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In matlab I have used accumarray() to create a new vector with 3 columns of integers. Column 1: date (just the day); Column 2: hour; Column 3: Sample Value.

19.0000    9.0000   25.6937
19.0000   10.0000   30.2616
19.0000   11.0000   32.2840
19.0000   12.0000   28.4867
19.0000   14.0000   35.4055
19.0000   16.0000   48.3377

Right now my code for plotting the graph involves the following;

xdate = datenum(year,month,day,hourVector,minutes,seconds);

plot(xdate,sampleValue,'-x','MarkerSize',10)

datetick('x','ddd HHPM')

I'm having trouble finding a method where the x-axis is labeled once every hour (or 2 hours). Thanks

agamesh
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James
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1 Answers1

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I guess you just want the x ticks to be spaced by 1 hour, independently of the data spacing? From your example, I don't see that you necessarily have a data point once an hour.

If my understanding is correct, try replacing

datetick('x','ddd HHPM')

with the following:

hr_step = 0.0417; % increasing datenum by this amount will advance date by 1 hour
tick_xdate = min(xdate):hr_step:max(xdate);
set(gca,'XTick',tick_xdate)
datetick('x','ddd HHPM','keepticks') % 'keepticks' option forces the use of tick_xdate
Dave Kielpinski
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