change y values in figure to names

I was able to plot temperatures of each hour in the year and got this result using this command:

plot(A(1:8760,5)')

X axis is the hours of the year

Y axis is the temperature vaule of each day

Question:

How can I change the crosses values in X axis to be the months names rather than hours?

i.e.

January instead of 1000

Febraruy instead of 2000

and so on

Answer 1

[Kelly Kearney]

You need to calculate where each month falls, in terms of hours:

ttk = datetime(2019,1:13,1);
set(gca, 'xtick', hours(ttk-datetime(2019,1,1)), 'xticklabel', cellstr(datestr(ttk,'mmm')))

Check the specific year of your data; the alignment will be different in leap years vs non-leap years.

Alternatively, if you actually specify datetime values for your x-values, Matlab will create a date axis that automatically labels things appropriately:

t = datetime(2019,1,1) + hours(1:8760);
plot(t, A(1:8760,5)');

[HG-NU]

Thanks @kelly. It works fine.

Is there any way to center the month's name to be on such day number 15?

Because each month is currently represented at hour 1 on day 1 of the month.

[Kelly Kearney]

If you used option 2 (i.e. plotting with datetimes on the x-axis), you just need to change the location of the x-ticks accordingly:

set(gca, 'xtick', datetime(2019,1:12,15))

[HG-NU]

Unfortunately, the first option

ttk = datetime(2019,1:13,1);
set(gca, 'xtick', hours(ttk-datetime(2019,1,1)), 'xticklabel', cellstr(datestr(ttk,'mmm')))

not work. and this is the result

If I use the first option, then I cannot see how this option will read the data of temperatures from my table?

[Kelly Kearney]

I suggest you take some time to really understand the commands you are using. I gave you a few different suggestions for how to modify the plotted axis, but you need to understand how Matlab is using your data to create a plot.

In your original example, you plotted the data without providing any x data. When you do this, Matlab automatically assigns the x-data to be integer values. In your case, that means the x-axis can be interpreted as hours relative to some reference start time, and you can assign your tick marks accordingly:

A = -cos(linspace(0,2.*pi,8760)) + randn(1,8760); % pseudo-data
 
% Option 1
 
subplot(2,1,1);
 
plot(A); % same as plot(1:8760,A)
 
ttk = datetime(2019,1:12,15); % desired tick locations, as datetimes
tklbl = cellstr(datestr(ttk, 'mmm')); % labels you want to match these ticks
xtk = hours(ttk - datetime(2019,1,1)); % tick locations in hours
 
set(gca, 'xtick', xtk, 'xticklabel', tklbl);

A second option would be to pass the plot some datetime values as x-data, so that Matlab will add a date axis to the plot and take care of formatting the tick labels.

subplot(2,1,2);
t = datetime(2019,1,1) + hours(1:8760);
plot(t, A);
set(gca, 'xtick', ttk);

Both of these options will get you the desired ticks:

Answer 2

[BN2]

Hello

In your question you said y but it seems you mean x; anyways,

Try this:

names = {'January'; 'February'; 'March'; 'April'; 'May'; 'June'; 'July'; 'August'; 'September';...
    'October'; 'November'; 'December'};
set(gca,'xtick',[1:12],'xticklabel',names)

But:

You have 10 month ?

So you end in october? so this is:

names = {'January'; 'February'; 'March'; 'April'; 'May'; 'June'; 'July'; 'August'; 'September';...
    'October'};
set(gca,'xtick',[1:12],'xticklabel',names)

I hope it helps you.

[HG-NU]

This is the result of X axis :

Unfortunately, it does not solve the issue.

[BN2]

Try this:

set(gca,'xtick',1:10,...
 'xticklabel',{'January'; 'February'; 'March'; 'April'; 'May'; 'June'; 'July';...
 'August'; 'September'; 'October'})
% if you have 12 months change 10 to 12 and also type name of othee months

I think previous code not worked because of "[]"