Plot question: Monthly data on yearly axis

Question

John Smith 2011-4-8

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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!

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Matt Tearle 2011-4-9

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.

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Answer 1

Oleg Komarov 2011-4-9

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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')

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Answer 2

Royi Avital 2011-4-9

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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".

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Answer 3

John Smith 2011-4-9

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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')