# All Questions

71 views

### How to define a custom template for entering a partial derivative?

I want to define a custom template for entering a partial derivative. For example, When I press ctrl + shift+', I want to get To make my template, I followed a previous solution that made a ...
347 views

### Gaps in simple plot

I am trying to recreate this which should be fairly straightforward with ParametricPlot, but wondering why this doesn't work: ...
639 views

### How to set icon for Mathematica in Ubuntu Linux?

I installed Mathematica 9 and 10 on Ubuntu Linux 14.04 with Unity. How to set icons for them? At the moment they show up as gray squares with a question mark in it on the dock.
144 views

### Plot some ordered pairs on the Cartesian plane? [closed]

Can Mathematica show me a coordinate grid ( x-y plane) with some ordered pairs plotted on the plane? Or even better, some complex numbers represented as vectors on the real-imaginary plane.
50 views

### Generate a list of values of a function for each value of the parameters already found

The following question is an extension of this question Find all roots of a function with parabolic cylinder functions in a range of the variable. Now I want to use the roots found to calculate a ...
143 views

### How to save all images in GraphicsGrid?

I have a 2X2 images. How to save all the images at once while using GraphicsGrid ? when I try the save graphic option only one image is saved
97 views

### Solving non-linear ODE analytically in mathematica [closed]

I would like to solve the following differential equations $${dx\over dt}=\beta x-{{(C-x)^2}\over 4k} ,t\in[0, T]$$ where $\beta$,$C$ and $k$ are constant values. Also, the folowing terminal ...
184 views

### Optimize evaluation time for a Quantum Walk simulation

Here's the problem. I'm trying to simulate a noisy Quantum Walk to obtain results similar to these, experimentally obtained. I wrote my code, and I get results which are in accordance to what I ...
76 views

### Ctrl+= does not open a box

In the guide/WolframAlphaIntegration documentation it says that = : use free-form linguistics to generate Wolfram Language output ==: generate full Wolfram|Alpha ...
139 views

### Convert spreadsheet (Excel) to *.csv during import

I have long lists of data in spreadsheets and have the problem that Mathematica crashes regularly during import of the .xlsx files. Is it possible within Mathematica to take a certain tab of a .xlsx ...
1k views

### How to remove brackets from this list? [closed]

I have some lists which have many brackets. I'd like to remove brackets from the lists. For example, I need to change the list ...
1k views

### Does Mathematica have a built-in tool that allows one to operate on both sides of an equation?

Geogebra has a very neat CAS view that allows one to solve an equation step by step in the following fashion: $\quad \quad \quad \quad \quad \quad \quad \quad \quad$ You type an equation and ...
77 views

### Inverse Laplace computation Mathematica [closed]

I have a transfer function such as following, which I would like to find its inverse: F=(a*s^2)/(b*s^3+c*s^2+d*s+e) I have a numeric value for a b c d and e but ...
327 views

### contour plot (cartesian) using spherical coordinates postions

Let´s say that I have a data in the following configuration: { Lat, Long,distance, energy}-> lat, long -> galactic coordinates, distance unit - parsecs (3.2 ly) energy unit- ergs. I need to plot ...
30 views

### autocomplete or forward search input histories

I think there are many bash users here. In bash, a forward search of input histories can be done by Ctrl+r, which let you edit your previous similar input and reuse it. Is there a similar function in ...
106 views

### Defining an arbitrary binary relation

I am trying to define some binary operators. A binary operator operates on a set of variables V and is defined by a subset S of pairs of those variables {Vi,Vj}. For example, "=",">",">=" are all ...
96 views

### Reduce with for all and implies

I have the following question. p1 = a (1 - c + a) p2 = b (1 - c - b)/((1 - b)^2) v1 = (x^1.5 - 3*x)*p1 v2 = x*p2 I want to find x ranges which makes v1>v2 under ...
574 views

### Solve a trig equation system

Background of the problem In the same plane, P is a fixed point, A,B,C are moving point, PA=a, PB=b, PC=c, find the maximize perimeter of △ABC. let ∠BPC=A, ∠CPA=B, ∠APB=2*Pi-A-B, then the perimeter ...
173 views

### Undo (CTRL Z as well as under edit) bug after pressing control shift [duplicate]

Bug introduced in 10.0 and fixed in 10.0.2 As some of you might know, if you press control + shift on windows, you change your keyboard layout. For example, : becomes ±. This happens sometimes in ...
113 views

### Efficient extraction of a subset

The context is molecular dynamics. The data is in the format (index_1, index_2, distance). The goal is to find all of the distances to the neighbors of point index_0 and to present a set listing the ...
297 views

### NMinimize with NIntegrate (crash in symbolic evaluation, memory leak)

This is a "common" problem from what I've seen, but with a different spin. I have a function I use often that finds a fit of an expression to another expression with some free parameters (e.g. for ...
331 views

### Manipulate code crashes V10.1

This code is working with Mathematica 9, but Mathematica 10.1 is becomes unresponsive when I try to evaluate it. ...
48 views

### Why does NSolve not solve this system of equations on a bounded domain? [duplicate]

I have three functions $E1,E2,E3$ of $t1$ and $t2$. The expressions are slightly complicated and involve trigonometric functions. For clarity purpose, they are given at the end of the question. I wan'...
76 views

### Quotes vs No Quotes for Association Keys

I've tended to not put quotes around the names of my Key when making Associations. For example: ...
143 views

### How to calculate residues using different branches of the logarithm

My goal is to be able to compute the residues of something like $z^{\alpha} R(z)$ where $0 < \alpha < 1$, $R(z)$ is rational, and the exponential can be chosen with any branch. I found a way to ...
244 views

### Merging lists of pairs [duplicate]

I want to add several fluorescence spectra. They are lists of the format ...
201 views

### How to produce a matrix plot from 3 matrices a, b and c following RGBColor[a[[i,j]],b[[i,j]],c[[i,j]]]?

I am trying to produce a single-plot from 3 matrices, let's say: ...
111 views

### ParametricNDSolveValue has a problem with complex numbers

Bug introduced in version 10 and fixed in 10.3 Edited: I have simplified the example compared to before and narrowed the problem down a bit. I would like to use ...
268 views

### Evaluating a Series expansion of PolyLog function

I am trying to evaluate an expansion of the following integral $$\int_0^\infty \frac{p^4}{1+\exp\left({\frac{p^2}{2mT} - \frac{\mu}{T}}\right)}\, dp = A_0(m,\mu) + A_2(m,\mu)T^2 + \ldots$$ in terms ...
254 views

### Find all roots of a function with parabolic cylinder functions in a range of the variable

I want to find all roots of a function involving Parabolic Cylinder Functions. In what follows, I define 2 variables $\xi1$ and $\xi2$, which in turn depend on $\omega$. My function is then defined as ...
77 views

### What is the role of the pattern object in this implementation?

In the documentation I found a nice idiom which allows me to do model fitting with interpolating functions. I think this kind of thing is amazing and a credit to the utility of an environment like ...
139 views

### Finding self-intersections of a closed curve represented by an interpolation function

I've been trying to find particular simple closed curves on a plane. ...
120 views

### Reference to multiple stylesheets

I need to set StyleDefinitions for a notebook in such manner so I can provide references to multiple stylesheets: ...
58 views

### Bounds of a closed curve

how to find the rectangular bounds of a curve which is of the form f(x,y) and forms a closed loop. The sides of the rectangle are parallel to the axes and are tangents to the curve. The time taken for ...
214 views

### Trouble with differential equation

I tried to solve this differential equation: $$\epsilon y''(x)+xy'(x)=-\epsilon \pi^2 \cos(\pi x)-\pi x\sin(\pi x)$$ with boundary conditions: $y(-1)=-2, \space y(1)=0$. If we take $\epsilon=0.1$, ...
80 views

### Turning powers into an explicit product

I have the following nested list {{yy[1, 4] yy[2, 7]}, {yy[2, 5]^2}, {1}, {yy[1, 5]^3 yy[2, 3]^2}} with objects yy[#1,#2] and I wish to get rid of the powers ^...
142 views

### Can I disable specific items in a PopupMenu control?

I have a PopupMenu in a Manipulate with items in it that are inapplicable in some cases, and rather than removing them, I would ...
194 views

### Query in Lists Mathematica - Pivot table

Recently, I finished a simulation, and I got the following data: ...
174 views

### Symbolic cut-off of high-order terms

I know that I can cut-off high-order terms of a $1$-variable polynomial P = a0 + a1*x + a2*x^2 + a3*x^3 + a4*x^4 + a5*x^5; simply by doing for example ...
158 views

### How to filter list of list of rules on certain condition?

For example, Solve[] returns all solutions as a list of list of rules. And mine looks something like this: ...
85 views

73 views

### Sum of Integers with a Pure Function

How would I find the sum of an argument, with the constraint that they are all integers (so if the argument contains a non-integer value, the function will not evaluate). I came up with these two: ...
317 views

### How to solve for the intersection points of two ellipses?

I have a parametric equation of two ellipses as follow $\begin{cases} x=a_1 \text{sin$\theta $}+b_1 \text{cos$\theta $}+c_1 \\ y=d_1 \text{sin$\theta $}+e_1 \text{cos$\theta \$}+f_1 \\ \end{cases}...
40 views

### Consistency between Enter keys

The notebook tutorial notes that Shift+Enter needs to be pressed to evaluate input; however, for the number pad, only Enter is required. It appears as though the use of Shift is inverted for the ...
141 views

### ToExpression in Manipulate

lets take this small example code: Manipulate[Plot[Sin[x (1 + a* x)], {x, 0, 6}], {a, 0, 100}, Button["a=90", ToExpression["a=90"]]] By clicking the button I ...
304 views

### Which IDE do you use for Mathematica development?

After more than a year I revisited the IntelliJIDEA plugin but that still seems to be 'just' an editor, of course there is the Mathematica Workbench but why are there so few improvements? Version 10. ...
120 views

### Mathematica is getting slow when repeatedly calling an external program

I found a strange phenomenon that Mathematica is getting slow when I repeatedly called an external program by using ReadList. For example, the following code will display a significant increase of CPU ...
79 views

### L1-Norm Minimization

I need the function for the L1-Norm Minimization problem formulated here https://reference.wolfram.com/language/tutorial/ConstrainedOptimizationLinearProgramming.html#261990371 ...