# All Questions

189 views

### Mathematica 9's NDSolve treats sum as an integral [closed]

Sum and integral are threated the same by NDSolve in Mathematica 9: The problem was also in Mathematica 7. I submitted a bugreport to the technical support, they admitted this is a bug, fixed it in ...
408 views

### Special Mathematica Cell to work with R code

I have enjoyed working with R inside Mathematica. But it would be nice If I could have a special R cell. For example, instead of typing ...
193 views

### TemporalData frequency option as in R

I'm studying R, and am very impressed by the simplicity of some commands and in the way R handles temporal data. For example, in R, if you have some one-dimensional temporal data, you can easily ...
105 views

### Optimization problem—constraints not valid? [closed]

I have a model optimization problem: maximize rent, ri, through signals, si and sj, given ...
161 views

### How to rename a built-in function?

I want a built-in function renamed without loss of any properties, I want the shorter name to appear in all results and to be recognized as input. Is it possible?
122 views

### Solving a simple BVP

I'm new to mathematica and am interested in solving the following BVP: $\epsilon \,y'' + 2 y' + y^3 = 0$, for $0 < x < 1$ and $y(0) = 0, y(1) = 1/2$. I have no experience with coding, so ...
102 views

### Graphic Layers, Splitting Regions, Symmetry Operations to Font Characters

As Stephen Wolfram wrote in his lates blog post: A basic interactive system for generating logos is a tiny amount of Mathematica code. But getting everything exactly right turns out to be quite ...
250 views

### Drawing a torus not bounding a solid torus

I am trying to make a "pretty" picture of a torus in $\mathbb{R}^3$ which does not bound a solid torus. The standard way of constructing such a thing is to first take a non-trivial torus knot: ...
177 views

### How to efficiently fill in matrix values?

I would like to efficiently fill in or assign values to matrix m: m={ {a[1,1],a[1,2],a[1,3],a[1,4]}, {a[2,1],a[2,2],a[2,3],a[2,4]}, {a[3,1],a[3,2],a[3,3],a[3,4]}, ...
328 views

### Do you know of any web-based university course that is entirely Mathematica based?

Does anybody known of a web-based university course entirely built with Mathematica? I mean one where the whole course (lectures/labs/exams) is presented in Mathematica FrontEnd form. My point is ...
188 views

### Simple 3D graphic

How can I make a simple 3D graphic as in the following image? I know it is simply a sphere and a circle with several joining lines but I dont know how to make such simple one. I can use ...
61 views

### Obtaining Size Of Graphical Objects

I have created a panel, say Panel[""]. I want to know its size/dimensions. Is there any built-in function for doing that?
260 views

### PlotLegends doesn't work on Plot3D-V8.0.0

I am trying to plot in 3D and I need to use PlotLegend. My code is ...
145 views

### MatrixForm explanation as why row extract is displayed as a column?

I have a 5 x 5 matrix: cdsSpread5yrs = But after doing a row extract, why is it displaying as a column? ...
126 views

### How to add images where each represents a different color channel?

So I have three matrices that represent say the R, G, and B channels of an image: ...
128 views

### How to find the minimum of a function that is a sum of an analytical function and a series expansion?

I need to get a minimum of function F[ang] which is defined as a function of angle: ...
164 views

### How to pass arguments between functions

I have two Functions, f[] and g[]. f is passed some values ,say ...
156 views

### How to efficiently get the value from form UI built with dynamic InputField

Here is the code that I used to make a tabular UI. ...
130 views

### Mathematica returns fuzzy plot [closed]

I have a function that looks like this: likelihood[x_] = -Log[1/24*E^(-8*x)*x^11] However, when plotting this using ...
128 views

### Function with different set of arguments [duplicate]

Possible Duplicate: How to create functions of arbitrary number of variables? i want to use a Function f[] with different set of arguments. example: ...
265 views

### Mathematica 9 behavior with derivative of a sum

In: D[Sum[Sin[x],x],x] D[Sum[f[x],x],x] Out: 1/2 Cos[1/2 (-1 - Pi + 2 x)] Csc[1/2] 0 Function f is undefined, but Mathematica 9 counts it as constant? ...
778 views

### Is it possible to improve Mathematica's auto-completion feature?

In this answer Brett Champion describes how one can intercept and modify the suggestions used for auto-completion. Question: Is it possible to modify the suggestion for the automatic auto-completion ...
113 views

### Providing options to function [duplicate]

Possible Duplicate: Functions with Options I'm trying to write a Function With an option "Panel" which takes True or False as arguments. Based on Panel Value (True/False), different ...
133 views

### How can I remove unnecessary warning messages?

I updated Mathematica,CdfPlayer to new Version (9). I made a simple Application in Mathematica 9 and deployed into ...
150 views

### Unexpected result from Flatten

Consider the following three evaluations involving Flatten: Flatten[f[f[f[x, y], 1, 2], f[x, y]], Infinity, f] f[x, y, 1, ...
274 views

### Plotting a curve from the intersection points of a family of two curves

I have two state equations. f1 = 1000. (12 - (1 - u) x2); f2 = 1000. ((1 - u) x1 - 8/100 x2 ); I did two different stream plots for state-variables ...
195 views

### Problem with setting working precision in NIntegrate

I want to obtain a good numerical approximation (up to 10 decimal place would be ok for me) to an integral: $$\int^{\infty}_{0} f(r)r^2dr$$ I am using the function $f(r)$, which is related to the ...
89 views

### Finding integer partitions one at a time

I am writing a small program and I need to calculate integer partitions of a handful of numbers. In my code I just run IntegerPartitions[k,{n}] and then iterate through the results. Since I only use ...
132 views

### Evaluating a Recursive Expression

Why does this raise an error ...
37 views

### 3D spectrogram plots [duplicate]

Possible Duplicate: Computing and plotting a spectrogram in Mathematica I have a notebook that reads in some time-series data and calculates a spectrogram of it using Mathematica 9.0's ...
106 views

### How can we extend the predictive interface so it can suggest new operations?

Introduction Mathematica 9 has introduced a new predictive interface. For each output, it suggest possible actions the user might want to take. How can this interface be extended so that it will ...
388 views

### First positive root

Simple question but problem with NSolve. I need help how to extract first positive root? For example eq=-70.5 + 450.33 x^2 - 25 x^4; NSolve[eq== 0, x] If I ...
279 views

### Unit issues in Mathematica 9

I posted the following on the Google+ group comp.soft-sys.math.mathematica and had no luck with responses. I've done a Google search and, to the best of my ability, ...
97 views

### How to plot the sequence (n / (n-1)), 1<=n<=20 using ListPlot? [closed]

My last try was ListPlot[{n/(1 + n)}, {1, 20}]
390 views

### Is it possible to customize the Suggestions Bar?

I'd like to be able to customize the Suggestions Bar in v9.0 to provide recommendations of my own. Possible example: when doing unit calculations, I'd like it to suggest converting the answer to ...
114 views

### HorizontalGauge causes problem with ScalingFunctions -> “Log”

I am trying to use HorizontalGauge[Dynamic[expt], {0.1, 100}, ScalingFunctions -> "Log"], i.e. a gauge with a logarithmic scale. This creates an error, a graph ...
379 views

### Any built-in function to generate successive sublists from a list?

Given lst = {a, b, c, d} I'd like to generate {{a}, {a, b}, {a, b, c}, {a, b, c, d}} but using built-in functions only, ...
282 views

### Problem with boundary values for a partial differential equation

I have a PDE problem that I can't solve. and I wonder if you could help me with it. I have a Terzaghi Consolidation equation (similar to the heat equation) that is written as follows: ...
73 views

### ControlsRendering and operating systems

Controls, such as those appearing in Manipulate constructs, are by default rendered depending on the operating system. Wrapping everything in ...
72 views

### Why does “Pattern(1,0)[w,_]” show up in the resulting expression of a differentiation? [closed]

I would like to differentiate the function s, and be able to evaluate it for different w afterwards. I tried the following: ...
138 views

### Save notebook without including Front End version information

How can a notebook be saved without including the front end version? If you open a .nb file, you'll see something like ...
92 views

### Changing order of TeXForm output

I am creating Taylor polynomials and exporting them using TeXForm. When a polynomial p[x] is displayed in Mathematica, it shows, ...
455 views

### Does Mathematica have a built-in date picker?

Does Mathematica have an interactive date input control that lets the user choose a date by browsing to a calendar view and returning the selected date as a date list? For example, something like the ...
176 views

### Mathematica 9 fails to export graphics by right-click when notebook magnification is changed [closed]

When I try to export graphics as PNG, JPG and other rasterized formats using the right-click and choosing Save Graphic As..., if the notebook magnification is ...
524 views

### problem with coloring spherical harmonics

I want to color a spherical harmonics. So I write as follows. ...
394 views

### Deformed style when exporting eps files

I want to export a plot into an eps file. Below I present a sample plot code in order to demonstrate the two issues that appear. (1). LabelStyle: When I use ...
111 views

### Combining two lists [duplicate]

Possible Duplicate: How do I obtain an intersection of two or more list of lists conditioned on the first element of each sub-list? I would like to combine two lists. ...
151 views

### Catching only the first event in NDSolve EventLocator

I have a system of ODEs that I solve. During the integration process, there's an event that I want to catch, but I want to (a) continue the integration after the event and (b) catch only the first ...
I want to make a program where I have a collection of labeled vertices and edges between the vertices such that they join up with edges $a_{1} a_{2}, \; a_{2} a_{3}, \ldots ,\; a_{n} a_{1}$, so the ...