Matrix inverse with qr resolution?

Hi! Would somebody be able to help? How do I get matrix inverse with QR resolution?

Answer 1

[Bruno Luong]

>> A=rand(3)

A =

      0.7026    0.9489    0.4899
      0.7449    0.0949    0.3332
      0.5794    0.9151    0.8583

It doesn't look like but this is actually QR resolution:

>> A\eye(length(A))

ans =

      0.8168    1.3388   -0.9859
      1.6320   -1.1671   -0.4786
     -2.2913    0.3405    2.3407

Check

>> inv(A)

ans =

      0.8168    1.3388   -0.9859
      1.6320   -1.1671   -0.4786
     -2.2913    0.3405    2.3407

>>

[Palinkas Mark]

Sorry, I forgot to I don't use these commands:

• \

• /

• inv

• pinv

• linsolve

• ^

• mldivide

• mrdivide

• lsqminnorm

[Bruno Luong]

Then it's a homework, so you have to start with something on your own first.