Reporting mistake in the GSL reference, release 2.7

[顾加银]

Dear GSL developers

     I am Jiayin Gu, a GSL user from China. I recently found maybe a mistake in 
the GSL reference, 2.7.  In the description of LU decomposition (Section 14.1). 
It states that

"The j-th column of the matrix P is given by the k-th column of the identity 
matrix, where k = p_j the j-th element of the permutation vector."

However, I tested this LU decomposition routine and found that the statement 
should be replaced by

"The j-th column of the identity matrix is placed as the k-th column of the 
matrix P, where k=p_j the j-th element of the permutation vector."




I tested this on Ubuntu 20.04 with g++ compiler. The GSL library is installed 
with the command "sudo apt install gsl-bin". Executing the command "sudo apt 
install --upgrade gsl-bin" gives  "gsl-bin is already the newest version 
(2.5+dfsg-6build1)." in the print. The attachment is the test code.




I hope the developers can fix this issue.

Best regards




Jiayin Gu

Main.cpp
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