multiply along

2012 6 6
2 个回答
回答已采纳
7 次查看（30 天）

0 个投票

~EDITED'
Hi there, I have a long matrix 1000 x 34 want to do the cumulative multiplication left to right to give a 1000 x 1 matrix then the sum of the multiplication going downwards. So like a sum function but multiplying each element going sideways then downwards.
EDITED THIS ANSWER HAS BEEN ANSWERED but need a follow on answer...

请先登录，再回答此问题。

 采纳的回答

Oleg Komarov
Oleg Komarov 2012-6-6

1 个投票

sum(cumprod(A))

2 个评论
显示 无 隐藏 无

Mate 2u
Mate 2u 2012-6-6
What if their are zeros. Is there a line code to change all zeros to 1s?
Walter Roberson
Walter Roberson 2012-6-6
T = A;
T(T==0) = 1;
sum(cumprod(T))

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2012-6-6

0 个投票

If the numbers are strictly positive, you could log() and cumsum() and exp() the result.

类别

在 帮助中心 和 File Exchange 中查找有关 Entering Commands 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by