How do I set YAxis of Axes from a numeric ruler to a datetime ruler?

Question

Victor Esparza 2019-1-7

1
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https://ww2.mathworks.cn/matlabcentral/answers/438687-how-do-i-set-yaxis-of-axes-from-a-numeric-ruler-to-a-datetime-ruler

评论： Adam Danz 2021-2-11

I would like to dynamically set the Yaxis to a datetime ruler.

Example Code:

figure;
aa=axes;
set(aa,'YAxis', matlab.graphics.axis.decorator.DatetimeRuler);

I get the following error:

Error

Error using matlab.graphics.axis.Axes/set

You cannot set the read-only property 'YAxis' of Axes.

I was able to set the xaxis to a datetime ruler but, the yaxis is set as read-only for some reason.

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dpb 2019-1-7

I'm guessing this is a non-supported feature that TMW expects that if you want a datetimeruler axis that you'll create the axis with such. Doc for the axes object implies such.

Seems like there could be a time and place to be able to do this programmatically, I'd agree...submit enhancement request.

nanren888 2019-1-7

Will datetick() do?

I know, just another numeric ruler, but it does some things.

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Answer 1

Cris LaPierre 2019-1-7

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在 MATLAB Online 中打开

This can be handled automatically if your Y variable is a datetime.

td = datetime(datestr(now + [0:10]'),'Format','MMM-dd');
x = 0:10;
plot(x,td)

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Adam Danz 2021-1-19

编辑：Adam Danz 2021-1-19

在 MATLAB Online 中打开

Another undocumented method of ruler conversion to numeric, datetime, duration or categorical:

% ax is the axis handle
ax = axes(); 
% samp is a sample of data used to format the axis ruler
% and must be numeric, datetime, duration, categorical 
% array or an objects which can be converted to double. 
samp = datetime(datestr(now + [0:10]'),'Format','MMM-dd');
% To change x axis
matlab.graphics.internal.configureAxes(ax, samp, 1)
% To change y axis
matlab.graphics.internal.configureAxes(ax, 1, samp)
% To change both x and y axes
matlab.graphics.internal.configureAxes(ax, samp, samp)

And it works for other data types such as categorical

samp = categorical({'A', 'B', 'C'});
matlab.graphics.internal.configureAxes(ax, samp, 1)     % x axis
matlab.graphics.internal.configureAxes(ax, 1, samp)     % y axis
matlab.graphics.internal.configureAxes(ax, samp, samp)  % x & y axis

And with mixed ruler types between x and y axes

samp_x = categorical({'A', 'B', 'C'});
samp_y = datetime(datestr(now + [0:10]'),'Format','MMM-dd');
matlab.graphics.internal.configureAxes(ax, samp_x, samp_y)

Eric Delgado 2021-2-11

在 MATLAB Online 中打开

Unfortunately it is not possible to change the ruler of an axes. It is a read only property. The simplest and natural solution is just put a new data under the old data.

fig = figure;
ax = axes(fig);
data1 = line(ax, 1:10, linspace(datetime([2020 12 01]), datetime([2020 12 10]), 10))
ax.YAxis
% You have a datetime ruler axes.
cla
data1 = line(ax, 1:10, 1:10)
ax.YAxis
% And now you have a numerical ruler axes.

Adam Danz 2021-2-11

> Unfortunately it is not possible to change the ruler of an axes

Yes it is, in at least some contexts. Cris and I both share methods directly above.

To clarify your solution, cla() is the only reason it works. When you clear the axis, it's a blank slate and the axes will respond to the data classes again. If you remove cla from your answer, it no longer works. But it's a good point. Clearing the axis is a solution. But it doesn't really convert the axes. It just resets them.

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How do I set YAxis of Axes from a numeric ruler to a datetime ruler?

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