add a vector as a timetable element

2020 12 8
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Hi,
I would like to write the column of a matrix as element of a timetable (meaning a column for each time). in this timetable I have other variables that have a scalar value at each time. Any suggestion on how to do it?
Cheers,
Giacomo

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Cris LaPierre
Cris LaPierre 2020-12-8
编辑：Cris LaPierre 2020-12-8
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Ran in:
A column for each time? Do you mean row?
Just add it as a new variable in your timetable. Each column is typically a separate variable.
indoors = readtimetable('indoors.csv')
indoors = 60x2 timetable
Time Humidity AirQuality ___________________ ________ __________ 2015-11-15 00:00:24 36 80 2015-11-15 01:13:35 36 80 2015-11-15 02:26:47 37 79 2015-11-15 03:39:59 37 82 2015-11-15 04:53:11 36 80 2015-11-15 06:06:23 36 80 2015-11-15 07:19:35 36 80 2015-11-15 08:32:47 37 80 2015-11-15 09:45:59 37 79 2015-11-15 10:59:11 36 80 2015-11-15 12:12:23 37 80 2015-11-15 13:25:35 37 79 2015-11-15 14:38:46 36 83 2015-11-15 15:51:58 37 80 2015-11-15 17:05:10 36 80 2015-11-15 18:18:22 37 80
% Create temperatures
tempF = randi(100,[height(indoors),1]);
% Add vector of temperatures to timetable
indoors.Temp = tempF
indoors = 60x3 timetable
Time Humidity AirQuality Temp ___________________ ________ __________ ____ 2015-11-15 00:00:24 36 80 75 2015-11-15 01:13:35 36 80 17 2015-11-15 02:26:47 37 79 6 2015-11-15 03:39:59 37 82 92 2015-11-15 04:53:11 36 80 74 2015-11-15 06:06:23 36 80 98 2015-11-15 07:19:35 36 80 72 2015-11-15 08:32:47 37 80 65 2015-11-15 09:45:59 37 79 1 2015-11-15 10:59:11 36 80 84 2015-11-15 12:12:23 37 80 45 2015-11-15 13:25:35 37 79 23 2015-11-15 14:38:46 36 83 65 2015-11-15 15:51:58 37 80 5 2015-11-15 17:05:10 36 80 46 2015-11-15 18:18:22 37 80 10

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giacomo labbri
giacomo labbri 2020-12-9
Thanks for you detail answer but this is not what I am trying to do. Referring to the example:
I would like to add for each time in the initial time table a vector that is the temperature at different heights (and this are stored in a matrix in which each column correspond to a time, this is why I said column but it is not the central part of the problem).
So my table (using your example) would have for each time one value of humidity, one value of air quality and a vector that is the temperature at - lets say 10 - different heights.
This temperatures are stored into a matrix that has a column for each time and a row for each height (so in the example 10 rows and 60 colums).
Hope I managed to explained myself.
Thanks again!
Giacomo
Cris LaPierre
Cris LaPierre 2020-12-9
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Ran in:
Still not a problem. Can we assume the times in your timtable rows align with the times of your matrix colums?
Updating the example slightly.
% Creating a 60x2 timetable
indoors = readtimetable('indoors.csv');
% Creating a matrix with 4 heights x 60 times (reduced for visual purposes only)
tempF = randi(100,[4,60]);
% Add temps to timetable under a variable Temp
% Transopose tempF so that rows are times, and columns are heights
indoors.Temp = tempF'
indoors = 60x3 timetable
Time Humidity AirQuality Temp ___________________ ________ __________ _______________________ 2015-11-15 00:00:24 36 80 4 16 47 59 2015-11-15 01:13:35 36 80 23 3 13 91 2015-11-15 02:26:47 37 79 76 34 90 13 2015-11-15 03:39:59 37 82 76 24 12 41 2015-11-15 04:53:11 36 80 92 76 25 39 2015-11-15 06:06:23 36 80 67 85 37 63 2015-11-15 07:19:35 36 80 20 4 29 68 2015-11-15 08:32:47 37 80 41 60 98 99 2015-11-15 09:45:59 37 79 64 48 15 14 2015-11-15 10:59:11 36 80 56 26 100 31 2015-11-15 12:12:23 37 80 67 74 55 74 2015-11-15 13:25:35 37 79 57 2 46 16 2015-11-15 14:38:46 36 83 84 54 16 35 2015-11-15 15:51:58 37 80 87 21 12 23 2015-11-15 17:05:10 36 80 61 73 34 78 2015-11-15 18:18:22 37 80 69 81 66 73
If you want each height to be its own variable, you can use the splitvars function.
indoors = splitvars(indoors,'Temp','NewVariableNames',["H1" "H2" "H3" "H4"])
indoors = 60x6 timetable
Time Humidity AirQuality H1 H2 H3 H4 ___________________ ________ __________ __ __ ___ __ 2015-11-15 00:00:24 36 80 4 16 47 59 2015-11-15 01:13:35 36 80 23 3 13 91 2015-11-15 02:26:47 37 79 76 34 90 13 2015-11-15 03:39:59 37 82 76 24 12 41 2015-11-15 04:53:11 36 80 92 76 25 39 2015-11-15 06:06:23 36 80 67 85 37 63 2015-11-15 07:19:35 36 80 20 4 29 68 2015-11-15 08:32:47 37 80 41 60 98 99 2015-11-15 09:45:59 37 79 64 48 15 14 2015-11-15 10:59:11 36 80 56 26 100 31 2015-11-15 12:12:23 37 80 67 74 55 74 2015-11-15 13:25:35 37 79 57 2 46 16 2015-11-15 14:38:46 36 83 84 54 16 35 2015-11-15 15:51:58 37 80 87 21 12 23 2015-11-15 17:05:10 36 80 61 73 34 78 2015-11-15 18:18:22 37 80 69 81 66 73
If you need help in accessing your data in the table, see this documentation page.
giacomo labbri
giacomo labbri 2020-12-9
Thanks! This was very helpful!

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