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trying to graph the time series vs variables but it produces an error in the time column, can someone help me, indicating where the error is here please
T = readtable('prueba.csv')
T.Date.Format = 'yyyy-MM-dd';
T.Time.Format = 'HH:mm:ss';
myDatetime = T.Date + timeofday(T.Time)
y1 = T{:,7};
plot(myDatetime,[y1],'r-','lineWidth',1)
When I try to graph I get an error in the line highlighted in bold, tks for your support.

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Star Strider
Star Strider 2021-6-21
编辑：Star Strider 2021-6-21
Ran in:

0 个投票

Ran in:
The ‘Time’ variable is a duration array, so the timeofday call is not necessary.
Try this —
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/660400/prueba.csv', 'VariableNamingRule','preserve')
T1 = 78×8 table
No. Date Time mm {p} {t} {pd} {q} ___ __________ ________ ___ ______ ______ ________ ______ 1 2021-06-01 00:00:00 615 175.27 77.267 4.9991 784.46 2 2021-06-01 00:00:05 175 175.39 77.267 9.1318 1104.3 3 2021-06-01 00:45:35 198 172.1 76.443 0.79982 501.5 4 2021-06-01 00:45:45 163 171.62 76.914 1.4664 472.85 5 2021-06-01 01:31:05 195 175.63 75.972 9.665 1070.8 6 2021-06-01 01:31:15 210 169.3 74.794 6.6655 0 7 2021-06-01 02:16:35 188 178.07 76.384 -0.3 1021.8 8 2021-06-01 02:16:45 209 169.43 75.559 3.966 0 9 2021-06-01 03:02:15 166 177.22 74.617 -0.20002 652.62 10 2021-06-01 03:02:25 177 170.89 73.91 -0.16669 0 11 2021-06-01 03:47:45 182 177.7 74.912 3.3327 720.6 12 2021-06-01 03:47:55 196 178.43 73.675 14.064 0 13 2021-06-01 04:33:25 186 171.01 75.029 -0.20002 1330.3 14 2021-06-01 04:33:35 201 175.02 57.951 153.41 3392.7 15 2021-06-01 05:18:55 180 3.7731 78.504 -0.3 0 16 2021-06-01 05:19:05 193 4.8685 78.445 27.929 594.22
MyDateTime = T1.Date + T1.Time;
MyDateTime.Format = 'yyyy-MM-dd HH:mm:ss';
T2 = [T1(:,1) table(MyDateTime) T1(:,[4:end])]
T2 = 78×7 table
No. MyDateTime mm {p} {t} {pd} {q} ___ ___________________ ___ ______ ______ ________ ______ 1 2021-06-01 00:00:00 615 175.27 77.267 4.9991 784.46 2 2021-06-01 00:00:05 175 175.39 77.267 9.1318 1104.3 3 2021-06-01 00:45:35 198 172.1 76.443 0.79982 501.5 4 2021-06-01 00:45:45 163 171.62 76.914 1.4664 472.85 5 2021-06-01 01:31:05 195 175.63 75.972 9.665 1070.8 6 2021-06-01 01:31:15 210 169.3 74.794 6.6655 0 7 2021-06-01 02:16:35 188 178.07 76.384 -0.3 1021.8 8 2021-06-01 02:16:45 209 169.43 75.559 3.966 0 9 2021-06-01 03:02:15 166 177.22 74.617 -0.20002 652.62 10 2021-06-01 03:02:25 177 170.89 73.91 -0.16669 0 11 2021-06-01 03:47:45 182 177.7 74.912 3.3327 720.6 12 2021-06-01 03:47:55 196 178.43 73.675 14.064 0 13 2021-06-01 04:33:25 186 171.01 75.029 -0.20002 1330.3 14 2021-06-01 04:33:35 201 175.02 57.951 153.41 3392.7 15 2021-06-01 05:18:55 180 3.7731 78.504 -0.3 0 16 2021-06-01 05:19:05 193 4.8685 78.445 27.929 594.22
EDIT — (21 Jun 2021 at 19:58)
With respect to the plot —
figure
plot(T2.MyDateTime, T2.('{pd}'), '-r', 'LineWidth',1)
grid
xlabel('Date & Time')
ylabel('\{pd\}')
title('\{pd\} as a function of time')
.

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Excuse the question, does it have to do with R2017b? Because I have tried to run the script that you have provided and it throws me an error in the console, I have also deleted the 'VariableNamingRule' and 'Preserve', because it did not allow me to continue with the iteration
T1 = readtable('prueba.csv')
MyDateTime = T1.Date + T1.Time;
MyDateTime.Format = 'yyyy-MM-dd HH:mm:ss';
T2 = [T1(:,1) table(MyDateTime) T1(:,[4:end])]
figure
plot(T2.MyDateTime, T2.('{pd}'), '-r', 'LineWidth',1)
grid
xlabel('Date & Time')
ylabel('\{pd\}')
title('\{pd\} as a function of time')
Command Window said:
Error using Untitled4 (line 2)
Addition is not defined between datetime arrays.
Tks
Star Strider
Star Strider 2021-6-21
There was no release posted, so I assume R2012a. The 'VariableNamingRule' (or variations of it) were introduced after R2017b. Just refer to the variables by their column numbers instead.
In R2021a, the ‘Time’variable is automatically a duration array. Using the time function on the ‘Time’ variable should convert it to a duration array. Try that. If it does, the rest of my code should work.
.

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