How to find a corresponds value?

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Wiktoria Schabek
Wiktoria Schabek 2021-11-18
回答： dpb 2021-11-18
I have a big .csv file (like 30 000 data) which one I import to matlab (to import i used "readtable"). In one colum are current, in second voltage and in third radiation value. In matlab script im making a power value, then im looking for the max Power value, after that i need to find a radiation value which corresponds in the file to the value of the maximum power and thats where the problem begin. I am making m= max(power_value) and i dont know how to find value of radiation which corresponds to that m. How can i find it?

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采纳的回答

David Hill
David Hill 2021-11-18
[maxPower,idx]=max(yourMatrix(:,1).*yourMatrix(:,2));
radAtMaxPower=yourMatrix(idx,3);

更多回答（1 个）

dpb
dpb 2021-11-18
Use the optional second return value of max
[mx,imx]=max(t.Power);
rmx=t.Radiation(imx);
NB: the use of the table, t variable and dot reference directly instead of making duplicate copies of the data in the table as standalone arrays.
See the doc for max for all the details.
MORAL: Always read the documentation FIRST!; MATLAB may already have the solution at hand.

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