0
votes
1answer
54 views

Unable to configure a system of differential equations

My differential equations have been written as ...
4
votes
1answer
95 views

How can I prevent a Plot expression from evaluating points forbidden by its RegionFunction?

I just ran into this and it had me scratching my head for a good while. Say I have a function which may produce error messages for certain inputs, like e.g. ...
8
votes
1answer
133 views

How to change the appearance of a group opener?

I would like to change the GroupOpener appearance. In the present Mma design it is too small and can be missed by a reader unfamiliar with Mma. I know, how to change its color through the ...
-1
votes
0answers
69 views

Errors of machine precision [closed]

I receive this error and do not understand this. What is it? Actually I'm not doing any ABS or Log of something I don't know how it has popped up in calculations? N::meprec: "Internal precision ...
1
vote
1answer
37 views

Multiple Linear Regression - obtaining equation with constant term

I am trying to use the LinearModelFit function to obtain a linear regression of my 5 inputs for my single output. I have the input data: ...
0
votes
1answer
53 views

How to manually set z-axis values in a 3d plot?

I'm plotting an hemisphere with ...
2
votes
0answers
27 views

ContextPath and autocompletion with subpackages

I'm developing a larger package which includes several subpackages. My problem is, that I can't introduce the symbols in the subpackages to the autocompletion by loading the main package, but by ...
0
votes
1answer
76 views

Plot Notes present in sound sample

I would like to visualize a sampled sound, and place the sounds as notes starting from C0 to A8 or such. I have a table of ...
1
vote
1answer
81 views

Behaviour of OutputResponse in ListLinePlot

Ok, I think this is not the best way to do this, so I'm open minded for every suggestion doing it in a better way. The Question is why does ListLinePlot not plot ...
0
votes
1answer
68 views

What is the comment shortcut?

I went to a Wolfram Technologies workshop a few weeks ago and the presenter showed us a keyboard shortcut that when a block of input is selected, the shortcut puts the block of selected input in ...
0
votes
1answer
80 views

Vector-calculus [duplicate]

I have a table of 200 elements, elements are '0', '1', '2'. I have participate them into groups for 20 elements each one. Then I have calculate how many '0', '1', '2' are in each part. And then in ...
0
votes
0answers
16 views

How to set up the font size permanently (i.e. for all notebooks, all future sessions?) [duplicate]

The default input / output font size in Mathematica's notebooks are too small for my screen. I would like to set up permanently a conveniently larger font size so that in any future session I get ...
1
vote
1answer
71 views

What is happening in Map[Function[x, x^2], a + b + c] from the Pure Function tutorial

The Pure Function tutorial gives an example: Map[Function[x, x^2], a + b + c]. I would expect the output to be (a + b + c)^2, ...
0
votes
0answers
37 views

How to plot a “pressed” hemisphere [duplicate]

What I'd need is to draw an hemisphere of given radius but then it should have a reduced height. I don't mean a section of an hemisphere, I mean that the hemisphere should be pressed/flattened...so ...
1
vote
1answer
64 views

Sectional averages of a list [closed]

I am working in Mathematica. I have a table of 200 elements. I want to calculate the mean value for the first 20 elements, for the second 20 elements and so on, up to 200. I will get a table (matrix) ...
1
vote
0answers
28 views

CDF to give away with a custom StyleSheet

Related to this. I would like to be able to give away CDF documents created with a custom StyleSheet. The important peculiarity is that this document is assumed to be viewed on a machine with no ...
0
votes
1answer
41 views

A Box for the integral or partial derivative d

I am looking for the name of the box in the Box Language of Mma making integrals, such as those shown in the image below as well as of the sign of the partial derivative. I understand that I can get ...
0
votes
0answers
36 views

How to make the MMA document has the background--color effect when the dounment is printed?

Description: Recently,I use the Mathematica to do my undergraduate paper,I would like to use the Mathematica to compose my paper. So I hope the Input and Output results have the ...
0
votes
1answer
42 views

What is wrong with this code compilation? [closed]

I'm trying to factor this complicated polynomial (and also plot it, but that'll be worked out later)
0
votes
2answers
47 views

Integrating a half-normal pdf

The pdf of a half normal distribution is: $\frac{\sqrt{2}}{\sigma\sqrt{\pi}}$exp$\left(-\frac{x^2}{2\sigma^2}\right)$, $x>0$ ...
0
votes
2answers
79 views

Testing the Erdos square free conjecture

Can someone please answer these two parts of my homework assignment? Adding an explanation would be appreciated! a. Test the Erdos square free conjecture for $n <= 30000$. You should use ...
0
votes
1answer
74 views

Mathematica Implementation of Householder’s Method

I typed the Householder code in this paper, which starts on page 7. The code is: ...
0
votes
1answer
50 views

What is the formula's are used to convert to meters/second? [closed]

Using mathematica, what are the formula's/methods available to convert the following per hour intervals into meters per second (using meters/s from light speed): Kilometer Mile (US) Mile (Nautical) ...
1
vote
2answers
81 views

Getting messages Rest::norest and Divide::indet from ContourPlot3D

Ok I don't know if it's a bug or what, but here's what I found: If I use this function: ...
0
votes
0answers
47 views

Numerically Solving Compatible Systems of Overdetermined PDE

Is there an easy way to get Mathematica to numerically solve a compatible system of overdetermined PDE, and plot the solutions? For example, consider the "toy" example $\dfrac{\partial u}{\partial ...
1
vote
1answer
67 views

Trouble combining planet orbits and positions in Graphics3D and Show

I am building an animated model of the solar system, where I would like to display the OrbitPaths of the planets along with their ...
1
vote
0answers
67 views

Imaginary number appears in Integrate [closed]

I had a problem in the following code because when I use Integrate, there will always be imaginary number in the result. I put my code here. The satisfactory result should look like eq 9.138, which I ...
2
votes
1answer
51 views

Export CSV from tables

I am reading my csv which looks like: float,float,float,integer,boolean I read it with: ...
2
votes
1answer
77 views

Plotting Network with LayeredGraphPlot with specific order

I have a network and want to plot it. I use LayeredGraphPlot, and the network is described as: ...
1
vote
1answer
49 views

Generating a random sample of elements from a list that includes a subset of the list

Imagine I have a list: tList = {item1,item2,item3,item4,item5,item6,...}, and I'd like to take a random sample of numItems ...
2
votes
1answer
46 views

How to return escaped characters from MathLink?

I'd like to return Greek symbols through MathLink from a C function. However, returning the usual escape sequence (such as \[Alpha]) does not seem to work. Here's a minimal example .tm file ...
3
votes
0answers
81 views

Solving huge equations

I have this expression: $d=-\frac{\sqrt{\frac{780 (f+130) \left(5 d^2 (13 c+f+130)-5 d (c (f+1300)-325 (f+160))+125 \left(2 (2 c+725) f+5 f^2+104000\right)+13 d^3\right) \left(5 d^2 (52 c+17 ...
0
votes
2answers
49 views

Evaluating an expression assuming a value for a variable only in the local context

Imagine we wish to evaluate some expression like NIntegrate[x^2*q,{x,0,100}] assuming some value for q like ...
3
votes
2answers
159 views

Replace every Minus to Plus in Expression

Thought this is a rather simple thing, but I was not able to find a solution: I have a polynomial expression like: expr1=a^2-b+c*d expr2=a-b expr3=-a+b-c and ...
0
votes
0answers
46 views

How to parallelize this code

Here I obtained one code which should tests some zeros of the poly for various g, but sometimes I have to many cycles because of step and I need to parallelize the running on all cores. Classical ...
0
votes
0answers
23 views

Discrete Fourier Transform and data manipulate

I solve a system od ODE and i save the discrete solution (i.e.: x,y,vx,vy, or a subset of it) in a file. Then i try to call the DFT on this file but the problem is that i must have also the time in ...
1
vote
2answers
92 views

Sum does not converge, but I think it should

Why does Mathematica return Sum::div: Sum does not converge. >> When I input Sum[Boole[!IntegerQ[x]], {x, 1, Infinity}] The sum is obviously 0.
0
votes
0answers
47 views

A list of cities in a time zone meeting a specified criterion

Is there a way to get Mathematica V9 or Wolfram|Alpha, given a city as input (e.g., "Urbana Champaign, IL"), to return a list of cities that fall in a time zone ...
0
votes
1answer
38 views

Z-Transforms and Floor Functions

When I take the $Z$-Transform of the Floor function: ZTransform[ Floor[x], x, z] I get ...
0
votes
1answer
102 views

iterative programming

i have 3 equations with 3 variables and two constants(to be substituted repeatedly). the value of the variables we got by applying nsolve on the system of 3 equations assuming some initial value for ...
6
votes
0answers
111 views

Automatic replacing of [ with []

I tried to modify the KeyEventTranslations.tr file in order to always place a closed bracket instead of an open bracket once I press ...
0
votes
0answers
40 views

3 Lines for the 3D Axes through the origin instead of a Box [closed]

I'm trying to plot 3D for http://math.stackexchange.com/q/739328/53259: ...
1
vote
1answer
52 views

RegionPlot of a Double integration [closed]

Hey guys I have a problem where I want to sketch the region of integration: Integrate[x Cos[y^2], {x, 0, 3}, {y, x^2, 9}] I know I have to use ...
0
votes
0answers
24 views

Use remote kernel on debian from win8

I spend almost two week to figure out how mma could use a remote kernel. The following is my results: The basic environment is: mma9.0.1 on win8 as my host (local machine); mma9.0.1 on Deiban 7 as a ...
0
votes
0answers
32 views

Gradient method [closed]

conditional gradient method to solve the following problem:f(x1,x2)=x1^2-4x1+x2^2-2x2->min X={(x1,x2)belongs R^2:x1 belongs [0,1],x2 belongs [0,2]} please write a step by step solution, perhaps you ...
4
votes
4answers
275 views
6
votes
2answers
112 views

Rotational Averaging of Image Periodograms (FFTS)

I'm writing a code to do rotational averages of image FFT's. I have a working version but it is pretty slow. Wondering if anyone has any thoughts on a way to do this more efficiently. Data looks ...
4
votes
2answers
203 views

Understanding Transpose

It is very likely that it is my lack of math skills that is showing up here. However, I think Transpose is such an important function that I need to master it. So I ...
0
votes
0answers
43 views

Solving an exponential inequality with parameters

Can I use Mathematica for solving the inequality given below? b^(x/2 - 3/2) - b^(ax) - 2c > 0 where b, a, c are the parameters. I want to find out for what ...
1
vote
0answers
23 views

(Counting problem) very interesting Modular N algebraic eqs - for combinatorics experts [migrated]

We have some attempt to numerically solve this math problem, which means that we like to count the number of independent solutions of this set of six of modular N algebraic equations: $$ (1) x_1 ...

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