How can I add a a best fit line, a scatter plot data? having trouble
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% using the excel data
[FileName, PathName] = uigetfile('*.xlsx','Select Excel files to analyze:','MultiSelect','off');
[status, sheets] = xlsfinfo([PathName, FileName]);
data_summary = xlsread([PathName, FileName],sheets{1});
% using struct to structure the data
data = struct('Heights',[],'Qs',[]);
data.heights=(data_summary(1:5,1));
data.flowrates=(data_summary(1:5,2:11));
figure (1)
for i=1:5
subplot(2,3,i)
histogram(data.flowrates(i,1:10),10)
xlabel('Volumetric flow rates [mL/s]','FontSize',10,'FontWeight','bold');
ylabel('Number of occurances','FontSize',10,'FontWeight','bold');
legend(['water exit height=' num2str(data.heights(i))]);
end
% Adding the average flow rate histogram
Qavg=mean(data.flowrates,2);
Qstd=std(data.flowrates,0,2);
errQ=Qstd./2;
subplot(2,3,6)
% fit=polyfit(data.flowrates,1);
% plot(polyval(fit,data.heights))
errorbar(data.heights,Qavg,errQ,'ro')
xlabel('Water exit height [cm]','FontSize',10,'FontWeight','bold');
ylabel('Flow rate [ml/s]','FontSize',10,'FontWeight','bold');
**
% I keep getting an error with what I have so far
1 comentario
Rik
el 6 de Abr. de 2019
You did not attach the excel file, nor did you post the complete error message.
Respuestas (2)
Saeed Bello
el 29 de Ag. de 2021
Just add lsline after your scatter plot expression. For example
scatter(x,y) lsline
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