I have a 3 column csv file with ~13 million rows and I would like to generate a correlation matrix.
Let us first have some rough estimations about sizes:
How many rows/columns will this matrix have? Will there be empty matrix elements? The background is: there are some limitations which may or may not affect the solution: Unix files have maximum line lengths because text processing utilities like "sed", "awk", etc. can't handle longer ones (see MAXLINE in sys/limits.h. Shell arrays cannot have more than 1024 elements.
Then some questions: How to deal with multiple entries with the same indexes - add together, generate error, other?
My take would be to first put the lines in "normal form": the lines are of the form
As all keys are interchangeable, so that the following two entries would in effect be the same
and the matrix you are constructing is symetrical along the main diagonal the first step should be to sort the keys within the lines by some criteria, so that the first key in the line is consistently "lower or equal" or "higher or equal" than the second key in the line.
Than a simple sort over the first two fields will reduce the problem to a simple sort-of group-change: all lines with a given keyA will represent one row AND - because the matrix is symetrical - also one column.
Hi guys
I have an input file with multiple columns and and rows.
Is it possible to calculate correlation of certain value of certain No (For example x of S1 = 112) with all other values (for example start with x 112 corr a 3 of S1 = x-a 0.2 )
INPUT
*******
No S1 S2 S3 S4 Sn
a 3 ... (2 Replies)
Hi everyone,
i am new to perl programming, i have a problem in extracting single column from csv file. the column is the 20th column,
please help me..
at present i use this code
#!C:/perl/bin
use warnings;
use strict;
my $file1 = $ARGV;
open FILE1, "<$file1"
or die "Can't... (13 Replies)
Howdy,
I need to convert an association data matrix, currently in a two-column format, into a matrix with numbers indicating the number of associations. I've been looking around for AWK code in the list, but could not find anything. Here's an example of what I want to perform:
original... (10 Replies)
Hi everyone
I am very new at awk but think that that might be the best strategy for this. I have a matrix very similar to a correlation matrix and in practical terms I need to convert it into a list containing the values from the matrix (one value per line) with the first field of the line (row... (5 Replies)
Hello,
am I new to awk, and I am tryint to:
INPUT FILE:
"73423555","73423556","73423557","73423558","73423559"
OUTPUT FILE:
73423555
73423556
73423557
73423558
73423559
My useless code so far:
#!/bin/awk -F ','
BEGIN
{
i=0;
} (8 Replies)
hi, someone to know how can i read a specific column of csv file and search the value in other csv columns if exist the value in the second csv copy entire row with all field in a new csv file. i suppose that its possible using awk but i m not expertise thanks in advance (8 Replies)
Hi
I want to grep a column 6 & column 7 from a CSV Format file & then i have to find the difference between these columns as these both columns contains date & time in 7/7/2012 9:20 this format . So kindly help me out ASAP.
But please kindly dis xls has to be converted in csv format as may... (5 Replies)
Dear all,
I'm new in perl scripting and I'm trying to creating a matrix from a 3 column file sorting data in a particular manner. In the final matrix I need to have the first column "IDs" on the header of the columns and the second column values on the header of each row. And the value fo the... (2 Replies)
Hi, Is it possible to transpose the matrix like this using awk ? Many thanks in advance
Input
abc Name_1 0
abc Name_2 1
abc Name_3 2
abc Name_4 0.4
def Name_1 0
def Name_2 9
def Name_3 78
def Name_4 1
Output
abc def
Name_1 0 ... (4 Replies)
Example:
I have files in below format
file 1:
zxc,133,joe@example.com
cst,222,xyz@example1.com
File 2 Contains:
hxd
hcd
jws
zxc
cst
File 1 has 50000 lines and file 2 has around 30000 lines :
Expected Output has to be :
hxd
hcd
jws (5 Replies)
Discussion started by: TestPractice
5 Replies
LEARN ABOUT CENTOS
clabrd
clabrd.f(3) LAPACK clabrd.f(3)NAME
clabrd.f -
SYNOPSIS
Functions/Subroutines
subroutine clabrd (M, N, NB, A, LDA, D, E, TAUQ, TAUP, X, LDX, Y, LDY)
CLABRD reduces the first nb rows and columns of a general matrix to a bidiagonal form.
Function/Subroutine Documentation
subroutine clabrd (integerM, integerN, integerNB, complex, dimension( lda, * )A, integerLDA, real, dimension( * )D, real, dimension( * )E,
complex, dimension( * )TAUQ, complex, dimension( * )TAUP, complex, dimension( ldx, * )X, integerLDX, complex, dimension( ldy, * )Y,
integerLDY)
CLABRD reduces the first nb rows and columns of a general matrix to a bidiagonal form.
Purpose:
CLABRD reduces the first NB rows and columns of a complex general
m by n matrix A to upper or lower real bidiagonal form by a unitary
transformation Q**H * A * P, and returns the matrices X and Y which
are needed to apply the transformation to the unreduced part of A.
If m >= n, A is reduced to upper bidiagonal form; if m < n, to lower
bidiagonal form.
This is an auxiliary routine called by CGEBRD
Parameters:
M
M is INTEGER
The number of rows in the matrix A.
N
N is INTEGER
The number of columns in the matrix A.
NB
NB is INTEGER
The number of leading rows and columns of A to be reduced.
A
A is COMPLEX array, dimension (LDA,N)
On entry, the m by n general matrix to be reduced.
On exit, the first NB rows and columns of the matrix are
overwritten; the rest of the array is unchanged.
If m >= n, elements on and below the diagonal in the first NB
columns, with the array TAUQ, represent the unitary
matrix Q as a product of elementary reflectors; and
elements above the diagonal in the first NB rows, with the
array TAUP, represent the unitary matrix P as a product
of elementary reflectors.
If m < n, elements below the diagonal in the first NB
columns, with the array TAUQ, represent the unitary
matrix Q as a product of elementary reflectors, and
elements on and above the diagonal in the first NB rows,
with the array TAUP, represent the unitary matrix P as
a product of elementary reflectors.
See Further Details.
LDA
LDA is INTEGER
The leading dimension of the array A. LDA >= max(1,M).
D
D is REAL array, dimension (NB)
The diagonal elements of the first NB rows and columns of
the reduced matrix. D(i) = A(i,i).
E
E is REAL array, dimension (NB)
The off-diagonal elements of the first NB rows and columns of
the reduced matrix.
TAUQ
TAUQ is COMPLEX array dimension (NB)
The scalar factors of the elementary reflectors which
represent the unitary matrix Q. See Further Details.
TAUP
TAUP is COMPLEX array, dimension (NB)
The scalar factors of the elementary reflectors which
represent the unitary matrix P. See Further Details.
X
X is COMPLEX array, dimension (LDX,NB)
The m-by-nb matrix X required to update the unreduced part
of A.
LDX
LDX is INTEGER
The leading dimension of the array X. LDX >= max(1,M).
Y
Y is COMPLEX array, dimension (LDY,NB)
The n-by-nb matrix Y required to update the unreduced part
of A.
LDY
LDY is INTEGER
The leading dimension of the array Y. LDY >= max(1,N).
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Further Details:
The matrices Q and P are represented as products of elementary
reflectors:
Q = H(1)H(2) . . . H(nb) and P = G(1)G(2) . . . G(nb)
Each H(i) and G(i) has the form:
H(i) = I - tauq * v * v**H and G(i) = I - taup * u * u**H
where tauq and taup are complex scalars, and v and u are complex
vectors.
If m >= n, v(1:i-1) = 0, v(i) = 1, and v(i:m) is stored on exit in
A(i:m,i); u(1:i) = 0, u(i+1) = 1, and u(i+1:n) is stored on exit in
A(i,i+1:n); tauq is stored in TAUQ(i) and taup in TAUP(i).
If m < n, v(1:i) = 0, v(i+1) = 1, and v(i+1:m) is stored on exit in
A(i+2:m,i); u(1:i-1) = 0, u(i) = 1, and u(i:n) is stored on exit in
A(i,i+1:n); tauq is stored in TAUQ(i) and taup in TAUP(i).
The elements of the vectors v and u together form the m-by-nb matrix
V and the nb-by-n matrix U**H which are needed, with X and Y, to apply
the transformation to the unreduced part of the matrix, using a block
update of the form: A := A - V*Y**H - X*U**H.
The contents of A on exit are illustrated by the following examples
with nb = 2:
m = 6 and n = 5 (m > n): m = 5 and n = 6 (m < n):
( 1 1 u1 u1 u1 ) ( 1 u1 u1 u1 u1 u1 )
( v1 1 1 u2 u2 ) ( 1 1 u2 u2 u2 u2 )
( v1 v2 a a a ) ( v1 1 a a a a )
( v1 v2 a a a ) ( v1 v2 a a a a )
( v1 v2 a a a ) ( v1 v2 a a a a )
( v1 v2 a a a )
where a denotes an element of the original matrix which is unchanged,
vi denotes an element of the vector defining H(i), and ui an element
of the vector defining G(i).
Definition at line 212 of file clabrd.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 clabrd.f(3)