How to show my output from matrix?

2 ビュー (過去 30 日間)
Grace
Grace 2014 年 5 月 7 日
コメント済み: David Sanchez 2014 年 5 月 7 日
Hi everyone, i have
c= 1 1 1; 2 4 8; 3 9 27; 4 16 64
I extracted each row by c(1,:), c(2,:), c(3,:) and c(4,:). I want to find which row of the greatest common divisor (gcd) value with 5 is equal to 1 for each of the elements in the row vector.
ind=find(gcd(c(1,:),5)==1)
The answer gives me 1 2 3 if this command is used. I want the output is 1 as I am only interested in which row gives me all gcd value is 1.
How can i do this?
Thanks.

採用された回答

David Sanchez
David Sanchez 2014 年 5 月 7 日
For all your rows:
gcd(c(k,:),5) = [1 1 1];
Then,
find(gcd(c(3,:),5)==1) = [1 2 3]
since all the elements in the first operation equal 1 (for all rows)
You want to the first element fulfilling the condition:
ind=find(gcd(c(3,:),5)==1,1)
ind =
1
  2 件のコメント
Grace
Grace 2014 年 5 月 7 日
Hi David,
I wish to find which row gives me all the value is 1.
Since for all my rows: gcd(c(k,:),5)=[1 1 1];
Then the output I want to get should 1 2 3 4 because all 4 rows give me [1 1 1].
For example, if the first row and third row give me [1 1 1]. then the output should be 1 3.
The output ind shows which row gives me [1 1 1].
David Sanchez
David Sanchez 2014 年 5 月 7 日
more clear now. The [1 2 3] you get from your commands correspond to the elements within each row and not to the rows of C, which is what you want.
You can do something like this though:
c= [1 1 1; 2 5 8; 3 9 27; 4 16 64];
N = size(c,1);
idx = zeros(N,1);
for k=1:N
v = all(gcd(c(k,:),5) == 1); % v = 1 if all the elements of row == 1
if v
idx(k) = k;
end
end
idx will contain the rows that fulfil your condition

サインインしてコメントする。

その他の回答 (0 件)

カテゴリ

Help Center および File ExchangeCreating and Concatenating Matrices 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