Cumulative sum between two trues in array according to positions stored in logical array

2 次查看（过去 30 天）
Enrico Gambini
Enrico Gambini 2022-10-17
编辑： Matt J 2022-10-17
Hello!
I would like to find a fast way to get cumulative sums of values of an array according to the starting and ending positions given by a logical array,
for instance:
v=[0;1;2;0;2;4;5;6;2;3;4];
pos=[true;false;true;false;false;true;false;true;false;false;true];
I would like the code to cumulative sum vector "x" between two trues, getting the following result:
result=[3;8;15;15]; %I summed [2+1+0;4+2+0+2;6+5+4;4+3+2+6]
Hope that the question is clear, thank you!

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2022-10-17
编辑：Matt J 2022-10-17
Ran in:
v=[0;1;2;0;2;4;5;6;2;3;4];
pos=[true;false;true;false;false;true;false;true;false;false;true];
cv=cumsum(v);
I=find(pos);
result = cv(I(2:end))-cv(I(1:end-1)) +v(I(1:end-1))
result = 4×1
3 8 15 15

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

产品


版本

R2021a

Community Treasure Hunt

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

Start Hunting!

Translated by