Plotting use datenum

Hello, I want to make a Matlab plot with the months of the year on the x-axis. I am trying to plot a total of 17520 readings (48 per day) on the y-axis and then show the months on the x-axis. The problem with the code I am using now is that the vectors are different lengths (b is 12 and a is 17520).

Here is my code:

function [y] = doc_concentration
a = xlsread ('DOC_Conc_2007-2011.xlsx',1,'A3:A17522');
startDate = datenum('01-01-2007');
endDate = datenum('12-31-2007');
b = linspace(startDate,endDate,12);

length(a)
length (b)

plot (b,a)
set(gca,'XTick',g)
datetick('x','mmm','keepticks')
end

Can anyone help? Thanks in advance.

Maeve

[Jan]

Please format your code properly using the "{} code" button. I've done this for you this time.

Answer 1

[Jan]

Why do you use 12 bins, if you need 17520? What about:

b = linspace(startDate, endDate, 17530)

[Maeve Ryan]

I tried this now and it's plotting it but only the months Jan, April, July and October along with Jan of the next year which I don't want.

Here's what I tried

function [y] = doc_concentration

a = xlsread ('DOC_Conc_2007-2011.xlsx',1,'A3:A17522');

startDate = datenum('01-01-2007');

endDate = datenum('12-31-2007');

b = linspace(startDate,endDate,17520);

plot (b,a)

set(gca,'XTick',b)

datetick('x','mmm','keeplimits')

end

Any ideas how I can get every month to appear on the x-axis and leaving out January of the next year?

Thanks for your help

[Jan]

Perhaps this helps: set(gca, 'XLim', [startDate, endDate])

Another idea is not to set the XTick values manually, but let DATETICK decide.

[Maeve Ryan]

ok using set (gca,'XLIM',[startDate,endDate}] removed the January label from the next year which helps.

I still cannot figure out how to get every month to appear on the x-axis instead of just every fourth month which is happening now

[Jan]

You can set the ticks explicitely instead of using "set(gca, 'YTick', B'; datetick('x', 'mmm');".