4
votes
2answers
122 views

ParallelTable with nonstandard iterator

This works as expected: Table[x[1], {x[1], 1, 10}] However, the parallel version ParallelTable[x[1], {x[1], 1, 10}] ...
1
vote
1answer
144 views

Feasibility of Linear Program

I have a set of (real) linear equations/inequalities and I want to know whether they have a solution, and to find at least one. The goal is to do this quickly. ...
1
vote
2answers
131 views

NumberForm in logarithmic plot (with LevelScheme package)

I am trying to plot some data using the LevelScheme package, but changing the logarithmic scale to display values in NumberForm ...
0
votes
1answer
142 views

Extract Positive Solutions in Logical Expand

I am using Mathematica version 7. I have an expression named fd and I took the derivative of fd with respect to ...
2
votes
1answer
62 views

Findings powers within strings - Cases function

Any idea which Cases statement will work for both A^2 and CA^4X^36 to find the powers? If I set sym to these two expressions, one requires a curly brackets around the first argument and the other ...
2
votes
3answers
288 views

Covariance of transformed random variables

I am trying to solve the following: $\begin{align*} &X \sim N(1,1)\\ &\mathrm{cov}(X, X^3) = \text{?} \end{align*}$ where $\mathrm{cov}$ is the covariance. How would you do this in ...
0
votes
1answer
84 views

order items of a table

I am trying to change order of a table. ...
0
votes
1answer
277 views

Combining Histogram and SmoothHistogram

How can we draw Histogram and SmoothHistogram together for two data sets?. I'd like to show the first data set using ...
3
votes
1answer
519 views

Monitoring the Evaluation of NDSolve: time to finish estimation

My problem is quite simple: I run a NDSolve with a system of many ODEs, a calculation that will run for many hours, and I would like to know the progress of the ...
1
vote
1answer
143 views

Corrected: Solve[] cannot solve simple hyperbola equations?

Is Solve[] very inefficient in solving equations involving square roots? The input below attempts to find out the explicit expression of either x or y in terms of other variables {x|y, a, c}, and c ...
1
vote
2answers
112 views

Select elements in a list when the firsts two items are the same (no matter order) and its third element is lower

I'm trying to solve a heuristic search in Mathematica 9. I get a list of succesor nodes called open with two nodes and a heuristic value, e.g., ...
1
vote
1answer
134 views

wordpress wolframCDF plugin 2.0 stopped working

setup and tried a simple CDF document and it worked like a charm. That was a couple of months ago - now the post does not show evidence that the shortcode is working at all - the shortcode is in the ...
-1
votes
2answers
264 views

How do I generate a table of data points from a function and add random noise? [duplicate]

I am trying to generate a table of data for the function: ...
1
vote
1answer
90 views

Expand list of {{t1,x1},…} with new set of t's

I have a list of the form data={{t1,x1}, {t2,x2},...} and a list newt = {nt1,nt2,...} and I want to expand ...
4
votes
3answers
154 views

Maintaining map dimensions after using Colorize

I am trying to beautify a map by using Colorize as demonstrated in the Mathematica documentation. First, I import a shapefile from DIVA-GIS for France which ...
2
votes
0answers
48 views

Verifying integration by parts of an arbitrary function [duplicate]

Suppose that I have an arbitrary differentiable function $G$ which depends on $s$: $G(s)$. Now suppose that I want to do the following integral: $$\int ds \;\; s \frac{\partial G(s)}{\partial s}.$$ ...
1
vote
1answer
214 views

Comparative Statics on Mathematica

Let me first explain what I am doing then I will mention my little problem that I could not figure out. I am using Mathematica version 7. I have an equation named "fd" and I took the derivative of ...
0
votes
2answers
368 views

Combining Graphics & ContourPlot using Show

I was recently experimenting in Mathematica and was combining graphics and a contour plot and discovered the order of elements in show matters. Why would the order matter here? ...
2
votes
2answers
331 views
0
votes
1answer
212 views

ListVectorPlot3D

I try to plot a 3D Vector plot. All Vectors start at (0,0,0) and point in directions given in spherical coordinates: ...
0
votes
2answers
209 views

Most efficient way to sum over matrix products?

I have two lists. The first, coefficientlist, is dense and has dimension {176,176} elements. The second, ...
7
votes
1answer
668 views

Determining which rule NIntegrate selects automatically

I need to numerically integrate a highly oscillatory function over the semi-infinite domain $(0,\infty)$: $$\int_0^\infty \frac{\sin^2(x) \sin^2(1000 x)}{x^{5/2}}\mathrm dx$$ Since the Levin rule ...
0
votes
1answer
154 views

Problem with importing format of data from Excel?

I am trying to import data from Excel. It is located in a single column of the Excel file but each cell contains a comma separated pair of two values as a,b. When I am importing them I have this ...
3
votes
2answers
146 views

Mouse cursor very slight difference

Mathematica uses a very thin, translucent cursor in Input style cells. But in text style cells Mathematica uses a cursor theme from Windows. How do I make the cursor visible as normal? photos of ...
2
votes
1answer
293 views

How to get (fg)' = f'g + g'f?

I am new to Mathematica so the my questions might be pretty much at the pupil's level. If I want to use differentiation to derive: (fg)' = f'g + g'f How can ...
0
votes
2answers
2k views

KeyPress function in Java's Robot class, how to state parameter?

I am trying to use Java's Robot class to type. This is what I have done so far. Needs["JLink`"]; InstallJava[]; robot = JavaNew["java.awt.Robot"] The mouseMove ...
6
votes
2answers
145 views

Large Number times Tiny Number

A (maybe noob) question: Let a = 1234567891234567889998.5 b = 1234567891234567889999.5 Mathematica (v8) yields for ...
2
votes
2answers
186 views

Restarting an Animate animation after variable in Manipulate changes

I've been trying to restart an animation after variables change from Manipulate PopUpMenus. My animation takes the form: ...
2
votes
3answers
270 views

Introduction of straight Line into Manipulate function

I just want to implement a line within my chart that starts from time point 0 to time point T and whose y-coordinates can be manipulated, which in my case is represented by D. I tried to implement a ...
1
vote
1answer
141 views

Searching a string that may contain Null

I have an array of triplets that can be approximated by the following code: ...
1
vote
2answers
155 views

How to maintain a smooth surface in CDFs while playing? [duplicate]

I created a CDF for viewing the Möbius Band, and its generation. https://www.dropbox.com/s/e3af0xelbbqjfhd/Cinta_Moebious_Rafa.cdf But: 1.- When it´s PAUSED the surface is soft and you can see with ...
6
votes
1answer
213 views

Match sequence of zero or more characters except a given character

This looks like it should be simple: I want to match an "i" followed by an "o" with an arbitrary (possibly zero-length) sequence of characters in between, unless that sequence also contains an "i". ...
2
votes
1answer
190 views

Exporting HTML code to file.html

I've got a problem with re-saving html code. Lets create html file: ...
1
vote
3answers
496 views

Plotting 2D image of functions of several variables

I have a function $f: \mathbb{R}^4 \to \mathbb{R}^2$, and I would like to plot the region $f([0,1]^4)$. Writing $f_1(s,t,u,v)$ and $f_2(s,t,u,v)$ for each coordinate of the output I tried using ...
1
vote
1answer
97 views

Cannot Plot Output of Solve

I'm trying to plot the output of the following function t2[x_] in ...
3
votes
1answer
666 views

Quality control when exporting graphics into JPG

If I export a graphics from Mathematica to JPG format the image quality in JPG is visibly lower than that in Mathematica. Is it possible to control and eventually increase the quality of the exported ...
0
votes
0answers
174 views

Function not recognized by Mathematica?

I'm trying to do triple integration on a bivariate function where one of the upper integration limits is the variable of the outer-most integration. When I execute the following lines, Mathematica ...
10
votes
4answers
1k views

How do I find the coordinates of points in this image?

I have never used image processing with Mathematica. I need to get the coordinates of the red points from this image I made in Illustrator. Is there a way to get Mathematica to read or detect the ...
0
votes
0answers
113 views

How to add something like a shadow to my resulting figure? [duplicate]

after plotting this function: ...
2
votes
1answer
81 views

How to specify optional arguments that take functional values

I am trying to make a function with an optional argument that may change but mathematica caches the value when the function is defined. Here is an example where the optional time variable is set when ...
17
votes
1answer
439 views

3D bubble textures in Bread (and other solids)

Bread has a bubbly texture that I would like to be able to recreate using Mathematica. Here are some examples of bubble textures: Bread Swiss cheese Foam Note that most of the ...
0
votes
1answer
610 views

Plot and Histogram together in Mathematica 7

I want to draw a histogram and some line plots together. I have one observed variable and several predicted ones. Observed data should be shown as a histogram and the predicted variables should be ...
2
votes
2answers
197 views

Using BarChart and pastel colors is there a method to get the labels to be the same color as the bar?

I am using version 8 and I have the following code: ...
2
votes
2answers
179 views

Stochastic problem

I have to organize a small sports league and I am puzzled on how to create the game plan. We are 8 persons playing table soccer with 2 vs. 2 matches. The idea is that each person plays once with ...
2
votes
0answers
125 views

correct usage of ParallelTable

I am trying to parallelize my script. Here is a MWE of how I have done it: ...
20
votes
5answers
4k views

How to perform a multi-peak fitting?

I am wondering how to implement the multi-peak detecting and fitting in Mathematica. Following is an example of fitting the data using three peaks (such that the data ~ peak1 + peak2 + peak3). The ...
1
vote
1answer
99 views

How do I change the Head of Graph into List?

I am trying to change the Head of b (a NeighborhoodGraph) from Graph into List but Apply seems to fail. I start with a list of connected vertices: ...
0
votes
1answer
81 views

Sublist inside simple list

I have a doubt to confirm. Let there is a list f = {{l}, {c}, {d}, {e}, {1, 2, 3}, {3, 4, 5}} And I expect it to be traversed as a normal list which I can do ...
0
votes
1answer
147 views

Using Sort vs SortBy

So I have two lists, A and B. I put them into lists = {A,B}I want to sort A such that Im[#1]<Im[#2]& which I can do fine ...
4
votes
2answers
99 views

Specific rearrangement of elements in list

I have an $n\times n$ matrix G with elements g[i,j] that I construct with ...

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