2
votes
3answers
160 views

How to find the kth largest eigenvalue of a matrix, taking into account the sign? [duplicate]

I have a real symmetric matrix m (i.e. its eigenvalues are all real). Eigenvalues[m, {k}] will find the ...
2
votes
2answers
88 views

Insert at specific resulting positions in multidimensional list?

I have an initial "multidimensional" list (that is, a list that is not a vector): list0 = {{1},{2,3,4},{3,4},{5}}; and I want to insert elements ...
2
votes
1answer
82 views

Regular Expression - for html objects

I did a previous research about similar questions, but I really am confuse about using html objects. I have the following situation: I Import a html from a url and I need to pick the numbers that ...
2
votes
1answer
64 views

NIntegrate and Interval regions

NIntegrate does not seem to like Intervals as regions. Consider the following example function defined for a parameter "a" ...
2
votes
1answer
105 views

Mathematica notebook is corrupt

Well great, I had some work done (though it wasn't much, it was just laid out nicely) in a cdf file. My computer decided to shut down on my randomly while I was working on it (some kind of error). I ...
2
votes
3answers
83 views

How to test a condition for a list and output all the expression that is true?

Suppose that I have a list lis={x-y,x+y,x*y}; and a function f[a_,b_]:=#/.{x->a,y->b}& I want to output all the ...
2
votes
1answer
116 views

PlotStyle and Legends

I know only three plot style ...
2
votes
1answer
132 views

Catastrophic loss of precision

while I am trying to solve the double integral in the range of 0 to Infinity (for both the integral) it give me the error Catastrophic loss of precision in the global error estimate due to ...
2
votes
0answers
71 views

Configuring remote access when using a VPN

To address some of the responsiveness issues, I use the Mathematica front end (v9 or v10) to access a remote kernel on a Raspberry Pi. The (advanced) kernel configuration used is this: Arguments to ...
2
votes
1answer
120 views

Using FortranForm for d0 notation?

When I use FortranForm, it changes 2*a^2 into 2*a**2 which is fine, but if I want the expression in a form such as, 2.d0*a**2 which represents an integer to be ...
2
votes
1answer
53 views

RegionUnion issues with many Regions

The new RegionUnion[] function is just what I needed if only I could get it to work. I have many non-overlapping regions that I will need to use as plotting domains ...
2
votes
0answers
75 views

TrigExpand Idiosyncracies

TrigExpand[Sin[x]^2 Log[y]] returns sin^2(x) log(y), as one would expect. However, ...
2
votes
3answers
131 views

Restricting Numbers in a Matrix

I am generating a random N x N matrix, but with a certain restriction. What I'm trying to do is that when there's a "1" in a position, all neighboring positions must turn to "0" (so if [i,j] = 1, then ...
2
votes
0answers
87 views

Generating Mathlink executables by CCompilerDriver

I'm trying to generate a MathLink executable by CreateExecutable from CCompilerDriver ...
2
votes
1answer
142 views

How to load a custom mathematica package from a .m file?

I would like to load the package groebner50.m which is available through the website of David A. Cox. It's supposed to contain some useful tools for commutative algebra, but I haven't been able to get ...
2
votes
1answer
132 views

Analytic approximation of NDSOLVE

I have to solve the following differential equation L'[t] == L[t]^(-3/2) - 0.1 I tried DSolve: ...
2
votes
2answers
114 views

Changing the Ticks in LogLinearPlot for representation pH values

I need to change the ticks in the xaxis for representation pH values, but the ticks are not dispersed along the range of xaxis. Another question: why the vertical line defined with Epilog is not ...
2
votes
2answers
105 views

Include more padding between tick marks and plot [duplicate]

How can I modify the code below to add some padding between my tick marks and 3D plot? It is not a problem in this example, but often my tick marks collide with my axes. ...
2
votes
1answer
61 views

Create a ProbabilityDistribution

I am trying to wrap my head around the function ProbabilityDistribution. For training purpose, I'd like to recreate the binomial distribution (without using it) so that the two code lines return the ...
2
votes
1answer
51 views

Unprotect fails the first time, works on second pass [duplicate]

I am redefining some of the standard math functions. I know this is dangerous, so I am trying to be extra careful. (For instance, in the redefinitions, I make sure to only match a custom head) The ...
2
votes
3answers
71 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 ...
2
votes
1answer
89 views

defining Associated Stirling numbers of the Second Kind

First, I'm new to Mathematica. Spent my undergraduate programming with Maple and my computer crashed and I lost it. Fortunately, my university offers free Mathematica downloads to students, so here ...
2
votes
0answers
48 views

Fine tuning compiled code that computes dilogarithm function

As an exercise of writing a good Compile function, I want to do the simple task of coding a routine that outputs the real part of the dilogarithm function ...
2
votes
1answer
127 views

Proper way to run a Mathematica script (-script vs -run vs MathematicaScript vs <)?

Suppose I have a Mathematica script called test.m. There at least 4 ways to run this from the terminal: ...
2
votes
1answer
255 views

Dynamic graph construction and visualization (Watts' “Small Worlds” α-model)

I need some help in creating a Mathematica program for building and visualizing Watts' "Small Worlds" α-model. This is a variant of the more known (and much more simple) β-model (also known as ...
2
votes
2answers
97 views

How to get `Series` to recognize user-defined function has pole

Edit for clarity: How does Mathematica's function Series know that Gamma[x] has a pole at ...
2
votes
1answer
298 views

Solving a system of nonlinear equations

The bellow set of equations has two answer sets for (α1, α2, α3, β1, β2, β3) respectively as following: (3, 1, 3, 1, 1, 1) & (3, 0.75, 3, 0.5, -1, 0.5) ...
2
votes
1answer
74 views

Find constants in a function? [closed]

Let's say I have a function f[x] with n constants, e.g. f[x] = c1 * x + c2*x^2 + ... + cn *x^n I also have n conditions to find those constants, e.g ...
2
votes
1answer
98 views

Variable number of controls in manipulate

i want to add a variable amount of variables to manipulate, but i got stuck at one point and can't figure out a solution (even after reading here for hours...). I have a function (e.g. here a ...
2
votes
0answers
205 views

Generalize WASD Function First Person Viewing

How might I generalize the following WASD question such that it works with any Graphics3D object and includes q and ...
2
votes
0answers
88 views

Compile issues, scoping and order of evaluation

I have a few questions about compiling functions, which I think are all related to scoping and order of evaluation. I will illustrate them by a minimal example of the problem I have. I'm sorry for ...
2
votes
3answers
126 views

Force change in aspect ratio of Inset image

I have an image that I want to place in the background of a plot and stretch it to cover the entire plot area. However, the aspect ratio of the image does not match the aspect ratio of the plot, and ...
2
votes
1answer
113 views

How can Mathematica help me to find a real radical expression for roots of this polynomial?‎

The polynomial P(x)=x^‎‏4‏‎-‎‏4‏x^‎‏2‏‎-‎‏2‏x+‎‏1‏‎ has ‎‏4‏‎ real roots (this can be clearly checked by plotting). But solving ...
2
votes
0answers
130 views

Power::infy: error using FindFit [closed]

I have a 2D data to fit (the Airy type pattern from diffraction of Gaussian beam on the circular aperture). Please see the attached picture. I was going to use a function like ...
2
votes
1answer
103 views

Multiple plots using dynamics

I am studying Dynamic and DynamicModule, and I have tried to make a simple plot of a family of real functions. The number of functions should be a dynamic variable controlled by a slider. So I have ...
2
votes
1answer
101 views

How to explain the behavior of Rule inside these functions [duplicate]

I'm trying to define a function that takes an expression and spits out a pure function involving a replacement rule of that function's variable. An example would be a function ...
2
votes
1answer
197 views

kernel Local crashes during the course of a For loop

I want to find the minimum of the function r[x,p] subject to the constraint w[x,p,t]==0 (t ...
2
votes
1answer
125 views

Plotting in projective space

I am having difficulty figuring out how to plot to projective space. Suppose I have a region which I have plotted such as: ...
2
votes
2answers
202 views

What is the proper way to operate on interpolating functions?

I am trying to multiply an interpolating function by -1. If I do this Mathematica does not seem to allow any further operations. Bear with me while I generate the Interpolating Function in question. ...
2
votes
1answer
215 views

GUI of a Karnaugh Map

I intend to implement a three-variables Karnaugh map with the following code. There are two points I failed to figure out. How to remove the outer double-line border? How to change the toggling into ...
2
votes
0answers
55 views

DSolve breaks when the ordering of independent variables aren't proper?

I encountered this when trying to solve this problem with DSolve: ...
2
votes
2answers
66 views

Order of Evaluate for Map

I would like to get a list of variable names as strings. For example, x = 1; y = 2; Map[SymbolName, Unevaluated /@ Unevaluated@{x, y}] {"x", "y"} This works ...
2
votes
0answers
92 views

Excluding region with `RegionDifference`

I can't make RegionDifference work for two Rectangle: ...
2
votes
1answer
146 views

How to draw timing diagram from a 0 and 1 string list (2)

I like ubpdqn's last edition & Mr Wizard's refactoring to my last question very much. I inserted two Reverse just to make the diagrams and the strings match in ...
2
votes
1answer
66 views

Having variables appear aqua in user defined function [duplicate]

In many of the inbuilt mathematica function, variables appear aqua like in: However, when creating your own function, variables no longer have that green coloring and are instead colored like an ...
2
votes
1answer
102 views

How does one get Mesh lines at 0 in ParametricPlot3D?

The following is in the documentation (MMA 10) under ParametricPlot3D -> Options -> Mesh : ...
2
votes
1answer
46 views

Is the use of Block to temporarily override definitions inherently unsafe? [duplicate]

This may have been discussed before, if so, please let me know. Consider the following example: x = 5 Dynamic[{Clock[], x}] This will always display the ...
2
votes
0answers
847 views

Mathematica 10 trial limitations [closed]

I just installed the mathematica 10 trial on OS X Mavericks. Everything seems to be working fine, except that I cannot use Export or any kind of functions involving ...
2
votes
3answers
169 views

How can I use NestWhileList instead of While in this case?

OK, the problem occurred when I challenged with Project Euler No. 10 The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below two million. My code is: ...

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