2
votes
1answer
44 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
71 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
58 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
48 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
47 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 ...
-8
votes
0answers
36 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
82 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
16 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
72 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
20 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
189 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 ...
-1
votes
0answers
33 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
105 views

Making ReplaceAll faster

I have a list of functions ncalc that is calculated by ...
4
votes
2answers
115 views

definite integration very slow

I have to perform definite integration of function of this kind : ...
1
vote
1answer
57 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
44 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
105 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
38 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
35 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
59 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
41 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
17 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
39 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
69 views

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

I wrote some code in Mathematica: ...
1
vote
0answers
40 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 ...
0
votes
0answers
27 views

Errormessage Set::setps [on hold]

I want to plot some data with ErrorBars. The following code generates the desired image: ...
1
vote
1answer
25 views

How to change size of whole input?

I would like to change size of font of input/output. I see that I can just click on options of single input and set size, but I don't want to do this separately for every line. Could someone help me ...
2
votes
1answer
147 views

How to speed up a symbolic integration

I have a question about an integral. I wanna integrate this: ...
0
votes
0answers
38 views

CharacteristicPolynomial returns 0

I have the following matrix. ...
2
votes
1answer
40 views

Pattern matching & simple replacement

I have a question about an expression that I want to modify. Here is the expression: ...
0
votes
2answers
321 views

Does the equation have two roots? [on hold]

I want to solve the equation $$-x^2+\sqrt{2-x^2} \left(x^2+2 x-1\right)+2 x+5=0.$$ I tried ...
1
vote
1answer
43 views

How can I plot bollinger bands on financial time series? [on hold]

I can't find any options for this in CandlestickChart[], but it's a pretty basic measure, is it not supported?
0
votes
1answer
53 views

Finding the points where the derivative is zero [on hold]

I want to find points where the derivative of a function is zero. Therefore, I discretize the waveform (vbusa) and have substituted time and voltage values into the ...
3
votes
2answers
94 views

Solve for x given an interpolation function, y

Given a list of data, lst={{x1,y2},{x2,y2},...,{xn,yn}} and the interpolation function fun, y=Interpolation[lst] which ...
2
votes
4answers
111 views

ListPlot and filling between curves

I have a simple question. Why is Filling not working in the following? ...
3
votes
1answer
41 views

Using patterns to modify TeXForm output

When I use TeXForm on a matrix I often want to replace some the output with some number of verticle and horizontal lines. Is there a way to get control over this, possibly using patterns? As an ...
4
votes
0answers
67 views

Enforce graph symmetry

I am using ...
11
votes
2answers
396 views

How to speed up Colorize

I have a list of about 500 images similar to the following: A = Import["http://i.stack.imgur.com/1bV4O.png"] ...
3
votes
1answer
90 views

Roots of Whittaker W function

I am interested in finding the roots $u$ of the equation $$ W_{1,\imath b}(a)=0, $$ where $W_{\kappa,\mu}(z)$ denotes the Whittaker $W$ function, $a>0$ is a fixed parameter, $\imath=\sqrt{-1}$ and ...
0
votes
0answers
29 views

Set precision on output dataset [on hold]

How do I set the output precision such that if a value is calculated to be e.g. 9.7942*10^-18, Mathematica doesn't output that value, but it just outputs $0$ instead. I tried ...
0
votes
0answers
70 views

NDSolve and assuming

I am trying to solve the system of PDE with NDSolve and I got an error message like this NDSolve::deqn: "Equation or list of equations expected instead of ...
0
votes
1answer
61 views

Scaling vectors in an animated vector field [duplicate]

I want to animate a VectorPlot3D. But, Mathematica rescales the vectors in every frame. Can you scale them all to one fix point? For example, scale the vectors on ...
7
votes
2answers
200 views

Why does Mathematica say $\int_0^1\int_0^1\int_0^1\frac{1.0}{xyz}\,dz\,dy\,dx=0$?

Mathematica 9 says that $\int_0^1\int_0^1\int_0^1\frac{1.0}{xyz}\,dz\,dy\,dx=0$ and $\int_0^1\int_0^1\int_0^1\frac{1}{xyz}\,dz\,dy\,dx=0$. ...
0
votes
0answers
28 views

Expected value of exponential random variable [migrated]

If an exponential random variable, X, has failure rate λ, what is E[X|X<λ]? I'm not sure how to start here. I know that E[X] = 1 / λ for an exponential random variable. Is the probability that X ...
-1
votes
0answers
28 views

Boolean function conversion to operators(AND,NEGATION) [on hold]

Given some boolean fuction f, how can i convert it into an expression that has only the operators: && and Negation.
1
vote
1answer
40 views

When plot a list, how to Manipulate a sequence of defined functions at the same time?

I am trying to plot a sequence of functions, for example{(a+b)^i},{i,1,100}. All the expressions I have stored in the list. Now I want to plot them and see how their value would change if I change ...
1
vote
1answer
43 views

Unexpected behavior of WhenEvent in NDSolve?

In Mathematica 9.0.1, here is a simple code to numerically solve an initial-value problem: ...
-3
votes
0answers
23 views

Recursion with an exception [duplicate]

I need to print the first 7 members of the sequence a[n] with its reccurence formula a[n+1]=7*a[n]+n, where a[1]=1 and the digit 7 dosnt occur.

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