Community Profile

# Nicolas Douillet

### PhD, INRIA and CNRS alumni

Last seen: 26 giorni fa Attivo dal 2017

Interested in computational geometry, image processing, 3D reconstruction, geometry, mesh processing, mesh generation, number theory, fractals.

Programming Languages:
MATLAB
Spoken Languages:
English, French

All

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PI3MFT
Printable Iterative 3D Meshed Fractal Toolbox

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Any rotation (3D, 2D)
Function to rotate a -array of- vector(s) around any given -shifted- axis, in 2D or 3D space.

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Circular meshes
Sphere and torus circular meshes

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Construct an index vector from two input vectors in vectorized fashion
Create an index vector defined by two input vectors, one defining the beginnings of one or more index ranges, and the other defi...

circa 2 mesi fa

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Fill a zeros matrix
The aim is to fill an array of all zeros given a numerical value and the index of row and columns for this value. 3 Inputs: ...

circa 2 mesi fa

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"Low : High - Low : High - Turn around " -- Create a subindices vector
Let two vectors *lo* and *hi* be given. The job is to create a index vector like so idx = [lo(1):hi(1) lo(2):hi(2) ...]...

circa 2 mesi fa

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Matrix indexing with two vectors of indices
Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)).

circa 2 mesi fa

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Sum My Indices
Given inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices. Example input...

circa 2 mesi fa

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Getting the indices from a matrix
Inspired by Problem 645. Getting the indices from a matrix. Given a matrix A (or a vector), return the indices (always in row...

circa 2 mesi fa

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First non-zero element in each column
For a given matrix, calculate the index of the first non-zero element in each column. Assuming a column with all elements zero i...

circa 2 mesi fa

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Replicate elements in vectors
Replicate each element of a row vector (with NaN) a constant number of times. Examples n=2, A=[1 2 3] -> [1 1 2 2 3 3] ...

2 mesi fa

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Set the array elements whose value is 13 to 0
Input A either an array or a vector (which can be empty) Output B will be the same size as A . All elements of A equal to 13...

2 mesi fa

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Getting logical indexes
This is a basic MATLAB operation. It is for instructional purposes. --- Logical indexing works like this. thresh = 4...

2 mesi fa

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Isprime optimus [FAST]
Primality test using isprime Matlab(r) stock function, but ~60% faster. Based on Nicolas Douillet 'Christmas eve prime squares e...

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alGolbach
Algorithm to compute and list every Goldbach couples of prime numbers which sum equals the given -even- input

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Prime numbers spirals
Functions to display prime numbers spiral and prime squares spiral. Also check primes sum and prime squares spiral length.

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Quickest way for alternate indexing a vector
Thank you all for your interest and answers :-) I am going to test them, pick the best in my case, and then choose for the co...

2 mesi fa | 0

Domanda

Quickest way for alternate indexing a vector
Hey, I am looking for the quickest way to create a vector like this : u = [5 7 11 13 17 19 23 25 ...

2 mesi fa | 5 risposte | 0

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Mesh generation toolbox
Some useful tools for mesh generation

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mesh processing toolbox
Some useful tools for mesh processing

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Sample triangle (2D, 3D, ND)
Function to generate a triangular sampling grid of a given triangle

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Platonic solids
Function to compute and display the five platonic solids.

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Projective geometry demo
A "pedagogic" demo of projective geometry showing some mathematical objects projections

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Mesh ovoid
Function to compute, display, and save a meshed ovoid

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Apparent distance conservation in Matlab plot window while rotating 3D objects
Ok I realized I have to be even clearer. I am going to eplore the camera toolbar possibilities -which I didn't really know unti...

7 mesi fa | 0

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Function to compute and display the apollonian gasket of any 3D triangle or 3D regular polygon

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Lines intersection (2D, 3D) [FAST]
A function to compute the intersection point between two lines of the space (3D or 2D)

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Triangle incircle (2D, 3D) [FAST]
Computes and display the incircle coordinates, the centre and the radius of one given 2D or 3D triangle

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chat with HAL9000 !
chat with HAL9000 and try to survive it ! ^_^