Tagged Questions
1
vote
1answer
45 views
How to plot multinomial beta from Dirichlet Distribution
I would like to plot the multinomial beta from the Dirichlet Distribution wiki page.
$$\mathrm{B}(\alpha) = \frac{\prod_{i=1}^K \Gamma(\alpha_i)}{\Gamma\bigl(\sum_{i=1}^K ...
0
votes
0answers
90 views
Mathematica or Matlab: Which one should a Computer Science under-graduate choose? [closed]
I regret if you find this question green-horn.But I really need your expert advice to make my choice.I am a CS graduate student whose core subjects are stuff like programming,algorithm ...
0
votes
0answers
28 views
MATLAB plotting issue
I posted this question on StackOverflow, but did not get any answers, so hopefully this will work better.
Is anyone familiar with plotting in the Matlab SISOtool? For some reason, I cannot access the ...
0
votes
1answer
46 views
Matlab: How to Exclude Zero from Domain?
I want to plot the wireframe surface of $f(x,y)=\frac{x^2-y^2}{x^2+y^2}$ in Matlab. The code I typed is as follows.
x=-0.1:.001:0.1;
y=-0.1:.001:0.1;
[X,Y]= meshgrid(x,y);
...
0
votes
1answer
123 views
Using libsvm on Octave (Windows) [closed]
I want to use libsvm on Octave (on a Windows platform). If I understand well from the readme file, and from a dozens of posts of the internet, I don't have to make or compile anything, only copy the ...
-1
votes
1answer
92 views
Remainder theorem and computation in mat lab
Respected Mathematicians,
Suppose we are given 10 remainders each of 10 digits for given ten distinct prime bases each of 10 digits. Find the rational number that corresponds to these remainders in ...
2
votes
1answer
219 views
MATLAB Fermi-Pasta-Ulam lattice model can't force periodic boundary condition
I am building MATLAB code to implement a symplectic integrator using a second order split-step method for the Fermi-Pasta-Ulam problem.
The Hamiltonian is in the form:
H = sum from i=1 to N ...
11
votes
1answer
3k views
Is Sage on the same level as Mathematica or Matlab for graph theory and graph vizualization?
The context:
I'm going to start working on a project that involves running predefined algorithms (and defining my own) for very big graphs (thousands of nodes). Visualization would also be welcome if ...
0
votes
1answer
166 views
How to plot graph y=1/x or y=x^2
I am using Octave but I think it applies to MatLab too, so I'm tagging this MatLab since there isnt a Octave tag
When I do
x=linspace(-5,5,25)
y=1/x
I get
...
1
vote
1answer
279 views
Does MATLAB take care of sparsity itself?
Suppose i have matrix of size 1000*1000 with 70% sparsity. I am performing some multiplication, inverse operations upon it. While making calculations, does MATLAB make checks to see if matrix is ...
0
votes
1answer
685 views
In this Cholesky Algorithm in matlab, what is the abs function doing
We have been told in our homework to implement the following program:
function A = Cholesky(A)
% Cholesky Decomposition of a Matrix A, so that the resulting matrix L gives A=L*L
N = size(A,1);
...
2
votes
1answer
5k views
Implement a program in Matlab for LU decomposition with pivoting
I need to write a program to solve matrix equations Ax=b where A is an nxn matrix, and b is a vector with n entries using LU decomposition. Unfortunately I'm not allowed to use any prewritten codes in ...
0
votes
0answers
199 views
Wiener-Hopf solution matrix multiplication help
I'm trying to implement this in matlab: w = R_xx^-1 . S where R_xx is a 150x150 matrix and S ...
0
votes
1answer
240 views
Matlab: Website with a lot of functions to download
I am looking for a website that contains a collection of functions, more than Matlab contains, to download I use from Matlab.
The extension should be *.m or the code should appear.
Thank you!
1
vote
2answers
2k views
Find equation of curve fit programmatically in Matlab?
In MATLAB, when you plot something, there's a tool available which is called "curve fitting". And if you have a set of data points and a linear correlation, this tool will easily come up with an ...
3
votes
1answer
996 views
Numerically Solving a Second Order Nonlinear ODE
Okay, I have this not so pretty 2nd order non-linear ODE I should be able to solve numerically.
$$f''(R) + \frac{2}{R} f'(R)=\frac{0.7}{R} \left( \frac{1}{\sqrt{f(R)}} - \frac{0.3}{\sqrt{1-f(R)}} ...
0
votes
3answers
538 views
Finding positive integer solutions to functions with only positive integer input
For the equation
$f(x,y) = x^2/y$
given that $x$ and $y$ are integers
What is the easiest/fastest way to find at least one tuple $(x_0,y_0)$ solution to $f(x,y)=4$ or any other number really. I ...
35
votes
9answers
13k views
What should I learn first, Mathematica or MatLab?
I have a non-professional interest in math and I would like to be able to be curious and play around with some math that I'm learning about (both here and from calculus-and-higher level math classes).
...
