1
vote
1answer
239 views

Estimating Confidence Interval Variance covariance matrix from weibull distribution

In The following Example 50 obs . I estimated distribution parameters (by point) but *i want to estimate parameters by confidence interval and calculate covariance matrix i need help * ...
2
votes
1answer
311 views

Choosing The Best Fitted Probability Distribution Model

The following Example 20 Obs and i used Goodness of fit test with Exponential distribution, another time with Weibull distribution and third time with Pareto distribution .All of them are significant ...
3
votes
2answers
112 views

The conflated two uses of SameTest within Intersection

Intersection works as expected in this case... a = Range[1,5];b=Range[3,7]; Intersection[a,b] giving... {3,4,5} However if ...
10
votes
2answers
263 views

Reading grave stone letters in an image

(Click on image to enlarge) (Click on image to enlarge) Is there an image processing technique that would aid in reading the letters and numbers on a grave headstone? Most stones are etched into ...
7
votes
3answers
435 views

Spacing the elements in a bar chart with error bars

In the Add-Error-Bars-to-Charts-and-Plots How-To in the Mathematica documentation, a function ErrorBar is given: ...
1
vote
1answer
167 views

How to evaluate complex numerical integral in mathematica?

I have an integral of the form \begin{align} F(\omega) = \int_0^{\infty} f(s,\omega) \mathrm{d}s \end{align} which I would like to numerically evaluate and plot for a range of $\omega \in [-30,30]$...
1
vote
1answer
612 views

Solving Fredholm Equation of the first kind [duplicate]

I want to numerically solve Fredholm integral equations of the first kind, equations of the form $$g(t)=\int_a^b K(t,s)f(s)\,\mathrm{d}s$$ where we know the functions $K(t,s)$ and $g(t)$ and seek to ...
1
vote
1answer
118 views

Ticks Label in 3Dplot in Mathematica

In 3DListPlot, I am plotting data such that I have discretized a contineous function. While plotting, I automatically get the ticks labeling, marking the discrete points. I want to replace the ...
12
votes
0answers
228 views

Plotting extra parametric axes [closed]

We are trying to plot a figure as below from data points. This version is a postprocessed plot (in Illustrator) just to obtain the skew axes. The rest is plotted with ...
10
votes
1answer
213 views

Notebook's WindowSize interference with contents' Dynamic ImageSizes

Bug introduced in 8 or earlier and persists through 10.4.0 or later Consider the following MWE: ...
6
votes
6answers
363 views

Total by a criteria

I am developing a weighted KNN algorithm. In a step, I need to do the sum of weights of each class. For example: ...
5
votes
2answers
159 views

Non sequitur in documentation of MemberQ

Mr.Wizard's question about MemberQ and FreeQ got me to re-read the documentation for those functions. I find I don't understand ...
0
votes
3answers
284 views

Importing multiple files with a loop

I have 101 files with data that I want to import into Mathematica. All the file names are numbered as follows datafile.20.0000.out, datafile.20.1000.out, datafile.20.2000.out and so on. I used the ...
5
votes
3answers
531 views

What is the best way to write a polynomial in the Bernstein basis?

The Bernstein basis of polynomials of degree $n$ is the set of polynomials of the form $$\binom{n}{k} t^{n-k}(1-t)^k$$ where $0 \leq k \leq n$. What is the best way to transform a given polynomial ...
3
votes
1answer
211 views

Importing data from Matlab, using data in “NSolve” and send the results back to Matlab

I have generated an image processing code in Matlab. It has several subroutines and in one of them, I should solve a system of 7 nonlinear equations. I use "fsolve" in Matlab to solve this system, ...
3
votes
1answer
68 views

How can I show the inline parameter list with a keybinding while typing a function?

Is there a way to invoke either of these contextual menu buttons that popup when typing? I don't really like to move my hand over to the mouse just to see in what order the parameters are supposed ...
3
votes
1answer
161 views

Fast list interpolation over common x,y for multiple variables

I have a (long, >50K elements) unstructured list with a header similar to; AList[[1]] = {x,y,z,var1,var2,var3,var4,...,varN} I want to interpolate z, var1, var2, ...
0
votes
0answers
525 views

Poincare Section of an Hamiltonian

I'm in desire to plot the Poincare Section of a differential equation defined by a hamiltonian system. The hamiltonian is as follow: ...
5
votes
2answers
395 views

Converting image data to array

I'd like to convert these images to a list or array in order to graph them. I know some rows are unreadable, but it doesn't really matter. So I tried using ...
3
votes
1answer
389 views

Find the NullSpace of a matrix whose determinant is “almost” zero

If $A$ is a matrix such that $\det(A)=0$, it is easy to get a basis of the kernel of $A$ with NullSpace[A]. Now let's consider a matrix $B$, function of a ...
3
votes
1answer
93 views

TeXForm producing weird outputs

When executing TeXForm[ElementData[8, "ElectronConfigurationString"]] the resulting TeX markup appears to include some ...
17
votes
1answer
197 views

A bug in the overloading of MemberQ and FreeQ for Association?

Bug introduced in 10.0.0 and fixed in 10.1.0. While answering Pattern match for nested Association I came across behavior of MemberQ and ...
1
vote
2answers
121 views

text analysis: split document in seperated lines

For a text analysis I want to split a large document in seperated lines. Then I want to calculated for example the average number of words. A example of the document is the following: ...
1
vote
1answer
237 views

Using mathematica to understand linear algebra

What is the reason why this does not work, as you can see there is three unknown and I want to see the planes. I have looked through the user manual but there is something that I am not realising! ...
8
votes
1answer
2k views

Get expression type?

Is there a built in function that distinguishes between different kinds of variables? I mean something like: ...
4
votes
2answers
214 views

Looping through a list partition

I got the following list and I would like to loop and partition this list in the following way. ...
2
votes
0answers
201 views

Mathematica not evaluating q derivative of Jacobi theta function

Jacobi theta functions, $\theta_a(u,q)$ for $a=1,2,3,4$ are defined in the unit disk $|q|<1$. For some reason that I would like to understand, Mathematica does not evaluate numerically the $q$ ...
0
votes
0answers
64 views

Is there a command like meshgrid in Mathematica? [duplicate]

Just like the title, I need to do a meshgrid in Mathematica, is there any command like that?
1
vote
0answers
157 views

the default option of NDSolve

How should I find out what the default value of Accuracy and Precision is in the NDSolve? I have a pde that when I asked it to solve for me the equation with a special Accuracy and precision it gave ...
7
votes
2answers
276 views

Catching error in middle of evaluation of compiled function

I have programmed and Compileed a complicated numerical function. The function has singularities (i.e. are infinite) at certain input numerical values. I need to ...
4
votes
0answers
260 views

C compiler options passed by Mathematica

What options can be used for compilation using Compile or CreateExecutable in Mathematica and where can one find details on the ...
3
votes
2answers
173 views

Problem with old code for a Calabi-Yau manifold

I would like to draw a Calabi-Yau space in Mathematica. From Andrew J. Hanson's paper (page 6) about this topic, I got the following code, which just does not show anything at all in my Mathematica ...
1
vote
1answer
95 views

Strange functioning of RegionPlot with Reduce's output

I have defined this two quantities: f = (-b + Sqrt[b^2 + 4 a])/(2 a) g = (-b - Sqrt[b^2 + 4 a])/(2 a) and I want to solve this system in function of $a$, for $f,...
16
votes
0answers
197 views

Calling Sage functions from Mathematica

I recently found a very useful open-source math software called Sage, which provides many useful functions lacking in Mathematica. Since I'm more used to the Mathematica language instead of the ...
21
votes
1answer
280 views

Make my data-structure atomic

Lately, and by lately I mean since version 7 or so, the number of atomic expressions in Mathematica constantly grew. In former times only the native types like integers and optimised arrays were ...
5
votes
1answer
389 views

Areas of Voronoi cells from image file

I have an binary image with non-point objects. Does anyone have any suggestions how to determine area of each Voronoi cell in Voronoi diagram (goal is area distribution)? Thank you in advance.
9
votes
4answers
294 views

Pattern match for nested Association

Suppose I have Association testAssoc=Association[a->Association[1->1,2->2],b->Association[1->1,2->2]] which ...
18
votes
3answers
520 views

Dataset seems unable to handle ListDensityPlot and ListContourPlot

If I create a Dataset: ...
4
votes
0answers
100 views

Create SQL Database on a manually specified directory

I am inserting lots of data into the preinstalled SQL Database in MM: con= OpenSQLConnection["demo"] > SQLCreateTable[con, SQLTable["anyname"], SQLcolums] > ... I am running out of disk space on my ...
10
votes
3answers
340 views

Sorting Lists of lists of arbitrary length

I'm trying to sort a list of lists. The sublists are defined in length, but the length of the list containing it varies. A simplified set might be: ...
2
votes
1answer
100 views

RecursionLimit error when Plotting a recursive function

Why am I getting the error $RecursionLimit::reclim: Recursion depth of 1024 exceeded. >> when I try to plot this fib Fibonacci function in Mathematica? ...
12
votes
1answer
368 views

Mathematica 10 unable to Simplify[Cos[2 ArcCos[A]]]

Mathematica 10 evaluates Simplify[Cos[2 ArcCos[A]]] as Cos[2 ArcCos[A]], instead of the desired ...
4
votes
1answer
130 views

Can't Get BarChart to use ColorFunction

I'm trying to get a BarChart to colour negative valued bars red and positive valued bars green but I'm having a time trying to do it. My latest attempt is: ...
3
votes
1answer
70 views

How do I set up initialization code for Wolfram Workbench MUnit tests?

Say I have a couple of tests like the following: ...
6
votes
4answers
182 views

Expression manipulation: Explode sums and products? [duplicate]

I wonder if the functionality exists to explode a sum, or product? What I mean by that is the following. Imagine, you have input data data = a + b c - d e f ; Is ...
3
votes
1answer
768 views

Wavelet vs instantaneous power spectrum

Following on from a previous question posted by @xslittlegrass and answered by @Sector and others, Extracting information from the result of ContinuousWaveletTransform I'd like to know if it is ...
3
votes
3answers
173 views

Cases or Select for catching elements in a list?

I have A list that contains sublists like that: ...
2
votes
2answers
2k views

Eliminating the Parameter: Transform parametric equation to Cartesian equation and draw arrows along parametric growth

Hey guys I really could use some help on this calc 3 problem. I'm stuck on how to write the code for this problem: a) Eliminate the parameter to find a Cartesian equation for a parametric curve. b) ...
6
votes
1answer
752 views

Collision detection algorithm (discrete) with sweep and prune algorithm

For a more complex collision detection approach, I need an efficient (aka fast) algorithm to prune the elements by using boundary boxes. A classical algorithm is the so called sweep and prune (SAP) ...
6
votes
4answers
351 views

Pattern matching - comparing two lists

I would like to compare two different lists to see if the shorter one is a member of the larger e.g. is the list {2,3}, with that sequence of elements, a member of {1,2,3,4,5}? I have tried using ...

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