How to extract row intervals from a table to create a new one.
1 view (last 30 days)
Show older comments
if I have a table
T:
v1 v2 v3 v4
a 1 1 5
b 3 3 7
c 2 5 7
d 5 5 2
e 5 7 7
How could i obtain all the columns from b and d rows as T2 table?
T2:
v1 v2 v3 v4
b 3 3 7
c 2 5 7
d 5 5 2
0 Comments
Answers (2)
Walter Roberson
on 31 Jan 2018
Edited: Walter Roberson
on 31 Jan 2018
T2 = T1(2:4,:);
4 Comments
Walter Roberson
on 1 Feb 2018
Edited: Walter Roberson
on 1 Feb 2018
The == could have difficulty depending on the data type involved. Perhaps you need
first_row = find(strcmp(T1.v1, 'b'), 1, 'first');
last_row = find( strcmp(T1.v1, 'd'), 1, 'first');
Peter Perkins
on 1 Feb 2018
Walter interpreted "all the columns from b and d rows" as "FROM b TO d". I'm going to interpret it as "b AND d".
If the first variable in T has unique values, turn it into the row names, and just subscript:
T.Properties.RowNames = T.Var1;
T.Var1 = [];
t({'b' 'd'},:)
If they're not unique, use ismember to create a logical vector to use as a row subscript.
2 Comments
Walter Roberson
on 1 Feb 2018
No, notice they wanted three lines of results, which can only be explained by wanting a range.
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!