All Questions

3k views

Solving an ODE in power series

How do I find a series solution to an ODE? I do not mean taking the Taylor series of an exact solution; I want to solve nasty nonlinear differential equations locally via plug and chug. Surely, that ...
23 views

Trapezoid Integration over a list of pairs

I have two very connected questions: Is there really no built-in function to integrate a list of pairs without converting to a function? Something like: ...
12 views

Why some alpha + Evaluate return Pod, some return only return an Entity?

Why some alpha + Evaluate return Pod, some return only return an Entity? Here is an example
80 views

how to do VectorPlot?

I have a problem with VectorPlot for spin current density and I tried it my self but not working. Here is the code according to Jens solution: ...
987 views

How does one plot a Möbius Strip?

How can I plot a Möbius strip? I tried this one, but I can't get it to work: ...
31 views

Filtering the close values from the list?

I found some difficulty to flatten the data. Let's say we have a list such that, list={-0.0223, -0.0199, -0.0195, -0.0159, -0.0159, -0.0122, -0.0126} You can ...
26 views

Best way to count this?

I'm trying to use the Count function for this purpose, but it's not working how I'd like it to. Does anybody know a simple way to do this counting? I would like to be counting the number of "p"s in ...
5k views

Minimal effort method for integrating C++ functions into Mathematica

As of Mathematica 8, what is the minimal effort way to integrate an existing C++ function into Mathematica? I think we have these: MathLink (it was quite long ago I used it last time) communication ...
13 views

Relative Volatility Index in Mathematica

How does Mathematica calculate Relative Volatility Index?
19 views

Change some elements at the second level of a list based on some conditions

I need to change some elements at the second level of a list based on some conditions. I have the following list of objects of the same type: ...
73 views

Problem with NIntegrate and FindFit [on hold]

I fit the experimental curve with the model using the following equation, ...
205 views

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140 views

Mathematica 10.2 break downs when StreamPlot-ing

Bug introduced in 9.0.0 and persisting through 10.2 or later This code meets error: ...
139 views

In FinancialData what is the difference between FractionalChange and Change?

In FinancialData there are two similarly named properties one can request for a given stock symbol: Change and ...
475 views

69 views

Select from a list using another list of limits

Given a list of values list1 = {2.4, 3.4, 5.9, 1.2, 9.5, 7.5} and a another list containing theoretical maximum values ...
25 views

Simplify Mod to subtraction when possible

FullSimplify[Mod[t,10], t>101 && t<109] It's a long shot, but can I get Mathematica to return t-100 or something ...
67 views

WSTP hangs up in Mathematica 10.2

I have a problem with WSTP in the newest version of Mathematica. I get the same problem on Ubuntu 14.04 and Mint 17.2. Using the pre-built examples (...
33 views

Export numeric data with preset decimal places

I have a table of pairs of numbers, each with 300 decimal places, which are all important. If saved using Export["data.dat", data] and then imported back via Import["data.dat"] - then the 300 decimal ...
14 views

Simple Two-Axis Plot in Mathematica? [duplicate]

Is there a simple way to implement a two-axis plot in Mathematica? On Quora.com there is a suggestion to use Show to combine two different plots with the same x-axis domain and with y-axes on ...
70 views

Why does Nearest not support Sqrt?

Simple examples with two points nf1=Nearest[{{0, 0}, {Sqrt[2], Sqrt[2]}}] nf1[{0, 0}, {All, 2.1}] gives {{0, 0}} This is ...
20 views

Error: Part specification is longer than depth?

I am following this topic in order to get my resuls. This code should be quite general but I get a really basic error which I don't understand how... So my code is: ...
99 views

Mathematica function to calculate equivalent NormalDistribution from a WeibullDistribution

I have a WeibullDistribution with mean 12.0 and standard deviation 3.2. Is there any built-in Mathematica function that calculates an equivalent ...
63 views

How to solve nonlinear equations involving integrals

Sorry, if this is a duplicate, I was not able to find a corresponding answer. The only question related to mine, as far as I can see it, is this one: How to solve algebra equations containing ...
31 views

Numerical Analisys and StepDataPlot

I'm using StepDataPlot to compare several methods for differential equations. Does exists a function, or something else, to find the number of steps that the choosen method used to find the numerical ...
23 views

Mathematica 10.2 Notebooks Freezing

I've been having a problem with notebooks in Mathematica 10.2 freezing up on my Windows 8.1 laptop. It seems to happen when I am typing input. The notebook freezes (become unresponsive) for 30 secs ...
15 views

Formatting legend text font multiple times

I have the same question as asked in this question. With the difference that I want to change multiple legend entries. I tried: ...
148 views

Existence of an analytical form for integral

Can the following integration be performed with an analytical output? ...
100 views

Through does not work with Subtract

Through[(Max - Min)[#]] & @ {1, 2, 3, 4, 5} gives 5 + (-Min)[{1, 2, 3, 4, 5}] Of course I can work around by ...