how i can export the curve fitting to my actual curve?

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Ana Soph 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575821-how-i-can-export-the-curve-fitting-to-my-actual-curve

评论： Ana Soph 2020-8-6

SOLAR.m

Hi guys, thank you so much for reading me, i am using matlab 2019a, the problem that i have, is i want to graph the curve that is provided for the curve fitting tool to my current curve. So.. what can i do? i was trying to plot the function that is given for the curve fitting tool but it doesn't work.

this is my code right now, ,and also i show you the curve fitting that i want, again thank you so much

pd: the data that i have is in datetime...

tEnersol=readtable('solar.xlsx','sheet','EneDics');    % read into a table object
tEnersol.Properties.VariableNames={'Rad','Dia'};       % assign variable names
yr=2014;                                               % need the proper year 
tEnersol.Date=datetime(yr,1,tEnersol.Dia);             % and create a date column
hB=plot(tEnersol.Date,tEnersol.Rad, '.r'); hold on     % plot against actual date
xtick(0:50:350);
hAx=gca;                                               % get axes handle...
xlim([datetime(2014,1,1) datetime(2014,12,12)])        % set limit to cover the full year
hAx.XAxis.TickLabelFormat='MM';                        % show day of MONTH
% xticklabels(cellstr(tEnersol.Date(xticks)))          % use the date string as tick labels
hAx.XTickLabelRotation=45;                             % rotate so can have chance to read...
xlabel('Mes del año, TMYE'), ylabel('Irradiancia solar máxima [KWh/m^2]');
% a1= 2329 
% b1= 0.6522  
% c1= 0.95
% a2= 1519  
% b2= 0.7781 
% c2= -2.545  
% d =(1:50:365); 
% w = a1.*sin(b1.*d+c1) + a2.*sin(b2.*d+c2)
% D = datetime(yr, 1, d);
% plot(D, w, '.-b')

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Sam Chak 2020-8-6

编辑：Sam Chak 2020-8-6

I think the issue has something to do with the checked 'Center and scale' option. The coefficients for the normalized x. Try unchecking it. I don't know why the Sum of Sine is selected. isn't the skew gaussian distribution a better fit?

Ana Soph 2020-8-6