10 More Discussions You Might Find Interesting
1. Homework & Coursework Questions
How can I produce this kind of output?
Enter a number: 3
MULTIPLICATION TABLE:
0 1 2 3
1 1 2 3
2 2 4 6
3 3 6 9
When you enter a number, it should show you the corresponding multiplication table. Plus we need to use for loops that I do not actually know. Thanks in advance! Here is my... (2 Replies)
Discussion started by: larkha
2 Replies
2. UNIX for Dummies Questions & Answers
Hi there! I have two files like below
File1(with a header, ~1000 rows, ~50 columns)
ID1 ID2 ID3 ID4 ID5 MI1_A MI1_H MI2_A MI2_H
0 1 0 0 0 1 0 2 1
0 2 0 0 0 2 1 0 1
File2 (without a header, ~50 rows)
MI1 A 0.4 3.1
MI2 B -0.2 0.1
Output
ID2 M1_A M2_A
1 1*0.4 2*-0.2
2 2*0.4 0*-0.2
... (22 Replies)
Discussion started by: Akang
22 Replies
3. Programming
Hi all, newbie here.
Does anyone know if it is possible to use GCC or Clang to multiply
two unsigned numbers and have it use for intel instructions, the mull instruction or an imul. I can't figure how to word this to accomplish this task:
(int)(((unsigned long long)result * (unsigned)2290649225)... (4 Replies)
Discussion started by: pheonix
4 Replies
4. Ubuntu
Hi all,
Is there a way to convert full data matrix to linearised left data matrix?
e.g full data matrix
Bh1 Bh2 Bh3 Bh4 Bh5 Bh6 Bh7
Bh1 0 0.241058 0.236129 0.244397 0.237479 0.240767 0.245245
Bh2 0.241058 0 0.240594 0.241931 0.241975 ... (8 Replies)
Discussion started by: evoll
8 Replies
5. UNIX for Dummies Questions & Answers
Hi,
i have file1 which looks like:
x1 y1 z1
x2 y2 z2
...(and so on)
and file2 which looks like:
a11 a12 a13
a21 a22 a23
a31 a32 a33
and i want to replace file1 with the following values:
x1' y1' z1'
x2' y2' z2'
...(and so on) (2 Replies)
Discussion started by: ezitoc
2 Replies
6. UNIX for Dummies Questions & Answers
Hi,
I would like to carry out a multiplication in a for loop but some how I get always zero. The result of the multiplication must be assigned to the variable x.
Here is teh code
for (( i=1;i<=15;i++)); do
x=$( printf "%s\n " 'scale = 10; i*5.0*335.0*3.0/1000.0' | bc)
echo $x $i... (5 Replies)
Discussion started by: f_o_555
5 Replies
7. Shell Programming and Scripting
Hello, all!
I am struggling with a short script to read a diagonal matrix for later retrieval.
1.000 0.234 0.435 0.123 0.012 0.102 0.325 0.412 0.087 0.098
1.000 0.111 0.412 0.115 0.058 0.091 0.190 0.045 0.058
1.000 0.205 0.542 0.335 0.054 0.117 0.203 0.125
1.000 0.587 0.159 0.357... (11 Replies)
Discussion started by: yifangt
11 Replies
8. UNIX for Dummies Questions & Answers
Hi,
I am writing a script in Bourne shell
#!/bin/sh
used=`quota -v | tail -1 | awk '{print $2}'`
total=`quota -v | tail -1 | awk '{print $3}'`
echo "$used"
echo "$total"
perc=`expr ${used} / ${total} * 100 | bc`
echo "$perc"
I want to get a percentage of quota used to total limit
I... (5 Replies)
Discussion started by: desai.rishabh
5 Replies
9. Shell Programming and Scripting
Suppose i have a file A
1*2*3*4
2*4*4*22
and second file B
2*3*4*5
4*4*6*7
By multiplying file A by file B that is file A by first column in file B respectively
output shud be
2*6*12*20
8*16*24*154
my code is
=$1
next
}
{for (f=1;f<=NF;f++) (2 Replies)
Discussion started by: cdfd123
2 Replies
10. Linux
Hello there,
how do i multiply a fraction and a whole number? Example 20% of 50,000.
I had gotten 0.2 using the following:
chk=echo 20 100 | awk `{print $1/$2}`
echo $chk
$chk \* 50000 displays the error: non-numeric expression. (1 Reply)
Discussion started by: alby
1 Replies
Matrix(3) User Contributed Perl Documentation Matrix(3)
NAME
PDL::Matrix -- a derived matrix class that implements column-major constructors and methods
VERSION
This document refers to version PDL::Matrix 0.01 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. matrices can be typed in using traditional matrix convention.
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 con-
vention, 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 eigenvalue or matrix inversion 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.
FUNCTIONS
mpdl, PDL::Matrix::pdl
constructs an object of class PDL::Matrix which is a piddle child class, where the first index refers to the first column of the two-dimen-
sional piddle.
$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]
]
PDL::Matrix::slice, PDL::Matrix::dice
same as slice, dice for normal piddles, but reflecting the matrix convention by swapping the first two arguments.
print sequence(3,2)->slice("1:2,(0)") # piddle
[1 2]
print msequence(3,2)->slice("1:2,(0)") # PDL::Matrix
[2 4]
PDL::Matrix::at
same as at for piddles, but reflecting the matrix convention by swapping the first two arguments
If only one scalar argument is used, we assume the object to be a vector and look only at the first column.
PDL::Matrix::set
set a particular value in a PDL::Matrix object. Note that this has to be called as an object method rather than a function
print msequence(3,3)->set(2,0,-1) # ok with PDL::Matrix convention [
[ 0 1 2]
[ 3 4 5]
[-1 7 8] ]
print set msequence(3,3), 2,0,-1 # does not conform with PDL::Matrix convention [
[ 0 1 -1]
[ 3 4 5]
[ 6 7 8] ]
PDL::Matrix::reshape
same as reshape for piddles, but reflecting the matrix convention by swapping the first two arguments
mdims
returns the dimensions of the PDL::Matrix object in matrix convention
"dims" is NOT overloaded by PDL::Matrix to make sure that methods like PDL::transpose still work. So use "mdims" to get the dims in the
PDL::Matrix notation.
print msequence(3,2)->mdims
3 2
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)
vcrossp, PDL::Matrix::crossp
similar to PDL::crossp, however reflecting PDL::Matrix notations
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 rede-
fined. We might have missed some functions/methods. Internal consistency of our approach needs yet to be established.
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 v5.8.0 2001-12-03 Matrix(3)