5
votes
1answer
213 views

Finding and plotting roots with parameter

I have the following function: $$u(x,t)=\sum_{k=1}^\infty\frac{v_0 L}{\lambda_k c \sin\left(\lambda_k\right)}\sin\left(\frac{\lambda_kx}{L}\right)\sin\left(\frac{\lambda_kct}{L}\right)$$ and this ...
2
votes
2answers
338 views

How to set viewpoint Graphics3D to a different default orientation?

I'd like to have a SphericalPlot3D show up with the "z-axis" oriented horizontally by default. For example, in ...
-1
votes
1answer
108 views

amplitude-phase modulation equations solution

I am trying to solve the following equation ...
2
votes
1answer
55 views

PrecedenceForm with Format

I'd like to format the output of certain operators with Infix-style formatting to have lower precedence than Times. Let's say I ...
0
votes
1answer
96 views

Draw filled regions in DateListPlot

How do I draw specifiq filled regions in DateListPlot? I trying to plot something like this: Thanks
0
votes
0answers
37 views

All output in TexForm [duplicate]

In the Preferences -> Evaluation panel, there are only options for StandardForm, TraditionalForm and ...
2
votes
1answer
108 views

Font presentation difference between version 9 and version 10

I am trying to make presentation quality bar charts. As part of my effort, I used the code below. Updated to eliminate font specification. The problem appears to be a rendering difference, not a font ...
3
votes
2answers
464 views

Finding if a point is in a region bounded by a curve and the axes (curve made of discrete points)

Here's a small example this is not the real curve but a simple example I made for this question. Here's the plot of a list with a point A of known coordinates. Now I need to find if the point A ...
1
vote
1answer
144 views

Animate function

...
1
vote
0answers
105 views

Find algorithm or generator formula with automated procedure and pattern recognition

I am trying to find a generator formula for the discriminant of a polynomial and believe it would be an interesting problem for the Mathematica community to know how to automate evaluation of certain ...
2
votes
1answer
210 views

Line integrals over a path defined by a set of points (rather than an analytic formula)

I'm getting inaccurate results when computing (plotting) the value of a function against the length of a line integral, where the path comes from a set of numerically calculated points. (In contrast, ...
0
votes
1answer
273 views

CDF Player 10.0.2 does not launch

I have recently downloaded the new CDF Player 10.0.2. I export a CDF, and create an HTML page, to host the CDF, using the code provided by Mathematica 10.0.2. When I open the HTML page in Chrome ...
0
votes
2answers
62 views

Proper arguments to ListPlot? [closed]

...
0
votes
1answer
81 views

NDSolve printing error message NDSolve::ndode [closed]

Using NDSolve while solving system of ODE's. Here is my try ...
0
votes
1answer
83 views

How to use pattern matching for integral identities?

I have an unknown pdf f[x], and I need to express integrals involving f[x] as expansions of the moments of f[x]. For example: ...
0
votes
2answers
57 views

Solving linear recursions without constant depth in mathematica

Mathematica does not like this recurrence relation. I do not understand why? ...
5
votes
4answers
235 views

How can I get a list of the positions of the running minima in a list?

I want the positions of the (sequential) running minima in a list, that is, the positions of entries that have the minimum value of all the elements in that list, up to and including that entry. For ...
2
votes
2answers
392 views

Diagonal minors of matrix

I need to calculate the minor of a matrix. I am going to use Mathematica example here, ...
3
votes
3answers
360 views

List manipulation: Dropping first or last row or column of a matrix

How do I drop the first/last row or first/last column from a matrix? The general case is answered here but I am new to Mathematica and it the arbitrary case is unnecessarily complex. Suppose I am ...
2
votes
2answers
451 views

How to change the form $A\cos \omega t + B\sin \omega t$ into the form $\sqrt{A^2+B^2}\cos(\omega t-\phi)$ [duplicate]

I'm preparing notes for teaching next week's class in differential equations. My hand calculation solution of $$y''+192y=0, y(0)=1/6, y'(0)=-1$$ is $$y=\frac16\cos 8\sqrt3 t-\frac{\sqrt3}{24}\sin 8\...
4
votes
4answers
338 views

Iterating over a list, in a functional way

I have learned a lot about functional programming just from messing around in Mathematica, but I've come across a problem that I don't know how to solve in a "functional" way. Any help would be ...
0
votes
1answer
291 views

Use ParametricNDSolve with Plotting

I am attempting to solve a differential equation of the form $$ \frac{dx}{dt}=ax+by \\ \frac{dy}{dt}=cx $$ with parameters $0<a<1$ and $a,b,c \in \mathbb{R}$. I am able to use NDParametric ...
1
vote
0answers
469 views

NDSOlve - 1D wave equation with boundary

I am currently trying to solve the 1D wave equation with Mathematica: $$c^2\frac{\partial u}{\partial x^2}=\frac{\partial u}{\partial t^2}$$ I want to do so for a cantilever with a tip mass: One ...
0
votes
3answers
135 views

How to define a function

How can I define a function which depends on a function of x? Something like this f[u[x]_,u[x]']= u[x]' + a [x] u[x] +b[x] I think I wasn't enaugh clear. If I ...
0
votes
1answer
73 views

Elements inside arrays seem to be strings rather than signed numbers

When I have code like b = Array[Subscript[be, #] &, {3, 1}] b = b /. {Subscript[be, k_] :> Subscript[-be, k] /; k > 1} I am noticing that Mathematica ...
4
votes
3answers
229 views

Replace elements in matrix to make it symmetric using automated procedure

I am generating a matrix using (mat2 = Array[Subscript[a, ##] &, {4, 4}]) // MatrixForm but would like to force Mathematica to make it symmetric. Thereby I ...
7
votes
1answer
103 views

Strange behavior when setting NumericQ of a symbol

It happens both in v9&v10. If you try this a^0 a^0 (1/a)^(3/2) a^0 (1/a)^(5/2) Mathematica returns 1 (1/a)^(3/2) (1/a)^(5/2) It's trivial. However,...
2
votes
1answer
303 views

Issues with Arrow and Graphics3D [closed]

I'm trying to plot a simple picture: a plane with a circle in it, and three vectors in the curve. Mathematica keeps saying that the array "has the wrong dimensions for a graphics coordinate list" and ...
9
votes
2answers
210 views

Inconsistent behavior of undocumented Encode->Import->StringToStream->Get on password-locked stream

Let's save a definition. Encode it with password/key and Get it again. We will not use Get ...
11
votes
1answer
151 views

Adding Trace produces error messages

This is very strange. As I was trying to debug this problem, I noticed when I add Trace then I get lots of internal errors generated. This also happens the first ...
4
votes
1answer
97 views

Problem with Simplify, Sqrt, and Set: What's going on?

I am having some trouble getting Mathematica to simplify an expression of the form Sqrt[x]*Sqrt[1/x], where x>0. The problem is that x is assigned to some complicated form by the time Mathematica ...
0
votes
1answer
167 views

Plotting Complex Numbers - Functions of Complex Numbers [duplicate]

So I have to generate a few different plots with z, where z is a complete number... z[x_, y_] := x + y*I F[z_] := (25*Pi*z*I)/(1 + 10*Pi*z*I) First, I need to ...
1
vote
1answer
126 views

How to find and verify relationships between functions?

MMa gave me a complicated result involving Hypergeometric0F1's. It was much less complicated after I discovered this identity: ...
0
votes
1answer
80 views

Size of the box using Manipulate function

I am using the following command: Manipulate[Graphics[Arrow[{{0, 0}, {a Cos[ω t], a Sin[ω t]}}]], {t, 0, 10, 0.1}] In order to display a vector in circular ...
1
vote
1answer
72 views

Problem with converting \frac into mathematica output [duplicate]

Please help me with the following problem: TeXForm[2/3] The Answer is correct: "\frac{2}{3}" I don't understand why ...
1
vote
0answers
142 views

How to find soccer balls in an image? [closed]

I have 10k images and I need automatically remove only soccer balls, excluding other types (volleyballs, baseballs, etc...). I'd like to use computer vision methods of V10 to find their masks and ...
1
vote
1answer
127 views

Notebook downloaded from web giving error message

Just bought a copy of E. J. Mcinnerney's textbook Computational Explorations in Magnetron Sputtering. However, when I download and try Chap2.nb from: http://www.computationalexplorations.com/...
-1
votes
1answer
77 views

Graphing a vector [duplicate]

I have a vector (in physic) designated asF1=250cos(60)i+250cos(60)j+250cos(45)k, and i would like to see it in a 3D graphic with the axis centered at the origin, after what i would include other ...
3
votes
1answer
109 views

Combining MapAt and MapIndexed

The very last example in the documentation for MapAt is: MapAt applies f repeatedly if a part is mentioned repeatedly: ...
0
votes
1answer
264 views

How to plot and visualize a single linear vector in 3D? [closed]

I have a vector (in physic) designated as F1=250cos(60)i+250cos(60)j+250cos(45)k, and i would like to see it in a 3D graphic with the axis centered at the origin, after what i would include other ...
2
votes
1answer
147 views

Function equal to Ctrl+Shift+I [duplicate]

No, it's not InputForm. Consider this example: ...
0
votes
1answer
83 views

Usb-harddisk and raspberry

Mathematica on raspberry. External media access. I have a usb harddisk, which is recognized by the system, but apparently not known to Mathematica. The disk is not seen when I try to open files from ...
1
vote
0answers
56 views

Mysterious message posted when I move the cursor in a custom function

I wrote a function called CPlot for complex plotting which is supposed to act a lot like Plot in its input format, but ever ...
2
votes
3answers
572 views

Function to calculate average of multiple lists

I have several lists of experimental data f[x] with different intervals Δx including some noise. ...
7
votes
1answer
157 views

Why can't I abort main evaluation from ScheduledTasks (Service Link)?

FrontEndExecute[FrontEndToken["EvaluatorAbort"]] is equivalent of the menu item: Evaluation >> Abort. It works with ...
2
votes
2answers
151 views

Dynamic visualization of two histograms

I have two histograms histo1 and histo2: ...
2
votes
1answer
147 views

Force Mathematica to return numerical answer to (relatively) complicated differential function

I am trying to take the Laplacian of the LogDet of a 2x2 matrix that I call V\[ConjugateTranspose].V, and actually get a number out at the end. Why does Mathematica ...
0
votes
0answers
375 views

Low CPU usage. How to increase it? Should I? [duplicate]

I'm running a programme, and below are some graphics from the resources monitor from windows 8, while running my programme in version 9 of mathematica. Sorry for the foreign writings in the pics, but ...
0
votes
1answer
82 views

Equivalent parametric plots don't look the same

ParametricPlot[ {1, Tan[t]}, {t, -Pi/3, Pi/3}] ParametricPlot[ Sec[t] {Cos[t], Sin[t]}, {t, -Pi/3, Pi/3}] The second parametrization does not plot like the first, ...
1
vote
0answers
81 views

How to extract data points from an image of a log log plot? [duplicate]

I have a picture of a log-log plot, taken from a paper and I want to extract the data points so I will be able to plot them again along with results of my own solution. I would appreciate your help. ...

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