question of applying sum() to the matrix with zero values

4 次查看（过去 30 天）
mahesh chathuranga
my matrix is X=[1 0 0 ;0 0 0;0 9 0](actual matrix is larger than this and having less values more zoros) my question is ,when applying sum(X),it gives error message "??? Subscript indices must either be real positive integers or logicals."

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-9-7
You've probably used sum as a variable in your code. Try this
clear sum
X=[1 0 0 ;0 0 0;0 9 0]
sum(X)
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2013-9-7
Be aware that sum will be over columns and will be a ax3 array. If you want the sum of the whole array, you can do this:
theSum = sum(X(:));
which turns X into a 1D vector before it gets summed. theSum will then be a scalar (single number) rather than a 1 by 3 array.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 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