# All Questions

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### Comparing two ways of fitting systems of ODEs to data

I'd like to ask you if you see any difference between the two following ways of estimating parameters. Given my system of ordinary differential equations that I want to use to find the values of all ...
7 views

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### Show error messages from collapsed sections

I've got a fairly long notebook. I like to have most of the sections collapsed. If I evaluate the entire notebook I don't see errors in the collapsed sections unless I expand them. I did see that I ...
18 views

### Maple vs. Mathematica

I am reading the document: "How Maple Compares to Mathematica" (http://www.maplesoft.com/products/maple/compare/HowMapleComparestoMathematica.pdf). On Page 15 is an example where mathematica produces ...
14 views

### Using Permutations to create numbers

I'm a high school math teacher working on a simple high school math problem involving permutations. I like to try to check answers to some of these problems since it helps "convince" the students ...
19 views

### Easiest way to parse semi-structured text file

I have a plain text file with some data. I need two things: Be able to extract certain values for the various field, e.g. to extract the 'Mean Dose [%]', that is to extract number ...
18 views

### Mathematica 8: EdgeList and CommunityStructureAssignment shadowing problem

I'm facing some issues when trying to use the CommunityStructureAssignment function from the GraphUtilities package in Mathematica 8. I'd like to output a ...
29 views

### Stability region of midpoint method using Solve and RegionPlot

I've been trying to obtain the stability region in the $(\lambda_R, i\lambda_I)$ plane of the midpoint rule $$y_{n+1}= y_{n-1}+2h\dot{y}_n,$$ for the model problem $\dot{y}=\lambda y$. The roots for ...
39 views

### How to establish a webservices call from Mathematica to NASA?

The procedure of establishing a webservices call is usually complicated and tedious. Could this be exceptional in Mathematica? For example, the most common way to search about the NGC 4038 or NGC 4039 ...
46 views

### An odd situation about numerical and analytic computation

I use Mathematica 10 and want to write the coordinates of the 120-cell's points into the set regular and then check whether the output of ...
34 views

### How to plot a “Circles-and-Squares Fractal”

The "Circles-and-Squares Fractal" is produced by iteration of the equation z_(n+1)=z_n^2 (mod m) which results in a Moiré-like pattern: Source: Wolfram ...
49 views

### Show command missing red dots from one of the function

I am facing an issue when trying to use Show command to show multiple graphs within one graph. Show command only shows red dot from one of the graph. ...
43 views

### How to produce a chasing-view in Mathematica?

I would like to chase the flying plane with a video camera, how to do that in Mathematica? ...
15 views

### Calculate distance base on value that is vary [migrated]

I am new to Mathematica. I am stuck at getting one specific value after calculating with value that is changing from 0.5 to 1.0 I have value 400 and from that I want to go to destination 720 using ...
77 views

### Ted's explanation for the 3rd argument of ListCorrelate doesn't apply to the {1, -1} case?

I was reading Ted Ersek's explanation for the usage of ListCorrelate(.nb version can be found here) and noticed something confusing. It's the third example of ...
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Consider the PISA study report, which contains dozens separate spreadsheets in each respective excel files (see http://www.oecd.org/pisa/keyfindings/pisa-2012-results-volume-iv.htm) Is there any way ...
14 views

### Can Manipulate steps be isolated to numbers from a set? [on hold]

Is it possible to isolate manipulate steps to a fixed set of numbers i.e. primes less than 20? I tried: nums = {0, 1, 3, 5, 7, 11, 15, 17, 19} returns I know ...
14 views

### do successive parallel computations require distribute definitions at each intermediate step?

Suppose I am doing a parallel computation, say, using parallel table. I distribute necessary definitions to all kernels. After computation is done, I would like to use the first result in another ...
19 views

### Iterator bounds error when defining function [on hold]

It's been a while since I've done any multi-line functions in Mathematica, so maybe I'm just missing something. I've created the following function, and I immediately get an Iterator bounds error when ...
33 views

### Custom SmoothHistogram3D

I decided to make my own SmoothHistogram3D function because I wanted to be able to specify my own bin sizes and not rely on their distribution functions so taking a cue from this answer and bringing ...
40 views

### What is going on here? (Wolfram|Alpha) [on hold]

When I alter the input by removing a space next to the x, I get a completely different result on Wolfram|Alpha -- why is this? ...
55 views

### How do I perform the following numerical integration

I have the following integral to evaluate numerically: $$x(t) = \frac{1}{f(t)}\int_0^{t_b} t^m (t + n)^o \sin(pt) \mathrm{d}t \quad m,n,o,p \in \mathbb{R}$$ ...
266 views

### Better way to test that a matrix is upper-triangular?

Today, I got to thinking about how to test that a matrix was upper-triangular. So I had a try at it. Algorithm $\quad \quad a_{ij}=0$ Or $i \leq j$ $\Rightarrow$ $True$ My solution is ...
27 views

### Bug? Side effects when exporting to .mx

I seem to have encountered a bug when exporting to .mx, at least on OS X. Can anyone reproduce this? I am on MMA 10, OS X 10.9.4. ...
51 views

### Why legendmarkers shifted a few pixels after opacity is specified

In below simple graph, if an opacity is specified in the legendmarkers, the plot marker shifted a little bit, can someone please shed some lights? ...
230 views

### How to create a table?

I have looked here at the forum and on the mathematica documentation center though still couldn't get it to work. I have two lists ...
48 views

### How to draw the trajectory of a moving particle

I want to draw a 3D graph showing a nanoparticle movements in liquid environment. Basically,the code is like the followings. I used Table to generate the position coordinates instead of using the ...
126 views

### One to Many Lists Merge

I have two lists: ...
62 views

### Export[] performance

Consider this sequence of commands: ...
35 views

### Defining a function that takes a function as a parameter [on hold]

I have a function like this CentralDifferentMethod[α_, β_, α1_, α2_, λ_, v0_, dt_, t_] Now, I want to add a new parameter ...
39 views

### Rearranging 5 equations

I am trying to rearrange 5 equations in terms of 5 variables. I have the equations for y1, y2, ...
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### How to draw multi curves in a graph with errorbars

The curves are composed by several 2*n nested lists. I want these curves be placed in a 3d way, like the xy plane is for the data, different curves are located in several parallel xy planes with ...
19 views

### Import file size capacity for Mathematica

I am trying to import a large data set (.csv) into Mathematica. The data set contains more than 14 million rows, is this something Mathematica can handle? If not, what is the maximum capacity? I have ...
53 views

### How to solve this equation?

Mathematica does not give me the correct solution (-1) for this equation: Solve[9^(x + 4) == 27^(1 - x), x] Do I miss something or is Solve the wrong approach ...
99 views

### Approximation to the prime counting function

Is there a function similar to PrimePi that gives approximate value for large numbers? In particular, I need a reasonably good approximation for $\pi(x)$, where ...
32 views

### Decompose the functions into partial fraction [on hold]

Decompose the functions into partial fractions f[x] = 2/x^2 - 2 x - 8 How to write partial fractions in Mathematica?
25 views

### Trigonomery problem [on hold]

I got a trigo problem I need to solve asap :p I've got a triangle, with no right angle. 1 of the side length is know, and the opposite angle is known too. I am spliting the triangle with a line ...
50 views

### How could I visualize a rotating cone within a sphere?

I am just learning Mathematica and as the title states here is what I want to achieve. How do I visualize a rotating cone within a sphere ? The length of my cone is governed by following equation. ...
35 views

### How can I restore the old ImageCompose behaviour?

Prior to version 10, if ImageCompose was used to overlay a partially transparent image region over a completely transparent image region, the result would keep the ...
34 views

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### Using HoldFirst but not wishing to hold everything

I have a DynamicModule in which I go through some data analysis and keep or reject the results. Here is a toy example of what I am doing. ...
27 views

### Dividing radicals (roots) [on hold]

I have this expression: √3 / √75-√27 Now do I simplify √75 and √27 into smaller forms, or is it sufficient to subtract 27 from 75 and then simplify 48?
201 views

### Short form of Graphics

Sometimes I want to investigate the structure of Graphics/Graphics3D which is produced by ...
24 views

I have a problem when uploading a demonstration for the WDP. Upload works fine, the demo does too but the snapshots do not behave. Particularly, the demonstration plots some curves generated by data ...