how to change datatip from datenum format to datestr format

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endystrike
endystrike 2020-5-5
评论： endystrike 2020-5-5
Hi everyone,
basically I'm trying to change datatip properties, in particular I'm trying to change the format of datatips for dates from datanum format to a string format (as 'dd/MM/yyyy').
In this case, the variables plotted are:
  • 'dates': contains the dates as "datenum" format so its format is 'double';
  • 'ptot_cumpl' and 'capInit' are 'double' format variables.
  • I'm trying to understand how to do it for the "Total Portfolio" line that is the subplot1, then I'll do the same for all the others.
aa = plot(dates,ptot_cumpl+capInit,'k-','LineWidth',2);
xlim([dates(1) dates(end)+20]);
datetick ('x','mmm YYYY','keeplimits','keepticks');
grid on;
ytickformat('usd');
aa.DataTipTemplate.DataTipRows(1).Label = 'Date';
aa.DataTipTemplate.DataTipRows(2).Label = 'Cum Profit';
aa.DataTipTemplate.DataTipRows(2).Format = '%.0f';
Then I tried to change the values for "DataTipRows(1)" but I got this error:
aa1 = dataTipTextRow('Date',datestr(dates,'dd/MM/yyyy'));
aa.DataTipTemplate.DataTipRows(1) = aa1;
Error using matlab.graphics.datatip.DataTipTemplate/set.DataTipRows
Value must be a string scalar or a character vector with the name of a data property, such as 'XData', or it must be a vector or a function handle.
I tried also writing the last 2 lines as follows but it seems all the contained data is applied to each x axis step:
aa.DataTipTemplate.DataTipRows(1) = datestr(dates,'dd/MM/yyyy');
Warning: Error creating or updating Text
Error in value of property String
Text length might be too long to display.
Warning: Error creating or updating Text
Error in value of property String
Text length might be too long to display.
Warning: Error creating or updating Text
Error in value of property String
Text length might be too long to display.
Warning: Error creating or updating Text
Error in value of property String
Text length might be too long to display.
I tried then also converting the date variable to a string array but I get again an error.
aa.DataTipTemplate.DataTipRows(1) = string(datestr(dates));
Error using matlab.graphics.datatip.DataTipTemplate/set.DataTipRows
Label must be either a string scalar or character vector.
Thanks everyone! ;)

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采纳的回答

Cris LaPierre
Cris LaPierre 2020-5-5
编辑：Cris LaPierre 2020-5-5
I would suggest converting your dates to datetimes. Then you can just set the formatting of your displayed dates to be whatever you want.
dates = datetime(2012,01,01,0,0,0):days(1):datetime(2012,12,31,24,0,0);
temp = rand(size(dates));
aa = plot(dates,cumsum(temp));
aa.DataTipTemplate.DataTipRows(1).Label = 'Date';
aa.DataTipTemplate.DataTipRows(1).Format = "dd/MM/yyyy";
aa.DataTipTemplate.DataTipRows(2).Label = 'Cum Profit';
  1 个评论
endystrike
endystrike 2020-5-5
solved following your suggestions, thanks a lot! ;)
date_ax = datetime(dates,'ConvertFrom','datenum');
aa = plot(date_ax,ptot_cumpl+capInit,'k-','LineWidth',2);
aa.DataTipTemplate.DataTipRows(1).Label = 'Date';
aa.DataTipTemplate.DataTipRows(1).Format = "dd/MM/yyyy";
aa.DataTipTemplate.DataTipRows(2).Label = 'Cum Profit';
aa.DataTipTemplate.DataTipRows(2).Format = '%.0f';
xlim([date_ax(1) date_ax(end)+20]);
datetick ('x', 'mmm YYYY', 'keeplimits', 'keepticks');
grid on;
ytickformat('usd');

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