# All Questions

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 * ...
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 ...
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 ...
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 ...
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: ...
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 $\omega \in [-30,30]$...
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 ...
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 ...
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 ...
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: ...
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: ...
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 ...
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 ...
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 ...
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, ...
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 ...
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, ...
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: ...
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 ...
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 ...
1answer
93 views

### TeXForm producing weird outputs

When executing TeXForm[ElementData[8, "ElectronConfigurationString"]] the resulting TeX markup appears to include some ...
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 ...
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: ...
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! ...
1answer
2k views

### Get expression type?

Is there a built in function that distinguishes between different kinds of variables? I mean something like: ...
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. ...
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 $q$ ...
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?
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 ...
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 ...
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 ...
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 ...
1answer
95 views

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 ...
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: ...
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: ...
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 ...
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 ...
3answers
173 views

### Cases or Select for catching elements in a list?

I have A list that contains sublists like that: ...
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) ...
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) ...
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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