Vector counting syntax help?

7 views (last 30 days)
James Baker
James Baker on 9 May 2021
Commented: Star Strider on 9 May 2021
if i have a vector A = [1 1 1 1 2 3 3 5 5 5 5 6 6 7]... its alreay been sortecand only increases.. i want to create a 2nd vector based off A say called B that would have the count of each unique values in the A vector... so, B = [3 1 2 3 2 1] .. because there are 3 1's and 1 2 and 2 3's, etc etc. i just cant seem to get the suntax correct... please help.

Accepted Answer

Star Strider
Star Strider on 9 May 2021
Try this —
A = [1 1 1 1 2 3 3 5 5 5 5 6 6 7];
[Au,~,ix] = unique(A,'stable');
Count = accumarray(ix,1);
Result = table(Au(:), Count(:), 'VariableNames',{'Unique_Elements','Count'})
Result = 6×2 table
Unique_Elements Count _______________ _____ 1 4 2 1 3 2 5 4 6 2 7 1
.
  4 Comments
James Baker
James Baker on 9 May 2021
ok.. perfect.. after looking at it for a few... just what i needed thanks
Star Strider
Star Strider on 9 May 2021
As always, my pleasure!

Sign in to comment.

More Answers (0)

Products


Release

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!