How to show my output from matrix?
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Grace
am 7 Mai 2014
Kommentiert: David Sanchez
am 7 Mai 2014
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.
0 Kommentare
Akzeptierte Antwort
David Sanchez
am 7 Mai 2014
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 Kommentare
David Sanchez
am 7 Mai 2014
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
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!