Question

Multiply Each Matrix in Cell Array by a Different Value

I have a cell A = {[1 2; 3 4]; [5 6; 7 8]}; and a vector b = [1; 2] and I want to multiply each matrix in A by t...

3 years ago | 1 answer | 0

Answered

How to save variables from function output to workspace?

You are probably calling the function in a wrong way from your script/command line. [A,B] = GetText(filename); will save...

How to save variables from function output to workspace?

You are probably calling the function in a wrong way from your script/command line. [A,B] = GetText(filename); will save...

3 years ago | 2

Answered

How do I force MATLAB treat my variable 'range' as a variable instead of a function ?

Simply create a copy of the variable assigning a different name?

How do I force MATLAB treat my variable 'range' as a variable instead of a function ?

Simply create a copy of the variable assigning a different name?

3 years ago | 0

Question

Sort Coplanar 3D Points Clockwise

I have a set of 3D points that form a polygon. The points are coplanar, due to the fact they are obtained by means of a Voronoi ...

3 years ago | 1 answer | 0

Question

Compute Gradient of a Scalar 3-D Field Defined On a non Uniform Grid

I have the values of a scalar Field in 3 dimensions over a randomly arranged set of points in space. How do I calculate the com...

3 years ago | 0 answers | 0

Question

Generate random coordinates inside a convex polytope

I am trying to generate a random set of coordinates inside a randomly-shaped (convex) polytope defined by its bounding surfaces....

3 years ago | 3 answers | 4

Question

Retain IDs of rows kept by the Unique function

I have a matrix composed in the following way: [ID_1 ID_2 Resisting_Area] ID_1 and ID_2 are integer values, Resisting_Area i...

3 years ago | 1 answer | 0

Question

Find which tetrahedron in a Triangulation contains a Given Facet

I have a Delaunay tetrahedralization, defined by a Coordinate Vector "X" (of size n x 3) and tetrahedra IDs "TRI"(of size m x 4)...

3 years ago | 1 answer | 0

Question

Using a Variable calculated in a parfor loop

I am calculating the internal forces of the finite elements in a mesh inside a parfor loop: parfor iel=1:nel id_1 = ...

4 years ago | 0 answers | 0

Answered

Changing large matrices by not completely loading them into memory

Did you check the sparse command out?

Changing large matrices by not completely loading them into memory

Did you check the sparse command out?

5 years ago | 0

Question

Code Slows Down if I Preallocate Larger Variables?

Hello, I am using Matlab to explicitly integrate equations of motion for a finite element mesh. In the code I initialise all t...

5 years ago | 0 answers | 0

Question

Calculate and Assembly Stiffness Matrix in Parfor Loop

Hello, I am working on extensive lattice networks, so I need to deal with very big stiffness matrices and enormous numbers of...

5 years ago | 1 answer | 0

Question

Constrain a Delaunay Triangulations With a Surface?

I would like to perform a Constrained Delaunay Triangulation by inputing a Surface to define the Constraint, instead of the Edge...

5 years ago | 0 answers | 1

Question

Find Row Vectors In an Array Containing Only Elements from a Vector

Having a matrix A = [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16] and a vector b = [1 2 5 6 7 8 9 13 14 15 16]' I would like to...

5 years ago | 1 answer | 0

Answered

find function with floating points number

http://www.mathworks.com/matlabcentral/answers/9021-approximately-equal-or-egual-to-error

find function with floating points number

http://www.mathworks.com/matlabcentral/answers/9021-approximately-equal-or-egual-to-error

6 years ago | 0

Question

Deleting Triangulation Entries from a Delaunay Triangulation Based on Indices Given by a Logical Array

Hello, I am using Delaunay Triangulations to map a 3D space. Given certain criteria, I select a certain number of points to b...

6 years ago | 1 answer | 0

Question

Calculating Sphere Cube Intersection

Hello, I want to evaluate wether a given sphere intersects a cube/parallelepiped or not. A normal check on the distance from th...

6 years ago | 0 answers | 0

Question

Two identical commands take different times to run?

I am running this function inside a bigger script: <</matlabcentral/answers/uploaded_files/9047/Cattura.JPG>> K11 and K12 ...

6 years ago | 2 answers | 1

Question

Partition a Big Matrix Into Pieces According to Values from A Vector

I have a big matrix (approx 2000x2000 size). Based on another boolean vector (which is 2000x1), i want to remove rows or columns...

6 years ago | 1 answer | 0

Answered

One specific line of a function is taking too long

New informations about the issue: * Making K global doesn't change anything. Still same runtime. * By-passing the function a...

One specific line of a function is taking too long

New informations about the issue: * Making K global doesn't change anything. Still same runtime. * By-passing the function a...

6 years ago | 0

Question

One specific line of a function is taking too long

I am having issues with a particular function. Also, it is a very simple one, with very quick calculations in it. It serves to a...

6 years ago | 2 answers | 1

Question

Error while using size(A,1)?

Hello, I am trying to evaluate the number of rows of a certain matrix 'Conn' using d = size(Conn,1) If I initialise the ma...

6 years ago | 1 answer | 0

Question

Using the answer of inputdlg into a Matlab Expression

Hello everybody, I am trying to write some piece of code which asks for the name of a previously defined variable and uses th...

7 years ago | 2 answers | 0