4
votes
7answers
443 views

Given a symbolic expression how to find if starts with a minus or not?

I am using a Mathematica function which returns some error term in symbolic form. I needed a way to determine if this term starts with a minus sign or not. There will be only one term. This is to ...
5
votes
3answers
333 views

Interpolation steeply drops to 0 beyond data

I use Interpolation on unstructured 3-D-Data to visualize different regions via RegionPlot. A problem I run into is that the interpolating function steeply drops to zero beyond my set of data. This is ...
0
votes
3answers
228 views

Given a Boolean representation of a system, how can the Reliability Function be displayed as symbolic algebra?

Can Mathematica 9 convert a Boolean representation of an RBD to its symbolic algebraic form? If I have a simple series Reliability Block Diagram made up of 2 components, c1 and c2 bexpr1=And[c1,c2] ...
0
votes
0answers
239 views
4
votes
1answer
264 views

Create ParametricFunction object without ParametricNDSolve

Documentation of v9 states that ParametricFunction is generated by ParametricNDSolve and ...
4
votes
4answers
173 views

Robust function for manipulation of nested lists

I have a nested list of the form: ...
0
votes
0answers
473 views

Using Solve Within Manipulate to Model Feedback Control System Problem

This post is extremely long and I do apologize - but please bear with me with all the explanation of the context of the question - due to how long the code is I have included a hyperlink where you can ...
6
votes
2answers
608 views

Displaying index as subscript on output: e.g. C[i] -> C_i with Notation[…] or Interpretation[..]?

You have all convinced me not to type in formulas with subscripts. However, in order to be able to match the subscripts in my whiteboard math, I figure a 2nd best solution is to want to display ...
0
votes
1answer
707 views

Bifurcation diagrams for system of equations

I am interested in constructing a bifurcation diagram for parameter a in the dynamical system given in the code below. I want to see how parameter changes affect the stability of the system. The ...
6
votes
1answer
151 views

Moles/Liters doesn't get simplified to Molar even though Molar*Liters gets simplified to Moles

Why can't Mathematica 9 simplify mol/L to M, when it can simplify M*L to mol? ...
1
vote
0answers
239 views

CUDA* commands are very slow on OS X and Mac

I have Mathematica 8.0.4.0 installed on my new MacBook Pro running OS X 10.8. I also have the latest CUDA drivers (and even the CUDA SDK) from nVIDIA. I've noticed that commands like CUDAQ[] take a ...
4
votes
1answer
139 views

Why are the two shades of the same color in this figure?

Given $S \subseteq \mathbb{C}$ I am trying to plot $f(S)$ for given complex valued function $f$ Looking at other answers on this site for similar questions, I came up with this ...
2
votes
0answers
61 views

Simplifying a quadratic [duplicate]

I have a general query about simplifying expressions in Mathematica, which I will illustrate using quadratics. If I tell Mathematica to simplify $a x^2 + b x + c$ then ...
0
votes
1answer
288 views

Plotting region $f(S)$ for given complex function $f$ and $S \subseteq \mathbb{C}$ [duplicate]

I have a function $f: \mathbb{C} \rightarrow \mathbb{C}$ and I want to be able to see the effect of $f$ on any particular region of $\mathbb{C}$ e.g. what happens to the unit disk under this ...
3
votes
2answers
238 views

Exporting graphics without X server

I have a Mathematica installation on a Linux server that is intended to be used for batch processing. Some of the things that will be processed will include rendering of graphics. However, if I use ...
2
votes
1answer
312 views

Demonstrate aliasing effect in sound

I'm trying to demonstrate the aliasing effect using sound, that is, when the sample rate is fixed and the sound frequency is increased, we would hear the sound pitch go down when we pass the Nyquist ...
0
votes
1answer
117 views

Arbitrary number of variables in Module, Block, etc

How do I specify an arbitrary number of variable names and initialize them inside of a Module or Block? For example, I want to do something like: ...
2
votes
2answers
466 views

About Argument of complex numbers

Suppose my z = x + iy Now, if y=0, then z = x i.e it becomes a real number So, logically ...
2
votes
1answer
257 views

How to compute a discrete histogram of a list [duplicate]

I'm trying to compute the discrete histogram of a set of values. By histogram I mean the absolute frequency a value appears on the dataset, by discrete I mean the values are from a discrete set, e.g. ...
1
vote
2answers
152 views

How to automatically put the part of a variable name after the first letter in symbolized subscripts?

So here is what I have thought: Use ToString and StringLength in order to get the number of characters in the variable name. If it is bigger than one, change variable name by putting everything but ...
2
votes
0answers
84 views

Assign variables from list inside With or Module

I have found that it is possible to assign variables from lists, as follows. In[1]:= r = {1, 2, 3}; In[2]:= {a, b, c} = r; In[3]:= b Out[3]= 2 However, if I try ...
0
votes
1answer
128 views

Reuse a dynamic list [duplicate]

Consider this Dynamic list ...
1
vote
0answers
133 views

why maxrecursion didn't work if I specify singularity in NIntegrate

I study sigularity specification and MaxRecursion in NIntegrate. And find something unusual. first I define a function δ[x_, y_: 1/100] := 1/π*y/(x^2 + y^2) ...
0
votes
1answer
142 views

How do I scale three independent variables in a Manipulate?

cross-posted on the Wolfram Community forum I'm trying to ilustrate the difficulties in assigning bins to a data set and then running a comparison of the bins against a binomial distribution for all ...
0
votes
1answer
261 views

Using Log when working with a time-series

I have a time-series list of stockA, which I call bas. I have taken the natural log of bas by using ...
1
vote
1answer
714 views

Interpolation Problem

I have the following list: ...
14
votes
2answers
614 views

Encrypt the password used for SendMail

I want Mathematica to send me an email when the computation is finished. To that end, I have a cell with SendMail[...] which I place behind my computation in the evaluation queue. The problem I have ...
5
votes
5answers
388 views

Creating partly filled disks based on percentage

I'm trying to create a function that returns a partly filled Disk, based on a percentage. So inputting 1 would give a fully ...
14
votes
3answers
635 views

Detecting and correcting gradational brightness variations in a grayscale image

I am trying to quantify the proportions of various components in a greyscale image (backscattered electron image of a polished rock sample). Here is the original image: ...
4
votes
0answers
91 views

Simplifying expressions involving Divisible

FullSimplify[ Divisible[p^2 - 1, 24] , Element[p, Primes] && p > 3] Should evaluate to True, but I get ...
4
votes
1answer
528 views

How can I commit files to Github by Mathematica?

How can I publish Notebooks to Github via using Mathematica? I'm on windows 8.1 x64, Mathematica 9. How can I upload the current notebook to Github? My function expected is: ...
2
votes
0answers
89 views

Counter assignments [duplicate]

I'm trying to create a specific outline format to match some course materials I am required to submit in a particular way. I know how to create auto-numbered cells using ...
2
votes
1answer
252 views

Errors when using ParallelTable inside a package

I'm developing a package that contains a function that requires evaluation of an expensive Table, so I use ParallelTable ...
0
votes
0answers
96 views

Unexpected result from InverseFunction

Given the following two equivalent inverse functions, why does one simplify (using inverse functions that are acceptable to me) and the other doesn't? Is there an assumption or setting I can give ...
2
votes
0answers
82 views

Setting Up Lightweight Grid On Multiple Clients Programmatically

I have a number of computers which all might need to use the same (client) configuration for the Wolfram Lightweight Grid at some point. I know that there are ways to programmatically set certain ...
6
votes
1answer
433 views

Importing DICOM images

When I try to Import individual DICOM (.dcm) files from http://www.osirix-viewer.com/datasets/ datasets I can see the Elements listed in example files, ie: ...
8
votes
2answers
556 views

Is there any fast way to solve a quadratic matrix equation in Mathematica approximately?

Let the square nonsingular matrix $M$ is a given convergent matrix. What are the best scalar values for $\alpha$ and $\beta$ (in the real numbers domain), at which the following quadratic matrix ...
1
vote
0answers
50 views

Best way to power series expand in multiple variables? [duplicate]

A power series expansion of a multivariate function can be performed with the Series command, which performs each expansion consecutively. The results can be a bit ...
2
votes
1answer
176 views

How to define a variable as a function of another variable?

I want to define a variable q which is a function of t. And I want to define another variable ...
2
votes
1answer
503 views

How to simplify Sqrt[1/x] Sqrt[x]?

In my expression, there appear terms of the form A^(B Sqrt[1/C] Sqrt[C]). Mathematica doesn't realize that this is just simply ...
1
vote
1answer
306 views

Linear Integer Programming with absolute values in objective function

I'm trying to solve a problem of the form $$ \left|a_{1,0}+a_{1,1} x_1 + a_{1,2}x_2\right| + \left|a_{2,0}+a_{2,1} x_1 + a_{2,2}x_2\right|\to\min, $$ where $a_{i,j}$ are real-valued coefficients and ...
6
votes
2answers
179 views

Consecutive Print to target same output Cell

Is it possible to conveniently direct the output of consecutive Print statements to the same output without actually accumulating the output in a temporary string/variable. This would be useful in ...
3
votes
3answers
445 views

Making a multiple choice button

I've written the following code to create a multiple choice button that takes an arbitrary number of answer options and will assign a variable true/false depending on whether or not the correct choice ...
3
votes
1answer
216 views

Symbolic Integration of Special Functions

Sorry in advance if this formatting comes out strange, this is my first question! I can't find a way to integrate, e.g., a function of the Hermite polynomials for general (still integer) order. For ...
8
votes
4answers
356 views

BSplineFunction derivatives wrong if using weights?

In my work, I make heavy use of non-uniform rational B-spline (NURBS) functions, defined using the function BSplineFunction with the option defining ...
8
votes
2answers
585 views

Why Fourier doesn't show me the peaks?

I'm trying to identify the frequencies in my time history samples, and I can see a frequency in the time history, but can't see it in its Fourier transform. Here it is : the sample data: ...
3
votes
1answer
296 views

ParametricNDSolve and Constraint satisfaction problem

I am trying to find the values of two parameters that allow for a specific result of my differential equations, under different initial conditions. Given a system of equations: ...
2
votes
1answer
202 views

Writing CSV or alternative

I've tried to export a list to a CSV file. I shut it down after about 20 minutes of processing. The list has 261,000 rows and 30 columns. I finally exported it to a txt file and its size was 111 ...
3
votes
1answer
234 views

Importing a ragged array while ignoring rows that start with “#” [duplicate]

I am new to Mathematica, and I find that there may be a lot of ways of doing this. I was wondering which one might be the most general. I am importing data from ...
0
votes
1answer
781 views

Can graph interpolating function, but not use it. Any thoughts?

When solving a system of differential equations numerically, I get two interpolating functions. I can graph both of these, but when I try to evaluate either of the functions at a point, it just spits ...

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