# All Questions

38 views

### Two problems with NDSolve when using Method -> Projection

I tried to solve a system first order differential equations together with a constraint equation. I use the Method -> Projection to check if the constraint holds ...
74 views

### Window ▶ Show Handwriting Input

How might I force Mathematica to display the Handwriting Input menu? Currently I'm on W7 using a Wacom Tablet and unable to find the Handwriting Input option. It doesn't display under Windows>.
214 views

### How to count the integer grid numbers defined by inequalities?

I have the following code to show a red area defined by inequalities: ...
255 views

### DSolve not finding solution I expected

Try to solve the following ODE via DSolve \left\{\begin{aligned} y'(x)+2 y(x) e^x-y(x)^2 &= e^{2 x}+e^x \\ y'(0) &=1 \end{aligned}\right. The ...
41 views

### Lightweight Grid preferences screen stopped working after v10 install

I am getting the following error when I try to open the Lightweight Grid "Preferences" tab... ...
96 views

### May I restrict caching to disk when memory runs low? [duplicate]

An hour ago, I had to hard reset my laptop again because Mathematica froze the system again. When import a large file or make a mistake that produces huge arrays with complicated entries etc., I often ...
292 views

### Make MapIndexed listable

My goal is to apply MapIndexed to every element of a nested list without destroying the arithmetic operations within the elements. For example, let's start with ...
54 views

### How to use the output we see of expression when this expression is inside Dynamic

Consider this example: Manipulate[status = Dynamic[If[a < b, Yes, No]], {a, 2}, {b, 5}] The output of this calculation is ...
620 views

### Computing 10-dimensional volume of a 9-sphere [closed]

I'm trying to compute 10-dimensional volume of a 9-sphere with radius r using Monte Carlo. ...
73 views

### On using DiracDelta[t] in OutputResposne in version 10. Different result from version 9

I am baffled by this. I was trying to run same example I had working in version 9.01 and found now I get empty plots. The example is here . Here is a simplified version of the above. The same exact ...
37 views

### Connect to Windows kernel from Linux computer

I've seen many questions regarding the connection to a Linux machine from a Windows one, but I need to do the opposite. Situation: I have Mathematica on my Linux laptop (...
134 views

### Is it possible to insert new colour schemes into ColorData?

Because of the standards in my field, for many plots I need to use (or at least end up using) rather narrowly defined colour schemes, and in particular the Matlab "Jet" scheme, which is well described ...
151 views

### Different results with DateRange and LeapYearsQ in Mathematica 9 and 10

With Mathematica 9.0 for Mac OS X x86 (64-bit) (January 24, 2013) one could use DateRange[{2000}, {2010}, "Year"] to achive ...
45 views

### Disable Input Assistant Mathematica 10 [duplicate]

In the new Mathematica 10, every time I hover over a function for more than 0.001 second, this stupid box appears. In Mathematica 9, I had disabled it. However, no matter what I change in the ...
107 views

### How to vary line thickness to add a sense of perspective?

Is there a simple way to vary the line thickness relative to the viewpoint so as to add a sense of perspective? Take for example the following: ...
52 views

### Calculate the power spectral density of a Markov chain

I would like to calculate the symbolic power spectral density of a two state Markov process with a symbolic transition matrix characterised by two parameters. I have tried the below, but it doesn't ...
38 views

### NDSolve::derarg error: requiring pure function in solving differential equations

I'm trying to numerically solve 2 partial differential equations eq1 and eq2 given the boundary conditions in ...
242 views

### Map of United States as a 3D histogram

By combining the state data from here and the extrusion code from here I have managed to make prisms of the various US states such as However, the extrusion method looses information about the ...
70 views

### How to apply a trigonometric identity to a formula

The product of cosines is given by (Wikipedia): $\prod_{k=1}^{n} \cos{\theta_k} = \frac{1}{2^n}\sum_{e\in S} \cos(e_1\theta_1+\ldots+e_n\theta_n)$ where $S={1,-1}^n$. How can I apply this to a ...
87 views

### Automatically add appropriate prefix to Quantity

Is there a function that automatically adds the appropriate prefix to a Quantity object? For example, I would like a function ...
243 views

### FullSimplify giving unexpected result

When I perform a FullSimplify on the list $$\left\{-\sqrt{5-2 \sqrt{6}},\sqrt{5-2 \sqrt{6}},-\sqrt{5+2 \sqrt{6}},\sqrt{5+2 \sqrt{6}}\right\}$$ I get  ...
84 views

### Expectation of a composite Markov-Gamma distribution

In a model I have a discrete two-state first order Markov process, defined by a (2x2) transition matrix with two free parameters. If the first state occurs then the process outputs zero for that ...
44 views

### How to write the following quadratic equation in general form? [closed]

Write the quadratic equation in general form: 1. x^2=16x 2. 13-3(x+7)^2=0 3. x(x+2)=5x^2+1
204 views

### How can I get the function of a plotted trajectory? [closed]

I solved two ODEs, which are a function of t, numerically. The first ODE is the vertical equation of motion and the second one is the horizontal equation of that ...
62 views

### Is it possible to add page break in front-end? [closed]

Description: I have accomplished my undergraduate paper as a Mathematica notebook. In this condition, I find it convenient to typeset formula and words in a notebook environment. However, I feel ...
43 views

### How to expand set of fonts for mathkernel.exe?

If I am running standard Mathematica and I am choosing from the menu Format->Font, I've got everything I need. All necessary scripts are present (Western, Central European,etc.). Whereas If I run ...
75 views

### Non-linear curve fitting with multiple parameters and conditional expression

The above integral(Bloch Gruneissen formula) is what i like to fit with my experimental data.I am new to Mathematica. To cross-check the fit results obtained in other software, I try to fit with my ...
115 views

### The i-th element of a permutation [duplicate]

I am trying to run something of the form ...
73 views

### Attaching functions to movable locators

I'm trying to create a manipulate plot showing the electric field due to a collection of point charges. At the moment I've created such a plot which allows the x and y positions of each charge to be ...
88 views

### How to tell NDSolve about known relations of the exact solution

The solution to this system of differential equations: ...
89 views

### Convex hull of a large data set of 3D points

I recently needed to deal with a large data set of 600.000 points in three dimensions. My task was to find a convex hull for this data. I have Mathematica 10, so I could use the function ...
248 views

### Torus triangulation

I'd like to plot something similar to this but with a triangle instead of a pentagon. Also, I'd like to triangulate the faces, that is, to insert the diagonals for each face of the 3 prisms used. In ...
669 views

### To inscribe a circle in a given triangle

I am trying to to inscribe a circle in a given triangle but it isn't working. I've used GeoGebra with this construction and worked but as I'm new to Mathematica I am missing something. It can't be so ...
62 views

I am trying to understand EXACTLY what the GradientFilter function in Mathematica is doing. As far as I can tell, it appears to be doing a convolution of a first derivative of a Gaussian with the ...
114 views

### Export Grayscale Bitmap

I have a grayscale (one channel) image in Mathematica. How can I export it as a grayscale Bitmap? Every single option I tried so far does not have an influence on the Bitmap exported using ...
77 views

### ArrayPlot copied to PDF shows blurred mesh

Certain (but not all) images displayed in ArrayPlot, and then copied to PDF, show what appear to be fuzzy mesh lines in white areas. An example is shown below. I ...
85 views

### Customizing display of partial differential equations

I am manipulating partial differential equations symbolically, and would like to get the easily readable form $\rho \frac{\partial v}{\partial t}$, leaving variables implicit. Based on suggestions ...
77 views

### How to get matching starting dates for different FinancialData properties? [closed]

Why do the "Return" and "Volume" outputs of FinancialData differ? Consider the following ...
437 views

### How to combine one or more rotated graphics objects?

I wish to produce an image with more than one composite graphics objects which have been modified using Rotate. I feel this should not be difficult, but haven't yet found a solution. A simple example ...
97 views

### Passing a variable messages list to Quiet

I'm trying to build a Verbose option into some code but I'm having trouble passing to a Quiet statement a variable list of which messages I want to suppress. My ...
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205 views

### Why isn't Lookup treated like other symbols?

With Mathematica 10, I wanted to overload Lookup using TagSetDelayed, but it doesn't work. For instance, if I define two objects ...
60 views

### Installing R packages using RLink on Mac OS X

Is there any updates regarding installing CRAN packages via RLink in Mathematica 10 on Mac OS X? Or are we still stuck with the base R package and that's it? I was able to point to my R distribution ...
67 views

### How to define a nestable Baseform function, BaseForm output becomes BaseForm input

Mathematica won't change a number's BaseForm recursively: 63969 // BaseForm[#, 16] & // BaseForm[#, 8] & // BaseForm[#, 2] & Well, I inspected former ...
68 views

### V10 interface problems

Has anyone noticed the following? Sometimes when I bring up the Help->Wolfram Documentation there is no text field to type into. When I bring up Find and Replace there are two text fields for Find: ...
131 views

### Example of Integrate applying a numerical evaluation N

Here is a minimal example: Integrate[(a[1] + x)^2, {x, 1., 2.}] 2.33333 + 3. a[1.] + 1. a[1.]^2 The problem is that ...
89 views

### How do I write “such that” in mathematica? [closed]

I have a mathematical statement as follows : Tri := {(t1,t2): t1,t2>=0,t1+t2<=1} How can I tell Mathematica that I need to define vectors (t1,t2) 'such ...
81 views

### Laplace: from differential equation to transfer function

First at all, this is trictly related to my own question: How to transform transfer functions into differential equations? How can I transfer my differential equation into a transfer function? For ...
### Solving $L=\frac{3}{2} \sqrt{4 \pi ^2 A^2+W^2}-\frac{\sqrt{5 W \sqrt{4 \pi ^2 A^2+W^2}+6 \pi ^2 A^2+3 W^2}}{\sqrt{2}}+\frac{3 W}{2}$ for $W$
When I solve the aforementioned equation for $W$ or $A$ on Mathematica I get a long and ugly equation in return, namely one of the solutions for $W$ is: (attempt to read at your own health) ...