How to find a corresponds value?

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?

Answer 1

[David Hill]

[maxPower,idx]=max(yourMatrix(:,1).*yourMatrix(:,2));
radAtMaxPower=yourMatrix(idx,3);

Answer 2

[dpb]

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.