0
votes
0answers
13 views

If the earth's rotational speed increased by 2% each day starting today…what would be the difference in age 20 years from now?

If the new adjusted revolution of the earth still equaled one day and 365 days still equaled one year, how old would someone be 20 years from now (20 years based on the current rotation of the earth) ...
0
votes
0answers
10 views

How to debug an existing notebook in Workbench

I have an existing notebook that I want to debug in workbench. This notebook is a self contained program that does not use any .m files. From what I can tell from the Workbench documentation you ...
0
votes
0answers
11 views

How to identify primary keys in an existing database table

I would like to identify the primary keys in a DB table using DatabaseLink commands trying to exclude SQLExecute. It seems like SQLTableInformation or SQLColumnInformation may not show that ...
1
vote
1answer
13 views

Memory Problem with Modules and NDSolve

I'm using NDSolve inside a module, and I appear to have a memory leak. The relevant code is: ...
0
votes
0answers
12 views

about Updating Wagon's FindAllCrossings2D[] function

I am working with the shortest version of FindCrossings2D, which was provided by Vitaliy Kaurov. Here is Vitaliy's function: ...
-1
votes
0answers
25 views

Finding R^2 and R^3 of relations [on hold]

Let R be the relation on the set { 1 , 2 , 3 , 4 , 5 } containing the ordered pairs (1 , 1) , (1 , 2) , (1 , 3) , (2 , 3) , (2 , 4) , (3 , 1) , (3 , 4) , (3 , 5) , (4 , 2) , (4 , 5) , (5 , 1) , (5 , ...
0
votes
1answer
10 views

Parallel evaluation hangs before doing anything

[I use Mathematica 9.0.1.0 on OS X Yosemite 10.10.2.] I am experiencing difficulty with parallel evaluation that I am finding extremely perplexing to troubleshoot. I define the following function in ...
3
votes
4answers
57 views

Get Axes Range of Plot?

Say I have some plot plot = Plot[Sin[x], {x,0,10}] (*as an example*) Is there a way I can get the x and y axes min/max values from the "plot" variable? If I ...
0
votes
0answers
44 views

Simplified expression is different than original

I have a question regarding the Simplify command in mathematica. I am working with a 4 x 4 table called Eqs, filled with symbolic expressions. I then do ...
2
votes
1answer
40 views

Mathematica on Raspberry Pi

Can I develop BSD/MIT open-source library for Mathematica using free non-commercial version on Raspberry Pi?
3
votes
1answer
30 views

How to change line lengths in LineLegend

How can I shorten the lengths of the LineLegend[] lines in the following plot? Is there a way to control line spacing as well? ...
0
votes
0answers
15 views

FindMaximum slow for fixed parameters

I hope my problem can be solved by just showing you this tiny part of my code which does not run on its own. I have an optimization problem and want these functions to work on various data sets. ...
1
vote
1answer
12 views

SetterBar Display using MatrixForm

I have vAwGOptns = { {{0}, {0}}, {{1}, {0}}, {{0}, {1}}, {{1}, {1}} }; and would like to select ...
0
votes
0answers
18 views

How to investigate the seasonality of the data

After asking how to get rid of the seasonality of this set of data, I'd like to close the circle with a last question: How to detect seasonality in data using Mathematica? A generic answer (not ...
1
vote
0answers
40 views

Better layout for large a directed graph?

This shows a directed graph for an iterated n-bit pseudo-random function parameterized by s. ...
0
votes
1answer
27 views

Making a black bar in BarChart when using GlassRectangle

I use the command: ...
1
vote
2answers
130 views

3D Gamma function

I try to plot the following function: Plot3D[Gamma[1+0.5*(n+m)]/Sqrt[Gamma[1+n]*Gamma[1+m]],{n,0,1000},{m,0,1000}] I expect that for m=n and near to it the value ...
0
votes
1answer
56 views

Floating point arithmetic bug caused by Table[]

I was doing something fairly ordinary and noticed something I can't, for the life of me, explain. For context, I wanted to take make a function that takes an array of data like the one below, then an ...
1
vote
0answers
12 views

OpenSQLConnection SSPI Library Not Loaded

I am attempting to open a connection to SQL Server with Windows Authentication (SSPI) using OpenSQLConnection and JDBC. ...
0
votes
4answers
53 views

Find all disjoint subsets of equal length

Suppose that $A$ is a list with $n$ elements where $n$ is even. I want to write a function that returns all pairs $(A_1,A_2)$ where the sets $A_1$ and $A_2$ each have length $\frac{n}{2}$, $A_1 \cap ...
0
votes
0answers
22 views

3D scatter plot with specific collor for each dot [duplicate]

I'm a chemist and using cartesian coordinates I've created a 3D scatter plot of my molecule: There is one attribute that I want to show and it is a value that range from -6 to 6, lets say. I'd like ...
2
votes
1answer
205 views

Another square-root simplification problem

In a certain sequence of computations, sometimes I'll get an expression of a form such as Sqrt[u^4 + 4 u^6] which it is necessary to have converted ...
0
votes
3answers
51 views

How to iterate through a list of rules?

Let's consider I have a list of rules: {Aa -> 1/2, Av -> 2/5, Bx -> 3/7, Ce -> 4/9, ...} I want to find all keys that contain the letter "A" and ...
1
vote
1answer
14 views

Replace Coefficients of multivariate expressions by numbered constants

I have an expression which is a polynomial in Delta, xi and phi. The prefactors are huge ...
1
vote
1answer
41 views

Using Specularity effects and ColorFunction in Plot3d

I'd like to reproduce the 3d surface of the attached image . What I'm interested in, is the light reflection at the basis of the surface and the rainbowlike color. I use Plot3d and colorfunction in ...
3
votes
2answers
58 views

Deseasonalize the data of traffic growth for the past data

In another question (Using TimeSeriesForecast for forecasting the traffic growth) I asked to use the TimeSeriesForecast on this set of data the answer provided the plot with and without the ...
1
vote
1answer
42 views

NDSolve in Mathematica won't use all the cores avaiable

When I solve a system of differential equations in Matlab, the task manager shows that all the CPU cores are in use. This is not true when I solve the same system in Mathematica. I have six cores. ...
3
votes
3answers
44 views

Multiple integrals where the number of integrals is aribtrary

I know that I can do, say, a triple integral such as $$\int_{a_x}^{b_x}\int_{a_y}^{b_y}\int_{a_z}^{b_z}f(x,y,z)\,dz\,dy\,dx$$ with the input ...
0
votes
0answers
29 views

Export a 3D array (with time) from matlab to mathematica

I am using again Mathematica and enjoying it. I have a question, is there a way to do a "time" plot of 3D vectors? I try to be more clear, I have 12 vectors (3D vectors). They are changing over ...
2
votes
0answers
30 views

Region bounded by ellipse and line

I have an ellipse defined either as algebraic or geometric: algebraic: ax^2 + bxy +cy^2 + dx +ey +f = 0 geometric: major Axis, minor Axis, x center, y center, rotation angle from horizontal And I ...
1
vote
0answers
27 views

Load a package and use it's functionality inside C#

I am trying to make a windows C# form which uses some functions that I wrote inside Mathematica. Suppose that we have the following package: ...
0
votes
1answer
26 views

how to download using weather data function many proporties exactly.

how to download using weather data function many proporties exactly. Example WeatherData["WMO44292", "Humidity", "Pressure", "Temperature", \ {{2005, 1, 1, 0, 0}, {2015, 1, 1, 0, 0}}] .
1
vote
1answer
25 views

How to change time zone for all outputs? [on hold]

How to change the time zone in Mathematica for all functions returning a date or time?
1
vote
0answers
43 views

Why am I getting a conditional output when importing the Dirac Equation to Mathematica?

Just starting out with Mathematica and trying to use the Dirac Equation. I'm working with the following form of the Dirac Equation: $$ i \hbar \gamma^\mu \partial_\mu \psi - m c \psi = 0 $$ And my ...
4
votes
2answers
84 views

How can I insert an element every $n$th position in a list?

How can I insert an element every $n$ positions in a list? For example, inserting a zero as every 4th element to turn {1, 2, 3, 4, 5, 6, 7} into ...
3
votes
0answers
70 views

Delete duplicates by a criteria

Given that I have a set of points as below ...
-1
votes
2answers
72 views

Want to compute the permutations of {1, 2, …, 11} with only 3 GB of memory [duplicate]

There is another way to calculate Permutations [{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}] without triggering an error, I have 3 GB of RAM with WIN 7
0
votes
1answer
52 views

Eliminating parameter from parametric equation

In Mathematica Online I tried: Eliminate[{x == t + t^3, y == t - t^3, z == 1 + t^4}, {t}] ...
0
votes
2answers
52 views

Complete definition of special functions in Mathematica [on hold]

How can one display the actual integral involved in special functions like this MarcumQ[2, a, b] in Mathematica?
1
vote
1answer
56 views

How to modify a PDE inside NDSolve according to an if condition

I need to solve this PDE $$\partial_tf(t,x)+\partial_xf(t,x)+k\partial_{xx}f(t,x)-xf(t,x)=0 $$ with $k\in\mathbb{R}$ and final condition $f(T,x)=1$ with $0<t<T$. My problem is how to solve ...
0
votes
0answers
26 views

Why does ParallelMap throw errors where Map does not?

I am encountering a problem with ParallelMap. I have a call in a large code base, part of which attempts to fit data in parallel using ...
2
votes
1answer
48 views

Show [In] and [Out] tags after quitting Mathematica

I cannot find a way to show [in] and [out] tags when evaluating cells after I close the application. Is there a way to keep these shown? I disabled the kernel in global options but cannot transfer ...
0
votes
1answer
47 views

Tutorial for Map, Apply, etc

I have this code: ...
0
votes
0answers
18 views

Is there any way to format the results of Wolfram|Alpha

I have noticed that when getting Wolfram|Alpha results via WolframAlpha[], the output is formatted to (what appears to be) Times New Roman and Helvetica for units ...
0
votes
0answers
29 views

Parallelize: No speed-up when using with FindMaximum

I have developed a program to compute the maximum value of an specific function multiple times, with different parameter values each time. I've been using the ...
0
votes
0answers
22 views

Returning multiple results from compiled functions in M10 [duplicate]

I have found a similar question from 2012 here. It has been 3 years now and we have version 10. Have there been any attempt to solve this problem either by Wolfram or by the community - how to return ...
0
votes
0answers
38 views

Long term growth model. Recurrence solution in NestList not behaving as expected compared to NDSolve

I'm trying to model the long term growth of a bioreactor according to monod kinetics: $ x'[t] = $$Qin \over V$ $( x_0-x[t]) + x[t]*\mu[t]\\$ $ s'[t] = $$Qin \over V$ $( s_0-s[t]) - x[t]$ $\mu[t] ...
0
votes
0answers
35 views

Any way of solving this system of nonlinear equations with non integer powers?

I have a system of four nonlinear equations. Some of the exponents are fractions. I was wondering if this is what is causing NSolve to run for hours without giving ...
0
votes
0answers
41 views

Tools for factoring large numbers [on hold]

My laptop is Acer aspire one , what do I need for factoring very large numbers,say 1000 digits in reasonable time .What the best thing I can do, Should I buy something ? (Software ?). Is mathematica ...
2
votes
0answers
28 views

Display of ConfusionMatrixPlot depends on Stylesheet

I´m using Classify and do the testing via ClassifierMeasurements. Now I observed that ConfusionMatrixPlot is not shown correctly when using StyleSheet Report(default). Maybe you can reproduce (example ...

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