There is an error in the Matlab document

C=gallery('uniformdata',[5 4], 0);
[Q,R] = qr(C);
[Q,R] = qr(C,0);
[Q,R,P] = qr(C)
Q =
    -0.3522  0.8398  -0.4131
    -0.7044  -0.5285  -0.4739
    -0.6163  0.1241  0.7777
R =
    -11.3578  -8.2762
    0    7.2460
    0    0
P =
    0   1

Of course I can not get these Q,R and P, but it certainly in Matlab Offical pdf Documents (MATLAB Primer, P3-31).

[madhan ravi]

What error ? What is your question?

[zhenyu zeng]

You can not get that Q,R and P with those numbers.

[KALYAN ACHARJYA]

@zhenyu I am getting the same result as mentioned in Matlab document file. Is there any issue?

Q =
   -0.6191   -0.1406    0.1899   -0.5058   -0.5522
   -0.1506   -0.4084   -0.5034    0.5974   -0.4475
   -0.3954    0.5564   -0.6869   -0.1478    0.2008
   -0.3167   -0.6676   -0.1351   -0.1729    0.6370
   -0.5808    0.2410    0.4695    0.5792    0.2207
R =
   -1.5346   -1.0663   -1.2010   -1.4036
         0   -0.7245   -0.3474    0.0126
         0         0   -0.9320   -0.6596
         0         0         0    0.6648
         0         0         0         0
Q =
   -0.6191   -0.1406    0.1899   -0.5058
   -0.1506   -0.4084   -0.5034    0.5974
   -0.3954    0.5564   -0.6869   -0.1478
   -0.3167   -0.6676   -0.1351   -0.1729
   -0.5808    0.2410    0.4695    0.5792
R =
   -1.5346   -1.0663   -1.2010   -1.4036
         0   -0.7245   -0.3474    0.0126
         0         0   -0.9320   -0.6596
         0         0         0    0.6648
Q =
   -0.2404    0.5849   -0.1207    0.5297   -0.5522
   -0.5544   -0.0343   -0.0737   -0.6970   -0.4475
   -0.5434   -0.4896   -0.5272    0.3831    0.2008
   -0.2431    0.6454   -0.2655   -0.2193    0.6370
   -0.5296   -0.0236    0.7947    0.1967    0.2207
R =
   -1.6874   -0.8816   -1.3607   -1.2765
         0    0.9406    0.3537    0.5433
         0         0   -0.6745    0.1277
         0         0         0    0.6435
         0         0         0         0
P =
     0     0     0     1
     0     1     0     0
     0     0     1     0
     1     0     0     0
>> 

[zhenyu zeng]

@KALYAN @KALYAN ACHARJYA

In you link, please click 'QR Factorization' and you can find this:

[Q,R,P] = qr(C)

Q =

-0.3522 0.8398 -0.4131

-0.7044 -0.5285 -0.4739

-0.6163 0.1241 0.7777

R =

-11.3578 -8.2762

0 7.2460

0 0

P =

0 1

1 0

It is weird because we can not get that.