cross-product Questions
4
Solved
I would like to compute the cross product of two vectors in Fortran 90. For example, in words, the cross product of (1, 2, 3) and (4, 5, 6) turns out to be (-3, 6, -3) in Cartesian coordinates. I w...
Urgency asked 28/6, 2011 at 18:58
6
Solved
What am I doing wrong?
> crossprod(1:3,4:6)
[,1]
[1,] 32
According to this website:http://onlinemschool.com/math/assistance/vector/multiply1/
It should give:
{-3; 6; -3}
See also What is...
Greasewood asked 22/4, 2016 at 15:51
8
Solved
I want to have a binary operator cross (cross-product/cartesian product) that operates with traversables in Scala:
val x = Seq(1, 2)
val y = List('hello', 'world', 'bye')
val z = x cross y # i can...
Microampere asked 6/2, 2013 at 22:35
1
I have a list with multiply identities and each identity consists of multiple images. When i am retrieving positive images from json list it works fine. After that I am mixing this positive list wi...
Fussell asked 8/1, 2021 at 12:41
6
Solved
I want to do permutation in Perl. For example I have three arrays: ["big", "tiny", "small"] and then I have ["red", "yellow", "green"] and also ["apple", "pear", "banana"].
How do I get:
["big", ...
Grayback asked 16/3, 2010 at 18:34
3
Solved
I'm mostly convinced that there is an answer to this problem, but for the life of me can't figure out how to do it.
Let's say I have three sets:
A = [ 'foo', 'bar', 'baz', 'bah' ]
B = [ 'wibble',...
Stela asked 30/3, 2012 at 14:27
2
Solved
As the title says I want to calculate the surface normals of a given depth image by using the cross product of neighboring pixels. I would like to use Opencv for that and avoid using PCL however, I...
Artie asked 6/1, 2016 at 22:30
0
In various attempts to reduce the computing time of an algorithm I have been coding in the last few days, I wanted to test the effective improvement given by crossprod on the %*%. I surprisingly no...
Fabri asked 6/11, 2019 at 0:19
3
Solved
What is the simplest and most efficient ways in numpy to generate two orthonormal vectors a and b such that the cross product of the two vectors equals another unit vector k, which is already known...
Ketonuria asked 11/11, 2015 at 19:45
2
Solved
Based on my related question linked below (see @Aleh solution): I am looking to calculate only unique products between columns in a matrix for a given power.
E.g., for N=5,M=3, p=2, we get the pro...
Gossoon asked 28/3, 2018 at 15:47
6
I have two tables that I would like to join but I am getting an error from MySQL
Table: books
bookTagNum ShelfTagNum
book1 1
book2 2
book3 2
Table: shelf
shelfNum shelfTagNum
1 shelf1
2 shelf2
...
Cocci asked 6/11, 2008 at 2:56
2
Solved
I'm trying to compute the cross-products of many 3x1 vector pairs as fast as possible. This
n = 10000
a = np.random.rand(n, 3)
b = np.random.rand(n, 3)
numpy.cross(a, b)
gives the correct answ...
Missus asked 23/9, 2016 at 13:53
2
Solved
I am trying to produce string variants by applying substitutions optionally.
For example, one substitution scheme is removing any sequence of blank characters.
Rather than replacing all occurrence...
Addict asked 6/1, 2016 at 16:28
1
Solved
I have two vectors. I would like a "cross product"-esque function that will take each value from the first vector and raise it to the exponent of each value in a second vector, returning a matrix. ...
Kipp asked 16/9, 2015 at 15:6
1
Solved
Is there a ready function or method in Eigen for the Hat operator? That is the operator, taking a vector as input and returning a matrix, which mimics a cross product with that vector. I know, that...
Ruffina asked 1/10, 2014 at 8:2
1
Solved
I have two data frames, each with two columns. They could be matrices with same dimensions if that helps in the calculations.
What I want to do is the sum product of these data frames of the resp...
Jewelfish asked 9/4, 2015 at 23:8
1
Solved
I'm trying to construct multiple cross products of traversables of different (but each homogeneous) types. The desired return type is a traversable of a tuple with the type matching the types in th...
Palais asked 25/4, 2013 at 16:0
1
Solved
What is the best way to take the cross product of each corresponding row between two arrays? For example:
a = 20x3 array
b = 20x3 array
c = 20x3 array = some_cross_function(a, b) where:
c[0] = np....
Girandole asked 25/3, 2013 at 22:56
2
Solved
Please help me to solve this problem:
I have a list of lists
[[1,2],[3,4]]
How do I get:
[1,3]
[1,4]
[2,3]
[2,4]
Or if I have a list of lists
[[1,2],[3,4],[6,7]]
How do I ...
Argil asked 25/1, 2012 at 0:21
2
Solved
I am trying to use R to perform an operation (ideally with similarly displayed output) such as
> x<-1:6
> y<-1:6
> x%o%y
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 2 3 4 5 6
[2,] 2 4 6 8...
Sheelagh asked 13/7, 2011 at 19:33
3
Solved
Does the method for computing the cross-product change for left handed coordinates?
Ringlet asked 27/1, 2011 at 18:39
2
Solved
I guess it's an academic question, but the second result does not make sense to me. Shouldn't it be as thoroughly empty as the first? What is the rationale for this behavior?
from itertools import...
Dwarfish asked 1/7, 2010 at 0:4
5
Solved
I have the following piece of pseudo-C/Java/C# code:
int a[]= { 30, 20 };
int b[] = { 40, 50 };
int c[] = {12, 12};
How do I compute the cross-product ABxAC?
Mares asked 28/3, 2010 at 13:17
1
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