How can I make this line start from a specific date?

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Pul 2021-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/1446814-how-can-i-make-this-line-start-from-a-specific-date

编辑： Pul 2021-9-5

采纳的回答： Star Strider

Hello everyone,

How can I make the magenta line start from a specific date (14 Jan 2015) in the graph, instead of 1 Jan 1998?

% Lv = DTv <= datetime('7-Jan-2020');

Thank you!

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Answer 1

Star Strider 2021-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/1446814-how-can-i-make-this-line-start-from-a-specific-date#answer_780934

在 MATLAB Online 中打开

Change ‘Lv’ to:

Lv = (DTv <= datetime('7-Jan-2020')) & (DTv >= datetime('14-Jan-2015'));

and it should do what you want.

Consider adding:

xlim([min(DTv(Lv)) max(DTv(Lv))])

after the plot calls that use ‘DTv’ to restrict the x-axis limits. This is not required, however it would avoid whitespace at the ends of the plots.

.

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Star Strider 2021-9-4

在 MATLAB Online 中打开

As always, my pleasure!

The code I posted ran without error on my computer offline (R2021a Update 5).

Specifically, extracting that vector:

xlim_vector = [min(DTv(Lv)) max(DTv(Lv))]

produced:

xlim_vector = 
  1×2 datetime array
   14-Jan-2015   07-Jan-2020

I inserted that xlim call only after the second figure, so that may be the issue, although I deifined ‘Lv’ just after defining ‘DTv’ so that part of the code is now:

DTv = datetime(DATIECMWFgiornalieri{:,1:3});
Lv = (DTv <= datetime('7-Jan-2020')) & (DTv >= datetime('14-Jan-2015'));                    
smb=table2array(DATIECMWFgiornalieri(:,4));
smb = fillmissing(smb, 'constant',0);
Cum=cumsum(smb);
Cum_smbp=DATIECMWFgiornalieri;
Cum_smbp(:,4)=array2table(Cum);
figure
% plot(x,y,'g', 'DisplayName') 
hold on
plot(DTv(Lv),table2array(Cum_smbp(Lv,4),Cum_smbp.SMB_larsenmm(1:8042)),'m');
xlim([min(DTv(Lv)) max(DTv(Lv))])

That ran without error.

The

>>

prompt leads me to believe that you are running it from the Command Window instead of a script. That could be the problem, although I have no way of determining that exactly, or the reason that would have failed.

.