# All Questions

102 views

### how to find curve fitting parameters without an explicit relation between x and y?

Let's say I have some experimental data (x,y) and I want to find some fitting parameters. But in my mathematical model, the fitting parameter are not in a simple equation that relates x and y. For ...
64 views

### Logic Gates - How to show eight ways an AND function can be realized using negative and postivie logic [closed]

I am asked to use negative and positive logic (using bubbles on the gates) to show eight ways that an AND function can be realized. Im not too sure how to do this. The only way I can create an AND ...
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### Overlap an image in real time

I made a real-time face detector with Mathematica, and I want to put an image where it detects the face. Here is my code: ...
76 views

### Select From List of Nested Associations

I have an association: ...
68 views

### Code turns dark blue after trying to run it [closed]

I have a large amount of data in my N-Body Code. I imagine Mathematica doesn't really like this, but is there any other reason for my code turning a navy blue colour after I try to run it?
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114 views

### Solving a second order non-linear differential equation

I am trying to solve the following equation DSolve[{u''[t] + 4 u[t] + 0.1 u[t]^3 u'[t] ^2 == 0, u[0] == 1, u'[0] == 1}, u, t] Unfortunately Mathematica is ...
26 views

### How to Insert Page Break at end of Repeating Block with “Evaluate and Delete”?

This is with version 10.0.2 I have simple notebook template to generate some bingo cards. I would like to have them print two to a page. However, no matter what I do with the page break it will not ...
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### Discretizing regions with pointy boundaries

I'm trying to discretize a region with "pointy" boundaries to study dielectric breaking on electrodes with pointy surfaces. So far I've tried 3 types of boundaries, but the meshing functions stall ...
149 views

### How to save all notebook outputs as pdf file

I have produced a lot of graphs and tables in my notebook. I am trying to save all these outputs as pdf file. As we know form Rodney and form Mr. Wizard , we can not use save as function. I have ...
72 views

### Expand a fitting using FindFit[]

I need to implement multidimensional optimization using FindFit[]. But it's essential to exclude some parameters from the main procedure of optimization and to move on from direct optimization in ...
36 views

### How many CPUs does gridMathematica support?

In the features section it is written that: gridMathematica is an integrated extension system for increasing the power of your Mathematica licenses. gridMathematica Server gives Mathematica users ...
238 views

### Label multiple edges between same vertices

I have a simple graph with multiple edges between two vertices, say: Graph[{ Labeled[a -> b, "A"], Labeled[a -> b, "B"] }] Unfortunately, Mathematica ...
205 views

### Filling to Axis as Arrow

In version 9 I could do the following with the output as shown. ...
44 views

### How to input a dynamically changing parameter in NDSolve? [closed]

I am trying to solve a system of DEs with additional conditions, and one condition depends on a parameter. Let us consider the following example: ...
63 views

### Simplification of algebraic expression

I found an entry of a matrix from two different methods using mathematica. Which are given as; g/(Sqrt[2] Sqrt[1 + g^2 - Sqrt[1 + g^2]]) and ...
163 views

### Using DiscretePlot to graph the Riemann sum of a parabola

I want to graph the Riemann sum (upper sum) of $y=x^2$ with $1\leq x\leq 4$ using 6 rectangles. I want the rectangles to be green. On the Wolfram Mathworld website, I can render exactly what I want ...
38 views

### Define column types in a Dataset - Failure on append and Typesystem

I have a basic function that populates a Dataset according to user specified parameters. ...
135 views

### How to apply # on different lists? [duplicate]

If I have list1 = {1, 2, 3, 4} list2 = {5, 6, 7, 8} How can I do so, that function[#1, #2] takes ...
96 views

### PDE: Solving Burgers' equation with initial value given by a self consistency equation

I would like to solve in Mathematica the well known inviscid Burgers' equation \begin{align} \begin{cases} u_t(x,t) + u(x,t)u_x(x,t)= 0 \\ u(x,0) = m(x) \end{cases} \end{align} where m(x) ...
54 views

### Get the path of the Image in Mathematica

When copying the Image from the hard drive to the Mathematica notebook, what can I do to have the path of the Image? I tried Imort[img] // Path where ...
181 views

### Incorrect evaluation of integral involving a DiracDelta, whose argument has infinitely many zeros

Let's say $X>0$ is a random variable with probability density $p_X(x)={\rm e}^{-x}$. Define the random variable $Y=\sin(X)$. From the transformation theorem for probabilities we know that its ...
40 views

### Independent Set Sorting

Let's say I have a graph g, and I wanted the largest independent vertex set of g. I would write then, ...
80 views

### Controlling the size of Histogram in PlotLegends -> Histogram

I stumbled across this in the Mathematica documentation and thought it was pretty nifty except that the Histogram that appears as the plot legend is too small so the numbers on the histogram overwrite ...
44 views

### cut and project tilings — Amman Beenker tilings

A certain research paper gives a recipe for building Amman-Beenker tilings as a special type of cut-and-project algorithm. The result is usually a pleasant kind of aperiodic tiling shape. The ...
92 views

### Display level of recursion of a recursive function during execution

Given a recursive function, is there some simple way to display or store the value of recursion or "how many levels deep" the function is at a given time? For instance, if we wrote the recursive ...
50 views

### Embed 3D objects from Mathematica, in a pdf

Acrobat Reader 9+ supports interactive manipulation of 3D objects. See this file for example - another widely used example are PRC objects which may be produced by Asymptote. Exporting animations ...
122 views

### Solving 2-D Mechanical Systems

I'm trying to use Mathematica to solve a particular 2-d mechanical system. The system comes from "DESIGN AND OPTIMIZATION OF AN EIGHT-BAR LEGGED WALKING MECHANISM IMITATING A KINETIC SCULPTURE, “WIND ...
72 views

### Strange timings of integrals involving Hermite's polynomials

I have used Mathematica to calculate tunneling for quantum harmonic oscillator. The code is simple: ...
55 views

### How to convert expression with Subscript to string

I've tried ToString[], but it doesn't work properly with subscripts: How to convert expr with subscript to string with exactly the same FullForm that "expr" has?
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### how to create Panel for Plot?

Can You advice me how to put the whole thing below into an interactive Panel, so I can values of parameters dynamically - type other values (alpha, beta, x0, y0, R, tmax) and plot updates ...
41 views

### About installing Mathematica on Ubuntu 14.04 LTS

I followed the first set of instructions here to install it from a ".sh" file, http://support.wolfram.com/kb/12453 At Step 4 and 5 I chose the folder "~/Desktop/Mathematica" as the folder to create ...
104 views

### Creating a right hand in graphics3d to illustrate the right hand rule

I would like to make a small right hand with fingers that curl to illustrate the right hand rule in graphics3d. Does anyone know if this is possible? For an example of what I'm looking to plot, see ...
41 views

### Refercing generic derivatives

I have a list of rules to the values of the derivatives of a generic (real valued, 3 variables) function, for example: df/dxdydz(0,0,0)-> 0.7. I would like to be able to generically reference this ...
62 views

### ListContourPlot: Not all labels are shown

I am trying to create a contour plot for the data I have, and I want to show all the labels on the plot but I am getting only 3 labels using ContourLabels, how can ...
135 views

### Getting terms and only evaluate specific parts

I want to expand the expression but I do not want it to evaluate. Sum[(HoldForm[1/(2 # - 1) - 1/(2 # + 1)] &)[i], {i, 1, 6}] However if you evaluate this you ...
56 views

### How to create a custom filling with ListPlot

We have the following simple example ...
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### Export Time-dependent STL Graphics

I have recently found that Mathematica may export files (.stl) which may be used for Blender (3D pictures and animations). However, I am interested in mathematics visualization, and I suppose that ...
53 views

### How to combine multiple rules? [closed]

I have 2 rules: Rule[#, SomeFunction[#]] &/@ SomeFunctionArgs; Rule[#, OtherFunction[#]] &/@ OtherFunctionArgs; I want to have one function that combines ...
66 views

### How to make the result of Piecewise be a closed interval?

Description This question comes from two questions. Namely Q1 and Q2 The defintion of B-Spline basis function as shown below: Let $\vec{U}=\{u_0,u_1,\ldots,u_m\}$ a nondecreasing sequence of real ...
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### ListPlot3D with the color choosen from another list [closed]

I have a data set for doing a ListPlot3D in the required format as data={{x1,y1,z1},{x2,y2,z2}......{xN,yN,zN}}. I also have another list with N values ...
52 views

### Integrating a compound expression

I have an integral of the form I[r]=∫(arExp[-r]-brSin[k(r-d)]Exp[-r])BesselJ[0,kr]dr where Besse1J[0,kr] is the modified ...
71 views

### map of Europe as histogram

I want to make a histogram using the map of Europe, such as this or similar: thanks to all
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### Initiating another Kernel?

How can I start a separate kernel to do other work, while I have Mathematica working on a problem that requires lots of computation time? I have a program that must be run for many hours, preventing ...
83 views

### Parsing string with nested information

I am trying to parse a string, but I have no idea how to solve the following problem ...