# All Questions

29 views

### How to set the values into some variables from different lists [closed]

I have a list of Values and a list of variables. I want to set the Values into Variables. Assume the following code: ...
20 views

### Mathematica program for PLUR decomposition of a symbolic matrix using full pivoting

I wanted to ask if there is a Mathematica program for PLUR decomposition of a symbolic matrix M, such that M = P*L*U*R, using FULL (row and column) pivoting, and where R = reduced row echelon form of ...
108 views

### How do I randomly select 'k' positions in a list and shuffle their respective elements without effecting the other elements?

Imagine I have some list: listA = {"a","b","c","d","e","f","g","h","i","j"}; I'd like to randomly select k positions in the ...
43 views

### Computing residues of matrix valued functions symbolically

I have a somewhat specific application in mind, but I've run into this kind of problem a few times and never found an elegant solution. Is there an efficient way to get Mathematica to recognize that ...
52 views

### NDSolve: Couple ODE and PDE

I am trying to numerically solve an equation with NDSolve, where there is a ODE coupled to a PDE, like the following: ...
393 views

### I want to get a special curve in a picture

I have a picture,and I want to get a special curve in this picture ,than draw the line in a new picture.inbut I can't do this . Like this: The picture is this Anybody have an idea?
56 views

### Partitioning a list and gathering statistics on the distribution of values across partitions

I have a one-dimensional array of 200 elements consisting of the numbers 0, 1, 2. This array needs to be divided into 10 groups (20 items each). Then, for each group, I want to count how many of the ...
75 views

### How to work with Interpolating Function?

I'm starting using Mathematica. I have two coupled differential equations and after using NDSolve the output is in the form of a Interpolating Function. I want to Plot the square modulus of one of the ...
24 views

### Ordering the Terms in an Expression [duplicate]

Why does Mathematica almost always put subtractions as the first term in a summation (as a negative summed with the rest)? How do I circumvent this feature so that every occurrence of "-" follows ...
39 views

### Formatting All Appropriate Output as Desired Automatically

I want to output in MatrixForm whenever I have a list/vector/matrix, but I do not want to have to type out the command each time. How can I write one command at ...
130 views

### DynamicModule with Plots and EventHandler

I am making a little animation in Mathematica, along the lines of some of the Wolfram demo projects. I'd like to animate a simulated trajectory of a random process (say a Poisson process), and while ...
48 views

### ParallelTable, ParallelDo and ParallelMap all fail on simple evaluations, a BUG? [closed]

Sorry I am relatively new to the parallel functionality mathematica.. Here is to code: ...
32 views

### Mathematica 9.01 and CUDA under VB 2013 and modified CCompilerDriver

I tried to force CUDA using Visual Studio 2013 C compiler by manipulating the VisualStudioCOmpiler file found at C:\Program Files\Wolfram Research\Mathematica\9.0\AddOns\Applications\CCompilerDriver ...
87 views

### Need to create a function to generate all permutations of Range[$n$] [duplicate]

Basically I need a function that takes a list and gives all the possible permutations of it. The reason I can't use Permutations is that I have to apply another ...
32 views

### Results of ArgMax as a function of a parameter with InterpolatingFunctions

I would like to obtain a function and its derivatives, where the function is defined as the solution to a maximization problem. The obvious approach ...
50 views

### Read in bezier curve from svg file

I am trying to do some calculation of some svg file,After read in with Import["filename","XML"]and some easy operation, I can get the string of the bezier curve, ...
247 views

### Find the longest constant sublist

Given a list list = {1,2,2,2,2,5,1,3,2,6,6,6,6,6,6,6,6,6,6,6,10,-3}; how to find the longest constant sublist (or equivalently the element and the number of ...
205 views

### How can I calculate the limit without using the L'Hopital's rule

I need to prove this limit without using the L'Hopital's rule: $$\lim_{x\to 0} \frac{(1+a\,x)^{1/4} - (1+b\,x)^{1/4}}{x} = \frac{a-b}{4}$$ How can I do it in Mathematica?
452 views

### Why are my recursive functions running so slowly? And how do I fix them?

I am working with making numerical solvers for a modeling class I am in, and I want to use the internal recursion handling that is built into mathematcia, but there seems to be a problem. NDSolve ...
78 views

### combining plots [closed]

I've made the following plot ...
39 views

### Defining a function in Mathematica [closed]

Get the list oddthree of numbers between 100 and 2000 which are the product of three distinct odd primes. Hint: use a Select your condition should be a combination of ...
76 views

### PDF files generated by Mathematica on Windows cannot be viewed on Ubuntu [closed]

I have used Mathematica in order to achieve verify solutions of some ODEs on Windows and generated PDF files out of notebooks. After I switched to Ubuntu 12.04.3 I noticed that the PDF files were ...
62 views

### Same Mathematica 9.1 Student License on both Ubuntu and Windows 7 [closed]

Is it possible to install Mathematica 9.1 on both Ubuntu 12.04.3 LTS and Windows 7 Home Premium on the same machine. I want to be able to use Mathematica on Ubuntu since I wrote some numerical codes ...
78 views

### MathLink c++ passing lists of real values simple example

So this may come down to me not being a very competent programmer but I am struggling with passing list from Mathematica via MathLink that aren't of integers. The final code I am hoping to get out of ...
43 views

### Solving a system of equations where two variables can only be one of several discrete values

I want to solve a three-equation system, but I need to constrain two of the variables so that they can only take one of several discrete values that I would specify (this is a circuit design problem ...
93 views

### Counting the number of instances of one sub-string within a given string within a lower- and upper-bound gap of a second sub-string

Please consider the situation where I give you a list where entries are drawn from a fixed set of characters: ...
153 views

### Compile with array operations

When I use the function f with only the Module ...
79 views

### 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: ...
25 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 ...
37 views

### Machine precision infinity

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

### DSolve failing to solve second-order ODE with two boundary conditons [closed]

I am utilizing Mathematica to solve the following equation: $$y^{''}(x)-5y^{'}(x)+10y(x)=10x$$ The following stated boundary conditions are supplied: $$y(0)=0 \ \ y(1)=100$$ The following error ...
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 ...
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 ...
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: ...
55 views

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

I'm plotting an hemisphere with ...
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 ...
78 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 ...
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 ...
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, ...
38 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 ...