Plot data with time
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I'm trying to plot my data with time on the x-axis. My data has the following csv format:
13:05:48 1.33 5.15
13:05:53 2 5.2
13:05:58 2.1 4.88
There are 3 columns with column 1 being my time(HH:MM:SS) and column 2 and 3 being my data. How do I read then plot Column 1 time vs. my column 2 or 3?
采纳的回答
[d,x,y]=textread('ivan.csv','%8s %f %f','delimiter',' ');
dn=datenum(d,'HH:MM:SS'); % ERRATUM: had lowercase in time format string
plot(dn,[x y])
datetick('x')
Alternatively, use textscan or with the latest releases there's a new datetime object
3 个评论
Ivan Q
2015-8-18
Ivan Q
2015-8-19
dpb
2015-8-20
Ah, yes, I carelessly used lower case for the time fields in the format string; that's an error, sorry. Checked that the textread worked right but didn't actually look a the the returned times on the axes, only that they were actually formatted as dates...I fixed up the Answer altho you've uncovered the problem.
I tend to use textread where I can even though it has been relegated to "red-haired stepchild" status by TMW as it doesn't require the extra step of fopen/fclose and returns char and double arrays where don't need or want cell arrays. It does require a separate variable for each field which can be a nuisance and can't handle all cases that textscan can, but for simple file structures it's a better option imo still. Anyway, that's an aside not related to the actual problem here...
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