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pre-set axis limit to datetime

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Yu Li
Yu Li 2022-2-22
评论： Steven Lord 2023-2-19
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

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采纳的回答

Seth Furman
Seth Furman 2022-2-25
Ran in:
The axis ruler can be set directly to a DatetimeRuler.
https://www.mathworks.com/help/matlab/ref/matlab.graphics.axis.decorator.datetimeruler-properties.html
ax = axes;
ax.XAxis = matlab.graphics.axis.decorator.DatetimeRuler;
ax.XLim = [datetime(2020,1,1) datetime(2020,1,2)];
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VBBV
VBBV 2023-2-19
编辑：VBBV 2023-2-19
Ran in:
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 2023-2-19
Ran in:
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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