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Set specific date ticks

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EM
EM on 13 Oct 2017
Answered: Med Aymane Ahajjam on 14 May 2019
Hi trying to set specific date ticks. I don't understand why the following code does not work
figure()
hold on
box on
plot(date1,series1,'k')
plot(date1,series2,'r--')
xlabel('Date')
ylabel('Price')
DateString = {'06/30/2010';'11/30/2010'};
datenum(DateString);
set(gca, 'XTick', datenum(DateString))
dateFormat = 1;
datetick('x', dateFormat)

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Accepted Answer

Walter Roberson
Walter Roberson on 13 Oct 2017
datetick('x', dateFormat, 'keepticks')

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Show 2 older comments
EM
EM on 13 Oct 2017
Thank you!
EM
EM on 21 Oct 2017
Hi I'm still receiving an error. Can you help?
Here is the code:
figure()
hold on
box on
plot(date1,series1,'k')
plot(date1,series2,'r--')
xlabel('Date')
ylabel('Price')
DateString = {'06/30/2010';'11/30/2010'};
datenum(DateString);
set(gca, 'XTick', datenum(DateString))
dateFormat = 1;
datetick('x', dateFormat,'keepticks')
Here is the error:
Error using matlab.graphics.axis.decorator.DatetimeRuler/validateTicks Value must be a vector of increasing datetime values.
Error in matlab.graphics.axis.decorator.DatetimeRuler/setTicksDelegate
Walter Roberson
Walter Roberson on 21 Oct 2017
Your date1 appears to be datetime objects, and you appear to be using R2016b or later. In that case you do not use datetick.
figure()
hold on
box on
plot(date1, series1, 'k')
plot(date1, series2, 'r--')
xlabel('Date')
ylabel('Price')
DateString = {'06/30/2010';'11/30/2010'};
ticlocs = datetime(DateString); %R2014b or later
ticlocs.Format = 'dd-MMM-yyyy';
set(gca, 'XTick', ticklocs); %R2016b or later

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More Answers (2)

Peter Perkins
Peter Perkins on 13 Oct 2017
Edited: Walter Roberson on 13 Oct 2017
If you have access to R2016b or later, you will probably be much happier using datetime rather than datenum/datestr, including for plotting:
d = datetime(2015,1,1:500);
x1 = randn(size(d));
plot(d,x1)
ax = gca;
ax.XAxis.TickValues = datetime(2015,1,1)+calquarters(0:6);
ax.XAxis.TickLabelFormat = 'QQQ-yyyy';

  3 Comments

EM
EM on 13 Oct 2017
Can you use this approach to place ticks at specific dates? For example I have 8 specific dates that I'd like to place a tick at. So I cannot simply use a start date and increase it by quarters.
Walter Roberson
Walter Roberson on 13 Oct 2017
Yup. For example,
ax.XAxis.TickValues = datetime(2015,1,1)+days([18 143 207 258]);
ax.XAxis.TickLabelFormat = 'MMM dd';
or
ax.XAxis.TickValues = datetime(2015,[1;5;11;14], [17;5;30;19]);
ax.XAxis.TickLabelFormat = 'yy/M/d';
EM
EM on 13 Oct 2017
Thank you Walter, that is very helpful.

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Med Aymane Ahajjam
Med Aymane Ahajjam on 14 May 2019
In order for the TickLabelFormat to work, at least in my case, I had to specify:
ax.XTickLabelMode = 'manual';
ax.XAxis.TickLabelFormat = 'HH:mm:ss';

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