Upgraded to R2017a from R2016a and now fit function won't work

Question

Thomas Burbey 2018-3-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/390314-upgraded-to-r2017a-from-r2016a-and-now-fit-function-won-t-work

评论： Walter Roberson 2018-3-26

I'm getting the following error (the code worked fine with version R2016a). Can anyone help and explain why??

Error using cfit/plot (line 224)
Values plotted against x-axis must be datetime values. To create datetime values, use the DATETIME function.
Error in Well31 (line 17)
plot(f06,d2006,pf31.piezo_F31(r2006),'.b')
pf31.Date1 = datetime(pf31.date);
% 2006
figure
r2006 = 75:439;
plot(pf31.Date1(r2006),pf31.piezo_F31(r2006),'.b','DateTimeTickFormat','MMM-yy') % 2006 data
hold on
d2006=datenum(pf31.Date1(r2006));
f06 =  fit(d2006,pf31.piezo_F31(r2006),'poly3','Normalize','on','Robust','Bisquare');
coeff06 = coeffvalues(f06)
pvals = probvalues(f06)
disp(f06)
plot(f06,d2006,pf31.piezo_F31(r2006),'.b')  <--This is line 17 d2006 is a datenum value
xlabel('Date');
ylabel('Water Level (m)')
title('P31');
ylim([-10 -2]);