MATLAB: How to plot monthly values of precipitation over multiple years and have years plotted on x-axis

bar chart

I have a table with headings of year, month, and value where the value is the total precipitation of the month. I would like to make a bar chart that has the year plotted on the x-axis, but I'd also like to color-code each year's worth of data (12 bars, one for each month) to make it clear where one year starts and another ends. How do I do this?

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How do I reshape my array that is in the form (year, month, data value): 1991, 1, 45.2 1991, 2, 84.3 1991, 3, 23.3 1991, 4, 97.1 ... 2016, 12, 17.4 Into the form jan feb mar apr may .... dec 1991 45.2 84.3 23.3 97.4 .... ... 2016 .... 17.4

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MATLAB: How is datevec used on an m*8 matrix in the form [YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, Day of Year, Value]

data = [1980  1  1  0  0  0  1  -27
1980  1  1  1  0  0  1  -20
1980  1  1  2  0  0  1  -23
1980  1  1  3  0  0  1  -28
1980  1  1  4  0  0  1  -32
1980  1  1  5  0  0  1  -32
1980  1  1  6  0  0  1  -32
1980  1  1  7  0  0  1  -31
1980  1  1  8  0  0  1  -33];
d = data(:,1:end-2) ;
val = data(:,end) ;
date = datetime(d) ;
plot(date,val)

MATLAB: Seasonal average over years

Try this demo:

% Make sample data
temps = randi(100, 84, 1)
% Reshape to a month by year array.

tempsByMonth = reshape(temps, 12,7)
% Extract the May - October months.
mayThroughOct = tempsByMonth(5:10,:)
% Get the means over all those extracted months.
meanMayOct = mean(mayThroughOct(:))

Of course it could be make into a more cryptic, obtuse one liner if you wanted, but I went for understandability.

If you have the Image Processing Toolbox, you have mean2() so it can be shortened to

tempsByMonth = reshape(temps, 12,7) % Reshape to a month by year array.
meanMayOct = mean2(tempsByMonth(5:10,:)) % Get the means over extracted months.

and still be fairly readable.

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MATLAB: How is datevec used on an m*8 matrix in the form [YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, Day of Year, Value]

MATLAB: Seasonal average over years

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