Import and plot .CSV with timestamp

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Ancalagon8 2018-11-7

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评论： Ancalagon8 2018-11-8

1.jpg

I have a csv file along with timestamp and i cannot manage to plot my data correctly. My file is comma delimited, first date, then time and 3 different sensor values.. I can plot sensor values as datapoints but i need also the time.. Anyone eho can help?

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Guillaume 2018-11-7

An actual file instead of a picture of it would be a lot more useful for us to test.

i cannot manage to plot my data correctly. To tell what you did wrong we need to know what you did.

Ancalagon8 2018-11-7

data3.csv

@Guillaume

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Guillaume 2018-11-7

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I'm not sure what you're doing wrong since you haven't shown us what you're doing. The following may be what you're after:

t = readtable('data3.csv');
t.datetime = t.(1) + t.(2);  %merge date and time into one variable
plot(t.datetime, t{:, 3:5});

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Guillaume 2018-11-8

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Well, most likely the error you actually received was Invalid Expression as I forgot a closing bracket. You must have added the bracket in the wrong place.

t.datetime = datetime(strcat(t{1, 1}, {' '}, t{1, 2})) + ... %timing of 1st sample
             seconds(1/125) * (0:height(t)-1)';  %cumulatively add 1/125 second to  timing of each sample

Or since you don't really care about the actual acquisition time of the samples, you could simply ignore the time information from the text file and do:

plot(seconds(1/125) * (0:height(t)-1), t{:, 3:5})

Ancalagon8 2018-11-8