# How to speed up a 2D interpolation in MATLAB?

11 vues (au cours des 30 derniers jours)
Jack Smith le 25 Jan 2023
Commenté : Jack Smith le 30 Jan 2023
I am reading a table from excel which I am using as the basis for a 2D interpolation, I've included an image of the table with the x, y and output variables shown with the sensitive data omitted for reference.
I have sensor data for position and velocity, with the variable names Raw_Position and Raw_Velocity respetively, that are used to interpolate the Output0 value at a given positon and velocity. The sensor data is in the format of n rows and m columns.
Currently I am achieving this using two interp1 functions inside nested for loops that repeat the calculation for every row and column of the sensor data but this is very slow and my script is taking several minutes to run for a large data set. Is there a way to speed up this process with the interp2 function or something similar?
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### Réponse acceptée

Paul le 25 Jan 2023
A single call to interp2 should do the trick
Position0 = 1:4;
Velocity0 = 1:5;
Output0 = Position0.' + Velocity0;
RawPosition =[1 2;3 4;1 2]; RawVelocity = [2 3;4 5;1 2];
Output = interp2(Velocity0,Position0,Output0,RawVelocity,RawPosition)
Output = 3×2
3 5 7 9 2 4
% check
RawPosition + RawVelocity
ans = 3×2
3 5 7 9 2 4
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Jack Smith le 30 Jan 2023
Thanks Paul, after swicthing the position and velocity variables this has worked for me now.

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