I'm trying to call patch without permanently changing my X axis from a datetime array.

Question

Bill 2017-10-9

3
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360488-i-m-trying-to-call-patch-without-permanently-changing-my-x-axis-from-a-datetime-array

评论： Jonas Bauer 2022-6-9

Hi. I'm trying to call patch without permanently changing my X axis from a datetime array. Here is an example of what I'm trying to do. The call to temporarily change the data type in XData is not working. Any suggestions?

% Create data & plot
x = datetime(2017,1,1) + caldays(1:31);
y = rand(1,31);
plt = plot(x, y);
% Convert X axis to a double
plt.XData = datenum(plt.XData);
% Shade patch area
Ys = ylim;
Y1 = [Ys(1),Ys(2),Ys(2),Ys(1)]; 
x1 = datenum(datetime(2017,1,14));
x2 = datenum(datetime(2017,1,21));
ptch = patch([x1 x1 x2 x2], Y1, [0 0 0]);
ptch.FaceAlpha = .15;
% Convert X axis back to a datetime type
plt.XData = datetime(plt.XData, 'ConvertFrom', 'datenum');

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2017-10-9

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360488-i-m-trying-to-call-patch-without-permanently-changing-my-x-axis-from-a-datetime-array#answer_284981

编辑：Walter Roberson 2020-5-15

在 MATLAB Online 中打开

x = datetime(2017,1,1) + caldays(1:31);
y = rand(1,31);
plt = plot(x, y);
hold on
x1 = datetime(2017,1,14);
x2 = datetime(2017,1,21);
fx = [x1 x2 x2 x1 x1]
Ys = ylim;
fy = [Ys(1) Ys(1) Ys(2) Ys(2) Ys(1)];
fill( fx, fy, [0 0 0], 'FaceAlpha', 0.15);
hold off

4 个评论
显示 2更早的评论隐藏 2更早的评论

Walter Roberson 2020-5-15

Please show your call to datetime() that is triggering the problem, including showing the class() of each of the variables you are passing in.

Jonas Bauer 2022-6-9

Works perfectly!

请先登录，再进行评论。

Answer 2

Sean de Wolski 2017-10-9

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360488-i-m-trying-to-call-patch-without-permanently-changing-my-x-axis-from-a-datetime-array#answer_284980

在 MATLAB Online 中打开

Use fill instead of patch.

% Create data & plot
x = datetime(2017,1,1) + caldays(1:31);
y = rand(1,31);
plt = plot(x, y);
% Convert X axis to a double
% plt.XData = datenum(plt.XData);
% Shade patch area
Ys = ylim;
Y1 = [Ys(1),Ys(2),Ys(2),Ys(1)]; 
x1 = (datetime(2017,1,14));
x2 = (datetime(2017,1,21));
ptch = fill([x1 x1 x2 x2], Y1, [0 0 0]);
ptch.FaceAlpha = .15;