Summing Associated Values without Loop
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Jackson Jewett
am 29 Nov. 2022
Kommentiert: Jackson Jewett
am 29 Nov. 2022
I have an nx2 matrix. Some elements in the first column repeat. I am interested in the elements in the second column that correspond to respective unique values in the first column. For each given unique value in the first column, I would like to sum each of the corresponding values in the second column. Ultimately, I would like to generate a new matrix in which every unique element in the first column is represented once, with the sum of its corresponding elements in the second column. The matrices I am using are huge, so I would like to do this without loops, but I cannot find a method to do so. Does anyone have any advice? Thank you!!
As an example, if given A, I would like to produce A' without using a loop:
A = [ 1 2
5 7
1 -1
3 5
5 2
1 7]
A'= [1 8
5 9
3 5]
0 Kommentare
Akzeptierte Antwort
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Loops and Conditional Statements finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!