I have 10 data points for 5 different trial, and when I would like to get a best fit line using polyfit and errorbars on data points. However, I get a matrix demenssion error. How can I account for this to execute these commands

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juan Ortiz 2019-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/456112-i-have-10-data-points-for-5-different-trial-and-when-i-would-like-to-get-a-best-fit-line-using-poly

Hwater = 20.574;
IPH = 1./(Hwater + data.heights);
%plot (IPH(1:5),data.flowrates(1:5),'ob')
plot (IPH(1:5), data.flowrates(1:5,2:10),'ro')
hold on 
errorbar(IPH(1:5),data.flowrates(1:5),errQ(1:5),'go')
D1=IPH(1:5);
R1=data.flowrates(1:5,2:10);
H=polyfit(D1,R1,1);
G=polyval(H,D1);
plot(IPH(1:5),G,'-')