4
votes
3answers
373 views

Why the difference?

When I do the double sum using the sigma notation I get $$1 + \sum_{n=0}^{\infty}\sum_{k = n}^{\infty} \frac{1}{(k+2)k!}$$ $1 + e - \cosh[1]$ When I do the sums as below, I get the expected ...
1
vote
1answer
430 views

Why can't my new installation of Mathematica 9.0.1 find sysinit.m

I have just installed Mathematica 9.0 in a x64 openSUSE 12.3 machine using sh Mathematica_9.0.1_LINUX.sh as superuser. I have had Mathematica 8.04 working on the ...
5
votes
0answers
823 views

MathKernel.exe capped to use only 13% of CPU?

I am using a Windows machine with 8 cores. No other process than Mathematica 8 is using CPU time right now - still the MathKernel.exe CPU usage does not go beyond 13%. My current computation takes ...
7
votes
3answers
429 views

Combining Image3D and Graphics3D

I want to combine an Image3D and a Graphics3D using Show. Here is the code: ...
3
votes
0answers
305 views

Cannot save file

Hello I have a problem in saving files in Mathematica. I can't save not only notebooks but also figures. When I choose to save the notebook it open a window that says: Mathematica could not find ...
4
votes
5answers
1k views

Get Coordinates in Image Processing

I'm new to Mathematica. I'm very impressed about it's abilities. It's very easy to achieve complex tasks. But I fail the simple ones. How can I get coordinates in image processing? I'd like to ...
9
votes
2answers
601 views

Customize your FrameTicks in a MATLAB way

The figure below is made by MATLAB. However, the scientific form of numbers in FrameTicks that how MATLAB deals with is quite different from that of Mathematica. ...
3
votes
1answer
200 views

How to make the plot from geotiff format

I have a "GeoTIFF" format map, and I have imported it into Mathematica, then I used the Graphics to plot a point on the map. ...
5
votes
1answer
435 views

Montgomery Modular Exponentiation

I'm trying to write a Montgomery exponentiation based on this which can compete with Mathematica PowerMod. We know that PowerMod ...
7
votes
3answers
286 views

Linking points in separate lists in ListPlot (updated)

Updated: I have two lists (of different lengths) of co-ordinates, in the form {x,y,"tag"}, that I wish to plot so that one list is graphically linked to the other ...
2
votes
1answer
290 views

Passing an iterator [duplicate]

The code Table[i, {i, 5}] produces the output {1, 2, 3, 4, 5} whereas the code ...
0
votes
1answer
109 views

Can I force a function to quit and return some value after a certain amount of time has passed during its evaluation?

Imagine I provide some random input to function like FindInstance[], and I observe that, despite the existence of good solutions, the function will, with some ...
2
votes
1answer
176 views

Using NetLink to Import Excel File

I can import an Excel file into Mathematica easily: But when I try from .Net it fails: These are the commands and errors I am getting: ...
1
vote
1answer
287 views

3d plot for function defined for integer values

I would like to make a plot of a function defined just for integer values, like f[n_, m_] := 2 - (1/IntegerPart[n]) - (1/IntegerPart[m]) If I try to plot ...
1
vote
2answers
1k views

How to take conjugate of a function?

Naïvely this is what happens and it obviously is not helpful! ...
0
votes
1answer
938 views

How do I define the domain of a function?

I have a function of two variables, f[x_, y_], and I would like to restrict the domain to values of x and ...
4
votes
1answer
190 views

Manipulate a Plot that contains a variable that contains symbol [duplicate]

This snippet mm = m Manipulate[{mm, Plot[mm x, {x, 0, 1}]}, {m, 0, 1}] (m is not defined anywhere) produces a sadly fixed ...
1
vote
1answer
181 views

How does FindShortestTour work?

How are FindShortestTour and the algorithms therewithin implemented internally? Also: Can I access some form of incremental, in-progress result during evaluation? ...
1
vote
1answer
267 views

Arbitrary depth patterns/rules

Temporary message: I am now really confused. I am not sure how using Power and Unevaluated together works in the examples below. While answering this question, I stumbled upon the following. We ...
1
vote
1answer
57 views

How to change Compiled->False to Method->{Compiled->False} in multiple notebooks?

I have a collection of about 40 notebooks where the options for ParametricPlot and ParametricPlot3D have: Compiled->False and I need to switch any/all ...
1
vote
1answer
174 views

How do I create a graph with randomly directed edges starting from a undirected graph?

I have an undirected graph $G$. How would I randomly assign directions to some fraction $p$ of the edges? How might I do this efficiently / quickly provided I have a large graph structure? For ...
1
vote
1answer
289 views

Solving Intervals

In a recent question I posed, it was noted that by design, Sqrt[ blah] only returns the positive branch, even though we might want to obtain all possible symbolic solutions. So, taking care to avoid ...
6
votes
1answer
144 views

Why is FindInstance failing when I relax a set of constraints?

I'm attempting to use FindInstance to generate coordinate sets for plausible triangles with edge length distance constraints. E.g.: ...
4
votes
1answer
432 views

How to solve this equation with integers as a solution?

I want to solve the equation $$x^y + y = y^x + x$$ with $x$, $y$ are integer numbers. I tried Solve[x^y + y == y^x + x, {x, y}, Integers] How to solve the ...
7
votes
0answers
105 views

Apart may use Padé method: what's that?

How does Apart work? The page tutorial/SomeNotesOnInternalImplementation#7441 says, "Apart ...
1
vote
3answers
457 views

Sqrt — how to get negative branch?

One of the many attractions of Mathematica is that integers are generally treated as exact symbolic entities, and not just as numbers. I was just playing with Sqrt, and was puzzled by what appeared to ...
0
votes
0answers
244 views

DSolve::overdet for system of linear PDEs

I would like to resolve symbolically the following equation: ...
0
votes
2answers
266 views

How to specify VertexCoordinates as geographic coordinates of cities?

I have been very busy these days with giving the VertexCoordinates of the cities the geographic coordinates from ...
5
votes
1answer
392 views

nested use of Apply/Map/MapThread in pure functions

1. My main question I have a function with two argument slots. I wan't to apply this function to 2 lists with different length's. I thought in this solution: ...
1
vote
1answer
132 views

Table/Tree of values

My question: Is there a way to create a tree of values? Something like the output of the command TreeForm, but with values in the nodes? Why do I want this? I'm trying to do a complete program to ...
0
votes
2answers
71 views

Implementation of a condition in a Function

I have defined that stoptime {5, 2, 10, 2, 1, 11, 11, 1, 5, 11} and have the following function pvcosts = (-5/1.05^#) &[stoptime] Now I want that everytime "stoptime" is 11, the function gets ...
2
votes
0answers
64 views

How can I install a new stylesheet in CDF Player?

I've created my own stylesheet and I would like to install it in the CDF 9 directory, so when I apply it to a new Mathematica notebook and save it as CDF file, it will show it correctly. I used this ...
0
votes
2answers
273 views

Problems with NDSolve and stiffness

I am trying to solve an ODE in chemical kinetics: $$\begin{align*} \frac{\mathrm d[x]}{\mathrm dt} &= -k_1 [x][y]\\ \frac{\mathrm d[y]}{\mathrm dt} &= k_1 [x][y] - k_3[y] \end{align*}$$ My ...
0
votes
1answer
114 views

How to import sound file from computer? [duplicate]

I know you can import sounds/images from the Mathematica library, but I was wondering if I could import sounds I have on my computer (i.e. .wav files)? I've tried using the Import functon and properly ...
1
vote
1answer
168 views

Why is a non-convergent series simplified to zero?

Sum[Sin[n*x]*Sin[n] /. x -> 1, {n, 1, Infinity}] == Sum[Sin[n*x]*Sin[n], {n, 1, Infinity}] /. x -> 1 Sum::div: Sum does not converge. >> ...
1
vote
1answer
563 views

NIntegrate fails while Integrate works

I have a function $f(t)$ defined as $f(t)=\int\limits_0^t(t-\xi)^{\alpha-1}\ \cos(\xi)\ d\xi$ where $0<\alpha<1$. I now want to evaluate this integral at various values of time. Therefore, my ...
8
votes
4answers
217 views
2
votes
1answer
130 views

How to get a list of 3-connected graphs?

I'd like to use GraphData to get a list of graphs with vertex connectivity at least 3. I know GraphData["Nonplanar", 6] gives ...
2
votes
1answer
98 views

What is the best way to save a large graph object, allowing it to be reloaded quickly in a new kernel?

I generated a very large graph, too large to simply display and manipulate with copy/paste operations. How can I somehow save the graph to a file to allow it to be rapidly reloaded after I quit out ...
5
votes
5answers
1k views

How to sum over a List

list = {11.5575, 11.397, 5.52734, 4.0878, 2.54815, 1.86652, 2.55028, 2.14952, 1.6242, 1.34117} I have a list of numbers. How do I make a function that creates a ...
0
votes
1answer
254 views

Using undefined function in an expression

I want to use undefined functions in expressions to be simplified. For example. I want mathematica to simplify this input $(f^{\prime\prime}(t),g^{\prime\prime}(t))\cdot (-g^\prime(t),f^\prime(t)) $ ...
5
votes
1answer
151 views

Why do vertex labels disappear when I edit with drawing tools?

I'm trying to change the text and arrow style in GraphPlot using the drawing tool, but the the vertex labels disappear when I do that: ...
2
votes
1answer
135 views

double arrow in GraphPlot

Is it possible to combine two edges into one with a double arrow? For example: ...
1
vote
1answer
761 views

3D plot of two 2D functions

I would like to plot two 2d functions in a 3d coordinate system. Examples are z = x^2 and z = y^2. Each function has one ...
4
votes
2answers
990 views

How to make traditional output for derivatives

Hello again after some pause. i have a problem how to present partial derivatives in traditional form, not as Mathematica gave it to me in its notation. So I want to present this ...
1
vote
1answer
100 views

Contour3Dplot more graphs in one picture [duplicate]

How can I plot two equations in one 3D graph. I have to plot x^2+y^2=1 and x^2+y^2+z^2=2 but I want tu plot only their intersection :( Thank you
5
votes
2answers
291 views

Using RSolve correctly

I am having problems persuading Mathematica to solve even the simplest recurrence relations. As an example, how would you do the following? ...
1
vote
2answers
105 views

How to set the background of a section to light gray?

How to set the background of a section to light gray and leave background of content below and above the section as default?
4
votes
1answer
413 views

Calculating pleasant colors for source code or web-design

I really like when the programs or editors I use have pleasant colors. Sometimes when there's nothing else to do or sometimes when there are very important, but incredibly boring things to do, I find ...
4
votes
0answers
199 views

Can I get access to Amazon's AWS API within Mathematica?

Has anyone tried access Amazon AWS API from Mathematica, I'm assuming the HTTP WebService module of Mathematica would be a starting point. Any suggestions on getting started would be welcome.

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