interp2 -strictly monotomus increasing

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Harish Vernekar
Harish Vernekar 2021-3-15
编辑： Asvin Kumar 2021-3-17
Nm=[0.0366242038216561 0.256369426751592 0.671443736730361 1.03768577494692 1.58704883227176 2.00212314225053 2.53927813163482 2.91772823779193 3.40605095541401 3.84554140127389 4.37048832271762 4.84660297239915 5.31050955414013 5.70116772823779 6.07961783439491 6.32377919320595 6.45806794055202 6.51910828025478 6.55573248407643 6.48248407643312 6.40923566878981 6.33598726114650 6.26273885350318 6.21390658174098 6.14065817409767]
tm=[0.485833678632479 2.97491876894587 5.92553696834441 5.95681051392846 8.98528217489712 8.10274242779360 10.4015267390947 9.17522019607471 11.2522554584995 11.4037507008547 13.2569373682494 13.4685308941754 14.0861325375119 13.8739774388098 14.3517545727446 13.1898905990187 12.1320463219057 11.3801661360874 11.1561990863248 9.75845459943019 9.63848959401710 9.51852629230771 9.39856469430197 9.60254185941754 9.19863248363408]
data=xlsread("ss.xlsm");
rrpm=data(2:end,1);
ttorque=data(1,2:end);
epk_eff=data(2:end,2:end);
[ttorque,rrpm]=meshgrid(ttorque,rrpm)
eff_epk=interp2(ttorque,rrpm,epk_eff,tm,Nm);
%%excel sheet attached for eff_data
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Harish Vernekar
Harish Vernekar 2021-3-15
this is previous one
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);
Asvin Kumar
Asvin Kumar 2021-3-17
编辑：Asvin Kumar 2021-3-17
It's unclear what you're trying to achieve or what problem you're facing.
Are you seeing any errors? Are you stuck somewhere? What's your question? For the community to help you better, please add descriptions of what you are trying to do.
Have a look at the doc page for interp2 on the 4th and 5th input arguments. You should either change the orientation of Nm or tm. Or you should create a meshgrid out of Nm and tm like you do for ttorque, rrpm.

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