time on x axis

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charles atlas
charles atlas am 21 Nov. 2011
I have the following code
fid = fopen('file.txt','rt');
X = textscan(fid,'%s%s%f%s%s%s%f%f%f%f%s%s%s%s',...
'HeaderLines',7);
fclose(fid);
time= X{1}; ydata=X{10};
start=time(1,1); done=time(end);%retrieve start and end time
startDate = datenum(start);
endDate = datenum(done);
xData = linspace(startDate,endDate,...
length(time));%./(length(time)./15)));
plot(xData,ydata)
set(gca,'XTick',xData)
datetick('x','HH:MM:SS','keepticks')
grid on
This plots some data against time data that I take from a huge data file. The problem is that there are so many plot points that the date data on the x axis is all jumbled together. How do I add something to the code to make only like every 10 minutes of time data be displayed instead of displaying every second and having it all jumbled together?

Akzeptierte Antwort

Fangjun Jiang
Fangjun Jiang am 21 Nov. 2011
can you try to skip the "set(gca,'XTick',xData)" line and use the default xtick set by plot()?

Weitere Antworten (1)

Alex
Alex am 21 Nov. 2011
shorter_data = resample(xData, down_size_factor)
down_size_factor should be a whole number. Using 2 will skip every other data point and leave you with half the original data points.

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