Plot question: Monthly data on yearly axis

Hi all,

I would like to ask how is it possible to plot monthly data on an axis that displays years on the axis.

Many thanks!

[Matt Tearle]

Can you elaborate on what format your data is in? Do you have a time series of monthly observations? Are they serial date numbers, or just integer values, or years with fractional parts, or what? An example would help.

Answer 1

[Oleg Komarov]

You were using datenum incorrectly:

startdate = datenum('31-01-2002','dd-mm-yyyy')
enddate = datenum('31-12-2010','dd-mm-yyyy')
dt = linspace(startdate,enddate,108);
data = rand(numel(dt),1);
plot(dt,data)
datetick('x','yyyy','keepticks')

Answer 2

[Royi Avital]

If I'm guessing right what's your difficulty the fact that plot doesn't show "NaN" values should assist you.

Meaning, Pad your data to the 'x' length with "NaN".

Answer 3

[John Smith]

Thanks for the answers.

Let me give you an example: I got a matrix lets say data with 108 observations and I use the following commands to plot this data and then update the x axis with dates:

startdate = datenum('31-01-2002')
enddate = datenum('31-12-2010')
dt = linspace(startdate,enddate,12);
plot(dt,data)
set(gca,'XTick',dt)
datetick('x','yyyy','keepticks')

tried also: startdate=datenum('01-2002') enddate=datenum('12-2010')

any ideas?

Thanks