Adrien Leygue

CNRS / Ecole centrale Nantes

Last seen: 4 jours il y a | Actif depuis 2011

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Professional Interests: Complex Fluids, Material Science, Numerical Methods, Model Reduction

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Tensor creation like "pageTensorprod"?
I have two 3x3xN tensors (let's call them A and B) which I would like to combine into a 3x3x3x3xN tensor. More specifically I w...

plus d'un an il y a | 1 réponse | 0

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writestruct does not reproduce the input of readstruct
I find it disturbing that applying writestruct on a structure created with readstruct does not reproduce the original input: see...

presque 2 ans il y a | 1 réponse | 0

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A résolu

Return unique values without sorting
If the input vector A is [42 1 1], the output value B must be the unique values [42 1] The *values of B are in the s...

environ 8 ans il y a

A résolu

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)).

environ 8 ans il y a

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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...

environ 8 ans il y a

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Return elements unique to either input
Given two numeric inputs a and b, return a row vector that contains the numbers found in only a or only b, but not both. For ex...

environ 8 ans il y a

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We love vectorized solutions. Problem 1 : remove the row average.
Given a 2-d matrix, remove the row average from each row. Your solution MUST be vectorized. The solution will be tested for ac...

environ 8 ans il y a

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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...

environ 8 ans il y a

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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] n=0...

environ 8 ans il y a

A résolu

Find the largest value in the 3D matrix
Given a 3D matrix A, find the largest value. Example >> A = 1:9; >> A = reshape(A,[3 1 3]); >> islargest(A) a...

environ 8 ans il y a

A résolu

Check if number exists in vector
Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

environ 8 ans il y a

A soumis

Plane fit
Fits a plane to a set of data points by minimizing the normal quadratic distance

presque 10 ans il y a | 15 téléchargements |

A résolu

The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

presque 13 ans il y a

A résolu

Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

presque 13 ans il y a

A résolu

Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

presque 13 ans il y a

A résolu

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

presque 13 ans il y a

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

presque 13 ans il y a

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Distance walked 2D
Suppose you go from x-y coordinates [3,4] to [0,0] to [0,1] to [1,1], then you walked 7 units of distance.

presque 13 ans il y a

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Add two numbers
Given a and b, return the sum a+b in c.

presque 13 ans il y a

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Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

presque 13 ans il y a

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Geometric series
Find the sum, given the first term t1, the common ratio r, and number of terms n. Examples If input t1=1, r=1, n=7 the...

presque 13 ans il y a

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Nearest
*Description* Find the value and index of the element in vector _x_ that is nearest to value _y_. _y_ should be able to be a ...

presque 13 ans il y a

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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

presque 13 ans il y a

A résolu

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

presque 13 ans il y a

A résolu

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

presque 13 ans il y a

Réponse apportée
Is it possible to solve FEM by Neural Network?
This kind of problem is typically the case where one would use model reduction techniques. I would refer you to methods such as ...

plus de 13 ans il y a | 2

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Condition
Try this: A = rand(1,10); B = A(A<0.5); C = zeros(size(A)); mask = A<0.5; C(mask) = A(mask); I think this could provide so...

plus de 13 ans il y a | 0

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Are iterative methods always better than direct methods for solving large linear systems?
From my personal experience, there is only one case where I have been able to outperform mldivide through the use of one of the ...

plus de 13 ans il y a | 1

| A accepté

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ODE45
First the step in ode45 has little meaning since the method is adaptive and will choose the appropriate time step based on a pre...

plus de 13 ans il y a | 1

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Find max of matrix without using built in function.
The following code will extract the minimum over each column. No loop no max no min and of course not optimal. Feel free to adap...

plus de 13 ans il y a | 0

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Adrien Leygue

CNRS / Ecole centrale Nantes

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