Questions on the optimization functions of Mathematica such as FindMinimum/FindMaximum, Minimize/Maximize, NMinimize/NMaximize, etc.
15
votes
1answer
420 views
Optimization with assumptions
I have the following problem, when I am trying to optimize function with pre-defined assumptions.
I am using Mathematica 8 and I wrote the following simple code
...
0
votes
1answer
62 views
Working precision for each variable
How can I define working precision for each variable individually
for example:
Maximize[x y< 100, {x, y}]
where the working precisions for ...
5
votes
0answers
202 views
Mathematica vs Sigmaplot (Non LinearModelFit)
I asked a question in a previous post that was closed because "The title of the question is not correct and the issue here is too trivial to help anyone later".
NonLinearModelFit
It's possible ...
4
votes
0answers
83 views
When using NMinimize[…,Method->“DifferentialEvolution”] is an “iteration” different than a “step”?
Hopefully this question has a simple answer. I have the following bit of code:
...
4
votes
0answers
101 views
Speeding up multilinear PRA branch-and-bound algorithm with worst-case exponential time scenario with respect to basic events
The algorithm is a branch-and-bound algorithm that calculates dominances for PRA, probalistic risk assessment. The task was to find faster ways to do it in numerical software such as Matlab but we ...
3
votes
0answers
90 views
Trouble with Minimize
Minimize[{t^2, 1 == 3*t + 16*u}, {t, u}, Integers]
It does not give the solution t = -5 and u = 1.
Am I missing something?
The solution being known and ...
3
votes
0answers
171 views
Semidefinite Programming
I want to solve a numerical optimization problem using semi-definite programming. Is there a package or add-on that equips mathematica with this functionality?
2
votes
0answers
68 views
Speeding up a numerical constrained quadratic optimization
I'm trying to solve a quadratic optimization problem in 35 variables, $\vec{α} = \left< α_1, \ldots, α_{35}\right>$:
$$
\begin{aligned}
&\operatorname*{maximize}_\vec{α}&&1.0\cdot ...
2
votes
0answers
113 views
Why my Mathematica 9.0.1 wont work with some samples of Mathematica in Graph Theory?
I updated my Mathematica recently to 9.0.1 cause the previous version was giving me freaky result especially in FindMinimumCostFlow and ...
2
votes
0answers
182 views
Numerically/Analytically Solving a System of Equations
I have $6$ functions $f_i(x,y,z)$, $(i = 1, \ldots, 6)$ in three variables $x,y,z$, and I would like to find a simultaneous instance of these variables, say $(x_0, y_0, z_0)$, such that $f_i(x_0, y_0, ...
2
votes
0answers
190 views
Having difficulty with the Minimize command
I am having trouble getting an answer to this question...Am I missing something that anybody can see.
...
1
vote
0answers
37 views
NMaximize with matrix input
I defined function f[x_, fixed_] := {...}. Here x is an $M\times N$ matrix. I want to maximize $f$ with respect to $x$. I have ...
1
vote
0answers
51 views
Conditional solution for system of linear equations
I have a linear equation system Q.m = t, with m unkown and where Q has dimensions ...
1
vote
0answers
82 views
How can I say that all quantities need to be positive (and real)?
Can you say at the beginning of a script in mathematica that you want all the quantities to be positive (and real)? So that in all calculations, only the real values of these quantities will be ...
1
vote
0answers
206 views
Methods for NonlinearModelFit
I am using NonlinearModelFit for a thesis project.
I get quite different results if I change the Method to LevenbergMarquardt or QuasiNewton or ConjugateGradient ...
1
vote
0answers
103 views
How to express this output in the form $X=A.x$?
This problem arose in my stereo vision project.
I have two matrices:
$$
A = \left(
\begin{array}{ccc}
\text{x1}*\text{p131}-\text{p111} & \text{x1}*\text{p132}-\text{p112} & ...
1
vote
0answers
133 views
How to find the minimum of a function that is a sum of an analytical function and a series expansion?
I need to get a minimum of function F[ang] which is defined as a function of angle:
...
0
votes
0answers
77 views
Non linear constrained interger Optimization
I need to maximize the equation below which is subjected to some nonlinear constraints
Maximize hsum + isum + jsum + ksum + lsum + msum + nsum + osum
...
0
votes
0answers
55 views
Sudden increase in computation time for similar computations
I'm doing some numerical simulations on a physical system. In the most simplest form I have now the following:
...
0
votes
0answers
57 views
0
votes
0answers
24 views
Error Handling with LinearProgramming and Aborting subsequent evaluations
I am using a inbuilt LinearProgramming solver to perform an optimization. It is essentially solving a matrix equation and searching for a solution that maximizes a ...
0
votes
0answers
95 views
Edit mathematica API
What is the Document Viewer in mathematica purposes other then looking up apis?
For example why can I edit the mathematica documentation, but the content doesn't sucessfully save?
Subgoal: In the ...
0
votes
0answers
307 views
Reduce/NSolve cannot solve a constraint problem?
I am trying to solve the following problem:
Minimize Integral[ (y''[x]+10)^2,x]
Where y''[x]+a*y'[x]+y[x] = 0, and the initial conditions for the DE are
...
