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

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Bill
Bill on 9 Oct 2017
Commented: Jonas Bauer on 9 Jun 2022
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');

Accepted Answer

Walter Roberson
Walter Roberson on 9 Oct 2017
Edited: Walter Roberson on 15 May 2020
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
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More Answers (1)

Sean de Wolski
Sean de Wolski on 9 Oct 2017
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;

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