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

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.

Answer 1

[Alan Gallagher]

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;

Answer 2

[Adam]

>> 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.

[Alan Gallagher]

Thanks Adam,

This was correct too, however, interp1 allowed me to create a vector of these values.