MATLAB: Interp2 error non monotonus

gear ratiointerpolationMATLAB

Hello i am facing problem with interp2
i have rpm , torque , efficiency values of motor i need to get eff using interp2
 for i=1
    torque_motor=data(:,1);
    rpm_motor=rpm;
    eff_motor=data;
    end
    for i=1:1:length(torque_motor)
        for j=1:1:length(rpm_motor)
            for k=1:1:length(data)
            temp1=find(torque_motor(:,k)==torque_array(i));
            temp2=find(rpm_motor(:,k)==rpm_array(j));
            [val,pos]=intersect(temp1,temp2);
            
             eff_epk=column_eff(val)
             i=i+1
             j=j+1
             k=k+1
            end
            end
        end
    end
eff_epk
[ttorque,rrpm]=meshgrid(torque_array,rpm_array)
ttorque=ttorque';
rrpm=rrpm';
for i=1:length(t)
EPK_operating=interp2(rrpm,ttorque,eff_epk,Nm,tm)
end

Best Answer

It should (big claim, I know) be as simple as:
torque = data(2:end,1);
rpm = data(1,2:end);
eff_epk = data(2:end,2:end);
Nm = [2^.5 exp(-1), pi, exp(2)]; % You'll have more sensible parameters here...
tm = [3 30 300 3000]; 
EPK_operating=interp2(rrpm,ttorque,eff_epk,Nm,tm);
HTH
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