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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.,
Lamda e 0.25 0.545 0.26 0.556 0.27 0.654
…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.
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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. >> plot(x,y,'sb',x2,f(x2),'*r')
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.