How to make second x axis with names of areas on chart?

I wanted to make a second x axis on the top of my chart, which would show dates for areas on chart:

-gray -04.04.2020

-white-05.04.2020

-green-06.04.2020

and etc. to 11.04.2020.

This is my code. For h5L1, h5L2, h5L3 I use [1008 series for x] for question purposes.

;clc

%clear all

close all

x=[1:1008];

h5L1=[1008 series for x];

h5L2=[1008 series for x]];

h5L3=[1008 series for x]];

figure

y=[1.1 1.1]

area([0 35],y, 'FaceColor', [0.9 0.9 0.9],'LineStyle','none');

hold on

area([180 323],y, 'FaceColor', [0.9 1.0 0.9],'LineStyle','none');

hold on

area([468 611],y, 'FaceColor', [0.9 0.9 1.0],'LineStyle','none');

hold on

area([756 899],y, 'FaceColor', [1.0 0.9 0.9],'LineStyle','none');

hold on

plot(x, h5L1, x, h5L2, x, h5L3)

ax=gca

xticks([1 24:24:1008])

xticklabels({'18:10','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00'})

xtickangle(-60)

xlim([1,1008])

ylim([0,1.1])

Answer 1

[Ameer Hamza]

You need to create two axes object. Following code shows a simple demo. Adapt it according to your requirement

fig = figure();
ax1 = axes();
ax1.Box = 'on';
plot(rand(1,10));

ax2 = axes();
hold(ax2);
ax2.Position = ax1.Position;
ax2.Color = 'none';
ax2.XAxisLocation = 'top';
ax2.YAxis.Visible = 'off';
plot(NaT, NaN); % to make x-axis datetime
ax2.XLim = [datetime(2020, 1, 1) datetime(2020, 1, 10)];

[Aleksandra Pawlak]

Thank you!

But I have one more 'cosmetic' question: how can i move dates to display in the middle of areas?

[Aleksandra Pawlak]

When i do it manually on chart I lose first date:

[Ameer Hamza]

Can you show how you are giving the axes labels on the top axes? You can specify the location and labels manually.

[Aleksandra Pawlak]

figure

ax1 = axes();

ax1.Box = 'on';

y=[1.1 1.1]

area([0 35],y, 'FaceColor', [0.9 0.9 0.9],'LineStyle','none');

hold on

area([180 323],y, 'FaceColor', [0.9 0.9 0.9],'LineStyle','none');

hold on

area([468 611],y, 'FaceColor', [0.9 0.9 0.9],'LineStyle','none');

hold on

area([756 899],y, 'FaceColor', [0.9 0.9 0.9],'LineStyle','none');

hold on

plot(x, h5L1, x, h5L2, x, h5L3)

%legend('04.04.2001','06.04.2001','08.04.2001','10.04.2001')

ax=gca

xticks([1 24:24:1008])

xticklabels({'18:10','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00','22:00','02:00','06:00','10:00','14:00','18:00'})

xtickangle(-60)

xlim([1,1008])

ylim([0,1.1])

ax2 = axes();

hold(ax2);

ax2.Position = ax1.Position;

ax2.Color = 'none';

ax2.XAxisLocation = 'top';

ax2.YAxis.Visible = 'off';

plot(NaT, NaN); % to make x-axis datetime

ax2.XLim = [datetime(2001, 4, 4) datetime(2001, 4, 11)];

[Aleksandra Pawlak]

I know that I can do it manually, but (like in the screenshots) - when I move "5th April" to the middle of the white area I lose "4th April" from the axis. So, I want to set dates in the middle of area- in case of 4th Apr it needs to be at the "0" od axis. I know that it's only "cosmetic" thing, but it's really important in this case and I have no idea how to do it.

[Ameer Hamza]

Change the last part of you code to

ax2.XLim = [datetime(2001, 4, 4) datetime(2001, 4, 11)]+hours(8);
ax2.XTick = [ax2.XLim(1) ax2.XTick];
drawnow;
ax2.XAxis.TickLabelFormat = 'MMM dd';

[Aleksandra Pawlak]

It works! Thank you!