# All Questions

430 views

### How can I set different opacity values for the background of a ListPlot

In the following example: ListPlot[{1, 2, 3}, Background -> Green] how can I set the Opacity[] for the background such ...
213 views

### What's wrong with this code to create a matrix?

Here is my code: ...
564 views

### Sort matrix by columns and rows without changing them

I would like to sort a matrix in descending order first by the total of each column, then by the total of each row, but without changing their content. For example, if I had: ...
171 views

### How is OptionsPattern[] defined? Can I replicate this?

I am writing several functions which all take similar input parameters (a complicated nested list structure). Is there some way for me to define a pattern that can be used in multiple places and ...
507 views

### Replacements/Substitutions in Mathematica

I am a new user of Mathematica and have some questions about the simplifications of calculated expressions. I am unable to attach an image of the session, but my Mathematica commands are: ...
257 views

### Exported graphics texture to eps is too dark

Why is the exported graphics eps file so dark? It looks much lighter (and better) as the Mathematica output appearing the notebook. After running ...
720 views

### ColorFunction and/or ColorScaling issue with ParametricPlot3D

My goal is to use ColorFunction to color a cylinder based on the $z$ value of a separate Plot3D. I'm not sure if I am making a ...
237 views

### Reproducing Derive's plot of $1 - x^2 - y^2$ in Mathematica

In Derive 6, if I plot $1 - x^2 - y^2$, I get this: However in Mathematica 8 I get this: I'm using Plot3D[1 - x^2 - y^2,{x,-5,5},{y,-5,5}] What should I do ...
218 views

### Why can't I remove Orderless from Plus?

I am making some random algebra equations, and I want to have the ordering be random too, such that if my random equation generator makes x+1, the output stays ...
334 views

### Median marker style in BoxWhiskerChart

I was trying to adapt the BoxWhiskerChart to obtain a minimalistic quartile plot, like this: What I obtained is the plot below that is, however, unsatisfying; ...
432 views

### Numbering element in descending order

How can I numbering the elements in descending order of second elements of sublists? For example, if I have the list which is ...
857 views

### Can the CholeskyDecomposition function in Mathematica be made to work on non-symmetric matrices?

The CholeskyDecomposition[m] function in Mathematica requires a symmetric and positive definite matrix m. For instance, the ...
309 views

### command to expand quaternion multiplication

Is there are any command to expand quaternion multiplication as below STEP by STEP. Below is equation from my text. I'm self learner and for some reason I can't wrap my head around quaternion ...
339 views

### Why is an integer not considered as a real?

Please consider the following: zeros={0.,0}; data={1, 0., 0}; DeleteCases[data, #]&/@zeros Head/@zeros (*{Real, Integer}*) (*{{1, 0}, {1, 0.}}*) For my ...
332 views

### Probability: proportion of 1000 random lists for x that contain the same nrs

Give a function which calculates for each x a random list of birthdays (which can be x=1 to x=365) birthdays[x_] := RandomInteger[{1, 365}, x] is my answer. ...
328 views

### Creating sums of elements from a list

I have a list $(d_1, d_2, .. d_k)$ and I want to create all sums that I get for adding only two elements for my list $(d_1+d_2, d_1+d_3,...d_{k-1}+d_k)$. The ...
186 views

### Simulating CoordinatesToolOptions (for CDF) & the Inflexibility of MousePosition

I got two lists of equal lengths, which I show in two ListPlots, arranged in a Column or ...
267 views

### Build recursion in parallel?

Problem Let's define a simple recursion. f[1] = 1; f[n_] := f[n] = f[n - 1]*n; If I evaluate f in parallel ...
160 views

### How to get the boolean value of an inequality involving an InterpolatingFunction?

Here's the code: yan = FunctionInterpolation[x^2, {x, -1, 1}]; FullSimplify[yan[x] > -1, -1 < x < 1] Needless to say, what I expect to see in the output ...
448 views

### How do you properly create Buttons to change dynamic variables using Table

In this example, I want a series of four buttons to change the value of a variable that is used dynamically to drive a plot. I am trying to figure out why using Table around the buttons causes a ...
1k views

### Converting numbers to integers

I've read the available documentation but I still haven't found an NumberForm -> Integer function yet. No result in this site's search, either. Does it exist? ...
4k views

### Is it possible to substitute tick labels with alternative text? [duplicate]

Possible Duplicate: Labelling ArrayPlot Charts I am making a MatrixPlot. For example, consider the following: ...
2k views

### How do I keep the right ordering of eigenvalues using Eigensystem?

I'm having an issue with the Eigensystem command. I need to diagonalize a bunch of 3 by 3 complex valued matrices, but more importantly, I need to keep the exact ...
358 views

### Rendering polygon as graph with directed edges in Mathematica

In Mathematica I'm trying to render a polygon as a set of vertices and directed edges. What I have so far: ...
569 views

### Display position information out of ListPlots inside a Manipulate

I often have the situation where I'll use Manipulate[] to compare and examine 2 or more lists. A simplified example follows: ...
801 views

### Wavelet Packet Transform in Mathematica 7 and 8

For finding location of spikes in a time series I used to transform the data into wavelet space using DiscreteWaveletPacketTransform [ data, filter, 0] and then ...
382 views

### Equation solving with GroebnerBasis

I have a system of quadratic equations defined below ...
90 views

### SetOptions for CoordinatesToolOptions for DateListPlot?

DateListPlot does not respect my Options setting for CoordinatesToolOptions: ...
166 views

### Assumptions with patterns

I want that Mathematica assumes every symbol like Subscript[s,i] to be evaluate as a real and positive number. I have tried ...
135 views

### Unragging a matrix

Today I ran into matrices like this one: ...
86 views

### How can I get the style of a CellObject?

I want to work on a notebook programmatically with CellObjects. lets create a notebook for example: ...
149 views

### First digit difference between two numbers

I was trying to build a function that finds the first decimal place difference between two decimal numbers of same sign. An example: ...
63 views

### What are all the Properties that ColorData supports?

The documentation for ColorData reads: Possible properties in ColorData["scheme","property"] include: ...
378 views

### Real integral giving imaginary answer

Hello I am trying to evaluate the following integral Integrate[4279/Sqrt[0.6817 + 0.3183*(1 + x)^3], {x, 0, 20}] my mathematica 9 gives me ...
69 views

### Problem with Simplify, Sqrt, and Set: What's going on?

I am having some trouble getting Mathematica to simplify an expression of the form Sqrt[x]*Sqrt[1/x], where x>0. The problem is that x is assigned to some complicated form by the time Mathematica ...
78 views

### Join Two Element Meshes

Let's say I have two element meshes defined as the following: ...
154 views

### Why can't a Plot be rendered by Graphics if it's a member of a list?

I grabbed the code to render a gear from a Mathematica Demo, but I'm having difficulty reproducing the way it's to be used: ...
254 views

### Plot all curves in a table with a single color

I want all of my solutions in a table to be the same color. My attempt: ...
52 views

### Extraneous reaped data with NDSolve and WhenEvent

In exploring What is the range of values $x$ for which $f(x)$ is higher than $k$ over a given domain?, I came across the following strange behavior: ...
96 views

### Parsing string with nested information

I am trying to parse a string, but I have no idea how to solve the following problem ...
87 views

### How to set the output be generated in a cell different from “Output”

I would have some functions, for instance Plot, to generate their output using a different Cell's style rather than "Output". The reason is that I'm producing some documents with many images and, for ...
146 views

### ParametricPlot3D: The Mesh shows some unexpected wires to the origin. How to remove them?

In the code below a hexagonal shape is defined and plotted. The ParametricPlot3D shows the hexagonal design almost as intended. However, the mesh makes some strange "wires" to x=y=0. This is ...
127 views

### How to replace all symbols except several?

I'm doing some heavy symbolic calculations and for preliminary simple tests I need to replace all coefficients except chosen with 1, e.g.: ...
166 views

### Transform an InterpolatingFunction

I'd like to transform an InterpolatingFunction from NDSolve but can't figure out how. Here's an example. The equation I want to solve is ...
63 views

### The specified setting for the option FEFloatIterator cannot be used

I am currently trying to get a numerical simulation running where one variable is iterated over many orders of magnitude. As the calculation takes pretty long, I would like to display a ...
75 views

### How to keep first observation and delete other observations of each group in unbalanced Panel data

I have a huge panel data. I want to create a new data keeping only first observation of each group. How can I achieve it? For illustrative purpose; ...
205 views

### Plotting bug in Mathematica 9.0

I want to plot the transition dipole moment vectors on their respective position. For example one transition dipole moment have a position vector like R now at this ...
140 views

### Extracting columns from multidimensional list

Perhaps a very easy question but I posted this on the Wolfram Community and didn't get any answer.. Suppose I have data like: ...