# All Questions

973 views

### Solving Integrals

Here's a problem that I don't understand. f[x_] := Exp[Cos[3*x]] g[x_] := (1/3)*x^3 - x^2 + 2 When I try to find the limit: ...
2k views

### RegionPlot3D in cylindrical or spherical coordinates?

RegionPlot3D is awesome. Unfortunately, it appears to work only for Cartesian coordinates. While there are ways to draw surfaces in spherical or cylindrical coordinates, I can't find a way to draw ...
3k views

### How can I convert a complex number into an exponent form

When I have an expression such as (1/4 + I/4) ((1 - 2 I) x + Sqrt[3] y) it is hard to get an intuition of the number. So I want to convert it to the complex ...
4k views

### How to draw a great circle on a sphere?

I apologize for the text description, but new users are not allowed to post images. I want to draw a circle that cuts through the center of a sphere and has an inclination of 15 degrees with the ...
104 views

### Different behaviour of ValueQ inside and outside of a loop

I need to store a rather big number of variables and I tried to do that by storing each variable as Z[n] with varying n. I guess this was not my best idea. The first problem I encountered is when I ...
677 views

I have a data file with triplets. The first two numbers indicate the x and y position, while the third one is the log10 value of a particular indicator. I want to create a 2D plot in which the ...
1k views

### How to prepare data for ListVectorPlot[]?

I was trying to plot a few velocity vectors measured at given points. However I am unable to do this with ListVectorPlot[] function. I get error each time I try to ...
736 views

### user defined functions, how to save them for future use?

I need certain user defined functions over and over. I was wondering how can I define and where and how to save them such that each time I start a notebook, these functions are available and need not ...
132 views

### How to make a pattern to change x^(2/y) to (x^2)^(1/y) for any x and y?

This might have been asked before. Please let me know if it is. I was looking at an interesting Mathematica question in students forum and trying to solve it, and a chance to learn more about ...
2k views

### Loops and subroutines [duplicate]

Possible Duplicate: Alternatives to procedural loops and iterating over lists in Mathematica I am new to Mathematica and not familiar with functional programming. In particular, I have no ...
460 views

### Tailoring RegionPlot3D with PlotPoints?

This seemingly tame solid gives Mathematica (v9) a bit of a workout if you want to generate a good picture: ...
1k views

### Sales forecast using SARIMAProcess and time-series data

I would like to ask for help in how to use the new Mathematica 9 time series functions to make some sales forecast. For example, for one of our stores, I have this data set with 35 points, from ...
102 views

### Why cant Mathematica solve this equation? [duplicate]

Possible Duplicate: Can Reduce *really* not solve for x here? Why cant Mathematica solve this equation? ...
937 views

### How to generate a picture like this?

How to generate a picture like this? I'd like the surface of the manifold to randomly distort.
660 views

### How to extract Solve results as variables [duplicate]

Possible Duplicate: Assign the results from a Solve to variable(s) In the following example: ...
2k views

### how to differentiate formally?

I have been wrapping my head around this for a while now and I have not found a solution so far. I want to work with an arbitrary number of variables in mathematica and use some built in functions. ...
277 views

### Iterative Function Mapping [duplicate]

Possible Duplicate: How to nest my own “times” function to get powers What I want to do is something like : Sin[...Sin[Sin[Sin[Sin[x]]]]] Basically, ...
112 views

### Draw from HistogramDistribution with ParallelTable

I wanted to check something, but ran into troubles using HistogramDistribution in combination with ParallelTable. The code does the following: Compute a HistogramDistribution of some sample and use ...
398 views

### Making the TableForm output into two columns

I have a program that calculates Christoffel symbols for a given metric, and the output I'm getting now is such that I have every calculated symbol in one column like this: I'd like that I could ...
172 views

### Subscript and Part: What's going on in this example?

Example I came across the following simple example from A Beginner's Guide to Mathematica, by McMahon and Topa, which I believe was written circa version 5.2. (FWIW, I'm using v9.) ...
3k views

### Remove annoying Conjugate

Here is an expression ...
72 views

### Extracting box coordinates [duplicate]

Possible Duplicate: Dimensions of the results of Text[] within Graphics[] In writing the following code, I had to figure out what values to give d by trial and error. Is there a way to ...
993 views

### How can I express an algebraic expression as a product?

I have a simply expression that I can see that I can express as a product. ...
224 views

### Symbolic calculation

Is there any software where this kind of symbolic calculation is possible? s = 0 for i = 1 to m j = 2 i + a - t if (j > 0) s = s + a I want s as a ...
284 views

### Evaluating a function on permutations of its arguments

Say I have a function "temp" of $n+1$ variables, $y,z1,z2,z3,...,zn$. I want to test if my function has certain symmetries like swapping $y$ with square of any $z$, swapping any two of the zs, ...
2k views

### Push-pin Art – Convert image to R-Y-B-W-Blk color space

After seeing an example of what is called “Push-pin Art”, I assumed that Mathematica would be able to handle the kind of image processing required to convert an image to this format. I am not well ...
177 views

### Write-protect documentation for self-written Add-on package

My package works fine so far, and now I want to add some documentation. I have put a file in ...
1k views

### Force Plot Area size to be equal excluding axes

I have two plots, both with the exact same formatting (frame, text style, etc.). One of them has 2-digit values for the y axes, the other has scientific notation because the value are large. In ...
345 views

### Bar chart labels disappear when PlotRange is used

I have used Placed[Before] to place labels on the labels before the bars, but when I specify a plot range, the labels disappear. I need a solution wherein I can use ...
3k views

### Is there a Mathematica equivalent to MATLAB's logspace? [duplicate]

Possible Duplicate: How can I get exactly 5 logarithmic divisions of an interval? I want to use Table to generate a list of items, but want the indices ...
408 views

### Lists of coefficients of derivatives

I want to extract two separate lists of coefficients of derivatives. If I have, for example, ...
191 views

I was using Needs["PlotLegends"] By chance I removed ShowLegend by Remove[ShowLegend] How do ...
292 views

### How do I simplify an embedded sub-expression without affecting other sub-expressions?

I have an expression which is very large and which has several sub-expressions with head Conjugate. What I want to do is simplify the ...
239 views

### How to solve this trigonometric system of equations numerically?

How can the following trigonometric system of equations be solved numerically? ...
204 views

### Syntax colouring when using Symbolize

I need to use symbols with suffixes in order to make my code readable in relation to the Eurocodes. To do this I use Symbolize from the ...
257 views

### Solve not satisfying simple boundary conditions

I am trying to solve the following equations for the coefficients c1 and c2. ...
412 views

### Possible bug in v9.0 Rest[] function

Bug introduced in 9.0 and fixed in 9.0.1 Just to be clear, this all works perfectly in v8.0.4.0. It only fails me in v9.0. I use 64-bit Linux, 64-bit versions of Mathematica, and I have 16GB of ...
311 views

### Export Voronoi Data?

I have a Voronoi Diagram (VoronoiDiagram/DiagramPlot) in Mathematica - and I need to export it to something I can import into ArcGIS. I'll settle for any sort of data/vector-based (non-raster) ...
378 views

### Sorting function for non commuting bosons

I am trying to write a sorting function which will sort expressions involving products of bosonic objects which do not commute. For example, I can have objects like $a,\ a^\dagger,\ b,\ b^\dagger$ ...
2k views

### Obtaining the Fourier transform of an operator

We know that if we have a function $f(x)$, and we call $g(\omega)$ its Fourier transform, then the Fourier transform of $x f(x)$ is $$\imath \frac{\mathrm{d} g(\omega))}{\mathrm{d}\omega}$$ and ...
251 views

### Why does a variable become real when using the second argument of Dynamic?

Version 9, on Windows 7. Please compare these 2 very simple examples Manipulate[ x, Row[{Manipulator[Dynamic[x], {0, 10, 1/100}]}], {{x, 1}, None} ] and ...
527 views

### RowReduce: Solving for the resource vector (a, b, c) in Augmented Matrix

Here are two examples: RowReduce[{{3, 1, a}, {2, 1, b}}] evaluates to {{1, 0, a - b}, {0, 1, -2 a + 3 b}} but ...
111 views

### Know the degree of the equation with the radicals expanded

I have an equation with radicals. I would like to know what would be the degree of the polynomials if I'd move the terms and square the equation a number of times sufficient to remove all the ...
4k views

### Why are PlotLegends not combined with Plots?

I'm using PlotLegends in v9. It seems that in the documentation examples, plots and legends are combined into one graphic: Here's an example from ...
95 views

### octopress plugin for CDF reader?

I am looking for a way to embed CDFs in octopress blogs. Looks like there are a lot of moving parts such as Jekyll, Liquid, and Pygments. I'd be grateful for a native trailguide through the jungle.
2k views

### Linear equation with complex numbers

I have to solve an equation of the type $$a z+b \overline{z}=c$$ with $a,b,c\in\mathbb{C}$. My approach is to set $F(z)=a z+b \overline{z}-c$ transform $z$ to $x+i y$ and then get a real linear ...
296 views

### Why does NSum fail here?

I want to evaluate a sum of integrals; each integral has a pole on the real axis and I handle this via the Cauchy Principal Value \$ ...
186 views

### How do I union graph properties?

I have two graphs ...