0
votes
2answers
67 views

Plot Bivariate Data with Marginals

I would like to plot bivariate data along with the marginal distributions. I've arranged the plots in a GraphicsGrid as below but the marginals are centered away from the bivariate plot and I wonder ...
1
vote
1answer
61 views

Misunderstanding the difference between Map Apply (@@@) and Map (/@) [duplicate]

Here's a minimal working example of a problem I'm having: ...
2
votes
3answers
87 views

Delete rows based on specific periods

I have data (.xlsx format): two columns - data in first column imported as DateObject (dates with specific time), data in second column are numbers (113388.28, 865165.98 etc.). I want to delete the ...
-3
votes
2answers
98 views

Catch and Throw command [duplicate]

I am trying to find the time and maximum height of a projectile motion with air friction however Mathematica is "running" for a really long time and not giving an answer. Is there something wrong with ...
2
votes
0answers
48 views

Simplify large fractions

Hi i'm quite new with Mathematica and i'm experiencing some problems with Simplify and FullSimplify. I'm dealing with a sistem ...
0
votes
2answers
44 views

How do I simplify an algebraic equation with respect to a specific variable? [closed]

I have the following equation -- which is all in terms of d: ...
3
votes
1answer
48 views

NDSolve with known tolerance function

I would like to solve the differential equation: y'[x]=F[y[x],x] with y[0.5]=y0 and x ...
7
votes
2answers
202 views

Palette button with progress bar

Let's say you have a palette with a button that has to do some time-consuming task when clicked: ...
-2
votes
0answers
46 views

the equation has smll 1,2, why? [closed]

the result is wrong, cause it has small 1,2, on the right hand of the corner. I don't know how to solve it about the calucate
0
votes
0answers
43 views

ContourPlot color problems

I tried to use contourplot to a 2D fucntion with rescaled color, the code is given below ...
5
votes
2answers
172 views

Random walk with fixed initial and final coordinates and the length

Looking at the problem of a random walk in 2D or 3D, I would like to generate several trajectories that start all in some starting point, say, (0,0) in 2D and (0,0,0) in 3D and end up all in a ...
0
votes
1answer
38 views

NSolve taking too long to solve system of polynomial equations

I am trying to solve a system of polynomial equations (10 variables and 10 equations) using NSolve in an attempt to find all solutions. ...
0
votes
0answers
69 views

How could I add the WorldMap skin to this parametricPlot3d?

How could I stamp the worldmap inthis sphere of variable radius? I´m interested in the meridian of greenwich (longitude=length=0 Degree) is in the position of the longitude=length=0ºDegree of the ...
0
votes
2answers
79 views

Multidimensional Numeric Integration

I can't manage to calculate numerically the following multidimensional integral: ...
0
votes
1answer
29 views

Selecting from a list [duplicate]

OK, I know this must be a simple problem, but right now I'm just stuck and need some advice with this :). I have the following list: ...
2
votes
2answers
158 views

Strange result of an infinite sum

I have the following definition: o[a_] := Sum[ x^(2 k + 1) Product[(2 i + 1)^2 - a^2, {i, 0, k - 1}]/((2 k + 1)!), {k, 0, Infinity}] Now when I evaluate ...
0
votes
1answer
40 views

NdSolve problem :NDSolve::ndode: Input is not an ordinary differential equation

I am new to Mathematica. I am working on solving the following different equations numerically written in the code as below. Not so sure about the boundary values that depends on R (M(0)=0, n(1)=0) ...
0
votes
0answers
35 views

Filling the area made of 4 lines [closed]

I have a question to ask. How one can fill the area of joined 4 lines as showed on the figure attached? where I used Graphics to produce. Any suggestions will be highly appreciated, and thanks in ...
0
votes
2answers
118 views

Spiral roots, how?

I found this picture on the net, as I can play in mathematica
1
vote
1answer
47 views

How to reset the “front end” to a 200% default

I wish that when Mathematica is run the "front end" this default to 200%, and perhaps other things where you can not change, as there are directly in the menu. Thank You
2
votes
1answer
102 views

(NDSolve) Non-linear 2nd order ODE, regular singular point (looking for good methods for this problem)

I am solving this set of non-linear 2nd order ODE by NDSolve, $$r^2\frac{d^2f}{dr^2} = 2f(1-f)(1-2f)+\frac{r^2}{4}h^2(f-1)$$ $$\frac{d}{dr}\left[r^2\frac{dh}{dr} \right]=2h(1-f)^2+\lambda ...
2
votes
0answers
40 views

Enforcing WorkingPrecision in NIntegrate

I have a very complicated 2D integral that I need to calculate repeatedly, and I'm trying to speed it up a bit, since at the moment it's taking a couple of days to complete. One thing I've noticed is ...
-1
votes
1answer
71 views

Visualize Space Pascal's triangle

Visualize Space Pascal's triangle I found this image on the web, I want to know how to draw with software. I try to search, found this. I have learned a mapping in the plane
-1
votes
1answer
36 views

Different output, simple question [closed]

I found a slightly different output than what was expected in a book. DefSumMod[10] G={0,1,2,3,4,5,6,7,8,9} CircleGraph[G,Add[1]] Why is the tracing directed ...
2
votes
1answer
74 views

Nullclines and equilibrium point labels

I am trying to draw the vector field, nullclines, and equilibrium points for the system $$ \begin{align*} x'&=2x-y+3(x^2-y^2)+2xy\\ y'&=x-3y-3(x^2-y^2)+3xy \end{align*} $$ I have completed ...
2
votes
3answers
89 views

Converting between AbsoluteTime and Unix time

By trial and error, I've found that the following gives the current Unix time: AbsoluteTime[] - UPOCH where UPOCH can be defined in any of the following ways: ...
9
votes
1answer
161 views

Extracting road curves from an image

I have taken several gps readings while driving around town. ...
0
votes
2answers
38 views

How do I complete this function len for the length of a line segment?

I need to have len[{{x1,y1},{x2,y2}}] is Sqrt[(x2-x1)^2+(y2-y1)^2]. The beginning of the function will be defined as ...
0
votes
1answer
35 views

return multiple properties of financialdata

Sorry, very silly newbie question.. regarding FinancialData, how to return multiple specified properties. eg. if I want Open & Close properties , or perform an operation such as Open-Close ...
1
vote
1answer
27 views

Implicit region is not “valid” in ParamatricNDSolveValue function?

I am trying to solve a geometric problem with relation to my Schrodinger equation and its boundaries. Here is my code: ...
0
votes
0answers
15 views

Collecting and simplifying polynomials [duplicate]

I want simplify some expressions but also using an ordered form for a polynomial. Collect[..., Q, Simplify] should do the job, but sometimes the results does not ...
-1
votes
0answers
22 views

Feasability question about object tracking in 3d space

Is it possible to use 3 different webcams to track an object in an xyz axis. If so, how would one do it?
1
vote
0answers
29 views

Better control of vertex positions in GraphPlot?

I am trying to graphically visualize a sort of a transformation network. My program generates a list of vertices and edges and I want to turn that into a visually clear graph fulfilling a few ...
-3
votes
2answers
86 views

Solving the symbolic quadratic equation ax2 + bx + c = 0 [closed]

I need to ask Mathematica to solve the symbolic quadratic equation ax2 + bx + c = 0. Does it give you the right answer?
2
votes
0answers
34 views

Surface Plot 3D of a strongly concave shape

I have a list of {x,y,z} points that all lie on the surface of an object (model output from COMSOL). I would like to generate a graphics object that reproduces the surface. Ideally, I would like ...
2
votes
1answer
144 views

Is there a bug in MatrixExp in Mathematica v10?

I'm trying to compute MatrixExp[-I t {{0, 1/2, 0, 0, 1/2}, {1/2, 0, 1/2, 0, 0}, {0, 1/2, 0, 1/2, 0}, {0, 0, 1/2, 0, 1/2}, {1/2, 0, 0, 1/2, 0}}] With ver 9 the ...
2
votes
2answers
79 views

Dynamic arrays and lists with compile (Append, Linked lists etc.)

I have a code that I need to compile. The code contains a loop in which I need to gather data into a list. The question is how to best gather data so that the code works inside Compile. The following ...
0
votes
0answers
39 views

Plot appears squeezed [closed]

I am using ParametricPlot and this is what I got: I would like to enlarge the y-axis. I know PlotRange can do this. But I am ...
0
votes
0answers
53 views

Is it possible to find $n$ from the sum forming a polynomial? [migrated]

How does one solve for $n$ in: $100000 = \sum\limits_{x=1}^n 1020.2065\ x^{-0.3431}$
0
votes
0answers
46 views

Having trouble reading this output (pure functions) [duplicate]

I'm after decoupling some odes and trying to solve them using mathematica but my output is in terms of Functions and InverseFuntions and I'm afraid I have no idea how to translate the output into ...
2
votes
1answer
109 views

How to add a static JPEG into a Manipulate without slowing it down

I´m trying to add an image from a book into a Manipulate but it makes the Manipulate update very, very slowly. So much so that ...
2
votes
2answers
48 views

Problem with the BarChart3D function

I have a list of values {x,y,z} and I would like to create a 3D bar chart with axis x,y,z . ...
1
vote
1answer
61 views

The relative motion of the points about the common center of mass

There are 2 points with masses m1 and m2, their common center of mass   rC,r1 and r2 their radius vectors, r=Abs[r1-r2]. I built a trajectory of both material points, as well as their common center of ...
-1
votes
1answer
25 views

How do I get axes labels in a DensityPlot? [duplicate]

I am trying ...
1
vote
1answer
52 views

FunctionDomain doesn't work with If

When I call FunctionDomain for function defined by a formula with If, for example ...
-1
votes
0answers
25 views
3
votes
1answer
114 views

How to accelerate my code?

Given a 2D $M \times N$ matrix with non-negative values, I would like to find a path going from top to bottom such that the sum of the path is minimum. My function is defined as follow: ...
2
votes
1answer
170 views

Weierstrass function

I am trying to create plot of the Weierstrass function in Mathematica. I wonder if it's possible, when I define this function as ...

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