# Nicolas Douillet

### PhD, INRIA and CNRS alumni

Last seen: Today Active since 2017

Followers: 1   Following: 0

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

Programming Languages:
MATLAB
Spoken Languages:
English, French

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Question

Squizzed help display in File Exchange contribution tab
Hi all, I am a contributor to the file exchange, and recently I noticed the help I provide with my file ('doc.m' compiled via...

23 hours ago | 0 answers | 0

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Submitted

mesh processing toolbox
Some useful tools for mesh processing

Submitted

Frequencies of prime gaps
Function to compute and display the cumulated frequencies of gaps between consecutive prime numbers

Can Matlab cellular functions -like cellfun- work with non linearly spaced indices ?
Thank you dpb and Steven Lord for your answers. I am going to test your solutions. Edit : yes indeed it is sieving. N may then t...

23 days ago | 0

Question

Can Matlab cellular functions -like cellfun- work with non linearly spaced indices ?
Hi, I would like to affect a value to some non linearly indexed elements of a vector with using a cell array. At the moment ...

24 days ago | 3 answers | 0

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Submitted

Geoid
Function to compute, display, and save a icosahedron based geoid at any iteration (vertices + triangles)

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Platonic solids
Function to compute, display, and save the five platonic solids. Also mesh them with triangles or other polygons (square, pentag...

Submitted

Simplex convergence animation
Simplex algorithm convergence animation demo on Matlab 'peaks' test surface

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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

Solved

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...

6 months ago

Solved

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: ...

6 months ago

Solved

"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) ...]...

6 months ago

Solved

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)).

6 months ago

Solved

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...

6 months ago

Solved

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...

6 months ago

Solved

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...

6 months ago

Solved

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] ...

6 months ago

Solved

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...

6 months ago

Solved

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

6 months ago

Submitted

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

Submitted

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.

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...

7 months ago | 0

Question

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 ...

7 months ago | 5 answers | 0

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Submitted

Mesh generation toolbox
Some useful tools for mesh generation

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

Submitted

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