Don't use this tag. If you have questions about cartesian products (e.g. SQL, Spark, Datatables, heterogeneous tuples), use `cartesian-product` tag. If you have questions about planar geometry / 3D-graphics, use `cartesian-coordinates` tag.
Questions tagged [cartesian]
245 questions
1
vote
2 answers
Transform a java object tree into a 2 dimension table
I'm faced to the following problem. I have a tree of java objects for which I have to export each field value into a CSV file. The result of the exportation must be similar to what we have in SQL left outer join (called cartesian product).
Class…
cmoulliard
- 11
- 1
1
vote
1 answer
Convert Latitude / Longitude to Cartesian on Winkel Tripel projection
I have a Winkel Tripel map that I need to place markers over. Im given the position of the markers in Latitude/ Longitude. So I need a way to convert it to X,Y.
I found some code (below), but when I tried it out, the plot of a 45º diagonal line has…
Adam Meyer
- 1,505
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1
vote
1 answer
Does it cause a Cartesian join if you include a table nothing is selected from?
Would this be a Cartesian join:
select
dog_t.type
dog_t.breed
date_t.date
from
dog_t,
cat_t,
date_t
where
dog_t.date_key=date_t.date_key
Would including the cat_t table cause a Cartesian join... because it isn't joined to anything?
tylercomp
- 871
- 3
- 13
- 25
1
vote
3 answers
How to avoid cartesian product on querying?
I'm building a web app of classified ads (it's my first professional PHP app). I have a table with the Ads and other with the images for each Ad. Each ad can have up to 4 images. It all worked fine while I was adding only one image per ad. Now, when…
Mick Murillo
- 45
- 5
1
vote
2 answers
Creating particles to follow circular paths in HTML5 canvas
Ok, so I am learning HTML5 and I wanted to update my portfolio to have a moving black hole instead of a static picture of one. I could have just taken the picture and rotated it in the canvas, but I thought it would be better if I did it all without…
Alan DeLonga
- 454
- 1
- 10
- 27
1
vote
0 answers
Minimal set of n-tuples covering a given set of n-tuples
Input: a set of M ordered tuples of n elements, where each element is a set, i.e.:
(A1, A2, ..., An), where each Ai is a set
Problem: combine these n-tuples together to create the minimal set of n-tuples.
2 n-tuples can be combined together iff they…
tainic
- 21
- 3
1
vote
3 answers
VB.NET Cartesian Coordinate System
I'd like to make a Cartesian Coordinate System in a Windows form and be able to plot (x,y) coordinates in it.
How do i do this? I already did my research but unfortunately i only land on "charts" and not the Cartesian plane.
Any links regarding my…
Mark A.
- 243
- 6
- 21
1
vote
2 answers
Better method of finding every possible combination of the partitioned sets
I need to find every possible combination of N sets of X length with no duplicates and in a particular order, e.g.
input: [["A"], ["B"], ["C"]]
output: [["A","B","C"],["A","B"],["A","C"],["B","C"],["A"],["B"],["C"]]
Rules:
The number or size of…
Phil Moorhouse
- 850
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- 22
0
votes
1 answer
How to find the coordinate of final point in a parabolic motion through 3 points where 2 points are known?
Suppose an object travels in a parabola in 2D coordinate system from P to Q and then Q to R where the 2D coordinates of P and Q are known and we do not know the parabola through these 3 points.
The object goes from P to Q in 1 millisecond and Q to R…
user991511
0
votes
1 answer
How to use MPI Cartesian Topology Correctly
To start off, I needed to calculate a number of sums and then find the minimum of those sums, this was done as so, using mpi:
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
MPI_Comm_rank(MPI_COMM_WORLD, &myid);
…
Bob gilong
- 215
- 2
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- 17
0
votes
1 answer
Why does my JavaScript function accept three arrays, but not an array containing three arrays?
function product() {
return Array.prototype.reduce.call(arguments, function(as, bs) {
return [a.concat(b) for each (a in as) for each (b in bs)]
},…
j.b
- 151
- 1
- 7
- 17
0
votes
1 answer
Cartesian product of dynamic array using linq c# throw outofmemory exception
I have followed this
http://blogs.msdn.com/b/ericlippert/archive/2010/06/28/computing-a-cartesian-product-with-linq.aspx
and created a dynamic linq query to compute cartesian product.
I have 10 array item, each has 100 item in it.…
Esen
- 973
- 1
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0
votes
1 answer
how to scale gps coordinate by given direction and length
I'd like to scale GPS coordinate by given direction and length.
E.g. I have two points A,B. I know their GPS position (also in cartesian format) and I'd like to change the length of line AB by 1.5 where point A should be intact and B should move to…
luccio
- 485
- 1
- 6
- 24
0
votes
4 answers
MySQL View Problems
I have the following tables, users which is self explanatory and answers which contains a list of responses on a given date for a specific user.
users
-----
ID FIRST_NAME LAST_NAME
1 Joe Bloggs
2 Fred Sexy
3 Jo …
user151419
0
votes
0 answers
How to derive vector from horizontal coordinates
I'm trying to modify a model that starting from horizontal coordinates (https://en.wikipedia.org/wiki/Horizontal_coordinate_system) gives us the cartesian directions (or the unit vector).
Having as an input:
azimuth (az) and elevation (el) of a…
Guido de
- 1