Question

How to make this matrix using Matlab
A =
1 3 0 0
-3 3 3 0
1 -3 5 3
0 1 -3 7
How to make this matrix using Matlab
A =
1 3 0 0
-3 3 3 0
1 -3 5 3
0 1 -3 7
@Mathematics

Answer 1

Type it exactly like I have below

A=[1 3 0 0
-3 3 3 0
1 -3 5 3
0 1 -3 7]

Answer 2

How if using diagonal x=(1 3 5 7) to built this matrix

Answer 3

diag([1 3 5 7])

Answer 4

diag([1 3 5 7])

ans =

1 0 0 0
0 3 0 0
0 0 5 0
0 0 0 7
How to change 0 -> 3 and 0 -> -3

Answer 5

you want to change all the 0's to 3's ?

Answer 6

yes, I mean how to create matrix A using x =(1 3 5 7)

Answer 7

a row matrix x=[ 1 3 5 7]

Answer 8

if you want to change one entry you can by doing this

A(2,1)=-3

Answer 9

OK, Thanks

Answer 10

for i=1:3;A(1+i,i)=-3;end