Graph two curves together (datetime format and double format)

Question

Ana Soph 2020-8-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/575800-graph-two-curves-together-datetime-format-and-double-format

评论： Ana Soph 2020-8-6

solar.xlsx

Hi, thank you so much for reading me, i am using matlab 2019a, and i have this problem, i want to graph a function of curvefitting with my original curve, but i can't for this error that appears (attach photo) , i want the two graphs together .......

thank you so much for your valious time

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     % bar plot against actual date
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 = (1:1:365); 
w = a1.*sin(b1.*d+c1) + a2.*sin(b2.*d+c2)
plot(d,w,'.-b'); hold off 

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Answer 1

Walter Roberson 2020-8-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/575800-graph-two-curves-together-datetime-format-and-double-format#answer_475729

在 MATLAB Online 中打开

hB=plot(tEnersol.Date,tEnersol.Rad, '.r'); hold on     % bar plot against actual date

That is the first plot in the axes, and it establishes that the x axes is to be based upon datetime values.

plot(d,w,'.-b'); hold off

Your d is not datetime values, just pure numbers. You cannot plot a pure number variable in an axes that is already a datetime axes. So...

D = datetime(yr, 1, d);
plot(D, w, '.-b')

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Ana Soph 2020-8-6

在 MATLAB Online 中打开

thank you , i finally use this code:

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
% xticks(0:50:365);
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]');
% z = fminsearch(@ds,[1339 .05 .12 492.1 .01 1.96])
% fplot(a1.*sin(b1.*d+c1) + a2.*sin(b2.*d+c2), [0,365]) hold off
a1= 1339
b1= 0.00571  
c1= 0.1232
a2= 492.1  
b2= 0.0086
c2= 1.966  
d =(1:365); 
w = a1.*sin(b1.*d+c1) + a2.*sin(b2.*d+c2)
D = datetime(yr, 1, d);
plot(D, w, '.-b')