how to generate matrix with any size in same pattern
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
-2 1 0 0 0 0
1 -2 1 0 0 0
0 1 -2 1 0 0
0 0 1 -2 1 0
0 0 0 1 -2 1
0 0 0 0 1 -2
i need to generate a matrix with pattern like this. how to write a script that the required pattern
for example, if i need 5*5 matrix with the required pattern it will be like this
-2 1 0 0 0
1 -2 1 0 0
0 1 -2 1 0
0 0 1 -2 1
0 0 0 1 -2
or i need 7*7 matrix
-2 1 0 0 0 0 0
1 -2 1 0 0 0 0
0 1 -2 1 0 0 0
0 0 1 -2 1 0 0
0 0 0 1 -2 1 0
0 0 0 0 1 -2 1
0 0 0 0 0 1 -2
Antworten (3)
Andrei Bobrov
am 22 Apr. 2013
Bearbeitet: Andrei Bobrov
am 12 Dez. 2019
n = 5;
out = full(spdiags(ones(n,1)*[1 -2 1],-1:1,n,n));
or
out = zeros(n);
out([2:n+1:end,n+1:n+1:end]) = 1;
out(1:n+1:end) = -2;
or
out = zeros(n);
z = diag(true(n-1,1),-1);
out(z | z') = 1;
out(eye(n) > 0) = -2;
and (after 6.5 years ;)
n = 10;
out = toeplitz([-2 1 zeros(1,n-2)]);
0 Kommentare
Bandar
am 12 Dez. 2019
n=5;
v =-2*ones(1,n);
p =ones(1,n-1);
B =diag(v);
C =diag(p,1);
D =diag(p,-1);
A=B+C+D
The result is
A =
-2 1 0 0 0
1 -2 1 0 0
0 1 -2 1 0
0 0 1 -2 1
0 0 0 1 -2
0 Kommentare
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!