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

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!

Answer 1

[Star Strider]

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.

.

[Pul]

Thank you!

It gives me error when I add " xlim([min(DTv(Lv)) max(DTv(Lv))])"

">> xlim([min(DTv(Lv)) max(DTv(Lv))])
Error using xlim (line 31)
Limits must be a 2-element vector of increasing numeric values."

[Star Strider]

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.

.

[Pul]

No, I just copied the error I got from the Command Window, but I runned the code in a proper way!

Now I got this. The first plot is right but on the x-axis "Jan" appears instead of just years while the second plot is just the repetition of the first one, but with a white space at the end of the graph.

[Star Strider]

Replace:

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

with:

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

For the third plot, see if:

xtickformat('yyyy')

does what you want.

.

[Pul]

Yes, perfect.

Thank you!

[Star Strider]

As always, my pleasure!

.