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interp2 error non monotonus

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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
  4 Comments
Harish Vernekar
Harish Vernekar on 22 Feb 2021
here is the data we have rpm on x axis and torque on y axis i have to interpolate a look up table to get the values for the calculated torque and RPM values

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Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 22 Feb 2021
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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