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How do I interpolate a value from two sample vectors and two actual vectors?

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Alan Gallagher
Alan Gallagher 2015-3-16
编辑： Alan Gallagher 2015-3-16
I have a torque curve per rpm in two vectors:
rpm: 1250 1500 1750 2000 2500 3000 3500 4000 4500 5000 5500 6000
and torque: 194 259 325 383 420 420 413 410 395 383 343 275
So each vector is length 12. I also have real-time data in the form of two very long vectors giving rpm (rpm) and percent load (pctload).
I need to interpolate the actual, real-time torque value by multiplying the torque at that rpm(in the torque curve) by the percent load.
I have a feeling this can be done with the interp2 function, but am having trouble.
Any suggestions? clarification needed?
Thank you in advance.

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采纳的回答

Alan Gallagher
Alan Gallagher 2015-3-16
编辑：Alan Gallagher 2015-3-16
Figured it out:
tableN= list of rpm's from 1250 to 6000
tabletorque: list of tested torques at the N values
rpm= real-time rpms
pctload= real-time percent load
real_time_torque=interp1(tableN,tabletorque,rpm).*pctload;

更多回答（1 个）

Adam
Adam 2015-3-16
>> g = griddedInterpolant( rpm, torque );
>> g( 1777 )
ans =
331.264
should do the trick. There are numerous interpolation methods that will probably work too - interp1 probably, but your interpolation is 1d not 2d unless I am misunderstanding the problem.
The value coming from the griddedInterpolant function g above is your interpolated RPM which you can then match to your pctload.

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