0
votes
2answers
16 views

ListPlot the results of FindMaximum

I want to plot a list of the form whose elements are of the form {value, {x -> value_x, y -> value_y}} The list generated by FindMaximum applied on ...
2
votes
4answers
36 views

How to map Unevaluated over a list

I have a list {a1, a2, ...... , an}, in which all as have been initialized to a number. I want to get: ...
0
votes
0answers
35 views

Improve simulation speed using Compile

I have two square matrices, a hermitian matrix h and an unitary matrix v. I am interested in the following function ...
3
votes
1answer
23 views

Trigonometric simplification

How can I simplify 1/2 (Sqrt[3] Cos[x] - Sin[x]) in order to get Cos[x + Pi/6] on Mathematica? I saw that Wolfram|Alpha lists ...
1
vote
0answers
31 views

Numerical integral speed

I have the following code to calculate a numerical integral for any given a, however it takes a very long time, even with adaptivemontecarlo, which is not accurate enough: ...
0
votes
1answer
24 views

Animating an InterpolationFunction and its integral

I have a list of data that I interpolate (Omega[t]) and animate - it is working fine, but an Integrate over the ...
-3
votes
0answers
16 views

plotting Multiple Functions of graph of trigonometry [on hold]

help me solving this question.i'm using mathematica wolfram version 10.the question is 1 a and 1b.if can, show me the answer in mathematica,i'm quite confused
11
votes
4answers
276 views

A bug in Integrate

Integrate[(1 + 16 Tan[2 x - y]^2)/(1 + 4 Tan[2 x - y]^2), {x, 0, 2 π}] Mathematica (wrong) output is (tested under versions 8 and 10.0, took ~ 1 minute of CPU ...
0
votes
1answer
22 views
2
votes
1answer
51 views

Missing zero in the CoefficientList

The following list has a length only 10 (not 11) CoefficientList[Series[ArcTan[x]/(1-x^2),{x,0,10}],x] {0, 1, 0, 2/3, 0, 13/15, 0, 76/105, 0, 263/315} Should be ...
2
votes
0answers
62 views

Wrong Limit in Mathematica 10.0.0

Limit[(Log[(3+Sqrt[5])/2]/(2*Log[(1+Sqrt[5])/2]))^(-1-2*n), n -> Infinity] Mathematica (wrong) output: 0 But this is ...
1
vote
2answers
151 views

Plotting a Hill function [on hold]

I've Just recently gotten this program and cant plot this function, F(X)=1/(1+(X/K)^n) for X=0 to 4 nmol/m^3, K=1 nmol/m^3, F(X)= 0 to 1, and n=1,2,4,8,16 Now I know how to specify the limits and ...
1
vote
0answers
34 views

How to incorporate the boundary conditions into the differentiation scheme in MMA?

Let that we want to numerically solve the following PDE \begin{equation}\label{sde} -r V(S,t)+r S \frac{\partial V(S,t)}{\partial S}+0.5 S^2 \text{sigma}^2 \frac{\partial ^2V(S,t)}{\partial ...
2
votes
1answer
45 views

Generating and Imaging of the water molecules with Graphics3D

my problem is I don't know how to generate e.g. 20 water molecules: Graphics3D[ Rotate[First@ChemicalData["Water", "MoleculePlot"], 45 Degree, {8, .5, 0}]] ...
1
vote
0answers
41 views

Wrong Limit with LaguerreL

Limit[(n! LaguerreL[n,-1]/(n^(n+1/4)/Sqrt[2]/E^(n-2 Sqrt[n]+1/2))-1) Sqrt[n], n->∞] Mathematica (wrong) output ...
5
votes
3answers
238 views

Generate a list of equations of curves and plot them

I want to plot a series of lines. This is how I did it: ...
-3
votes
1answer
70 views

Interpolate/Extrapolate a gate charge curve from 2 different curves

gate charge measured data I have gate-charge measurement plots and excel data for two operating points for a power mosfet. Vds = 60 V, Id = 50 A Vds = 600 V, Id = 8 mA Can i generate a plot with ...
1
vote
1answer
48 views

How to disable dynamic update in DynamicModule when certain variable is updated [on hold]

I have a UI with DynamicModules. I have a progress bar, whenever the varibale progress updates, the ...
0
votes
0answers
87 views

ODE fitting to dataset

So, I have a ODE system, it is a complex biochemical kinetic mechanism with six species changing over time. ...
0
votes
0answers
56 views

convergence problem - triple integral

I have a problem in convergence ... for i=j=5 is enough to calculate what i want. But for os11[100,5,5]=1.59 ( 1.58 is the real ...
3
votes
5answers
161 views

Converting multi variable expression into a function

So I have this rather complicated looking expression ...
1
vote
0answers
56 views

The image turns black when I use the mouse to rotate it

All, This code ...
10
votes
0answers
95 views

Regime Change Stochastic Process

I would like to simulate an Ito process in which the drift and diffusion terms change after hitting a boundary for the first time. For example, a Geometric Brownian Motion X which has 0 drift and ...
2
votes
1answer
43 views

Missing definition of some parts of function?

I have: BeginPackage["Test1`"]; ClearAll[f]; f::usage = ""; Begin["`Private`"]; f[x_AA]:= 1; f[x_BB]:= 2; End[]; EndPackage[]; When later, on a notebook, after ...
1
vote
1answer
68 views

How do I find the constant term of a multivariate polynomial, when (x^0)(y^0)?

So let's say f[x_,y_]:=(2x+2y+1)^2, when I type Coefficient[f[x,y],x y] I recieve 8. But what can I input to recieve 1, when ...
2
votes
0answers
55 views

Adding a 3D point using Epilog [on hold]

I am trying to add a point using the Epilog option with ContourPlot3D. ...
3
votes
0answers
46 views

Fitting data to plot using errors as weights

I have some enzyme kinetics data that I want to fit to the Michaelis-Menten curve in order to obtain the kinetic parameters of the enzyme. Is it meaningful, statistically and functionally speaking, ...
0
votes
0answers
44 views

n dimension vector expression in mathematica

I have a question about how to write the formula in Mathematica. If $w$ is $n$-dimensional vector, with each element as $w_i : i=1,2,3,...n$ and $n$ is symbol, how to write it as vector in ...
-7
votes
0answers
32 views

i need generalized code for genetic algorithm(an optimization technique)? [on hold]

I'm working on GA coding to optimize the locators position in fixturing system to minimize the error in precision manufacturing.I need generalize code for GA (including random population ...
1
vote
3answers
80 views

Minimize method is not giving minimum. Why?

I was doing an optimization but facing a problem getting what exactly Minimize function do. I run the following code: ...
-2
votes
0answers
15 views

How many workers each company have? [on hold]

If total there are 90 workers between 2 companies and one company have 16 more workers then the other. How many each company have?
1
vote
1answer
68 views

How to speed or help Solve[] when it is stuck?

The code below generates a system of equations that I need to Solve[] for {c[5], c[6], c[7], c[8]} in terms of {c[1], c[2], c[3], c[4]}. ...
0
votes
1answer
18 views

About Manipulate : How to make this work properly?

Manipulate[ Plot[PDF[NormalDistribution[mu, sigma], x], {x, -4*sigma, 4*sigma}], {mu, -10, 10}, {sigma, 0, 10} ] I got the following error:
9
votes
2answers
183 views

Built-in symbols that support operator form

In version 10 some built-in symbols are updated to support operator form like the Derivative. For example, Select, ...
0
votes
0answers
41 views

Pulling the boundaries from a Solidworks Profile in Mathematica

I'm currently trying to take a 2d profile generated in SolidWorks and use mathematica to analyze it. I need to pull lines that represent the boundaries of the shape from an image of the shape. . My ...
0
votes
0answers
22 views

PredictorInformation[] doesn't show linear regression coefficients when model has more than 101 features

I need to train a Predictor[] where both features and outcomes are (arrays of) binary variables. (e.g. {{0,1,0,0,0,1}->1, {0,1,0,0,0,0}->0}) For some reason when I train the Predictor[] using a ...
0
votes
0answers
27 views

Drop elements in Permutations [duplicate]

I have a problem with one excersise. I have a set of {x,y,z,w,u,t}. Then i want to print all possible permutations of the set with length 3 that commits this condition: element "u" not to occur after ...
1
vote
1answer
101 views

Making ReplaceAll faster

I have a list of functions ncalc that is calculated by ...
3
votes
2answers
109 views

definite integration very slow

I have to perform definite integration of function of this kind : ...
1
vote
1answer
55 views

Power::infy: “Infinite expression 1/0. encountered” (ODE Solution using NDSolve)

While solving the following ode, Eq1 = f'''[x] - f'[x]*f'[x] + f[x]*f''[x] - K1*(2 f'[x]* f'''[x] - f[x]* f''''[x] - f''[x]*f''[x]) - f'[x] == 0 with the ...
0
votes
0answers
43 views

FullSimplify cascades too much/groups variables too eagerly

This is something FullSimplify will give: $$\frac{n (s+\text{s2})-\text{a1} g}{\text{a1} (g-\text{a2} s)+s (s+\text{s1}) (s+\text{s2})}$$ I could find better examples where FullSimplify cascades ...
2
votes
2answers
104 views

make trace of a matrix listable?

I have a list of 2 by 2 matrices and I want the list of their traces. I have been using Map[Tr,mylistofmatrices] But I wonder if there is a way to make ...
0
votes
0answers
37 views

NSolve Duration for simultaneous equations solving

At the moment I am asking myself why mathematica gets to point of needing enormous amount of time to solve equations like these when one more "row" or "colum" or both was added in this equations ...
0
votes
0answers
34 views

Dynamic locator missing when image change

I plan to get corner coordinate of desired image dynamically through LocatorPane[Dynamic[pt],back]. However, I notice that locator on right hand side was ...
5
votes
0answers
57 views

LogisticSigmoid residue bug?

On version 10.0 for arm: Residue[LogisticSigmoid[z],{z,I Pi}] gives 0 not 1. Can anyone reproduce this?
-2
votes
0answers
40 views

system of nonlinear partial differential-algebraic equation [on hold]

I want to solve 2 coupled partial differential algebraic equations. Below is my program. I am not able to find the solution. Please help for the same. ...
0
votes
0answers
16 views

How to use PageBreakPalette?

I would like to use PageBreakPallete from http://library.wolfram.com/infocenter/TechNotes/4094/ I did Palettes->Install Palette.. and then in Palettes I have PageBreakPallete. There show Palettes ...
1
vote
2answers
37 views

Table of sections with CellPrint

I am trying to produce a table of sections with each section containing a DynamicModule. My two questions are: (1) How do I produce grouped sections that are folded ...
2
votes
1answer
67 views

Why different output is obtained for the same code (Mathematica 10.1)?

I wrote some code in Mathematica: ...
1
vote
0answers
38 views

Fast construction and reshaping of large tensors

I'm trying to construct a large matrix which is derived from some higher rank tensor (the rank of interest to me changes case by case, so it needs to be a general method). Currently, the process of ...

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