Pre-computed triangulation for scatteredInterpolant

• I have a data file that contains >400 time steps of velocity data at spatial locations scattered in 3D space. I use the data in this file in a lot of MATLAB scripts. Using the scatteredInterpolant class I was able to get velocity at any location I want.
• However, it is rather time consuming to perform the triangulation every time I use the file.
• I tried to store the computed scatteredInterpolant objects for each time step in a cell array,. and save to a mat file on disk. The intention was to load up this new mat-file instead if I want to access the data.
• But it takes ages to load - as if MATLAB recomputes the functions every time the file loads.

Any solution to this? i.e. Is there a way to use scatteredInterpolant with pre-computed triangulation that I can just load up from a file?

[Matt J]

I tried to store the computed scatteredInterpolant function handles for each time step in a cell array,. and save to a mat file on disk.

What exactly do you mean by a "scatteredInterpolant function handle"? scatteredInterpolant() is a class constructor. It generates objects of its own class, not ones of type function_handle.

Also, how big are the .mat files that this process generates? Maybe it takes ages to load because you just have a lot of data.

[lm808]

Hi Mat,

Thank you. What I meant was saving the constructed scatteredInterpolant objects in a MAT file. Each object has associated triangulation, coordinates and values stored within its properties. Basically the result (F) of the code "F = scatteredInterpolant(x,y,z,v)".

The .mat file is of similar size to the original data file.

[KSSV]

How big is your scattered data? Hope you are not doing triangulation for every time step. I have accessed a scattered data of size greater then 472193 with ease saving into a mat file. Interpolation was also quite fast enough.

[lm808]

I am doing triangulation for every time step - I have to because the spatial coordinates x,y,z changes at every time step.

About 2000 data points per time step, 500 time steps or so.

[KSSV]

2000 data points code should be fast enough. How much time it takes for one step calculation? Attach one step data here. Let me a give a try.