If statement for the structure in table

1 view (last 30 days)
I have a table like this:
%% table info
alphabet = {'A';'A';'B';'A';'C';'D';'C'};
val = [52.1;20.0;13.27;10.49;4.35;4.16;3.78];
relation = {[2,5];[2,5];3;[10,11];2;5;9};
inx = [2;2;5;6;10;12;12];
T = table(alphabet,val,relation,inx);
I have two problems. First, want to find the rows that consist of 'A'.
Second, count the occurrences of 'A', 'B', 'C', and 'D'.
I try to use 'accumarray' but it does not work.

Accepted Answer

madhan ravi
madhan ravi on 12 Oct 2020
Edited: madhan ravi on 12 Oct 2020
FIND_rows_of_A = find(strcmp(T.alphabet, 'A'))
FIND_rows_of_A = find(ismember(T.alphabet, 'A'))
[Alphabets, ~, c] = unique(T.alphabet);
counts = accumarray(c, 1); % use it the right way ;)
Wanted = [array2table(Alphabets), array2table(counts)]
% if you're using recent versions of MATLAB then
Wanted = groupsummary(T, 'alphabet')
Wanted = groupcounts(T, 'alphabet')

More Answers (0)


Find more on Tables 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!