All Questions
0
votes
0answers
3 views
How to set image DPI?
For publications usually images in TIFF format are required in high resolutions. Where can I change settings for images that are being saved (using RMB click "Save Graphic As..."), so I don't need to ...
0
votes
0answers
33 views
What is wrong with this Cobweb plot
Something is wrong with my cobweb plot code but I couldn't figure out where do the mistakes come from.
So basically we have the iterative map $x_n == x_{n-1}^{2} - 3 \mu$. I would like to draw a ...
-5
votes
0answers
41 views
If I have 4 kernels, why cannot I perform computations in parallel? [closed]
As Mathematica is quite slow, I want to run some computations, and until they are done I would like to work on something else. It is said that my version of Mathematica has 4 kernels. So why when ...
0
votes
0answers
34 views
How can I connect to a SQLServer database without login details?
I create a New Database in MS SQLServer 2012, specifically I didn't mention any Login details. I created tables in that DB.
Now I want to connect with Mathematica. For that purpose I wrote the ...
0
votes
0answers
75 views
How to asynchronously download 100000 urls in an efficient way
URLSaveAsynchronous can download one url page, how to download 100000 urls in an efficient way?
And better to with an whole progress bar.
I've downloaded 90000 ...
0
votes
0answers
38 views
Where can I find description of errors and warnings?
I am trying to solve numerically quite simple equation using NSolve[]. NSolve writes a warning:
...
-3
votes
0answers
36 views
Why mathematica returns list of rules instead of values in NSolve. Why outputs from different functions are inconsistient (NSolve/FindRoot) [duplicate]
Functions like NSolve return list of rules instead solution values. I have two questions:
1) how to change such list to list of values, for example
...
0
votes
0answers
9 views
How to assign values to a function at discrete points? [duplicate]
Suppose we are interested in a function f[x] that is defined only at discrete points:
x = {1.1, 2.1, 3.1, 4.1, 5.1}
We want to ...
3
votes
0answers
49 views
Different behaviours of Default Argument
I don't really understand the behaviour of Default Argument. If I execute this command in Mathematica:
In: {f[a], f[a + b]} /. f[x_ + y_.] -> p[x, y]
...
1
vote
0answers
36 views
CUDAQ[] returns False in version 9 while true in version 8
CUDA works in version 8 but not in version 9. Is there a way to fix the problem in version 9? I've installed the latest CUDA from the official website https://developer.nvidia.com/cuda-downloads
1
vote
0answers
35 views
12
votes
2answers
116 views
Sharp background image in plot
How do I get rid of blurry transitions between pixels of the background image below. It's the fault of Texture[], previously discussed in this answer.
I haven't ...
1
vote
0answers
44 views
Problem with extracting specific contour from a ContourPlot
I am trying to exctract contours of specific value (2.6*10^-6) out of a ContourPlot and measure their area.
Below you can see the code. It is noticable that not all of the relevant contours showed in ...
5
votes
0answers
26 views
At what point should MLSetMessageHandler() be called?
I have an Installable MathLink program written in C. I would like to use a custom message handler. At which point in the C source code should I call ...
3
votes
2answers
87 views
Why don't these styling rules work when viewed in TableForm?
m = RandomInteger[{-5, 5}, {10, 10}];
m /. {x__, y_ /; y > 0} -> Style[{x, y}, Red]
% // TableForm
When m without style ...
2
votes
1answer
63 views
Recursion depth exceeded
Below is my code for numerical solving of PDE with Crank Nicolson scheme.
...
1
vote
1answer
52 views
How to get a solution set of a nonlinear system of equations?
I'm trying to find the solution set of {x, y} variables for the following system of equations:
...
3
votes
1answer
70 views
Cannot solve system of linear equation sums?
I cannot get mathematica to solve:
The problematic code:
...
3
votes
1answer
61 views
Resampling when using image as Texture
How to get sharp pixel boundaries with Texture? I'd like to have only black/white in the example below, no gray.
...
0
votes
0answers
28 views
Import/Export Cluster Object [duplicate]
I want to export and then import back in a cluster object from Agglomerate. After the import, the imported object does not behave as a cluster - for example, ClusterSplit does not recognize it as a ...
3
votes
1answer
98 views
Using single replacement rule to convert algebraic expression
I have been trying this problems for hours and cannot find any helpful clues.
How can I convert $Sinh[3\theta]+Sinh[\theta]$ to a rational function of x given $2Sinh[\theta] = x-x^{-1}$ by using only ...
3
votes
2answers
72 views
5
votes
2answers
85 views
6
votes
0answers
43 views
How to create internally optimized expression for computing with high WorkingPrecision?
I have large dataset and need to fit rather complicated function on it with different values of one of its parameters (this parameter must be fixed in every fit). I use the ...
2
votes
1answer
70 views
Generating a list of all factorizations
What is the best way to generate a list of all factorizations of some number $n$? I'm quite new to Mathematica so this might be obvious. I have been trying some basic stuff with ...
2
votes
3answers
86 views
Why do these two different zetas produce the same value?
Zeta[-13] == Zeta[-1] == -1/12
Why do these two different zetas produce the same value?
0
votes
1answer
113 views
Solve this equation symbolically
I am trying to solve the equation for the quantity r = y/x symbolically:
3/y^4 == 3/x^4 + a/(x + 2 y)^4
with the requirement that we need to perform the ...
0
votes
0answers
33 views
How could I find the correct values for every array that would lead me to unique summation number for every unique chain? [migrated]
I have 9 arrays, each array has 9 values, I need to get the proper values in every value's position for every array, and that would give my a completely unique summations for every value's chain from ...
2
votes
1answer
71 views
Range of stability for iterative map
Using linear stability analysis, I would like to compute the range of stability of the fixed points and the 2-cycles of the following iterative map: $x_n = x_{n-1}^{2} - 3\mu$.
Setting $x = x^{2} - ...
4
votes
2answers
81 views
Smooth Kernel Distribution
I am researching the Silverman rule of thumb for bandwidth selection.
Below is a sample of my code, from which it seems that BW=63 is close to the default parameter given by Mathematica (2 images are ...
1
vote
0answers
28 views
Indexing of Large System of Equations for Use in NDSolve
I currently have a list of ~150 DAE's (differential-algebraic equations) and I need to be able to work with using NDSolve. Fortunately I already have them ...
1
vote
2answers
75 views
How to create a 3D curved surface, given some discrete points in space?
I have some 3D point data and I want to create a curved surface with these points, and export the curved surface data (point coordinates) according to points density on the curved surface. How can I ...
1
vote
0answers
63 views
Nontrivial solutions of equation
Here, I have one problem in finding nontrivial solutions of a system of equations. I want to choose one variable, for example X1 and to get solutions of X2(X1) and X3(X1). It is not difficult when I ...
2
votes
0answers
40 views
Eureqa Client to connect to Mathematica under Windows
Does there exist a way to use Eureqa software with Mathematica under Windows?
That is, is there a working client to connect to a Eureqa server?
3
votes
0answers
23 views
Correct behavior of lock file in hsqldb connection
I'm running in to some problems with generating a persistent HSQLDB and during some troubleshooting I came upon the following behavior.
...
0
votes
2answers
127 views
Doing vector manipulations on Mathematica
This is hopefully a simpler version of this previous unanswered question of mine.
Let me just focus on the two expressions $F_2^{(s)}$ and $F_3^{(s)}$ given in A.3 and A.4 of page 19 of this paper. ...
2
votes
0answers
78 views
Why my Mathematica 9.0.1 wont work with some samples of Mathematica in Graph Theory?
I updated my Mathematica recently to 9.0.1 cause the previous version was giving me freaky result especially in FindMinimumCostFlow and ...
2
votes
2answers
80 views
2
votes
2answers
61 views
Importing LTSpice data into mathematica
I am working with LTSpice (Discret electrical circuit ( Spice) simulator). I would like to import LTSpice ouput data into mathematica for processing and plots.
An example of a file can be found here ...
0
votes
0answers
35 views
Returning a non-degenerate list of triangles that (strictly) define the outer mesh of a 3-polytope using PolyhedronData?
I'm looking for a simple method of returning a list of triangles that strictly define the outer surface of a 3-polytope using PolyhedronData?
For example:
...
5
votes
3answers
96 views
Applying a function with the HoldAll attribute inside NestList
I'm trying to write an update function, which can be applied to a list and then to NestList it.
As the function has to manipulate the given variable I figured I ...
0
votes
0answers
40 views
Anti-aliasing won't work when there is PlotStyle command
I've found that if there is PlotStyle command in the input, anti-aliasing will not work.
However if the Style code is ...
1
vote
1answer
68 views
3rd derivative keyboard shortcut
For a long time i've evaluated D[f[t],{t,3}] to get this power-like derivative thing:
$$f^{(3)}(x)$$
Is it possible to obtain same through an easier keyboard ...
2
votes
4answers
129 views
How can I create a list of functions?
Can anyone tell me, how to create a list of functions? I've tried the following code, but it doesn't work.
...
-5
votes
0answers
77 views
Extracting points data from a 3D curve surface?
I have a 3D data sets, and I have used it to create a 3D plot, but some of the data points are errors and need to be removed. How I can I remove the bad points from the plot?
...
2
votes
1answer
59 views
Flat function with repeated sequence
There are functions like Join[ ] that accept a variable number of arguments. Join is a flat function, as the order of arguments ...
5
votes
4answers
168 views
How do I obtain the correct double limit?
The command
Limit[(Sin[x^2] + Sin[y^2])/ (x - y) /. x -> 0, y -> 0]
(*
0
*)
I think that Mathematica finds the iterated limit instead of the double ...
1
vote
0answers
53 views
How to SystemOpen Mathematica only one time?
Here is my prevous question
When I'm trying solve that question:Reset-$Language— each time open a Mathematica.
Because If I open one English-Version-Mathematica, ...
0
votes
1answer
59 views
What does Binomial return for non-integer arguments?
Mathematica returns values for non-integer arguments passed to Binomial.
What is the definition of Binomial for such continuous ...
1
vote
1answer
58 views
Dt acting on symbolic notational forms
This one must be simple, but I can't figure out a decent solution.
Suppose, I have a symbol with a notational form applied to it, say OverHat[A].
Now, if I didn't ...
