how to count number of zeros in each row and column?

4 ビュー (過去 30 日間)
Firas Al-Kharabsheh
Firas Al-Kharabsheh 2016 年 4 月 9 日
編集済み: dpb 2016 年 4 月 10 日
how can count the number of zeros in each row and in each column like this
A = [ 1 1 0 1 0 1
0 0 1 0 1 0
1 1 0 0 0 1
0 0 1 0 1 0]
B = [ 2
4
3
4 ]
C = [ 2 2 2 3 2 2 ]

回答 (1 件)

dpb
dpb 2016 年 4 月 9 日
編集済み: dpb 2016 年 4 月 10 日
You're not tryin'...
>> sum(~A,2)
ans =
2
4
3
4
>> sum(A==0)
ans =
2 2 2 3 2 2
>>
NB: The latter if A is something other than [0,1]. Showed two alternatives for variety, there are a number of other, particularly when using the special characteristics of the specific values given.
ADDENDUM Actually, ~A is safe for Matlab irrespective of the values of A as long as exact zero is the criterion (that is, no "approximately equal" small floating point values) as anything nonzero is treated as T. This isn't so in some other languages.
  4 件のコメント
Walter Roberson
Walter Roberson 2016 年 4 月 10 日
function [B, C] = nnz_function(A)
B = sum(~A,2);
C = sum(~A);
dpb
dpb 2016 年 4 月 10 日
Wonder if would be worth having optional second arg of DIM for nnz??

サインインしてコメントする。

カテゴリ

Help Center および File ExchangeMatrix Indexing についてさらに検索

Community Treasure Hunt

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

Start Hunting!

Translated by