# All Questions

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### How to produce functions [closed]

I want to produce n functions. For example, assume that by giving n=3, 3 definite integrals will be created, like the following: ...
27 views

### Minimize solution to linear system with singular system matrix

I am trying to solve a time-dependent linear system with a singular system matrix, $A$, thus an infinite number of solutions, ${\bf x}$(t), exist that satisfy the linear system. The solution I am ...
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### Machine precision infinity

Is it possible to obtain the machine precision (double) version of Infinity? This is useful when using LibraryLink and C ...
55 views

### Unable to configure a system of differential equations

My differential equations have been written as ...
96 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. ...
135 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 ...
43 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: ...
56 views

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

I'm plotting an hemisphere with ...
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### 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 ...
80 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 ...
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 ...
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 ...
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 ...
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### 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 ...
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, ...
39 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 ...
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) ...
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 ...
44 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 ...
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 ...
48 views

### Integrating a half-normal pdf

The pdf of a half normal distribution is: $\frac{\sqrt{2}}{\sigma\sqrt{\pi}}$exp$\left(-\frac{x^2}{2\sigma^2}\right)$, $x>0$ ...
82 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 ...
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### Mathematica Implementation of Householder’s Method

I typed the Householder code in this paper, which starts on page 7. The code is: ...
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) ...
84 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: ...
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### 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 ...
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 ...
47 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 ...
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 ...
93 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.
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### 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 ...
39 views

### Z-Transforms and Floor Functions

When I take the $Z$-Transform of the Floor function: ZTransform[ Floor[x], x, z] I get ...
111 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 ...
113 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 ...
53 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 ...
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### 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 ...
276 views

### Transform elements in list from form {x_} to form {x_, 0}

I have the following list ...
147 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 ...
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 ...
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 ...
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 ...