Sum values from one column vector based on another column vector

조회 수: 1(최근 30일)
How do I compute this without using any loops or conditionals?
I want to sum the values in column B based on if the value in column A is a 1
So for example I want to add 34 and 28 only and save it to a new variable
A B
1 34
2 78
4 3
1 28

채택된 답변

DGM
DGM 2022년 7월 4일
편집: DGM 2022년 7월 4일
Assuming A and B are different variable names with the same length:
A = [1; 2; 4; 1];
B = [34; 78; 3; 28];
mysum = sum(B(A==1),'all')
mysum = 62
Assuming they're both columns in the same array:
A = [1 34; 2 78; 4 3; 1 28];
mysum = sum(A(A(:,1)==1,2),'all')
mysum = 62

추가 답변(0개)

범주

Find more on Loops and Conditional Statements in Help Center and File Exchange

제품

Community Treasure Hunt

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

Start Hunting!

Translated by