pltoting a variable with dates on horizontial axis
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Hello,
I am importing a data from excel by clicking on excel file and than click import.
the first column in my data is date, that is year , quarter. I want to create a plot of the variables. that i have done but in the figure i want to have date on the horizontal axis. I am having trouble in having date on the horizontal axis.
and i want to shade some of the periods in my plot. like from 1948 to 1950.
Please help me how i can do that.
2 Comments
Stephen23
on 6 Sep 2018
I want to get the picture like this. Please let me now who i can do this. thanks
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/196205/image.png)
Answers (2)
jonas
on 5 Sep 2018
Edited: jonas
on 12 Sep 2018
Here is something you can work from. I used a trick with the stairs and area functions to make the shaded bars. It may have been a bit overkill to use datetime in this case, but I could not resist. You can skip the first part if you'd prefer to use fraction years.
% load data
data=xlsread('MacroData.xlsx');
t=data(:,1);
y=data(:,7)
% Convert to datetime
year = floor(t);
fyear = years(mod(t,1));
ts=datetime(year,1,1)+fyear;
%Plot data
figure
hold on
h=plot(ts,y)
% fancy some shading? write list of [start time1; end time1; start time2; end time2...] and so on:
t2=[11 1948;10 1949;7 1953;5 1954;6 1957;4 1958;4 1960;2 1961;12 1969;11 1970;11 1973;3 1975;1 1980;7 1980;7 1981;11 1982;7 1990;3 1991;3 2001;11 2001;12 2007;6 2009]
t2=datetime(0,t2(:,1),1)+years(t2(:,2))
y2=zeros(1,length(t2))
y2(1:2:end)=1e6
% Fix shading
[xs,ys]=stairs(t2,y2)
ha=area(xs,ys,'facecolor',[0 0 0],'facealpha',.5,'edgecolor','none')
ylim([min(y) max(y)])
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/195043/image.jpeg)
11 Comments
Walter Roberson
on 9 Sep 2018
mydata = xlsread('MacroData.xlsx');
t = mydata(:,1);
TIME = datenum([floor(t), round(mod(t,1)*30-2), 0*t+1]); %converts quarters from .1, .2, .3, .4 into appropriate months
y = mydata(:,2);
myrecessions = {'November 1948' , 'October 1949' ; 'July 1953', 'May 1954' ; 'August 1957', 'April 1958' ; 'April 1960' , 'February 1961' ; 'December 1969', 'November 1970' ; 'November 1973', 'March 1975' ; 'January 1980', 'July 1980' ; 'July 1981' , 'November 1982' ; 'July 1990' , 'March 1991' ; 'March 2001' , 'November 2001' ;
'December 2007' , 'June 2009' };
recessions_datenum = reshape(datenum(myrecessions(:), 'mmmm yyyy'),size(myrecessions));
figure(3)
plot(TIME,y)
recessionplot('recessions', recessions_datenum);
datetick('x','yyyy')
xlim(datenum([1948 1 1; 2011 12 31]))
Tested. But you should re-check which column of data you want to plot: before it was column 7 but you seem to have switched to column 2.
Peter Perkins
on 12 Sep 2018
If possible, use datetimes, not datenums. Jonas' answer seems good, except I think it isn't correct when dealing with the non-standard way that quarters are encoded as fractional years (as tenths!). I thik this would do it:
y = floor(t);
q = 10*years(mod(t,1)); % maybe even round this?
ts = datetime(y,1,1) + calquarters(q);
4 Comments
Walter Roberson
on 13 Sep 2018
The input data had year numbers and .1 .2 .3 .4 but no .5 or higher fraction, and the question stated "quarters".
jonas
on 13 Sep 2018
Thanks guys, I did not realize the fraction refered to quarter.
@Peter: Thanks a lot for the elaborate explanation. Did not know about calyear, which seems great for dealing with those annoying leap years!
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