Extract from a table based on a non numerical input

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Patrick Lonergan
Patrick Lonergan 2021년 7월 15일
답변: Cris LaPierre 2021년 7월 15일
Hi,
I am simply trying to create a table for each of the machine IDs.
I want to extract all rows in the collumn that have the same machine ID. If it was numerical I would simply use some logic but I am unable to and the ('==') function does not work
I want to extract the rows based on collumn one (SAPID). A screenshot of the table can be seen below. The inputs in collumn one are of the form similiar to XXX01X01.

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Cris LaPierre
Cris LaPierre 2021년 7월 15일
What is the error message you are getting? Please share the full error message (all red text).
If your syntax is correct, it should work. See how to access data in a table page here.
% Set up table
SAPID = ["WDS01A04";"WDS01A04";"WDS01A05"];
TimeStamps = datetime(2019,01,01)+hours(0:2)';
ActPower_Value_mean = [3608;3608;3608];
NacelTmp_Value_mean = [32;32;32];
ConvTmp2_Value_mean = [45.0229;45.1712;45.2676];
dataT = table(SAPID,TimeStamps,ActPower_Value_mean,NacelTmp_Value_mean,ConvTmp2_Value_mean)
dataT = 3×5 table
SAPID TimeStamps ActPower_Value_mean NacelTmp_Value_mean ConvTmp2_Value_mean __________ ____________________ ___________________ ___________________ ___________________ "WDS01A04" 01-Jan-2019 00:00:00 3608 32 45.023 "WDS01A04" 01-Jan-2019 01:00:00 3608 32 45.171 "WDS01A05" 01-Jan-2019 02:00:00 3608 32 45.268
% Extract just rows with SAPID of "WDS01A04"
mchn1 = dataT(dataT.SAPID=="WDS01A04",:)
mchn1 = 2×5 table
SAPID TimeStamps ActPower_Value_mean NacelTmp_Value_mean ConvTmp2_Value_mean __________ ____________________ ___________________ ___________________ ___________________ "WDS01A04" 01-Jan-2019 00:00:00 3608 32 45.023 "WDS01A04" 01-Jan-2019 01:00:00 3608 32 45.171

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