How to plot timeseries graph

I have 7 months of dissolved oxygen data through a water column (March, April, May, June, July, August, November) I need to plot this as a timeseries but I'm unsure on where to start.

How do I plot the bottom water oxygen concnetrations against each month they were taken?

The excel file attatched is one example of the data.

[Mathieu NOE]

hello

how are the data sampled ? I assume the attached xlsx file does not cover the entire 7 monthes ?

you want to plot each seperate month (one plot = one month ? )

Answer 1

[Mathieu NOE]

hello again

a sample code that can help you

% data format (7 columns)
% depth	temp	salin	sig	    chl	    DO	    DO%
% -5	9,491	35,311	27,281	0,59	285,5	100,31

% assuming one data = one day
% how many days in each month : 
% March : 31 , April : 30 , May : 31 , June : 30 , July : 31, August : 31 , November : 30

monthes = {'March','April','May','June','July','August','November'};
days_per_month = [31  30  31  30  31 31  30];


filename = "mar2014ctd2.xlsx";  % extended data length to cover the 7 month / 1 data per day range

C = readcell(filename);
[m,n] = size(C);
data = cell2mat(C(2:m,:)); % start at row index 2 to ignore header line

stop_index = 1; % init
%% plot
for ci = 1: length(days_per_month)
    start_index = stop_index;
    stop_index = start_index-1 + days_per_month(ci);
    x_axis = 1:1:days_per_month(ci);
    DO_extract = data(start_index:stop_index,6);        % 6th column = DO
    
     figure(ci), plot(x_axis,DO_extract,'*-');grid
     title(monthes(ci));
     xlabel('Days');
     ylabel('DO');
 
end