2
votes
1answer
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 ...
0
votes
0answers
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 ...
-1
votes
2answers
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 ...
2
votes
1answer
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:
...
1
vote
0answers
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:
...
3
votes
3answers
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 ...
5
votes
1answer
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 ...
5
votes
1answer
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 ...
0
votes
1answer
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}.
...
1
vote
0answers
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.
...
0
votes
1answer
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 ...
2
votes
1answer
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.
...
0
votes
0answers
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 ...
3
votes
1answer
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 ...
3
votes
2answers
113 views
16
votes
1answer
92 views
What does Internal`InheritedBlock do?
What does the function Internal`InheritedBlock do? How is it different from the regular Block?
3
votes
2answers
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:
...
0
votes
1answer
70 views
Projection of a set of 4D points to the 3D space
Consider the following set of points in the 4D space:
...
-2
votes
0answers
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 ...
3
votes
3answers
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 ...
5
votes
2answers
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 ...
0
votes
0answers
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 ...
-1
votes
0answers
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:
...
1
vote
0answers
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 ...
2
votes
1answer
51 views
Explicit asterisk or @ sign in string patterns
What string pattern will match an explicit asterisk (*) or at-sign (@)? The obvious example, StringMatchQ["*", "\*"], returns ...
1
vote
2answers
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 ...
2
votes
2answers
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 ...
-1
votes
1answer
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 ...
1
vote
0answers
43 views
5
votes
0answers
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 ...
0
votes
0answers
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 ...
1
vote
3answers
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 ...
3
votes
0answers
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 ...
-3
votes
3answers
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 ...
1
vote
0answers
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.
...
3
votes
1answer
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: ...
0
votes
0answers
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 ...
3
votes
1answer
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]
...
3
votes
3answers
95 views
Plot sublists as different colors
I have one big list with many sublists inside. All sublists consist of three numbers. For example:
...
2
votes
1answer
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 ...
-2
votes
0answers
52 views
1
vote
0answers
69 views
How to extend dictionary.txt
How to extend the default dictionary.txt for Dictionarylookup to all words?
For example, first I
...
4
votes
1answer
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 ...
6
votes
2answers
122 views
11
votes
2answers
112 views
Options which require RuleDelayed
For some functions in Mathematica it is important to use RuleDelayed. One prominent example is the EvaluationMonitor for ...
24
votes
7answers
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. ...
6
votes
3answers
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.
...
0
votes
0answers
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 ...
0
votes
0answers
22 views
How to quick locate error lines in the Mathematica .m File [duplicate]
Syntax::sntue: Unexpected end of file (probably unfinished expression)
(line 131 of "MyWord`").
possible to show line number?
-1
votes
0answers
49 views
Doing vector manipulations in Mathematica (Part 2) [closed]
Inspired by the answer from Simon Woods, here, Doing vector manipulations on Mathematica, I thought of doing the intended vector manipulation in the following way but it didn't work!
...
