11
votes
1answer
107 views

Is there a way to stop Export if the file size is too big?

I've got code that's exporting a file, but the file might be so big that it will take up too much space on the cluster I'm using and crash other users' processes. Is there anything like ...
2
votes
1answer
71 views

Identically styled cells from ToBoxes and Cell do not align

I'm trying to generate some worksheets using NotebookWrite so that I can control the page breaks, but have got stuck on the alignment as there appears to be a ...
8
votes
1answer
557 views

How do I generate cross sections of a 3D graphic?

I would like to approximate the volume of a bottle by summing up the volume of the individual disks. I have obtained code references from a demonstration. But how do I generate the cross sections? The ...
2
votes
1answer
164 views

Mean curvature of Sphere

I am trying to calculate mean curvature of a parametric surface(like sphere), and I wrote this code based on this discussion. Here is my code: ...
4
votes
2answers
408 views

Plane Geometry Diagrams With Labels

I can make some basic diagrams in Mathematica (stolen from their pages, for example see the below: LaminaData["FilledIsoscelesTriangle", "Diagram"] However, I'm ...
1
vote
1answer
127 views

How to calculate minimum positive solution of a equation?

Equations with triangular function usually have multiple solutions, like Solve[Sin[x] == 1/10, x] returns a solution like ...
1
vote
1answer
116 views

Problem using Compiled Function within NProbability

I've built a very simple function to estimate the probability for a Long Straddle (derivative strategy) to be positive at expiration. ...
1
vote
1answer
288 views

How can I stop the integration of NDSolve with a condition?

I try to solve a partial differential equation by NDSolve. At some point, I want to stop the integrating by a condition that compares the min value of the function ...
6
votes
2answers
275 views

Apply Trig Identity to Transform Sum of Sinusoids into Phase-Shifted Cosine Function

I'm trying to solve for the output of a simple RC low-pass filter, with Cos[w t] input. The convolution of the input with the RC transfer function gives me the right output, but I'd like to be able to ...
5
votes
0answers
278 views

What is the algorithm behind Mathematicas Reduce in this equation?

Mathematica can use Reduce to arrive at an answer in this equation ...
3
votes
3answers
343 views

Higher-order, nonlinear differential equation with Initial Values

I tried to solve for an non-Hookean spring's motion, but the output from Mathematica is weird. It seems that there is inverse functions involved. ...
6
votes
2answers
105 views

Mathematical operation on two lists by a “key” [duplicate]

I'm a complete newb here. Just looking for direction. I've got two lists like this... ...
3
votes
1answer
168 views

Image background subtraction using parallel computing

I am developing a program for pattern recognition. I want to use the parallel computing to get a real time application. I have two cameras where each one gives n frames/second. I need to process the ...
1
vote
1answer
468 views

Derivative of an expression containing a symbolic sum [duplicate]

Is there a general pattern for working with symbolic sums in Mathematica? For example here's a derivative I want to compute: ...
5
votes
2answers
367 views

Plotting two recursive functions

I'm trying to plot two recursive functions (p and θ) on a map. So far I have: ...
1
vote
1answer
194 views

Rationalize complex numbers

What is the best way to rationalize complex numbers, if not both the real and imaginary part are actually rational? According to the documentation, Rationalize ...
2
votes
1answer
437 views

Plotting on the Raspberry Pi

I just now powered on my new Raspberry Pi for the first time and tried the supplied Mathematica (Wolfram Language). One thing I tried was Plot[x, {x, 0, 1}] ...
4
votes
1answer
134 views

How to use Tandem Queueing Network Process?

Mathematica provides QueueingNetworkProcess and QueueingProcess. However, I can't seem to figure out how to create a tandem ...
0
votes
1answer
94 views

How to tell Eigensystem the type of the elements comprising a matrix I would like to diagonalize

How can I tell Eigensystem that a matrix $M$, which I would like to diagonalize, is a numerical matrix of complex numbers? My idea is that this information could ...
5
votes
0answers
112 views

Unexpected behavior from Indexed

I was going to include Indexed in this answer, thinking that it operated much as a List-only ...
2
votes
2answers
122 views

DSolve returning { } when given my ODE

Why does this code return {}? ...
1
vote
1answer
73 views

Summing subsets of array

I have an array farr, size Nx*Nx. I have a function frk that maps index {n,m} to an integer (approximately ...
0
votes
1answer
69 views

Loops for Unit Root Test

I want to compute some unit root tests on a data generating process. I already split the sample in 100 single samples, but how can I do a unit root test on all of them and store the results in another ...
2
votes
3answers
328 views

Extracting coefficients from a power series

I have a function defined explicitly as a power series: $$\sum_{n=0}^\infty{T_n}\frac{x^n}{n!}=\frac{\frac{x^3}{3!}}{e^x-1-x-\frac{x^2}{2!}}$$ and I would like to extract the coefficients $T_k$ as ...
3
votes
1answer
152 views

Draw function with different colors associated to a parameter

I want to generate a plot similar to this one, which allows for different colors when given different parameters : (This is the Moreau-Yosida regularization of the absolute value) the Moreau-Yosida ...
0
votes
1answer
58 views

Verticepair - route matrix

I have the following problem. I have two lists: list1 defines all possible commodities in a network g. E.g. Form vertex 1 to ...
8
votes
2answers
148 views

using memoization with conditional statement

I would like some advice about the use of memoization in conjunction with conditional statements. Let me try to explain my problem: I am constructing a function depending on a number of parameters. ...
7
votes
1answer
353 views

Poincaré map for dynamic billiard

There's a very nice demonstration of dynamic billiard written by Dan S. Reznik that can be found on demonstrations wolfram(along with the code): here I was thinking whether it would be possible to ...
2
votes
3answers
148 views

Concisely returning a position in an array with an index variable [closed]

We have an array and an index in the array: exampleArray = Table[{a, b, "q"}, {a, 1, 10}, {b, 1, 10}]; arrayIndex = {5, 4}; Very simply, we can return the value ...
19
votes
4answers
840 views

Drawing the schematic diagram of algorithm

The B-Spline function used the alogrithm as shown below: I would like to draw it in Mathematica (Although this is my first time to use TreePlot) ...
3
votes
1answer
70 views

A problem about sorting final result

Three days ago, I asked a question about B-Spline Basis fuction here @Michael E2 given a solution to make the order of interval looks normal The easiest way would be to sort it afterwards: ...
0
votes
0answers
47 views

Plot is not accurate [duplicate]

I defined a matrix and use it to transform a square defined by four points. (In[85]) It seems the transformation keeps the length of the square. (In[91]) Now I plot the original square, the axis of ...
1
vote
1answer
240 views

create a function that converts a character string consisting of lowercase letters of the english alphabet to a number

I need a function that will take input as a string of lowercase letters and then output integers in this form a=01 b=02 c=03 d=04 e=05 . . . z=27 The letters must correspond with these integers ...
2
votes
2answers
61 views

replace an interval of values [duplicate]

I want to replace values in an interval [a,b] by 0 in a list of values. Example: {{.5,.2,.49,1,1},{.49,.5,.495,1}} I want to get: ...
0
votes
1answer
153 views

ParametricPlot3D/2D won't work and leaves a blank space

I've been trying to evaluate this line ...
8
votes
1answer
236 views

why CopyFile cannot overwrite existing file?

CopyFile return $Failed when the file exists on destination. is there any way to force CopyFile to overwrite the existing one? the way I use now is DeleteFile and ...
1
vote
0answers
32 views

LibraryFunctionLoad not recognizing datatype

I am trying to use LibraryFunctionLoad with a function that relies on a derived type that is defined within the library. I've loaded the library prior to calling ...
4
votes
2answers
113 views

Equivalent of RadialOutside for Graph VertexLabels

I'm creating a circular graph and want the labels to be placed on the outside of the vertices in a circular manner on the outside of the graph. I've been playing around with the ...
5
votes
3answers
151 views

Mapping a function of the form matrix[[row,column1;;column2]] over a list

I want to create a list of lists of values by mapping values[[row, col1;;col2]] over a list like {{r1,c1,c2},{r2,c2,c3},... } to ...
2
votes
2answers
244 views

Solving a system of nonlinear equations 2

Regarding this question: Solving a system of nonlinear equations When I try to solve the same system (with the code proposed in Daniel Lichtblau's answer) with different Right Hand Side values, ...
2
votes
2answers
162 views

Include Formatting Save As .nb to .m

Is there a way to export Input Cells in my current notebook(.nb) as a .m file while including indents? For example if my notebook contains ...
13
votes
2answers
486 views

How to build a 3D graph from a 3D matrix?

Following this and that question and the corresponding answers, Mathematica can build 2D graph from 2D matrices. Question How to make the corresponding 3D graphs from 3D cubes? Attempt ...
2
votes
1answer
112 views

Please explain this while-loop

Code: ...
1
vote
2answers
66 views

Simplification assumptions strange behavior

I am trying to cancel common factors under square roots in some expression with all positive real variables: $$\text{Simplify}\left[\frac{\left(3+\sqrt{6}\right) \sqrt{g} \text{nn}^4}{2 ...
3
votes
4answers
217 views

How to Remove Undirected Edges that are the Same [duplicate]

Given: theData = {1 <-> 2, 2 <-> 3, 2 <-> 1} I would like to remove any duplicates where I define a duplicate to be: ...
5
votes
0answers
130 views

TimeSeries for non-temporal data

Mathematica introduced TemporalData in Mathematica 9. Mathematica 10 added several fantastic new TimeSeries manipulation tools ...
2
votes
3answers
193 views

RegionPlot won't finish, but Plot3D does

I would like to produce a region plot where some function is less than 1. This runs for hours without finishing (until I lose patience and abort it). However, I can plot the function (using ...
1
vote
1answer
101 views

Matrix elements scope definition

Alright, I'm very new to Mathematica and I have yet to learn a lot so please bear with me (sorry if this is a duplicate!): I want to create an $n\times n$ matrix $C$ with elements $c_{i,j}$ with $i,j ...
4
votes
1answer
201 views

How to translate image points position(row, column) to their coordinate(x,y)?

Here is the code to find image edge and record the morphological connected pixels positions. How to translate the row/col positions to x/y coordinates? ...
2
votes
3answers
81 views

How to get an element of a list , which is computed out of substituted variables?

What is the best way to get the element of a list, which is computed out of substituded variables? For example one wants to get the first element of the first row of ...

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