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pre-set axis limit to datetime

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Yu Li
Yu Li on 22 Feb 2022
Commented: Steven Lord on 19 Feb 2023
Hi:
I have a figure and I want to set the x-axis to 'datetime' type before add any plot there, below is the code:
figure
ax=gca;
ax.XLim=[datetime('now'),datetime('now')+day(1)]
Matlab reported error like below:
Value must be a 1x2 vector of numeric type in which the second element is greater than the first element or is Inf.
however, the code below works:
figure
ax=gca;
ax.XLim=[1,2]
and the code below works:
ax=gca;
ax.XLim=[1,2]
figure
plot([datetime('now'),datetime('now')+day(1)],[1,1])
so, it seems like the Matlab do not accept set the x-axis to datetime if no 'datetime' type plot added to the figure.
is there anyway can address this issue?
Thanks!
Yu

Accepted Answer

Seth Furman
Seth Furman on 25 Feb 2022
The axis ruler can be set directly to a DatetimeRuler.
ax = axes;
ax.XAxis = matlab.graphics.axis.decorator.DatetimeRuler;
ax.XLim = [datetime(2020,1,1) datetime(2020,1,2)];
  4 Comments
VBBV
VBBV on 19 Feb 2023
Edited: VBBV on 19 Feb 2023
figure
ax=gca;
ax.XAxis = matlab.graphics.axis.decorator.DatetimeRuler;
plot(ax,[datetime('now','TimeZone', 'America/New_York'),datetime('now','TimeZone', 'America/New_York')+day(2)])
cla(ax)
ax.XLim = [datetime('now','TimeZone', 'America/New_York'),datetime('now','TimeZone', 'America/New_York')+day(2)]
Value must be a 1x2 vector of numeric type in which the second element is greater than the first element or is Inf.
ax.YLim = [ 0 1]
if cla(ax) is used as told, it still produces the same error
Steven Lord
Steven Lord on 19 Feb 2023
If you don't want a visible line on your axes you could plot using NaN as the Y data.
N = datetime('now','TimeZone', 'America/New_York');
plot(N, NaN);
xlim([N, N+days(2)])
ylim([0 1]);

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