# All Questions

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### 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 ...
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### InverseFourierTransform of simple function takes forever

i'm quite new to Mathematica. I'm trying to do something along the lines of: ...
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### Coefficients of a polynomial in powers of 10

Can I express a polynomial function in Mathematica in power (ScientificForm) ? I was trying: ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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, ...
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### 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 ...
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### How to select a list from a list?

I have a list contains three vertices of a triangle. ...
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### 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 ...
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### import from Excel adds a point to each number …How to get rid of it?

I import an excel file ...
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### 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 ...
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### 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? ...
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### 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 ...
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### 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 ...
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### 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. ...
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### 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 ...
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### 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 ...
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### 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 ...
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### Compiling If statement

I have this code: ...
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### Method options for DensityPlot and ContourPlot

What Method options are allowed for DensityPlot and ContourPlot? I am unable to find this ...
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### 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, ...
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### 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 ...
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### Reading parameters from file and use them as parameter of a function [on hold]

Hi all: given the code ...
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### 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 ...
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. ...
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: ...
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 ...
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### Normalize centrality measures

How I can normalise centrality measures? Can I use Normalize function? I give example of unnormalized measures ...
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### 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 ...
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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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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. ...
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### Power[__] Pattern works like Level

I came across this case: ...
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### 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, ...
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### 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 ...
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### 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? ...
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### 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 ...
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### 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 ...
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### Ordinary Least Squares (OLS) with RLink

I need to calculate the parameters b0, b1 and b2 in: ...
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### 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 $z\in [0, \infty]$?
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### Unit conversion is not simplifying units

I'm running into what looks like an error. ...
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### 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 ...
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### 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 ...
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