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Re: Problem with trying to get tight xlim when using time data
Posted:
Oct 24, 2011 3:05 PM


"Steven_Lord" <slord@mathworks.com> wrote in message <j84a3g$1iu$1@newscl01ah.mathworks.com>... > > > "Jesse Sipple" <jesse.sipple@tufts.edu> wrote in message > news:j83u74$i2v$1@newscl01ah.mathworks.com... > > I'm trying to plot just a very small portion of time history data, about 5 > > seconds worth. I have it plotting fine for a larger range, I'm using > > MATLAB time and it displays it no problem. > > > > The problem I'm getting is that it seems like it will only let the limits > > of the xaxis go to about 10 seconds, so anything less than that does not > > work. Any hints? Is there something different than MATLAB time that > > works better for this? > > time = 0:0.1:10; > y = sin(time); > plot(time, y); > xlim([1 1.1]) > > This works fine for me. Can you show the code you're running where it > doesn't appear that MATLAB will allow the limits of the X axes to be less > than 10 seconds apart? > >  > Steve Lord > slord@mathworks.com > To contact Technical Support use the Contact Us link on > http://www.mathworks.com
Here you go:
clear all close all clc
%beginning and end date start_date=datenum('25Sep2011 09:35:05'); end_date=datenum('25Sep2011 09:38:05');
%say sampling rate is 2000Hz step=datenum('25Sep2011 09:35:05.0005')datenum('25Sep2011 09:35:05');
%make vector for time to plot on time=start_date:step:end_date;
%make vector to run sine through time_for_sine=1:length(time);
%create sine signal sine=sin((2*pi*time_for_sine*5)/2000);
% %plotting % figure(1) plot(time,sine), datetick('x',13,'keeplimits'), grid on %this works fine
%now try to zoom in on a 2 second window zoom1=datenum('25Sep2011 09:35:07'); zoom2=datenum('25Sep2011 09:35:09');
figure(2) plot(time,sine), xlim([zoom1 zoom2]),... datetick('x',13,'keeplimits'), grid on,... %this does not zoom in, the limits should read 9:35:07 and 9:35:09
I also tried to manually zoom to a tighter window (in the plot window) and that did not work either. Thanks for looking into this!



