Plotting a giant surface exceeding array limitations

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Robert Scott 2023-12-3

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评论： Robert Scott 2023-12-4

采纳的回答： Matt J

Hi all

I have a need to plot a large surface.

Im trying to create a multi dimensional array.

Picture the following.

A typical X and Y plot that is a vector that has 40,000 data points. If you plot that you get a simple traditional XY graph.

Now, i have say 100 of the X and Y vectors and want to plot them all as a surface.

I tried something like this to build the array first. According to the matlab documentation the 3rd variable is like a page variable. Which is exactly what i need.

So to start i just tried

test = zeros(40,000,40,000,100)

And i got an error saying that my array will take 775 gig of space lol

So how does one go about doing this?

Thanks

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Robert Scott 2023-12-3

I looked into that but there are very poor examples for tall arrays mostly using data that already exists in some file.

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采纳的回答

Matt J 2023-12-3

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编辑：Matt J 2023-12-3

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First of all, you should consider downsampling from 40000 points to perhaps 400. Having very dense data beyond a certain point will not help you better visualize the surface.

Aside from that, though, your surface will have 40000*100 points, so a trisurf plot would only require you to form 40000x100 arrays.

[Xsurf,Ysurf,Zsurf]=deal(zeros(4e4,100)); %pre-allocate

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Matt J 2023-12-4

编辑：Matt J 2023-12-4

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any chance you can offer some explination or code commenting?

Well, most of the lines of code in my last comment was just generating hypothetical X,Y,T data, which I did note in a comment. The only real work once the data is given was these 2 lines, which is really just calling trisurf:

dt=delaunay(X,Y);
trisurf(dt,X,Y,T,'EdgeColor','none'); xlabel X; ylabel Y; zlabel T

I don't know what more I can say about that. If you've never used trisurf and are having trouble understanding the documentation for it, then you can say what it is you are stuck on.

Can you do this will a cell array?

Undoubtedly, but you have wasted a lot of time not providing your own example data, and asking me to propose example data instead. Obviously, we cannot be expected to know in advance the data organization you have in mind.

Im trying to do something like this but cant get the plot to work

Is this supposed to be the temperature data?

surface_matrix{k,2} = [k];

Matt J 2023-12-4

How can i get this to work with just a simple meshgrid.

I don't think you can, because in your original problem description, your X,Y data is scattered, not gridded. Ifthat's no longer the case, it would seem that you have a whole new problem and you should accordingly post a whole new question.

Robert Scott 2023-12-4

Thanks, Matt

Well, i have no idea how it works but it works.

I basically just took 3 giant vectors X,Y and T and put them in the surf command and it worked.

This turned out to be a total waste of a day sadly. My misinterprestation of the data set really screwed me up and caused me to write many nonsensical scripts.

In the end, your original solution or my cell array solution would work for something like this.

I thank you for your persistance in helping me esepcailly on a sunday.

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