Convert (x,y) data into a function y => f(x)
조회 수: 110(최근 30일)
To whom it may concern:
It is one of those days when apparent simple tasks seem hard for some reason.
I have a continues but highly non smooth dataset of emissivity versus wavelength. I would really like to put this into a (lookup) function so the my dataset (lamda, e), i.e.,
…etc will turn into a function e = f(lamda). This would be very helpful since I can then create a function handle and integrate over certain wavelength regions and perform other operations.
Matt Fig 2012년 12월 14일
You could use POLYFIT, or the curve fitting toolbox or a simple interpolation.
>> x = 0:.25:5;
>> y = x.^2;
>> f = @(z) interp1(x,y,z); % Lookup table function
>> x2 = 1/8:1/8:5; % Just to compare func to data.
Jing 2012년 12월 13일
Hi Jaap, I can't fully understand your question. Do you mean you want a lookup table in function form? If so, you can use fitting process(The fitting highly depends on the fit type your use) to build a function, but the function may not be very accurate at each data point.