How do i plot temperature vs date and time?

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Niclas Dahlman
Niclas Dahlman 2012-11-12
Hey
I´m trying to plot data from a matrix looking like this: 3 columns with several measurements each day at different times.
Day Time Temp 1 09:00 16 2 09:00 16.2
and so on.
I want to create a plot with temp on y axis and day AND time on the x axis. So far i managed to plot the temp vs time, but this generates a graph with many different lines but not separated by day som they all end upon top of each other.
I need a command that makes matlab differentiate between the days, not only the time.
Ive been looking at commands like xtick, datetick etc but i dont get how to create what im looking for using these commands.
Thanks in advance for tips and hints.

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回答（2 个）

Star Strider
Star Strider 2012-11-12
The datenum function might be what you need.
  1 个评论
Niclas Dahlman
Niclas Dahlman 2012-11-13
Thanks for your reply Star Strider. Going to try this later today, one prolem I think of is the separation of date and time in two different columns. Can i somehow merge column 1 and 2 so datenum uses all the information at once, both date and time? Maybe there is an easier way to sort the data?

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Andrei Bobrov
Andrei Bobrov 2012-11-13
编辑：Andrei Bobrov 2012-11-13
file yourdata.txt have values:
Day Time Temp
1 09:00 16
2 09:00 16.2
...
solution
f = fopen('yourdata.txt');
c = textscan(f,'%f %s %f','HeaderLines',1);
fclose(f);
d = [c{1}-1 + rem(datenum(c{2},'HH:MM'),1), c{3}];

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