hilbert-curve | Java utilities for transforming distance along N | Math library
kandi X-RAY | hilbert-curve Summary
kandi X-RAY | hilbert-curve Summary
Java utilities for transforming distance along N-dimensional Hilbert Curve to a point and back. Also supports range splitting queries on the Hilbert Curve.
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- Renders bits to a file
- Returns the transpose of the given index
- Converts a transposed index to a real point
- Creates a buffered image of bits
- Visit all cells in the cell
- Returns the minimum of two sets
- Returns the maximum and maximum values of two arrays
- Add one element to an array
- Returns the index of the given point
- Returns the big - endian index
- Computes the transposed index of a point
- Returns a string representation of this list
- Returns a List containing all ranges
- Compares two nodes
- Gets the low value
- Iterates over the ranges
- Returns the previous node
- Returns a string representation of the box
- Prints the output
- Return a new stream of ranges
- Compares this range to another
hilbert-curve Key Features
hilbert-curve Examples and Code Snippets
Lines of Code : 27License : Permissive (Apache-2.0)
CopySmallHilbertCurve c = HilbertCurve.small().bits(5).dimensions(2);
long[] point1 = new long[] {3, 3};
long[] point2 = new long[] {8, 10};
// return just one range
int maxRanges = 1;
Ranges ranges = c.query(point1, point2, maxRanges);
ranges.stream().f 20 1.00
19 1.05
18 1.11
17 1.16
16 1.22
15 1.49
14 1.75
13 2.01
12 2.28
11 2.54
10 2.80
09 3.49
08 4.17
07 4.86
06 5.54
05 7.70
04 11.54
03 17.07
02 56.29
01 370.03
mvn clean install -P benchmark
Benchmark Mode Cnt Score Error Units
Benchmarks.pointSmallTimes512 thrpt 10 7053.853 ± 195.516 ops/s
Benchmarks.pointSmallTimes512LowAllocation Community Discussions
Trending Discussions on hilbert-curve
QUESTION
I'm trying to make a Hilbert Curve that takes as little time as possible to complete. Here is the code so far (adapted from Hilbert curve using turtle graphics and recursion)
...ANSWER
Answered 2021-Nov-18 at 04:56Short of rethinking the program's entire approach, here's a quick fix that provides noticeable speed up. We'll use tracer() and update() to precisely control the graphics. We don't want to hide any of the drawing (which is possible with tracer()) but rather only draw when there is a line to draw, treating all the turtle's turns as internal logic calculations, displaying only the final heading:
QUESTION
I have been trying to write a function for the Hilbert curve map and inverse map. Fortunately there was another SE post on it, and the accepted answer was highly upvoted, and featured code based on a paper in a peer-reviewed academic journal.
Unfortunately, I played around with the code above and looked at the paper, and I'm not sure how to get this to work. What appears to be broken is that my code drawing the second half of a 2-bit 2-dimensional Hilbert Curve backwards. If you draw out the 2-d coordinates in the last column, you'll see the second half of the curve (position 8 and on) backwards.
I don't think I'm allowed to post the original C code, but the C++ version below is only lightly edited. A few things that are different in my code.
C code is less strict on types, so I had to use
std::bitsetIn addition to the bug mentioned by @PaulChernoch in the aforementioned SE post, the next
forloop segfaults, too.The paper represents one-dimensional coordinates weirdly. They call it the number's "Transpose." I wrote a function that produces a "Transpose" from a regular integer.
Another thing about this algorithm: it doesn't produce a map between unit intervals and unit hypercubes. Rather, it stretches the problem out and maps between intervals and cubes with unit spacing.
...ANSWER
Answered 2021-Jul-19 at 02:29"In addition to the bug mentioned by @PaulChernoch in the above mentioned SE post, the next for loop segfaults, too." Actually it was a bug in my code--I was having a hard time iterating over a container backwards. I started looking at myself after I realized there were other Python packages (e.g. this and this) that use the same underlying C code. Neither of them were complaining about the other for loop.
In short, I changed
QUESTION
I have to calculate the distance on a hilbert-curve from 2D-Coordinates. With the hilbertcurve-package i built my own "hilbert"-function, to do so. The coordinates are stored in a dataframe (col_1 and col_2). As you see, my function works when applied to two values (test).
However it just does not work when applied row wise via apply-function! Why is this? what am I doing wrong here? I need an additional column "hilbert" with the hilbert-distances from the x- and y-coordinate given in columns "col_1" and "col_2".
...ANSWER
Answered 2020-May-21 at 19:33Since you have hilbert(df.col_1, df.col_2) in the apply, that's immediately trying to call your function with the full pd.Serieses for those two columns, triggering that error. What you should be doing is:
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