Plotting time series data but data rounding to minute

Hi there,

I am plotting some time series data with the time data formatted as follows; '13/04/2018 01:00:49' However when I plot the data, it is appearing as per the attached image where all the data points appear to rounded to nearest minute ( or just the minute is plotted)

Anyone else come across this?

Thanks

Jack

[Paolo]

Jack, could you please attach the image?

[Jack Naumann]

oops sorry - thanks for highlighting. Please find attached

[Paolo]

Try the following if you want to display full datetime:

 plot(x,y);
 h1 = gcf;
 h1.Children.XAxis.TickLabelFormat = 'dd/MM/yyyy HH:mm:ss'

[Jack Naumann]

Thanks for you reply - unfortunately I am getting the error that the value is not a supported tick label format specification.

[Paolo]

My apologies, the comment was not very clear. You must have a datetime array on the x axis. Try this:

 dates = {'13/04/2018 01:00:49','13/04/2018 02:00:49','13/04/2018 03:00:49','13/04/2018 04:00:49'};

 x = datetime(dates,'InputFormat','dd/MM/yyyy hh:mm:ss');
 y = [1:4];

 plot(x,y);
 h1 = gcf;
 h1.Children.XAxis.TickLabelFormat = 'dd/MM/yyyy HH:mm:ss';

I am using some random values for the x axis. Running on Matlab 2017b.

[Jack Naumann]

No worries, I understood - I have a datetime array on the x-axis already.

I tried your code but got the same error message. I am running 2016a - could that be the issue?

[Paolo]

Could be, you can try different formats and see what format it accepts. If you only wish to display the hours and minutes with not rounded values, try the following:

 h1.Children.XAxis.TickValues = x;
 h1.Children.XAxis.TickLabelFormat = 'HH:mm:ss';

Answer 1

[Peter Perkins]

Jack, what is it that makes you think all the data have been rounded to the nearest minute? Certainly the tick labels are rounded (and thinned to every 10min), but that's just the ticks, not the data.

Which are you concerned about? You should be able to zoom in to see where the actual data are plotted.