How can I plot a table with data and time ?

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Coginator
Coginator 2021-3-30
回答： Cris LaPierre 2021-3-30
Hi
I have a Problem. I have a 94x4 table with one time array and thre arrays with data.
the time array has the formation
00:14:49
00:29:49
00:44:49
....
for example
the data are
0.104
0.106
0.111
...
Im using this script:
data = readtable("xxx.csv");
plot(data.time,data.A1,data.A2,data.A3);
hold on
grid on
plot(data.time,data.A1,data.A2,data.A3);
xlabel("Zeit"),ylabel("Trübung")
legend('A1', 'A2','A3','location','best')
How can i convert the data form time in a formation that works?
Sorry for my bad englisch... hope someone can help me

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采纳的回答

Cris LaPierre
Cris LaPierre 2021-3-30
Ran in:
What data type are you using to store your times? If you make it a duration, it will work.
time = ["00:14:49"; "00:29:49"; "00:44:49"];
A1 = rand(3,1);
A2 = rand(3,1);
A3 = rand(3,1);
data = table(time,A1,A2,A3)
data = 3×4 table
time A1 A2 A3 __________ ________ _______ ________ "00:14:49" 0.54936 0.65717 0.034715 "00:29:49" 0.038974 0.79033 0.57317 "00:44:49" 0.86261 0.0525 0.067554
% Converte time to duration
data.time = duration(data.time,'InputFormat','hh:mm:ss')
data = 3×4 table
time A1 A2 A3 ________ ________ _______ ________ 00:14:49 0.54936 0.65717 0.034715 00:29:49 0.038974 0.79033 0.57317 00:44:49 0.86261 0.0525 0.067554
Note that your plot syntax will create 2 lines
  1. (data.time, data.A1) and
  2. (data.A2, data.A3)
You also repeat the plot command twice. You only need in once.
I assume you want 3 lines, all with time as the x value. In that case, try the following (assuming time is now a duration).
plot(data.time,data{:,["A1","A2","A3"]})

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