# All Questions

12 views

### GeoProjection for astronomical data - points out of plot &wrong ticks

Here is an excellent answer to what I wanted to do. Unfortunately, I encountered two issues. For setting the stage, here is the datafile, and this is my initialization code: ...
28 views

### Error in the solving of the simultaneous Ordinary Differential Equation

As i am trying to get the solution of the simultaneous Ordinary Differential Equations ...
63 views

### Help with Integration

I am new to Mathematica, and I need help with integration of the following Reliability expression (from a well-known Reliability Model). $$R(t)=e^{-Ne^{-bt_i}(1-e^{-bt})}, t \geq 0$$ I have ...
49 views

### How to find the same number in sublists of list

Intersection[Table[Table[Sqrt[p1]/r1,{r1,0.1,0.7,0.1}],{p1,0.5,5,0.5}]] I am trying to find same numbers in the sublists. But Intersection is not working for ...
22 views

### Funny behavior when computing dot product of coefficients with high-order polynomials

I have a similar problem to Funny behaviour when plotting a polynomial of high degree and large coefficients. However, the thing being evaluated is not just a polynomial but a dot product of some ...
42 views

### Difficulty using LUDecomposition

I'm having trouble using LUDecomposition with pivoting. I read the Mathematica help on this particular command, but I'm still lost. Take a matrix like: ...
34 views

### Why is mathematica eating a row from QRDecompostion

I'm attempting to calculate the QRDecomposition of the matrix: a= {{1,3},{0,5},{2,-8}} QRDecomposition [a] The answer mathematica gives me is: - Q which is a ...
734 views

### Mathematica 10 cannot solve definite integral

Bug introduced in 10.0 and fixed in 10.0.2 Mathematica 10 fails to solve the following integral, saying that it does not converge. ...
719 views

### NDSolve::ndcf: Repeated convergence test failure. How to solve?

I am trying to simulate a system of $n$ pendulums with some friction in Mathematica 9. This is the code I am using: ...
187 views

I am trying to get CUDAFunctionLoad to work with Mathematica 9.0. I installed the latest clang and the Nvidia Tools 6.0. but I keep getting the error message: ...
30 views

### Tree graph showing the orbits under the Collatz map?

ReverseCollatzPaths is a nice demonstration of a radial tree graph showing the orbits under the Collatz map. However, Jason Davies gives, I think, a nicer visulalization using Python, with a ...
134 views

### Behavior of TimelinePlot with multiple datasets of associations

Bug introduced in 10.1 and persisting through 10.2 or later The following TimelinePlot behaves as I would expect: ...
143 views

### After editing a file Mathematica 10 interprets […]^2 as […(])^2

Bug introduced in 10.0 and persisting through 10.2 or later This is a very weird bug and I don't really know how to reproduce it, so I'll just copy-paste the whole code ...
104 views

### Memory leak when looping over FindInstance in version 10.0.0

Bug introduced in 10.0 and fixed in 10.1 When I run the following (simplified) code with FindInstance, my MemoryInUse is ...
108 views

### One less arrow vector than asked for

Bug introduced in v10 and persisting through 10.2 or later Consider the following code: ...
174 views

### CDF Player - MMA9 - MMA10 oddities

I'm (slowly) building a WordPress site with some didactic simulation made with Mathematica. Users can run the simulations (on-line or off-line) with the free Wolfram CDF Player. One of the last ...
99 views

### Solve slower in versions 9 and 10

With some systems of equations, Solve is much slower in versions 9 and 10 than in earlier versions, apparently because it is doing more simplification of the ...
160 views

### Poor/wrong sampling in 1D DiscretizeRegion of splines?

Bug introduced in 10.1 and persisting through 10.2 or later Context In relation to this question I have would like to use splines to define a ...
97 views

This question may be closed as "too localized". I post in the event other users have had this error and resolved it. The problem: inability to use "ReliefMap" or "ContourMap" options for ...
49 views

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43 views

### Why does the Ver. 10.0 FrontEnd lose matching of parentheses when we insert quotations?

I am running Mathematica 10.0.1 on a four-year old iMac running OS 10.6.8. The following irritating behavior occurs regularly: I have a list with parentheses, and later on I need to add something to ...
147 views
+50

### How to parallelize a Do loop containing URLFetchAsynchronous?

I'm have a simple piece of code: results={}; Do[If[!FailedQ[g = grab[i]], AppendTo[results, g]], {i, 2000000, 3000000}] I had thought that the simplest way to ...
36 views

### Derivative of vector dot product with respect to a vector

I have the expression: Transpose[gvecI, {2, 1}].x (m[1] + m[2]) gvecI and x are [3x1] ...
14 views

### How to disable OperatorSubstitution in a style sheet without losing syntax highlighting for local variables

I'm trying to define a custom style sheet that has "OperatorSubstitution" set to false in order to keep fonts consistent. However, whenever I disable this, I lose ...
30 views

### Why is kernel quitting during Manipulate and CurrentImage

I have a Manipulate that captures a camera image using CurrentImage, does some (fairly complicated) processing on the image, and ...
22 views

### Another question on JLink and Wolfram Workbench while debugging

Here's my problem. I need to create a link between a client that is a parallel Wolfram kernel and a server through a Java API. I'm using Wolfram Workbench in debugging mode (like most of the time ...
66 views

### All value types for a symbol?

Robby Villegas here shows a nice way to see all the types associated with a symbol. He sets a symbol, valueTypes, to an explicit list of the values types in ...
111 views

### Efficient List of Lists

I'm running some analysis that requires the creation, row by row, of a large list of lists. The big list is called "Nodes" and it will ultimately contain hundreds of thousands of rows. The first few ...
35 views

### calculate relationship between cause and effect (rows/columns/delta etc.) on tableform

I tried to enter this Excel (on the right of the picture) information to program. following these codes has been used: ...
66 views

### Delete vertices of degree 2 and rewire graph

I want to delete all vertices of degree 2 from a graph and rewire it. Given a graph like graphA, I want to obtain graphB. ...
29 views

### Domain Restriction for ListPlot

I constructed a table (here called 'distanceplot') with a set domain (from 0 to 100). I wish to keep this domain for the table constant. However, I shall be making multiple plots, each using a ...
63 views

### How can I remove the decimals in the frame ticks?

Is there any way to remove the decimal places in the frame ticks. I would like to make the y axis ticks integers. I use the following code. My only problem is how to manipulate the y axis without ...
32 views

### Simplifying Expressions for FindMinimum

I am currently trying to apply the FindMinimum function to find the lowest energy of an expression. My current expression as of now is relatively complicated. It is the summation of 48 similar terms, ...
58 views

### Numerical integration giving trouble [on hold]

Recently I have been struggling with this problem and I think an outside look (and expertise) is what I need. I have a set of equations that in the end give me the tuple ...
61 views

### Saving numerical values to a *.dat file

I have a function like this: ...
85 views

### Sections with unidirectionally shared variables

I have 2 sections is my notebook: ...
447 views

### When are If, Piecewise, Switch, and Which interchangeable and when are they not?

Experimenting with joint dependent distributions via the TransformedDistribution function, I used the following to derive a distribution where the second variate is ...
211 views

### Switch inside Manipulate controls statement

I am using this code inside Manipulate: ...
89 views

### How to handle Indeterminate TimeConstrain

I have to use Timeconstrained[aux] first for avoid some bigs calculation that dont need and it use a lot of time of calculate, so i can't do this. ...
98 views

### How are p-values in fittings estimated?

I am trying to understand how p-values retrieved in a ParameterTable estimated but I couldn't find any specific information in the documentation about this. For instance, considering ...
302 views
+100

### Returning multiple results from a LibraryLink function

What is the best way to return multiple inhomogeneous results from a LibraryLink function? Imagine that the result of a single computation is several tensors of different dimensions and several ...
793 views

### How accurate is GeoDistance?

Two years ago I tried an evaluation copy of Mathematica. I reported various inaccuracies in the GeoDistance routine to which I never received any fix. Could ...
51 views

### Create a sum with the Do function and modules

I should define a function which sums up from k=0 to 100, with x=1; using the ...
78 views

### Binomial Regression where n > 1

I am not well versed in Generalized Linear Models, but am trying to use this approach to model some discrete data. I have binomial data where the sample size for each observation is the same size, ...
19k views

### How to express trigonometric equation in terms of of given trigonometric function?

How can I express a trigonometric equation / identity in terms of a given trigonometric function? using following trigonometric identities ...
103 views
+100

### Accessing figure style (oldstyle or lining) of TrueType fonts

Most professional fonts come with at least two figure styles: old style (or text) figures and lining figures. In plots and most other figures I prefer to use lining figures. This is no problem with ...
164 views

### Suppress Print[ ]s?

I have a complex program that prints out lots of diagnostic/tracing information. Is there some mechanism to evaluate it and suppress all printing? I know I could protect every ...
192 views

### Why are some option values symbols, other strings?

Is there a rationale, beyond historical accident, why some Mathematica option values are strings, while others are symbols? It seems natural that some value spaces, e.g. named color schemes, are so ...
85 views
+50

### What's the difference between Interpolation[pts, Method -> Spline] and BSplineCurve?

Last month, I answered a question about spline interpolation,please see here Now I do the following operations ...
Three months ago, I asked a quesion about B-Spline basis function here, Today, I used this function to plot B-spline curve. The definition of $N_{i,p}$ ...