# All Questions

16 views

### How does Mathematica calculate the nth prime?

When I enter Prime[2000000000000], the two-trillionth prime, Mathematica gives 61427839512211 for the answer after several ...
11 views

### Efficient way to substitute and plot

The quatity $R$ is defined by a complicated expression in terms of $a_1,a_2,\ldots,a_n$. Now each $a_i$ is a function of $x$, $a_i(x)$. I would like to know what is the most efficient way to ...
29 views

### A simple ListPlot with different colours and a Tooltip

I know that the threads ListPlot with each point a different color and a legend bar" and "Extracting the coordinate of a particular point of interest from a ...
30 views

### how to set initial conditions when solving recursive equation with tables

I am solving a recursive expression with ParallelTable. Here is a MWE showing how I do it, and how I set the initial condition: ...
31 views

### Using anonymous functions instead of module or block. Bad idea? [duplicate]

Here is an example function which returns True if a point p is on an (open) line segment (A, B) assuming that Orientation[A, p, B] returns 0 if the three points are collinear: ...
74 views

### Inverting a Spline-Function (Bezier or BSpline)

I would like to use a Spline-Function to describe a transformation from one range of reals to another, that is I would like to have a function which maps a value $y$ on $x$ and for simplicity let us ...
61 views

### Distribute and analyze large datasets

I need to analyze very large datasets, and they obviously don't fit in a computer memory. I need to produce some statistics on these datasets, and this brings me here: How can I make some statistical ...
50 views

### Default FontFamily for PlotLabel

This is probably a rather basic question and I presume I am simply unable to make proper use of the Options[] function: I am trying to figure out what the default ...
23 views

### Constraining solution's sign with NSolve

I am solving some equations in 4 variables, however, there are many solutions which are basically the same but changing relative signs of each other ... i.e. {x->-1,y->1} and {x->1,y->-1}. ...
30 views

### How to open hyperlink (from web-embedded CDF) in new tab

my problem is that I can't handle this. Assumptions: CDF is web-embedded. (created by me) Hyperlink should open only after mouse clicking, no combinations with keyborad's keys are allowed. ...
64 views

### How can i get the solution of complicated equation?

This is the equation about zeta. NSolve[equation] could not solve this equation. (I think it is too complex to solve by NSolve.) I want to know how can i solve this equation such a complicated ...
50 views

### “Save Graphic As…” does not include plot legends

I am creating some plots with Show but unfortunately the PlotLegends seems to be out of the bounding box when saving the graph. ...
50 views

### Finding all simple paths between two vertices in a graph

There are built-in methods to find a shortest path between two vertices in a graph, and the question on finding all shortest paths between two vertices has gathered quite a bit of attention. A path ...
68 views

### How can I set multiple values to local variables in a Module?

Multiple assignment is supported by Set. How can do something similar in Module expressions? If I could do it, whould there be ...
113 views

### Can I use GoogleMap or other GPS data in creation of the Graphs?

I have following graph. ...
92 views

### What does InternalInheritedBlock do?

What does the function InternalInheritedBlock do? How is it different from the regular Block?
41 views

### How to apply multiple/complicated requirements for a pattern in a function input

In this question. I suggested that to test whether the input of a function was a matrix of numbers one could create the following test: ...
70 views

### Projection of a set of 4D points to the 3D space

Consider the following set of points in the 4D space: ...
53 views

### How many combinations are there with a 4-digit pin? [closed]

A pin can be any number between 0000 and 9999. So I'm guessing there are 10,000 combinations. But I also read somewhere that you calculate by doing 4*3*2*1 = 24. Since you can re-use numbers, I ...
58 views

### Counting multiplications (complexity function)

I'm trying to count the number of times multiplication appears in an expression (for the purpose of constructing a ComplexityFunction that would help me simplify a terrible algebraic expression for ...
119 views

### Embed Code Into Image

I often export images(plots, matrix, arrays, etc..) from mathematica which I end up putting in word documents or uploading to the web. The problem is that I often lose the original code and I am left ...
7 views

### Does Euler totient function gives exactly one value(answer) or LEAST calculated value(answer is NOT below this value)? [migrated]

I was studying RSA when came across Euler totient function. The definition states that- it gives the number of positive values less than n which are relatively prime to n. I thought I had it, untill I ...
12 views

### Statistics Question [migrated]

This is probably super simple to most of you on here, but I was chatted by a friend earlier with a question. It reads just like this: ...
41 views

### Is the TCPIP link type compressed?

Since I'm already piping a MathLink connection in a ssh tunnel (connect back is a pain!), I wonder if it makes sense to compress the data in the stream (ssh -C). As ...
51 views

What string pattern will match an explicit asterisk (*) or at-sign (@)? The obvious example, StringMatchQ["*", "\*"], returns ...
76 views

### Finding integral points on a surface

Suppose I have a dimension formula (for a Lie algebra representation) that is as follows: $$d(a,b) = {(a+1)(b+1)(a+b+2) \over 2}$$ Now consider the surface $F(a,b,n) = 0 = d(a,b) -n$ where \$n \in ...
107 views

### Mapping multiple functions

This question was part of a course on Mathematica written in 1998. Each of the functions f1, f2, and f3 defined below has a root near x=2. Map an anonymous function involving FindRoot[] onto ...
32 views

### How to extract data of large function

Here I have one problem with command for I guess, but I am not sure. If I have function f[x] but not enough ram memory to save it in closed form, how to make code to compute it for chosen values. It ...
43 views

### Sorting Eigensystems [duplicate]

SO I have this code: ...
63 views

### Every second evaluation in notebook front end is slow

I'm having a rather baffling problem that Wolfram was unable to help me diagnose, and I'm hoping one of you geniuses in residence here can figure it out. (I don't get access to the Technical Support ...
40 views

### Using Or While in Select [closed]

So I have a list of values containing both real and complex expressions. I want to pull out all of the values that have either a positive Imaginary part or a positive real part(if Im[#] = 0). I have ...
81 views

### Making a calculation with high precision

I would like to make the following calculation: 1/Sqrt[1 - (150^2 10^(-4))/(9 10^16.)] - 1 Mathematica 8 returns 0. The result is obviously not 0, but my ...
44 views

### Is it possible to import data from Google Analytics?

Using Mathematica, is it possible to pull data directly from Google Analytics? Unfortunately, GA exports messy csv files, and I was wondering if there was a direct ...
108 views

### Forecast Future Stock Prices - Brownian Motion - Again

excuse me, I think I have here a technical problem with Mathematica yesterday I posted the question with the title: Forecast Future Stock Prices - Brownian Motion I am still not very experienced but ...
43 views

### Is this being simplified correctly? [closed]

I'm unsure if this is a bug or if it's a case of Mathematica not doing quite what I expect it to. ...
60 views

### String encoding issue with Pythonika

I use Mathematica and Pythonika to run Python code inside it. And I'm not quite sure what causes my issue: all unicode Python objects look like this: ...
63 views

### Fourier transform of a signal

I have problem of finding right answer for my problem. Here is my equation: $$E(t)=\sum_{n=1}^{\infty} c_n \sin\left(\frac{n \pi}{T}t\right)$$ What have I done: I have a notebook asking for 3 ...
57 views

### Some _atomic elements' TreeForm looks confusing with Level in appearance

In[1]:= Level[1/2,{-1}] Out[1]= {1/2} TreeForm[1/2] ...
95 views

### Plot sublists as different colors

I have one big list with many sublists inside. All sublists consist of three numbers. For example: ...
35 views

### Does a manipulation of a plot area produce new data?

You do a ListPlot. Plot[Sin[x^2], {x, 0, 1}] pdat1 = With[{fig = Plot[Sin[x^2], {x, 0, 1}]}, First@Cases[fig, Line[x_] :> x, Infinity]]; You ...
52 views

### FindRoot don't find my root! [closed]

Im working with these functions ...
69 views

### How to extend dictionary.txt

How to extend the default dictionary.txt for Dictionarylookup to all words? For example, first I ...
82 views

### ListContourPlot is blocking my geometry

I have a Navier-Stokes solution for a flow past a cylinder. I have attached the DAT file. The columns in the DAT file contain the x,y,u,v,p data, respectively. The DAT file can be obtained from our ...
122 views

From ...
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### Options which require RuleDelayed

For some functions in Mathematica it is important to use RuleDelayed. One prominent example is the EvaluationMonitor for ...
855 views

### Having used Mathematica as a “gateway” language, where to from here?

I have been using Mathematica for about a year. It is the first language that I have attempted to learn. I'm still very much a newbie, but there are moments I feel more like I am waving than drowning. ...
107 views

### Is it possible to Import urls not type “”

These days I often copy urls from Internet Explorer's address bar. When I paste the url into a Mathematica cell it is neither a string nor a expression. ...
46 views

### Abridging Lists of Equations within NDSolve, Manipulate [duplicate]

I have a pretty little NDSolve function that I've finally decked out with manipulatable (by sliders) coefficients, which changes the graph in real time. However, I ...