getting info from a unique ID in a csv

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Jorge Young
Jorge Young 2020-12-4
评论： dpb 2020-12-4
Thank you in advance for help on this.
I am fairly new to matlab, and I am trying to figure out how to find values in a .csv relating to each individual ID. For example, how can I find the time that each elevator ID reaches the 2nd floor for the first time?

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dpb
dpb 2020-12-4
编辑：dpb 2020-12-4
Power of the MATLAB table comes fore...
tElev=readtable('elevatorexample.csv');
FindFloor=2; % the floor to find
rowfun(@(f,t) t(find(f==FindFloor,1)),tElev,'InputVariables',{'floor','time'}, ...
'GroupingVariables','elevatorID', ...
'OutputVariableNames',"FirstTimeToFloor "+FindFloor)
ans =
6×3 table
elevatorID GroupCount FirstTimeToFloor 2
__________ __________ __________________
1 6 2
2 5 2
3 5 1
4 5 2
5 4 1
6 4 1
>>
  2 个评论
Jorge Young
Jorge Young 2020-12-4
This is fantastic, thank you very much!
dpb
dpb 2020-12-4
Yeah, read up on grouping variables and the rowfun, varfun functions. There's whole section on splitapply for more discussion as well.

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