Plot time series in date format from Excel sheet

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Achuan Chen
Achuan Chen on 15 Dec 2021
Commented: Star Strider on 15 Dec 2021
The Excel sheet attached contains a date column, which is in the format dd/mm/yyyy.
I would like to create a time-series plot for the prices contained in table A, with the date displayed on the x-axis.
I've tried to convert the dates in the 'date' column to datetime type, then use the plot() function to create the plot, but apparentlty it is of the wrong data type.
My code:
opts = detectImportOptions('fruitvegprices.csv');%detects import options for the file
opts = setvartype(opts,["variety"],"categorical");%changes variety to categorical
data = readtable('fruitvegprices.csv',opts);%import spreadsheet
%apples
apples = data(data.item=="apples",:); %table of just apples
uniq_apples=unique(apples.variety,'stable');%distinct varieties of apple
item=uniq_apples(8);
A=apples(ismember(apples.variety,item),:)
ts=timeseries(A.price);
date = datetime(A.date,'InputFormat','dd-mmmm-yyyy')
plot(date,ts)
How could I resolve this?
Thank you!

Accepted Answer

Star Strider
Star Strider on 15 Dec 2021
There is nothing wrong with the dates.
Try something like this —
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/834340/fruitvegprices.csv', 'VariableNamingRule','preserve')
T1 = 9148×6 table
category item variety date price unit _____________ ____________________ ______________________ __________ _____ ________ {'fruit' } {'apples' } {'bramleys_seedling' } 2021-11-12 1.49 {'kg' } {'fruit' } {'apples' } {'coxs_orange_group' } 2021-11-12 1.09 {'kg' } {'fruit' } {'apples' } {'egremont_russet' } 2021-11-12 1.14 {'kg' } {'fruit' } {'apples' } {'braeburn' } 2021-11-12 1.01 {'kg' } {'fruit' } {'apples' } {'gala' } 2021-11-12 1.01 {'kg' } {'fruit' } {'apples' } {'other_early_season'} 2021-11-12 0.95 {'kg' } {'fruit' } {'pears' } {'conference' } 2021-11-12 1.04 {'kg' } {'fruit' } {'pears' } {'doyenne_du_comice' } 2021-11-12 1.08 {'kg' } {'fruit' } {'raspberries' } {'raspberries' } 2021-11-12 4.4 {'kg' } {'fruit' } {'strawberries' } {'strawberries' } 2021-11-12 6.24 {'kg' } {'vegetable'} {'beetroot' } {'beetroot' } 2021-11-12 0.51 {'kg' } {'vegetable'} {'brussels_sprouts'} {'brussels_sprouts' } 2021-11-12 0.98 {'kg' } {'vegetable'} {'pak_choi' } {'pak_choi' } 2021-11-12 2.72 {'kg' } {'vegetable'} {'curly_kale' } {'curly_kale' } 2021-11-12 3.26 {'kg' } {'vegetable'} {'cabbage' } {'red' } 2021-11-12 0.55 {'kg' } {'vegetable'} {'cabbage' } {'savoy' } 2021-11-12 0.5 {'head'}
[G,ID] = findgroups(T1.variety) % Group By 'variety'
G = 9148×1
13 27 33 12 36 45 23 31 55 65
ID = 77×1 cell array
{'13_cm' } {'9_cm' } {'all' } {'all_other' } {'all_varieties' } {'all_washed' } {'asparagus' } {'beetroot' } {'black' } {'blackberries' } {'blueberries' } {'braeburn' } {'bramleys_seedling' } {'broad' } {'brussels_sprouts' } {'bulb_brown' } {'bulb_red' } {'butterhead_indoor' } {'calabrese' } {'celeriac' } {'cherry' } {'chinese_leaf' } {'conference' } {'coriander' } {'cos' } {'courgettes' } {'coxs_orange_group' } {'crisp_iceberg_type'} {'cucumbers' } {'curly_kale' }
Gu = unique(G); % Number Of Unique Groups (Information Only, Not Needed For Code)
T1.price(G==G(1),:); % Checking Indexing
figure
plot(T1.date(G==G(7),:), T1.price(G==G(7),:))
hold on
plot(T1.date(G==G(4),:), T1.price(G==G(4),:))
plot(T1.date(G==G(5),:), T1.price(G==G(5),:))
plot(T1.date(G==G(6),:), T1.price(G==G(6),:))
plot(T1.date(G==G(8),:), T1.price(G==G(8),:))
hold off
grid
str = strrep(ID([7 4 5 6 8]), '_','\_');
legend(str, 'Location','best')
xlabel('Date')
ylabel('Price (€)')
Experiment!
.
  2 Comments
Star Strider
Star Strider on 15 Dec 2021
As always, my pleasure!
No worries — this is how we all learn!
.

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