Community Profile

# Nicolas Douillet

### PhD, INRIA and CNRS alumni

Last seen: 6 días hace Con actividad desde 2017

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

6 días hace | 3 descargas |

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

6 días hace | 8 descargas |

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

10 días hace | 5 descargas |

PI3MFT
Printable Iterative 3D Meshed Fractal Toolbox

3 meses hace | 5 descargas |

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

3 meses hace | 2 descargas |

Circular meshes
Sphere and torus circular meshes

3 meses hace | 2 descargas |

Resuelto

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...

3 meses hace

Resuelto

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: ...

3 meses hace

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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) ...]...

3 meses hace

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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)).

3 meses hace

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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...

3 meses hace

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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...

3 meses hace

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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...

3 meses hace

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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] ...

4 meses hace

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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...

4 meses hace

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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...

4 meses hace

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

4 meses hace | 7 descargas |

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

4 meses hace | 1 descarga |

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

4 meses hace | 4 descargas |

Respondida
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...

4 meses hace | 0

Pregunta

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 ...

4 meses hace | 5 respuestas | 0

### 5

respuestas

Mesh generation toolbox
Some useful tools for mesh generation

7 meses hace | 9 descargas |

mesh processing toolbox
Some useful tools for mesh processing

7 meses hace | 19 descargas |

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

8 meses hace | 5 descargas |

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

8 meses hace | 2 descargas |

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

8 meses hace | 2 descargas |

Respondida
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...

8 meses hace | 0

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

8 meses hace | 3 descargas |

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

8 meses hace | 3 descargas |