Create Lookup Table in Matlab

Hi, I want to create lookup table in Matlab that contains angle in radians and power value corresponding to it. The main code will have an angle which will be looked for in the lookup table and return the corresponding power value. I want to use linear interpretation to calculate the angles values that are not present in the table. Can you please help? Thanks

Answer 1

[Image Analyst]

Try interp1:

allAngles = linspace(0, 2*pi, 10000); % 10 thousand elements in the look up table.
powerLut = interp1(angles, powers, allAngles);

anglesis the array that has however many angle values that you have to begin with. Same for powers - it's the corresponding power for each of those angles. Be aware that you have to determine the index and not just put in some floating point angle into the look up table, so it needs to be an integer between 1 and 10 thousand.

[Sherif Elkholy]

Thanks. I will try it this afternoon.

Answer 2

[Les Beckham]

As Image Analyst said, I think interp1 is the way to go. However, I would just call it with the specific angle for which you want the power value:

currentAngle = pi/4; % for example
currentPower = interp1(angles, powers, currentAngle); % returns the power value corresponding to currentAngle

This, of course, assumes that you know the power values (powers) for some specific set of angle values (angles). These two known vectors constitute your lookup table. Check the doc for interp1 for more info.

[Sherif Elkholy]

Thanks.