How can I interpolate for " not strictly monotonic increasing vectors" ?
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Hi All! I have tried to do some interpolation lately but unfortunately I have some issues.
I have a speed array called
Speed = [22 22 22.5 22.5]
and I have a Angle array called
Angle = [130 180 130 180].
So I have run my script for those arrays and I have a output called RPM.
RPM = [91.1490 91.2120 93.2234 93.2860].
The way I have run my script is by "Crossing the inputs(Speed and Angle), so the first RPM (RPM(1)) is simply for Speed = 22 and Angle = 130, RPM(2) = speed = 22 Angle = 180 etc. I want to find the RPM for a given Speed and Angle in the range, lets say Speed = 22.3 and Angle = 150. When I use interp2 the error massage is "The grid vectors are not strictly monotonic increasing". How do I solve this problem? I hope the problem in understandable, otherwise feel free to ask!
Best regards Isa
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Guillaume
il 11 Mar 2016
If your known points are properly gridded, you first need to convert them into a grid:
Speed = [22 22 22.5 22.5];
Angle = [130 180 130 180];
RPM = [91.1490 91.2120 93.2234 93.2860];
Speedgrid = reshape(Speed, [2 2]);
Anglegrid = reshape(Angle, [2 2]);
RPMgrid = reshape(RPM, [2 2]);
g = griddedInterpolant(Anglegrid, Speedgrid, RPMgrid); %Angle and speed need to be in this order, or the whole lot transposed
%query for speed = 25, angle = 150:
rpm25_150 = g([150, 25])
Using scattered interpolant:
s = scatteredInterpolant(Speed', Angle', RPM')
rpm25_150 = s([25, 150])
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