0
votes
0answers
14 views

PlotRange -> All for Show [duplicate]

I want to fit a gaussian function to a data below: ...
0
votes
0answers
26 views

Defined a function but it doesn't seem to work

I'm trying to implement the line-crossing algorithm on Mathematica and I seem to be having trouble getting it to work. More specifically, I would like to know what is causing the function to not ...
1
vote
0answers
21 views

difference between FullSimplify and Simplify

I have a problem to dinstinguish the following two mathematica codes, the only difference is the first use FullSimplify and the second is Simplify. but the results are totally different. what is wrong,...
1
vote
1answer
16 views

Converting a list of lists of indices into a sparse matrix of ones and zeros

I have data formatted like {{a,b},{c,d},{e,f}} where each entry is an integer. I need to turn this in to a sparse array with entries ...
-1
votes
1answer
20 views

Proof The union of an infinitely countable set and an element is countable [on hold]

If $A$ is countable infinite set and b $\notin$ $A$, then $A$ $\cup$ {b} is also countable. I thought of starting of saying lets assume $A$ $\cup$ {b} is countable and show that $A$ is a subset of it ...
2
votes
2answers
52 views

How to use NestWhileList with a function of two variables

I want to iterate a function of two variables in NestWhileList. Obviously it will need a termination condition. For example imagine I have this function: ...
0
votes
0answers
35 views

Python Convolve2D functionality in Mathematica

I am new to mathematica. I am looking for an alternative for scipy.signal.convolve2d. I did find functions like ListConvolve, ...
0
votes
0answers
43 views

Complex Analysis with MATHEMATICA [on hold]

I am interested in chapter 21 of the book: Complex Analysis with MATHEMATICA by William T. Shaw. chapter 21 - Conformal mapping II: the Schwarz—Christoffel mapping pp. 451-472 I'm not able to get ...
0
votes
0answers
28 views

Putting constraint on a replacement rule

I am a neophyte in Mathematica programming and your help is appreciated. I'd like to restrict the values that a parameter can take. These are my parameters ...
1
vote
3answers
53 views

Evaluating $\int_0^\infty dx /{(x^2-a^2)^2+b^4} $ returns a negative number

I am trying to evaluate $\int_0^\infty dx /((x^2-a^2)^2+b^4)$. And I seem to have an error that I cannot detect. Using ...
0
votes
1answer
20 views

solving a non linear (log-linear) recurrence relation

I'd like to solve the recurrence relation $$\begin{align*} f(n+1) &= 2 f(n)^2 h(n) \\ h(n+1) &= h(n) f(n) \\ f(2) & = h(2) = 2 \end{align*}$$ for an explicit solution for $h$ and $f$. So ...
1
vote
0answers
37 views

Why does DeleteDuplicatesBy fail?

This is a pretty straightforward code. I just want to delete duplicates based on the final entry in each row. I have evaluated very similar numbers with no problem. ...
7
votes
1answer
196 views

Data extraction from a picture of a graph

How can I extract data from this picture of a graph? i = Import["http://i.stack.imgur.com/Ac8m0.png"]; The caption of the picture reads: " Two-dimensional ...
3
votes
0answers
31 views

Hide Notebook scrollbars

Is it possible to hide the scrollbars from the notebook windows while still being able to use the mousewheel to scroll? Since I never click on the bars themselves they're just a waste of space. It's ...
0
votes
0answers
25 views

Easier way to input Dynamic matrix?

I've only been using MMA for a month, and I'm working on making interactive Linear Algebra examples that will be used online for students. Right now, for inputting numbers into a matrix, I've been ...
0
votes
1answer
55 views

Visualization problems [on hold]

I am visualizing 1-dimensional curves that are periodic. Due to periodicity, extending the domain should result in the curve being retraced and therefore remaining unchanged. This doesn't seem to be ...
0
votes
1answer
46 views

How can I get the differences of all elements of list? [duplicate]

I want to get the difference of all elements of a list for example: $L=\{1,2,3,4,5,6\}$ for any $i$ and $j$ $\in L$ return the differences, for example for the first element $1$ we get the difference ...
0
votes
0answers
29 views

Drawing Arrows to connect points from two separate data sets representing coordinates

I have 2 separate excel files that I'm importing into Mathematica. Each excel data file has numerous rows of data containing a coordinate of three columns (x,y,z). I have been able to plot these ...
0
votes
0answers
37 views

Henon Map Equation Trekker Error

I am trying to make an Equation Trekker for the Henon map in the following way: ...
3
votes
0answers
28 views

High CPU load for dynamic classification

I encountered some issues with extremely high CPU load when I tried to classify live images (using Dynamic and CurrentImage[]). ...
0
votes
0answers
47 views

Eigenenergies of a symmetric tridiagonal matrix [on hold]

we consider the time independent Schrodinger equation (TISH) where we want to calculate the first few instantaneous eigenergies. Discretizing space we get : So we can rewrite the TISH as, (where ...
0
votes
0answers
34 views

Simplify: Why does it miss this simple one?

I got a result with the expression ...
-1
votes
1answer
44 views

Sorting matrices by their norms

I have a matrices A and their Norms(Matrices B). I want to rank Matrices A based on their Norms. From smallest to highest Norm
4
votes
0answers
25 views

Pre-processing and deconvolution of CLSM images

I have some confocal laser scanning microscopy data sets that I want to binarize for further analyses. Due to the fast bleaching dyes and the general scanning duration we established a setup which ...
0
votes
1answer
41 views

Nested parameter selecting in Manipulate

I have the following code, stripped down from the original to the bare essentials: ...
2
votes
1answer
30 views

How to get Quantity to collect like terms?

In Mathematica numerical terms collect when their variables are equal. .2 "SERC" + .7 "SERC" (* 0.9 "SERC" *) However, numerical ...
-3
votes
0answers
52 views

Mathematica Bug with version 10.4.10 with OSX [on hold]

I have upgraded mathematica to 10.4.10 and OSX El Capitan version 10.11.4. On my desktop I use linux and mathematica version 9. I have a notebook on the desktop that run just fine ( I am solving ...
-1
votes
1answer
46 views

Comparison Graph

I want to draw the combine comparison graph of the following four sequences (note that two are approximatly equal), each one have different colors and lables etc AK ...
0
votes
0answers
47 views

Detection of blurry object

I have a series of very similar images (8bit gray-scale, png) where I track an object. The problem is that it is blurry and its brightness is comparable to the background. Below is the code how I am ...
1
vote
2answers
94 views

Making a 3D plot of $x\,y$ that looks like the one I get from Maple [on hold]

I made a 3D plot of $x\,y$ in Maple: plot3d(x*y, grid = [10, 10], color = "Red", style = pointline,axes = framed) How can I make the same graphic in ...
2
votes
0answers
33 views

Naive question on ODE numerical solving and periodic initial conditions

I have a second-order nonlinear ODE for which I would like to find a numerical solution, with periodic initial (boundary) conditions. Can this be done directly with ...
0
votes
1answer
32 views

Finding the magnitude a matrices [on hold]

I need some help. I have a list of 3 x 3 matrices of real numbers.I want to find how close each of these matrices are to a {{0,0,0},{0,0,0},{0,0,0}} matrix. Any suggestions to a method algorithm or ...
-1
votes
0answers
22 views

Expectation of Rician Distributed Data [on hold]

As you can see in the attached file, I'm trying to obtain the expectation of some Rician distributed symbolic data. However output and input are the same. I guess that happens because Mathematica is ...
3
votes
1answer
248 views

Strange behavior of StringReplace, same expression evaluated differently

I have two expressions which are exactly same: StringReplace["in the next few days", {"in" -> "ffdsf"}] and ...
0
votes
0answers
18 views

Interpolation function inside a numerical integral

Hello all and thanks in advance for your comments, I will be brief to explain my doubt. If you need any more information, please ask me. I have an interpolation function which comes from the ...
3
votes
1answer
81 views

Calculate area of apple from image

I want to find area of following apple I want to do something like this: define boundary region of apple apple=... then find area using only ...
-1
votes
0answers
26 views

Amelioration of a GraphPlot [on hold]

In the following graph ...
0
votes
1answer
37 views

2d numerical integration

I'm trying to get a numerical solution for a double integral: ...
0
votes
3answers
54 views

Derivative of a 2D Interpolating function

I cannot find a way to obtain the partial derivatives of a 2D Interpolating Function obtained with ListInterpolation. I didn't find anything useful on the web. Any ...
2
votes
1answer
44 views

Place Legend above Epilog

I am currently struggling with a problem which I haven't seen answered anywhere else. I want to make a ListDensityPlot graph in which I need to draw some ...
-1
votes
0answers
34 views

How to find vertice by two angles and side? [migrated]

I know 'alpha', 'betta', length 'c', vertices: 'A' and 'B' How can i find the 'C'?
0
votes
0answers
27 views

Shortest[] didn't work for StringReplace for shortest consistent match if whiteSpace involved [duplicate]

This is a problem related to How to use StringReplace "from bottom to global"? The answer of @J.M. works well for "<...>" styles : ...
-1
votes
0answers
18 views

Asked a question before signing up and can not sign in back [migrated]

Yesterday I asked my first question on mathematica.stackexchange, but being as an unregistered user at that moment. Then I confirmed my email and would like to express my gratitude and note the ...
5
votes
3answers
73 views
1
vote
1answer
57 views

RegionPlot with rank constraint

I am trying to plot the feasible region of a rank constrained semidefinite program shown below: The Mathematica code that I am using is the following: ...
1
vote
1answer
112 views

The new introduced EulerMatrix problem

In the present version of Mathematica, there is a new command EulerMatrix[{α, β, γ}])// MatrixForm I read its document and I still don't understand it. For me, ...
0
votes
1answer
44 views

Transforming Determinant to Polynomial Expression

I have determinant which equals zero. In determinant, i have x expressions. i want to transform the determinant to polynomial expression so i can solve that with mathematica. Note : Apologize for ...

15 30 50 per page