# All Questions

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### 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 ...
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### Mathematica Bug with version 10.4.10 with OSX

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 ...
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### 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 ...
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### 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 ...
51 views

### How to make $xy$ function graphic like maple

I plot $xy$ function in maple plot3d(x*y, grid = [10, 10], color = "Red", style = pointline,axes = framed) how to make same graphic in Mathematica? ...
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### 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 ...
22 views

### Finding the magnitude a matrices

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 ...
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### 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 ...
77 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 ...
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### 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 ...
19 views

### Amelioration of a GraphPlot

In the following graph ...
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### 2d numerical integration

I'm trying to get a numerical solution for a double integral: ...
22 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 ...
31 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 ...
25 views

### How to find vertice by two angles and side?

I know 'alpha', 'betta', length 'c', vertices: 'A' and 'B' How can i find the 'C'?
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### 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 : ...
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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 ...
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Observe: ...
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### 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: ...
98 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, ...
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### 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 ...
108 views

### Solving my graduation exam geometry problems with Mathematica [on hold]

How capable is Mathematica when it comes to typical school geometry problems? Is there a way to throw constraints at it and get it to spit out a solution? Here are two geometry problems from my ...
45 views

### Query or MapAt ragged associations or ignoring Missing values

Related to this question, can functions be mapped to named Keys in ragged lists of Associations? ...
31 views

### NDSolve for complex variables

I am trying to simulate a multiple pendulum system with damping as follows: ...
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### Using Associations and Pattern matching in numerical functions broken

It looks like the very young feature of pattern matching (/replacing) within Associations (http://mathematica.stackexchange.com/a/119542/6804), with or without ...
39 views

### Integration of a function of interpolating functions

I need to calculate the integral of a function of interpolating functions. Being more specific, the function I want to integrate is the following ...
41 views

### Find a specific function in several notebooks

I searched several questions in this forum about: How to search a specific function ... For example, I have a folder with several notebooks. And several of these notebooks, I used, for instance, <...
315 views

### How to color the edges of a triangle?

I'd like to draw a triangle (given the side lengths) with the sides colored separately. I tried ...
47 views

### Association matching still not working perfectly?

Up until 10.4 you could not match on internal Association structure at all: http://mathematica.stackexchange.com/a/119542/6804 Now you can, but it seems flawed ...
496 views

### Graphics of Ebbinghaus illusion

I define two graphics for Ebbinghaus illusion ...
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### Finding Real Roots and Determining Range

I am interested in determining the minimum and maximum values of the real roots of polynomials of form $P(x)=\sum_{k=0}^n a_{k} x^k$ where $n$ will have a defined value (say 3,4,5...) and $a_k$ are ...
51 views

### StringSplit on comma but ignore commas in quotes

I'm importing CSV files and some of the fields include quoted text with commas as part of the field, rather than as a field separator. What is the syntax (or alternative method entirely) to import ...
77 views

### NonlinearModelFit with indexed parameters

I have an instrument calibration problem for a multi-channel instrument. Some of the calibration parameters are common between channels, while others are per-channel. Toy example: ...
50 views

### Adding a random shock to a sine wave [on hold]

I have the following sine wave generated: Plot[Sin[2 Pi*x], {x, 0, 1}] How can I add a random value to this function generated from the Guassian distribution?
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### Cross product between two lists of vectors

I'm trying to create a function that does the cross product between two lists of the same dimensions, element by element. Each entry of the list is a 3D vector. Something like this: ...
36 views

### Graphics3D and Postscript

When trying to export a figure with Graphics3D to postscript, I get abysmal results seen in the attached image. The image on the left is what I see in Mathematica. The image on the right is the ...
51 views

### Waveguide along a curve

I have a parametric equation of the curve and several moving frames on it. I would like to move some cross-section (not circular) along the curve with respect to the normals of the frame. E.g. let the ...
53 views

### Get slope of linear fit

This may seem silly, but I've been crazy for the last hour trying to find a way to automate the linear fit of my data. All I need is the slope. Say I have some data ...
29 views

### How to manipulate this? [duplicate]

I tried to code this, but everytime I code I failed. Im not sure what I did wrong and Im fairly new to Mathematica. Can you guys check it out? ...
32 views

### Converting a string into a formatted data (to create bibitem from .bib file)

Say I have a string like this ...
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### Transform an expression into a function [on hold]

I have a matrix of the form Mat = {{2a, 7a},{5a, 3a},{a, 2a}} (the actual matrix is a hugely complicated one of size 64x64, but the idea is exactly the same). I ...
60 views

### Einstein summation and traditional form of partial derivative of implicit function

I am quite new in Mathematica (1 week new) and after many trials I did not manage to make my partial derivatives to look traditional way. There are few topics such as How to make traditional output ...
55 views

### Can Mathematica solve inverse laplace transform

Laplace transform is $\mathcal{L}(s)=\exp(-2 \pi s^{1/a}\int_{0}^{y/(s)^{1/a}} \frac{x}{1+x^a}dx )$ Do i solve inverse Laplace transform of $\mathcal{L}(s)$ or $\mathcal{L}^{-1}(s)$ or \$\mathcal{L}(...
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### ListAnimate — restore frames to original position after interaction during a pause

I have a ListAnimate where the frames consist of graphics made of lines and points. I want to make sure that, when the animation is paused and then resumed, all ...
21 views

### Make a .C3D file in Mathematica

I have two different groups of points in an excel file, which are captured by two different cameras from two different angles (Motion Capture Process). These points are extracted by using markers on a ...
54 views

### Setting up teams to play in games [on hold]

Imagine there are 12 teams, numbered 1 through 12. There are 10 games those teams can compete in, with two teams needed per game. There are 10 rounds, and it is important that after the 10 rounds are ...