How to remove white space from beginning of a plot and adjust x-axis to start from 'January'?

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Anwesha Sharma
Anwesha Sharma 2023-2-14
评论： Anwesha Sharma 2023-2-18
I have a plot with monthly data over multiple years. But there is a white space in the beginning of the plot that I want to remove. If I use 'axis tight' or 'xlim([1 12])', then 'January' from the x-axis disappears (refer to image 'Temp_fig.jpg'). I want the x axis as 'Jan Feb Mar Apr Oct Nov Dec'.
T = table(datestr(Temp6ONDJFMAcorrect.DATE,'dd/mm/yyyy',),Temp6ONDJFMAcorrect.Temp);
[y,m,d] = datevec(T.Var1,'dd/mm/yyyy');
Tdate = table(y,m,d,'VariableName',{'year','month','day'});
TT = [Tdate,T(:,{'Var2'})];
TT.Properties.VariableName{4} = 'Temp';
yrs = TT.year;
yr = ismember(str2double(string(TT.year)),yrs);
x = reshape(TT.monthly(yr),7,[]);
y = reshape(TT.Temp(yr),7,[]);
plot(x,y)
xticklabels({'Jan', 'Feb','Mar','Apr','Oct','Nov','Dec'})
%% xlim([1,12]) %% this removes the white space but 'Jan' from x-ticks also disappears (see 'Temp_fig_1.jpg')

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采纳的回答

VBBV
VBBV 2023-2-14
xticks(1:7)
xticklabels({'Jan', 'Feb','Mar','Apr','Oct','Nov','Dec'})
You can try the above
  2 个评论
Anwesha Sharma
Anwesha Sharma 2023-2-14
编辑：Anwesha Sharma 2023-2-14
It's still not working, the axis labels are not equally spaced and there is still a space in front of the plot after I run:
xticks(1:7)
xticklabels({'Jan', 'Feb','Mar','Apr','Oct','Nov','Dec'}) .
I am not sure how to fix that.
VBBV
VBBV 2023-2-14
编辑：VBBV 2023-2-15
Ran in:
plot(1:7) % your plot
xlim([1 12]) % try with both
xticks(1:12) % use 1:12 instead of 1:7
xticklabels({'Jan', 'Feb','Mar','Apr','Oct','Nov','Dec'})

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更多回答（1 个）

Cris LaPierre
Cris LaPierre 2023-2-17
编辑：Cris LaPierre 2023-2-17
Ran in:
Perhaps a bit more difficult to understand at first, but here's another way to do it using findgroups and splitapply.
file = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1295380/Temp_6_ONDJFMA_correct.csv';
opts = detectImportOptions(file);
opts = setvaropts(opts, "DATE","InputFormat","dd/MM/yyyy");
T = readtable(file,opts);
% Need to create x values that are shared across all years so they overlap
% Here, I create a copy of DATE and change the year so all are 1960
T.plotDATE = T.DATE;
T.plotDATE.Year = year(T.DATE(1))
T = 441×3 table
DATE Temp plotDATE __________ _______ __________ 01/01/1960 -5.6962 01/01/1960 01/02/1960 -10.261 01/02/1960 01/03/1960 -16.191 01/03/1960 01/04/1960 -21.453 01/04/1960 01/10/1960 -19.267 01/10/1960 01/11/1960 -12.483 01/11/1960 01/12/1960 -8.3811 01/12/1960 01/01/1961 -9.1333 01/01/1960 01/02/1961 -8.1571 01/02/1960 01/03/1961 -21.066 01/03/1960 01/04/1961 -20.587 01/04/1960 01/10/1961 -17.296 01/10/1960 01/11/1961 -9.8484 01/11/1960 01/12/1961 -8.5044 01/12/1960 01/01/1962 -8.6625 01/01/1960 01/02/1962 -12.851 01/02/1960
% Find groups
G = findgroups(year(T.DATE));
% Plot. Need 'figure' since 'hold on' is used before first plot command
figure
hold on
splitapply(@(x,y)plot(x,y),T(:,["plotDATE","Temp"]),G)
hold off
% A datetime axis will include the year. This removes that by manually
% labeling X Ticks
ax = gca;
xlbls = ax.XTickLabel;
ax.XTickLabel = xlbls;
Since you have to manually label the XTicks anyway, another way to do this is create a Month column with the month names as categoricals. The categorical function lets you specify an ordered set. The plot is a little bit different (space between Y axis and Jan)
T2 = readtable(file,opts);
T2.Month = categorical(month(T2.DATE,"monthofyear"),...
1:12,{'Jan','Feb','Mar','Arp','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'})
T2 = 441×3 table
DATE Temp Month __________ _______ _____ 01/01/1960 -5.6962 Jan 01/02/1960 -10.261 Feb 01/03/1960 -16.191 Mar 01/04/1960 -21.453 Arp 01/10/1960 -19.267 Oct 01/11/1960 -12.483 Nov 01/12/1960 -8.3811 Dec 01/01/1961 -9.1333 Jan 01/02/1961 -8.1571 Feb 01/03/1961 -21.066 Mar 01/04/1961 -20.587 Arp 01/10/1961 -17.296 Oct 01/11/1961 -9.8484 Nov 01/12/1961 -8.5044 Dec 01/01/1962 -8.6625 Jan 01/02/1962 -12.851 Feb
G = findgroups(year(T2.DATE));
figure
hold on
splitapply(@(x,y)plot(x,y),T2(:,["Month","Temp"]),G)
hold off

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