06-24-2016
Nikhil,
As I have repeatedly stated. We don't need to see all of your data. (Even if we did see all of your data, we apparently have no idea what the results are supposed to be.) There is nothing for me to check. The code I supplied is working exactly as I intended it to work based on your varying descriptions of the results you want. If you won't describe what needs to be done differently (instead of just repeating that my code is not working), I have nothing to check and I cannot help you.
Unless you post precise directions that we can follow that accurately describe what steps need to be taken to get the results you want, there is no possible way for any of us to help you. I could make some more wild guesses that would change the results that you say are wrong, but doing so would change results in previous posts that you seem to believe are correct as they now stand.
PLEASE post precise directions that we can follow to accurately determine what results you want to be produced based on the contents of input fields 1 and 2! If you haven't done that in the next 72 hours, this thread will be closed. (I am allowing 72 hours instead of 24 since we are rapidly approaching a weekend.)
Last edited by Don Cragun; 06-24-2016 at 02:05 PM..
Reason: Update time when thread will be closed.
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LEARN ABOUT DEBIAN
pdl::matrix
Matrix(3pm) User Contributed Perl Documentation Matrix(3pm)
NAME
PDL::Matrix -- a convenience matrix class for column-major access
VERSION
This document refers to version PDL::Matrix 0.5 of PDL::Matrix
SYNOPSIS
use PDL::Matrix;
$m = mpdl [[1,2,3],[4,5,6]];
$m = PDL::Matrix->pdl([[1,2,3],[4,5,6]]);
$m = msequence(4,3);
@dimsa = $a->mdims; # 'dims' is not overloaded
$v = vpdl [0,1,2,3]
$v = vzeroes(4);
DESCRIPTION
Overview
This package tries to help people who want to use PDL for 2D matrix computation with lots of indexing involved. It provides a PDL subclass
so one- and two-dimensional piddles that are used as vectors resp and matrices can be typed in using traditional matrix convention.
If you want to know more about matrix operation support in PDL, you want to read PDL::MatrixOps or PDL::Slatec.
The original pdl class refers to the first index as the first row, the second index as the first column of a matrix. Consider
print $B = sequence(3,2)
[
[0 1 2]
[3 4 5]
]
which gives a 2x3 matrix in terms of the matrix convention, but the constructor used (3,2). This might get more confusing when using slices
like sequence(3,2)->slice("1:2,(0)") : with traditional matrix convention one would expect [2 4] instead of [1 2].
This subclass PDL::Matrix overloads the constructors and indexing functions of pdls so that they are compatible with the usual matrix
convention, where the first dimension refers to the row of a matrix. So now, the above example would be written as
print $B = PDL::Matrix->sequence(3,2) # or $B = msequence(3,2)
[
[0 1]
[2 3]
[4 5]
]
Routines like eigens or inv can be used without any changes.
Furthermore one can construct and use vectors as n x 1 matrices without mentioning the second index '1'.
Implementation
"PDL::Matrix" works by overloading a number of PDL constructors and methods such that first and second args (corresponding to first and
second dims of corresponding matrices) are effectively swapped. It is not yet clear if PDL::Matrix achieves a consistent column-major
look-and-feel in this way.
NOTES
As of version 0.5 (rewrite by CED) the matrices are stored in the usual way, just constructed and stringified differently. That way
indexing and everything else works the way you think it should.
FUNCTIONS
mpdl, PDL::Matrix::pdl
constructs an object of class PDL::Matrix which is a piddle child class.
$m = mpdl [[1,2,3],[4,5,6]];
$m = PDL::Matrix->pdl([[1,2,3],[4,5,6]]);
mzeroes, mones, msequence
constructs a PDL::Matrix object similar to the piddle constructors zeroes, ones, sequence.
vpdl
constructs an object of class PDL::Matrix which is of matrix dimensions (n x 1)
print $v = vpdl [0,1];
[
[0]
[1]
]
vzeroes, vones, vsequence
constructs a PDL::Matrix object with matrix dimensions (n x 1), therefore only the first scalar argument is used.
print $v = vsequence(2);
[
[0]
[1]
]
kroneckerproduct
returns kroneckerproduct of two matrices. This is not efficiently implemented.
det_general
returns a generalized determinant of a matrix. If the matrix is not regular, one can specify the rank of the matrix and the corresponding
subdeterminant is returned. This is implemented using the "eigens" function.
trace
returns the trace of a matrix (sum of diagonals)
BUGS AND PROBLEMS
Because we change the way piddles are constructed, not all pdl operators may be applied to piddle-matrices. The inner product is not
redefined. We might have missed some functions/methods. Internal consistency of our approach needs yet to be established.
Because PDL::Matrix changes the way slicing behaves, it breaks many operators, notably those in MatrixOps.
TODO
check all PDL functions, benchmarks, optimization, lots of other things ...
AUTHOR(S)
Stephan Heuel (stephan@heuel.org), Christian Soeller (c.soeller@auckland.ac.nz).
COPYRIGHT
All rights reserved. There is no warranty. You are allowed to redistribute this software / documentation under certain conditions. For
details, see the file COPYING in the PDL distribution. If this file is separated from the PDL distribution, the copyright notice should be
included in the file.
perl v5.14.2 2011-03-30 Matrix(3pm)