in the rich text editor (instructions).

Adam Danz 2021-5-10

From the plot3 documentation,

"To plot multiple sets of coordinates on the same set of axes, specify at least one of X, Y, or Z as a matrix and the others as vectors." ... "Each of X, Y, and Z must have at least one dimension that is same size". (Examples provided in the link).

If you provide more info about where the NaNs come come or, better yet, attach a mat file containing the lat and long variables, perhaps I could give more specific guidance.

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