# All Questions

59 views

### White spots in ListDensityPlot

I have a problem with ListDensityPlot. I have some data on an irregular grid. I try to plot them with ...
54 views

### Recurrence equations with periodic coefficient

Suppose I have the following recurrence equation: $$F_{i+1}P_{i+1}+F_iP_i-P_{i+1}+P_i=2J\,, \quad\textrm{with}\quad F_{i+L}=F_i,P_{i+L}=P_i\,.$$ $J$ is constant, $\{P_i\}$ are probabilities with ...
66 views

### Reduced Planck constant and UnitConvert to Erg * Second

I declared the reduced Planck constant by ℏ = Quantity[1, "hbar"] which worked. Now I want to calculate something in cgs units. Therefore, I tried to convert ...
355 views
+50

### Digital filter of image in Fourier space

Consider the contour plot below, of a function f(x,y) - which is calculated numerically by solving some equations. If one looks carefully, one can observe two types of waves, to the left and right of ...
74 views

### Write a function using pattern test to test whether the input is polynomial and print error message if not

I am doing this which is supposed to be an easy problem and which I think my code should be correct but for some reasons it is not working. May anyone help correcting my mistakes? How should I write ...
78 views

### Plotting rainbow circle [duplicate]

I am trying to plot a parametric circle in rainbow colors. It should go round once, but I'd like to be able to make it go round the rainbow an arbitrary amount of times. I currently have: ...
35 views

### Simplifying Expressions to minimize multiplications [duplicate]

I have a big matrix, whose coefficients mostly have the following form: 2*(Lz*q*q0+Ly*p*q2-Lx*q*q2+Lz*p*q3-Ly*q0*r-Lx*q3*r) This was obtained with Simplify, with ...
46 views

### Find leading-order asymptotic approximatons to the solution of epsilon y''+Cosh[x]y'- y == 0

I am trying to solve this boundary value problem and obtain the leading-order approximations using asymptotic matching. But I got my solution wrong and I am stuck along the way, struggling to find any ...
77 views

### Find elements of a list which are empty

Sorry for the most basic of questions. How would I find the positions of a list of elements which are empty, for example I have the list ...
50 views

### How can I control the controlplacement of Manipulate?

I want to place the Slider of manipulate as I want but I can't, help me to get rid of it ...
74 views

### Solution of equation with power series (perturbation)

So I need to use Mathematica to find the solution of $y=x- \epsilon \sin(2y)$ as a power series in terms of $\epsilon$. I'd assume I'd need to create an equation $f=x-y- \epsilon \sin(2y)$, then ...
34 views

### Changing GeometricBrownianMotionProcess function

Since the function GeometricBrownianMotionProcess is given by Mathematica I have some technical questions. If we consider the following example: ...
61 views

### Rounding only reals in an expression containing, reals, integers and symbols

I am trying to make a function that would make rounding real numbers in an expression possibly consisting of real numbers, integer numbers and symbols. An example of such an expression is below: ...
39 views

### How can I make images in the cell auto-adjust to some fixed-size

There is one auto-adjust item in the right-click menu of image in cell. And other related items are actual size and ...
152 views

### Aligning axes labels on multiple plots

I'm trying to create some "publication quality" figures, but Mathematica is fighting me all the way. So my question is: Should I switch to Origin? Please help! Well, all joking aside: I'm trying to ...
140 views

### Mathematica 9 can't integrate this function but earlier versions could

Integrate[ ArcTan[x]/(1 + x) Log[(1 + x^2)/2], {x, -1, 1}] I used Mathematica 9.0.1 on Windows7 32bit, Mathematica 9 cannot compute this, but Mathematica 8 gives ...
81 views

### label all vertices in polygon plot

Let's say I have the following plot Graphics[{Opacity[0.2], Rectangle[{0, 0}, {4, 4}]}] And I want to label all vertices on the graph to give their coordinates, in ...
519 views

### Why are my plots displaying behind the axes?

I need to create graphs with light gray axes and black lines. All of my plots display behind the axes. How can I make the plots display over the axes? ...
68 views

### Parametric Plot of coupled differential equations

I am able to plot a graph of all the differential equations, but I'd like a parametric plot of each individual one. Here is what I have so far. ...
176 views

### Create polygon using edge lengths and area

Four-sided convex land plots are usually denoted with edge lengths and area. How do I create a Polygon Object with these parameters in Mathematica ?
46 views

### Interpretation of output derivative expression [duplicate]

I am trying to write Mathematica file to find Div, Grad, Laplacian, etc. in coordinates ...
67 views

63 views

### How to forward the Mathematica values from one page to another jsp page?

I have four jsp files like oneMain.jsp, twoMain.jsp, threeMain.jsp and four.jsp based upon DB data I forward the name threeMain.jsp or fourMain.jsp from oneMain.jsp ...
134 views

### Little problem with Through

list = Partition[Range[20], 5, 5, 1, {}] {{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}, {11, 12, 13, 14, 15}, {16, 17, 18, 19, 20}} ...
102 views

### Maximizing trig functions in Mathematica

Just to give some context, my motivation for this programming question is to understand the derivation of the CSHS inequality and basically entails maximizing the following function: ...
115 views

### Finessing labels in BarChart

BarChart is aggravating. Why don't the following correctly display both percentages and labels? (1) ...
77 views

### Equating two lists, element by element

Say you have two lists: listA = {a, b, c} listB = {d, e, f} How would you produce a listC that equates each of the two's ...