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[Help-gsl] comment and code differ in francis.c, line 560,561


From: Kurt Alan Franke
Subject: [Help-gsl] comment and code differ in francis.c, line 560,561
Date: Sun, 2 Nov 2014 23:04:34 +0000

Hello all,

My first post. I am looking at the francis.c file of gsl-1.16, lines 560.. and 
found:

          /* q = max(1, i - 1) */
          q = (1 > ((int)i - 1)) ? 0 : (i - 1);

          /* r = min(i + 3, N - 1) */
          r = ((i + 3) < (N - 1)) ? (i + 3) : (N - 1);

The first comment doesn’t appear to agree with the code below.

i   q   max(1,i-1)
0  0  1 <--
1  0  1 <--
2  1  1
3  2  2
…

Is the comment wrong, or is there an error in the code? I assume the comment 
must be wrong. (?)
Does someone have the Golub book to check?

Kind regards,
Kurt


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