A spiral is a two- or three-dimensional shape composed of lines which continuously wrap around a center point. The spiral model is an iterative software development methodology, in which each iteration builds upon previous work.
Questions tagged [spiral]
202 questions
3
votes
0 answers
How to get co-ordinate from spiral
Lets say I have a spiral like so
8 1-2
| | |
7 0 3
| |
6-5-4
Which continues to go on to infinity round and round.
In terms of co-ords:
0 at (0, 0),
1 at (0, 1),
2 at (1, 1),
3 at (1, 0),
4 at (1, -1),
5 at (0, -1),
6 at (-1, -1),
7 at (-1, 0),
8…
dangee1705
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3
votes
2 answers
Simulating a logarithmic spiral galaxy in python
I am simulating a logarithmic spiral galaxy using python. Using the parametric equations,
x= a*exp(b*theta)*cos(theta)
and
y= a*exp(b*theta)*sin(theta)
I used numpy.random for getting the random distribution of stars. The sample code is given…
Athul R T
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3
votes
1 answer
Curve fitting with y points on repeated x positions (Galaxy Spiral arms)
I currently have a MATLAB program which takes RGB images of traced spiral arms from galaxies and selects the biggest arm component and plots only that.
I have tried using matlab's built in curve fitting tool with smoothing spline to fit it and I…
Kyaw Swar
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- 4
2
votes
5 answers
Creating outward spiral
I've been thinking about this and I just can't think of a way to fill in a matrix with an outward spiral, so that I can do the following:
Turn this:
1 2 3 4 5 ... n
To
21 22 23 24 25 26
20 07 08 09 10 27
19 06 01 02 11 28
18 05 04 03 12 29
17 16 15…
David Gomes
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2
votes
1 answer
Image Spiral Pixel Search
I'm trying to figure out how to do a pixel (color) search from the center and out, in a spiral shape.. Not like the normal "left to right pixel search".
So far i've made some simple x-y searches. Using standard PIL. But it was to slow. as the result…
b0bz
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2
votes
2 answers
Replicating matrices outwards from a central point
I'm quite new to programming so am looking for some experts to nudge me in the right direction as I complete this exercise.
I have used horzcat and vertcat to manually do this but I'm asking if anyone knows a simpler way.
Matrix 1 is 18x18 and…
Tetra
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2
votes
3 answers
Using spiral rule in command line argument
what is the difference between the below declarations?
char *argv[];
and
char *(argv[]);
I think it is same according to spiral rule.
Rajesh
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2
votes
3 answers
Very interesting program of building pyramid
I have came across this very interesting program of printing numbers in pyramid.
If n = 1 then print the following,
1 2
4 3
if n = 2 then print the following,
1 2 3
8 9 4
7 6 5
if n = 3 then print the following,
1 2 3 4
12 13 14 …
Umesh K
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2
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2 answers
Filling the area between Archimedes spyrals with interpolated colours - Matplotlib
I want to plot various spirals like the ones shown in the Figure (one spiral inner the others). Let's say I have three spirals (S1, S2 and S3) and I want to fill the area between consecutive spirals, i.e. the area between S1 and S2, S2 and S3 and…
Oscar Gabriel Reyes Pupo
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2
votes
1 answer
Generate particles for spiral galaxy in THREE.js
I would like to create a simple spiral galaxy using THREE.Points in THEE.js.
I cannot figure out how to generate spiral arms. Is there any (not too difficult) way to do this?
Here I created this fiddle. There is a flattened sphere but without…
Michal
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2
votes
3 answers
Nested loops for creating a spiral shape pattern in c
I need to make a spiral pattern made of stars '*' using nested for loops. I managed to make outter lines, now I don't know how to repeat smaller swirls in the same place.
What I should have:
*********
*
******* *
* * *
* *** * *
* * *…
dinis4
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2
votes
2 answers
Drawing a logarithmic spiral in three axes in Python
I try to draw a logarithmic spiral in the form of a spring in three axes.
Using the parametric equations:
x=a*exp(b*th)*cos(th)
y=a*exp(b*th)*sin(th)
Using the code:
import matplotlib as mpl
from mpl_toolkits.mplot3d import Axes3D
import numpy as…
Tomasz Przemski
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2
votes
1 answer
Non square spiral matrix not printing correctly
I am having issues with this assignment I have. I am to print a spiral matrix which cannot be square, in other words the user should input the number of rows and columns.
Console.Write("Enter n: ");
int n =…
Novica Josifovski
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2
votes
2 answers
How am I incorrectly implementing this algorithms to sort a list of points in a spiral?
I'm trying to sort a list of points in a consistent spiral.
The algorithms here are simply beyond me; see this jsbin for an example of what I'm doing.
The graph you'll see should be as close to a spiral as possible, and currently isn't, even as…
Carlos Vergara
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2
votes
2 answers
How does one achieve a square spiral like the the Ulam spiral in Netlogo?
I spent the morning trying to find an easy function (x,y) -> n that would number the patches like this
I was not successful. Do any of Y'all have any experience or suggestions?
King-Ink
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