inserting long xtick label

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TESFALEM ALDADA 2020-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/509591-inserting-long-xtick-label

编辑： dpb 2020-3-8

采纳的回答： dpb

Hi,

I wanted to insert long time series of xticklabel for my plot.

I tried manually using:

set(gca, 'xticklabels' ,{'1/1/1990', '1/2/1990', '3/1/1990', . . . since the date length is long (15 years) i could not type all time series. so what is the short cut to inser this xtick?

Thank you

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Star Strider 2020-3-7

See the documentation for plot timeseries.

The other option (if you did not use a datetime array) is to use the datetick function.

TESFALEM ALDADA 2020-3-8

编辑：dpb 2020-3-8

在 MATLAB Online 中打开

ok, i am working to plot using the left and right axis where this method is not woking for me.

furthermore it shows error message when i use a set(gca, ...) option to further process,

maybe see below please

yyaxis left
ts1 = timeseries(Qobs,1:4383);
ts1.Name = 'Daily Count';
ts1.TimeInfo.Units = 'days';
ts1.TimeInfo.StartDate = '01-Jan-2000';   % Set start date.
ts1.TimeInfo.Format = 'mmm dd, yy';       % Set format for display on x-axis.
ts1.Time = ts1.Time - ts1.Time(1);        % Express time relative to the start date.
hL=plot(X,Qobs, 'g', X,Qsim);
ylabel('Flow (m^3/s)')
xlabel('Daily flow')
% legend('Observed','Simulated')
% hL.FaceColor = [1 0 0];
set(gca,'xtick',1:4383,'ylim', [0,12])
plot(ts1)
yyaxis right
hR=bar(X,P,5, 'k'); %
set(gca,'YColor', 'k','Ydir','reverse','ylim',[0,50],'xlim',[1,4383], 'xtick',1:500:4383)
ylabel('Rainfall (mm)')
xlim([1 4383])

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Answer 1

dpb 2020-3-7

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/509591-inserting-long-xtick-label#answer_419015

编辑：dpb 2020-3-8

在 MATLAB Online 中打开

Don't label manually at all; use a datetime variable for the x-axis variable in plot() and you'll get datetime ticklabels automagically.

ADDENDUM:

t=1:4383; t=t.';t=t-t(1);        % number days vector
Qobs=randn(size(t));             % dummy data to match
ts1 = timeseries(Qobs,t);        % create the ts object
ts1.TimeInfo.Units='days';
ts1.TimeInfo.StartDate='01-Jan-2000';
ts1.TimeInfo.Format='mmmyy';     % bug/implementation issue -- uses datenum() strings internally
plot(ts1)
hAx=gca;
xl=xlim;                         % retrieve xlimits
xl(2)=xl(2)+days(1);             % make RH axis end at 1/1 next year
xlim(xl)                         % update xlim, now draws last tick label

produced

Finish up as desired.

Not knowing what X is, no way to know what to do about adding a bar plot at this point...

NB: The bug/implementation snafu on the TS date format string. Setting it to 'MMMyy' as is correct for datetime object produced warning/error when tried to plot as

>> plot(ts1)
Error using matlab.internal.datetime.cnv2icudf (line 157)
Unrecognized minute format.  Format: MMMyy.
Error in timeseries/plot (line 142)
 datetimeTickFormat = matlab.internal.datetime.cnv2icudf(char(h.TimeInfo.Format)); 
>> 

Cap-M is minute field for datenum variables, NOT datetime class which is what the timeseries and new-fangled DatetimeRuler object is for the datetime aware plot functions. In fact, after the plot() line above,

>> hAx.XAxis
ans = 
  DatetimeRuler with properties:
             Limits: [Jan 01, 2000    Jan 01, 2012]
         TickValues: [Jan 01, 2000    Jan 01, 2002    Jan 01, 2004    Jan 01, 2006    Jan 01, 2008    Jan 01, 2010    Jan 01, 2012]
    TickLabelFormat: 'MMMyy'
  Show all properties
>> 

shows it was converted.

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TESFALEM ALDADA 2020-3-8

i tried this way but it dont works for daily time frames. please can you give me some example, and also i have two axis plot; one using plot function and the other axis has bar plot.

how can i adjust for this.

best

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