-1
votes
0answers
14 views

Importing only some values from a file

I use Mathematica and I have many values (x, y, z, ed, dx, E, ...) in a file. I want to import the values of x, y, z, and no others into another file, and then draw these values x, y, z. How can I do ...
0
votes
1answer
18 views

Integrate complains about incompatible quantities in integration limits

When I run the following code, Integrate throws ...
3
votes
1answer
33 views

Removing faces from BarChart3D plot

I'm trying to make a 3D bar chart plot with transparent faces on the sides, but for some reason it's very hard to remove them (or to make them transparent at least). I tried looking through the ...
0
votes
0answers
14 views

Mesh-Warping image from 3DS

Id there a way to warp an image using a mesh (plane with 14x8 cells) I have created and imported from 3d-studio? The reason for this is to warp a UV texture so I can look up quickly for distorted ...
1
vote
0answers
10 views

Call Remote Kernel from NETLink

Is it possible to run a remote kernel from NETLink in some way as suggested by the second method below: DoRemoteMathCommand? ...
1
vote
1answer
23 views

Deleting duplicates of plus or minus symbolic quantities from a list

Let's say I have a list l = {a + bc - d, -a - bc + d, a + b};. Now I want to apply DeleteDuplicates[l, crit] to this list, such ...
2
votes
2answers
41 views

Interpreting Results of Repeated Measures - Shift calculation in plots

What would be a more accurate method to calculate the shift in waveform (waveform drift) from a collection of 20 or more data plots. Current method, Plot all using Show and see if there is some ...
4
votes
1answer
20 views

How to simultaneously extract contourvalues and contourline?

Given a contour plot, plt=ContourPlot[Sin[x y],{x,-1,1},{y,-1,1}] I can extract the values of the contour lines using, ...
1
vote
1answer
30 views

Adding a fading color to multiple lines in 3D

I would like to add a fading color to all the 3D lines I'm drawing with the code below, but I'm having difficulties with implementing the idea. The curves are starting on a unit sphere, and extend in ...
0
votes
0answers
18 views

Piping StandardForm from within GUI

I am working on a GUI project where I need to pipe a string I constructed in Mathematica into an external program. For example ...
1
vote
1answer
43 views
2
votes
1answer
33 views

Simple minimization not evaluating

I tried to solve a rather simple optimization problem, which Mathematica apparently cannot handle. A minimal example is the following: ...
3
votes
0answers
29 views

How to use Wikimapia as GeoServer?

I wish to use the Wikimapia map as background in GeoGraphics. According to the Wikimapia Docs, Wikimapia's URL is encoded as follows: An example Wikimapia URL ...
4
votes
2answers
91 views

Turning an expression into a function inside another function

Say I have an expression g=Sin[q]; It is easy to turn it into a function, and to perform manipulations on this function (this and variants of this were discussed ...
0
votes
0answers
6 views

An equation involving fractional expressions [migrated]

(3/x + 5/x+2) = 2 How come when I solve this equation by setting the RHS of the equation to zero I receive x = 1, -3 AND when I ...
2
votes
1answer
117 views

An error disappears?

I needed to define a table of functions. And I did it like this: ...
1
vote
0answers
19 views

Function assigning loop misses a beat [duplicate]

Ive come across this in managing a table, but is seems to be reproducible in simpler forms. I simply want to iterate a defined function for various values and then work with those at a later time. ...
3
votes
0answers
47 views

Problems with StateSpaceModel in v10.2

I don't know if this is a bug, or if just something changed I can't figure out. Take the following examples: ...
5
votes
1answer
83 views

How to use ForAll to prove things about functions?

Suppose I first declare: $Assumptions = ForAll[{a,b}, b > a, f[b] > f[a]] I (wrongly, as it turns out) assume that that this would cause ...
0
votes
0answers
44 views

Find faces in an any image [on hold]

Find the exact face in any image? Boundary of the found face should include both eyes, lower chin, and both ears.
0
votes
0answers
32 views

Graphics3D evaluation order problem

I have the following block of code: ...
9
votes
2answers
82 views

Using Rules inside SequenceCases degrades Performance

Consider the following: SequenceCases[Range[10^4], {a_?PrimeQ, b_, c_?PrimeQ}]; // AbsoluteTiming {0.0058148, Null} If we now try to use a rule to transform ...
-2
votes
4answers
61 views

Converting an expression to function

I have the following problem. I current can automatically create the variable positionPayload, for instance: ...
0
votes
1answer
54 views

How can I produce an animation in a WPC notebook?

I want to display an animated Sin curve in a Wolfram Programming Cloud notebook. I tried the docs' example for Animate ...
0
votes
0answers
24 views

Using Cases with a list argument [on hold]

I want to write a function that uses Cases with a variable number of arguments (digrams, trigrams, etc.). ...
3
votes
2answers
90 views

Even with Evaluate[], Mathematica is plotting everything in the same color

The code evals[x_?NumericQ] := Eigenvalues[{{x^2, 2 x}, {x, 3 x^2}}]; Plot[Evaluate[evals[x]], {x, -1, 1}] gives both eigenvalues in the same color. I thought ...
0
votes
0answers
41 views

Maximizing a 3-variable function

I want to find the maximum of the following function $$f(x,y,z) := -y^2 - 3 z^2 + xy + 2xz - 2yz + my + (m + n + t)z - nx,$$ where $m,n,t$ are indeterminate constants, subject to the constraints ...
1
vote
3answers
84 views

How can I clear the content of my notebook in Mathematica?

The Clear command is for clearing definitions of symbols. Is there any built-in function to clear the work area of my Notebook?
4
votes
2answers
52 views

Possible memory leak when importing JSON

Bug introduced in 10.0 and persisting though 10.2.0 This problem that I would like to resolve is how to free memory used Import a file when the file is no longer in use. I have a project in which ...
-6
votes
0answers
56 views

How can I fix this hole?

What I did and what I got: ...
4
votes
0answers
56 views

How can I avoid these defects in ContourPlot3D output?

What I do: ContourPlot3D[-x^2/17.07 + y^2 + z^2 == 1 - x^17.07, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}, Mesh -> None, PlotPoints -> 16] What I get: ...
-1
votes
1answer
50 views

Rotate with Euler angles in Graphics3D [on hold]

I need to rotate with the Euler angle sequence: Yaw by $\psi$ around $z$ Pitch by $\theta$ around $y'$ Roll by $\phi$ around $x''$ I know of Rotate[] in ...
4
votes
2answers
95 views

How to clear everything in Mathematica? [duplicate]

I am a new user. According to a documentation, Clear["context`*"] clears all symbols in a particular context. I want to clear everything (functions, variables, etc..) After I use the above command, ...
2
votes
1answer
143 views

Saving file as .m causes it to save as comments

I am attempting to create a Package and so am saving a notebook with the code from Mathematica's example ...
0
votes
1answer
77 views

Dynamic programming: Fibonacci generator

I have the following piece of code: ...
0
votes
0answers
43 views

How to inscribe a circular helix in a cylinder? [on hold]

I need a way to plot a circular helix in a cylinder on Wolfram Mathematica. Someone can help me?
0
votes
0answers
22 views

Issue with Differentiation over a tensor

I am new user in Mathematica. I am working with liquid crystal theory, and one of the notation there is the tensor: $ \Pi_{ij} = \frac {\partial {F_{el}}} { \partial ( \partial {n_i} / \partial { ...
1
vote
0answers
18 views

OrientDB JDBC OpenSQLConnection : Execution of SQL failed

I am testing JDBC connection of OrientDB v2.0.13 from Wolfram Language. ...
4
votes
1answer
54 views

Is there a way for accuracy backtick notation to accept variable inputs?

Backtick notation uses 1.0``20 to give 1 with 20 places of accuracy after the decimal point. But what I want is ...
7
votes
2answers
96 views

Cannot Block Plus

It is customary to use the following idiom to partially evaluate something inside a held expression: ...
-2
votes
0answers
20 views

How does $1\rightarrow A\rightarrow B\rightarrow C\rightarrow 1$ imply that $Im(f:B\rightarrow C)\cong B/A$? [on hold]

From a lot of SE answers and also web forums, in a short exact sequence, people say the injective property from A to B and surjective property from B to C clearly implies the image of the function is ...
3
votes
3answers
173 views
0
votes
0answers
37 views

Transform a vector DE into a set of scalar DEs [on hold]

I have the vector equality: {{a,b},{c,d}}.D[{x1[t],x2[t]},t]=={{e,f},{g,h}}.{u1[t],u2[t]} I want to solve this using DSolve. ...
5
votes
1answer
136 views

Dipolar magnetic field lines inside a cylinder

I'm drawing the magnetic field lines of a rotating dipole (magnetic field distorded by emission of radiation). Currently, my Mathematica 7.0 code is fully working, but I'm having a constraint which I ...
2
votes
0answers
41 views

Suggestions for solving a large linear system

I have a system of $\approx 200,000$ linear equations in $\approx 40,000$ variables (with rational coefficients) and I would like to determine the dimension of the solution space, which I know to be ...
4
votes
1answer
55 views

In a PDE solution let us integrate out one of two coordinates

Here is a trapezoid within which I am solving a simple Laplace equation with the Dirichlet boundary conditions set at its top and bottom: ...
-5
votes
1answer
38 views

create a table via menu-

I created a table via menu 3x3 , but I cannot add afterwards a new line or column, the tool doesn't add a row of 3 columns but a row of one column at the end ... adding a new column, adds at the end ...
3
votes
1answer
42 views

Saving Dot-ed eigenvectors in a special comparison

We have produced a 4*4 matrix in any iteration containing nx from 0 to 2 by steps of 0.5. and in any iteration we have saved sorted orthogonalized-eigenvectors based on their eigenvalues with this ...
-1
votes
0answers
44 views

ParametricPlot3D produces no output [on hold]

When I try to run the code I show below, it doesn't plot anything. I guess ParametricPlot3D doesn't understand the functions that I defined. How can I deal with ...

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