0
votes
0answers
12 views

version 5 & OS X 10.9

Can I use V. 5 mathematica on my MacBook Air with OS X 10.9?I have this old version of Mathematica which I bought when I was using OS X 10.4. I cannot now afford to upgrade to V. 10. I have not ...
0
votes
0answers
22 views

InverseFourierTransform of simple function takes forever

i'm quite new to Mathematica. I'm trying to do something along the lines of: ...
0
votes
0answers
18 views

Coefficients of a polynomial in powers of 10

Can I express a polynomial function in Mathematica in power (ScientificForm) ? I was trying: ...
0
votes
0answers
14 views

Return the incomming expression on false

when I have an expression, that is unknown to mathematica, it is returned exactly the same, as it was called. For example SeeFlyingPigs[1,2] called on the line ...
0
votes
0answers
20 views

RegionPlot of NDSolve solution

I am trying to make use of RegionPlot to plot the numerical solution obtained via NDSolve. I have seven coupled equations(RG equation) where I want to vary the initial condition for ...
2
votes
3answers
35 views

Find Unconnected Subregions

If I have a region, how can I identify sub regions that may be disconnected, if any exist? region defines a rectangular region given two diagonally opposed ...
-1
votes
0answers
24 views

solving singular matrix

Hello I have a matrix that is singular, and i wanted to use linear solve to solve it but that doesn't work with mathematica. The matrix given as a list looks like this: matrix={{-4.41583, 0.203293, ...
0
votes
0answers
21 views

parsed matrix not deleting elements in adjusted matrix

I have a matrix that has been parsed to delete certain rows and columns, as well as delete certain elements on the diagonal on the matrix. The problem is that it does this in theory when i take the ...
0
votes
1answer
29 views

How to select a list from a list?

I have a list contains three vertices of a triangle. ...
1
vote
1answer
25 views

Prevent Simplify from using cot

I have the following problem. I got a huge equation to simplify and in there are numerous $\cos(x)$ and $\sin(x)$ terms and now it happens that Simplify changes terms like $(...+\cos(x)*a+...)$ to ...
0
votes
1answer
22 views
0
votes
1answer
40 views

Get rid of Error Function: How to get rid of sequential appearances of error function?

We have a function as e[t_] :=(E^(-t^2)) Cos[0.1 t] and we must evaluate below integration (However I used the variable x ...
1
vote
1answer
32 views

BSplineSurface problem

Why does the result of this function is straight line.If problem is in the order of my points, what order is correct? ...
0
votes
0answers
37 views

Find $\phi$ as function of $\theta$ for Villarceau circle in a torus

May I request for your indulgence, to enable Villarceau circles visualization made by the tip of a line rotating inside a circular torus if possible based on unification of parameters. Villarceau ...
3
votes
1answer
99 views

Write Integer powers as products

I need to wirte all occasions of (a+b)^3,Ftp^2, Sin[th]^2, ...etc as (a+b)*(a+b)*(a+b), Ftp*Ftp, Sin[th]*Sin[th], ...etc ...
0
votes
0answers
34 views

Help to numerically solve ODE

http://math.stackexchange.com/questions/912076/time-period-of-ode Trying to numerically compute the time period of an oscillation as suggested by Robert Israel, to check it with direct plot. ...
0
votes
0answers
19 views

Using assumptions when calling Simplify from Collect

I am quite new to Mathematica, so please be patient ;) I have a very long equation that I have to sort for powers of a variable called e and that I want to ...
-3
votes
0answers
51 views

Polar Plot Confusion [on hold]

Make a Manipulate that places a green point on the rose r=a+Sin[θ] at the point {r[t] Cos[t],r [t]Sin[t]}. You do this by using ...
1
vote
1answer
61 views

MathematicaPolarPlot Question [on hold]

Using this as an example PolarPlot[{1,Sin[3 θ]},{θ, 0, 2 π}] Now consider the family of polar curves r=a+Sin[3 θ] as we vary ...
1
vote
1answer
44 views

Compiling If statement

I have this code: ...
5
votes
1answer
56 views

Method options for DensityPlot and ContourPlot

What Method options are allowed for DensityPlot and ContourPlot? I am unable to find this ...
2
votes
0answers
26 views

Background color does not display in InputField unless Appearance option is also specified

I get the same behavior for v.10.0.2 and v.9 with OS X (10.9.5) : No background color is displayed in InputField if I just set properly the option. For example, ...
0
votes
1answer
92 views

How do I plot results of complicated calculations in Mathematica?

I am new to Mathematica and am struggling with making plots of how features of solutions vary with parameters. For example, I can find the eigenvalues and zeroes of a Sturm Liouville problem (showing ...
5
votes
1answer
70 views

Time Series Analysis - How does it Difference?

In languages other than Mathematica (especially R) if you want to do any time series analysis, you must always difference the series according to some feature of the series in order to satisfy at ...
0
votes
1answer
49 views

Unable to Discretize a Region

I'm trying to compue a mesh of full 2D region delimited by the a circle transformed with a Complex map. ...
1
vote
1answer
58 views

(Tree) Graph Layout

I am trying to draw a graph in a tree-like form. I can't use TreeGraph because what I am drawing is not properly a tree (has loops) so TreeGraph won't draw it. Here is the code: ...
2
votes
1answer
136 views

How can I improve ContourPlot to get smooth curve?

I am working on the ContourPlot to creat contour line of a InterpolatingFunction recently. This is my data. This is my simple ...
0
votes
1answer
44 views

Normalize centrality measures

How I can normalise centrality measures? Can I use Normalize function? I give example of unnormalized measures ...
4
votes
0answers
97 views

Can I define an axiomatic (Boolean algebra) system and prove theorems using Mathematica?

The general question is Can I define an axiomatic system and prove theorems using Mathematica? The more concrete one is about Boolean algebra. I consider this axiomatic Boolean algebra system ...
3
votes
2answers
64 views

Headings, subheadings, text cells etc and Alt+n

This is a minor point but annoying. I have just upgraded to version 10.0.2.0 and discovered that you must select a bracket before doing Alt+1, or Alt +7 to make a cell a heading or text cell. This was ...
0
votes
0answers
56 views

How to export a vector of vectors (Mathematica 8)? [on hold]

I would like to export the object type: { {{"a", "n", "y"}, {"a", "s", "k"}}, {{"b", "y"}}, {{"d", "a", "t", "e"}, {"d", "a", "y"}, {"d", "r", "y"}} } and then ...
1
vote
0answers
30 views

How can I define a metric in xAct?

I'm using "xAct" package and I want to define a my metric, that is a non standard metric. For example, my metric is diagonal ...
6
votes
3answers
191 views

Plot of Implicit Equations

I've read Cool Graphs of Implicit Equations recently. In the article, it mentioned a software GrafEq which can draw graphs of arbitrary implicit equations. For example, And I've tried several ...
6
votes
1answer
55 views

Fitting higher order ARIMA models hangs, never completes

I'm working with some data that is 12 month seasonal. However, when I try to fit it to an ARIMA(12,1,3) for instance, my PC's CPU cranks up to 100% and the job never finishes. Here's some sample code. ...
3
votes
2answers
73 views

Power[__] Pattern works like Level

I came across this case: ...
2
votes
0answers
24 views

Remote Kernel configuration works in v9 but not in v10

I have both v9 and v10 currently installed on my computer (Windows 7). For reasons that are not entirely clear, if I create a new remote kernel in one version, it is accessible to the other; however, ...
2
votes
1answer
81 views

How to check if Integrate solved the integral?

This seems something that must have been asked before, but I am not able to find something. Integrate does not return status nor throw error when it can't find antiderivative. It just returns the ...
1
vote
0answers
46 views

What are the differences between these functions when used for NMaximize?

In short, the question is how to construct the function you want to optimize? ...
12
votes
3answers
966 views

Buying a new computer (specifically for Mathematica)

My current computer is a MacBook Air, the mid-2011 version: 4 GB RAM, 1.7 GHz Intel dual core. It runs Mathematica 9 smoothly, but a bit too slowly for my taste. I use Mathematica almost exclusively ...
1
vote
1answer
52 views

Shifting Columns in an Array Efficiently

I am trying to find a more efficient way to shift the columns of the partitions of an array according to a defined slope and fill in the shifted regions with zeros I have done it below but, I know it ...
3
votes
1answer
37 views

Ordinary Least Squares (OLS) with RLink

I need to calculate the parameters b0, b1 and b2 in: ...
-2
votes
2answers
36 views

Inverse of function including hyperbolic cotangent [on hold]

How can I create a numeric function for the inverse of $y(z) =\coth{z}-\frac{1}{z}$, over the range of $y\in [0, 1]$ and $z\in [0, \infty]$?
0
votes
1answer
40 views

Unit conversion is not simplifying units

I'm running into what looks like an error. ...
3
votes
1answer
33 views

Multicolumn sorting with ordering functions and precedence

I am aware that the question of "how do I sort on a column" has been asked in various forms, most notably this one. While some powerful solutions have been presented, as far as I can find no one ...
0
votes
0answers
53 views

How to define a two-variable sequence?

I would like to define the following function but I am having a problem. I would like Mathematica to "understand" what I mean by writing "+...+". For example, for large values for $n$ and $m$ it takes ...
3
votes
1answer
101 views

How to execute a notebook in background

I am developing an algorithm that take time to return results. I thought if I could run this notebook in background and continue to develop the rest of my work. It is possible to do that?
4
votes
0answers
49 views

How to execute code on FrontEnd quit?

I would like to execute a block of code whenever the FrontEnd quits. I know about $Epilog, but it seems that this would execute every time the kernel quits, which is not what I want. Does anyone know ...

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