Getting row id of data

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Sarmed Wahab
Sarmed Wahab 2022-6-5
评论： Walter Roberson 2022-6-6
I have a large data set of over 22 lac rows. This data comprises of 251 zones in Washington and out of these zones I am interested in only 30 zones. I used groupsummary to get the frequency of occurance of the a specific zone.
groupsummary(data,"PickupZone")
Now I want to get the row id of a specific PickupZone, for that I require some help on how to get the row id of every occurance of Astoria.
Then I will use that row id to assign a new variable in table for the regions comprising of those zones.

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回答（1 个）

KSSV
KSSV 2022-6-5
Let T be your table. And you want to seperate Astoria from T into another table T1.
idx = strcmp(T.PickupZone,'Astoria') ;
T1 = T(idx,:) ;
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Sarmed Wahab
Sarmed Wahab 2022-6-6
Thanks for the help, I have figured out how to get his done.
t3 = ismember(taxi_all.PickupZone, {'Alphabet City','Astoria'})
this returns 1 at the place of occurance of these values.
from there I can replace those 1's with the region name.
Walter Roberson
Walter Roberson 2022-6-6
taxi_all.RegionName(idx)

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