02-28-2012
@Chihung
Thanks for explaining with comment.
This is now readable for amateur for awk like me.
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03.097
03.094
03.093
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input:
chr1 1 2 3
chr1 1 2 4
chr1 2 4 5
chr2 3 6 9
chr2 3 6 10
Code:
awk '{a+=$4}END{for (i in a) print i,a}' input
Output:
chr112 7
chr236 19
chr124 5
Desired output:
chr1 1 2 7
chr2 3 6 19
chr1 2 4 5 (1 Reply)
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dlas2.f(3) LAPACK dlas2.f(3)
NAME
dlas2.f -
SYNOPSIS
Functions/Subroutines
subroutine dlas2 (F, G, H, SSMIN, SSMAX)
DLAS2
Function/Subroutine Documentation
subroutine dlas2 (double precisionF, double precisionG, double precisionH, double precisionSSMIN, double precisionSSMAX)
DLAS2
Purpose:
DLAS2 computes the singular values of the 2-by-2 matrix
[ F G ]
[ 0 H ].
On return, SSMIN is the smaller singular value and SSMAX is the
larger singular value.
Parameters:
F
F is DOUBLE PRECISION
The (1,1) element of the 2-by-2 matrix.
G
G is DOUBLE PRECISION
The (1,2) element of the 2-by-2 matrix.
H
H is DOUBLE PRECISION
The (2,2) element of the 2-by-2 matrix.
SSMIN
SSMIN is DOUBLE PRECISION
The smaller singular value.
SSMAX
SSMAX is DOUBLE PRECISION
The larger singular value.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Further Details:
Barring over/underflow, all output quantities are correct to within
a few units in the last place (ulps), even in the absence of a guard
digit in addition/subtraction.
In IEEE arithmetic, the code works correctly if one matrix element is
infinite.
Overflow will not occur unless the largest singular value itself
overflows, or is within a few ulps of overflow. (On machines with
partial overflow, like the Cray, overflow may occur if the largest
singular value is within a factor of 2 of overflow.)
Underflow is harmless if underflow is gradual. Otherwise, results
may correspond to a matrix modified by perturbations of size near
the underflow threshold.
Definition at line 108 of file dlas2.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.1 Sun May 26 2013 dlas2.f(3)