2
votes
0answers
66 views

The most simple Manipulate freeze the notebook on v10.1

I realize this won't be a particularly clear question. As I'm not able myself to find a pattern for the problem I'm talking about I won't be able to give enough informations to make it fully ...
0
votes
0answers
49 views

Modify measured values to improve NonlinearModelFit results

Problem: Measured data points have a random distribution of DC offsets (either +/- 0.65 mV), that came from an incorrect setting on the 24-bit ADC we were using. Essentially for each measured voltage ...
0
votes
1answer
51 views

Partial derivatives with respect to multiple variables

For any natural number $N$: $$_t k_{mn}^1 = \frac{1}{m!n!}\frac{\partial^{n+m} k_1 (0, 0)}{\partial x^m \partial t^n}, \qquad (m,n=0,1,\ldots, N)$$ where $k_1(x,t)$ is a known function, for example ...
1
vote
0answers
114 views

Numerical solution to integral equation

I have an integral equation where one factor $f(t)$ in the integrand is defined in terms of an integral equation where it is again a factor. $\quad \quad y[t]=\int _0^tf[\tau ]g[t-\tau ]d\tau + ...
-2
votes
0answers
44 views

Find list element matching pattern

I have the following list: {A , B.C , B.C.S[d].S.F} I need to find the index of all elements containing S[d].S, i.e. an ...
0
votes
1answer
53 views

kernel density estimation

I am trying to compute CDF of historical data ( weekly change in CDS spread) using kernel density estimation. The original data has 300 observation. I uploaded data from excel ...
9
votes
1answer
195 views

Why doesn't Mathematica evaluate this simple limit?

I want to evaluate $$\displaystyle\lim_{n\to\infty}\left(n-\sqrt{\sin(n)+10n+n^2}\right)^2$$ I used this code ...
0
votes
0answers
37 views

Adding known error bars to a bar plot [closed]

I want to add error bars that I already have calculated onto my bar plot. I can't seem to find a function that will do this. I've found ways to enter all the data and have Mathematica calculate, and ...
0
votes
1answer
38 views

Axeslabel doesn't work when using Frame and FrameTicks,

I'm using FrameTicks and Frame to get a second y-axis. But then my axes labels disappear. I've solved it by using ...
0
votes
0answers
24 views

Error message from Histogram [closed]

I uploaded historical change of data (it is change in CDS spreads) and am trying to plot a histogram and get a kernel density estimation. I am executing the following ...
2
votes
2answers
66 views

How to transpose x and y axis on a LogLogPlot?

how can i exchange x and y Axis of this loglogplot? ...
4
votes
1answer
124 views

Dealing with 6 VERY large equations. Am I doing this correctly, and can I expect a solution?

I'm new to Mathematica, but so far, everything seems straight forward and intuitive, which is really nice. However, I've come to use this software since I have to show a rather nasty 3x3 matrix is ...
1
vote
0answers
57 views
+50

The module load only works for the first node, not all. Is there's a way to specify the full path to the math command when launching remote kernels

Running a Mathematica .m file in cluster for parallel computing. But get an error "bash: math: command not found". Is there's a way to specify the full path to the ...
18
votes
2answers
231 views

Dataset seems to break Information

Bug present in version 10.2 My little function, from pre-10.2 ,to turn a headed table into a Dataset. ...
0
votes
1answer
62 views

Match a variable name pattern [duplicate]

I have a list of variables: {RBI,RCD,ASD,FGH} I want to select only those whose name starts with R. Using the pattern Rx_ ...
0
votes
2answers
46 views

How to make Mathematica to assemble components we already have like a regular input

Suppose we have the following list: {5, 3} I want to add the -> to the end of the first element in the list in Mathematica ...
2
votes
1answer
44 views

Polynomials with integer coefficients vs. polynomials with rational coefficients

My problem is very simple. From two different functions $f_1$ and $f_2$, I create two multivariate polynomials. Because of theoretical reasons those two functions (evaluated with the same input $x$) ...
0
votes
0answers
17 views

Question regarding derivation of Interpolation functions [duplicate]

I am new to Mathematica. Can someone explain what is the difference between the second and third input (54 and 59) in following example (got from Mathematica site). In[52]:= ysol = ...
4
votes
3answers
129 views

How to simplify 1 - Cos[2x] to 2 Sin[x]^2?

I want to reduce all Cos[2 x] to 1 - 2Sin[x]^2, it seems Mathematica will always simplify ...
0
votes
0answers
33 views

Multivariate interpolation [closed]

I need to interpolate a function of 5 variables. I have 72 values of this function. f(12, 0, 50, 1, 0) = 3.28, f(12, 0, 50, 1, 50) = 3.35, etc. Do you know which ...
2
votes
1answer
83 views

What role to sub/superscripts play in Mathematica?

I'm not sure I understand the role of subscripts and superscripts in the Mathematica language. For me, the expression: ...
4
votes
1answer
55 views

Custom fonts show as boxes when opening Mathematica-made PDFs with Illustrator

If I export a PDF from Mathematica, then open it with Illustrator, the font glyphs will sometimes appear as boxes, depending on what font was used. Why does this happen? Is there a workaround? I ...
2
votes
1answer
42 views

Using Compiled Function in Implicit Region

I am looking for a way to speed up code and thus would like to use a compiled function in an ImplicitRegion. Here is an example of a region that can be plotted ...
1
vote
0answers
27 views

Imported variables (.mx) are emptied occassionally (Linux, v10.0.2)

I have a severe problem with variables being "emptied" occassionally. I am not able to reproduce the behavior but this is basically what happens: 1) store list ...
-2
votes
0answers
41 views

Developing an application to build the closet [closed]

I would like to develop an application to build a closet and calculate the cost, What is the language to do that?
1
vote
0answers
28 views

Why doesn't Import work with XOWA offline Wikipedia database?

I'm having trouble with importing HTML from XOWA offline wikipedia database. I set up a local server for datamining, but I can't access it with Mathematica. I can request a HTML page with ...
6
votes
2answers
312 views

Given a set of four linearly independent vectors, how can I compute two additional linearly independent vectors?

I have four linearly independent vectors: $$ \left( \begin{array}{c} \left\{\frac{1}{2},\frac{1}{2},0,0,0,0\right\} \\ \end{array} \right)$$ $$ \left( \begin{array}{c} \left\{\frac{1}{2 ...
2
votes
1answer
90 views

How to map an inequality to a list?

vars = Table[Subscript[a, j], {j, 5}] We can do the total Total[vars] and produce ...
0
votes
0answers
27 views

Get determinate values from XML [duplicate]

The following code gets a xml file with too much attributes of a car, but I want some of them only, what is the best way to do it? ...
0
votes
1answer
25 views

Expanding a function with trigonometric expressions in a controlled manner by excluding addition identities

I want to simplify a nonlinear equation with trigonometric terms. After I've expanded I don't want to loose open terms to Trigonometric Addition Formulas ...
0
votes
1answer
61 views

Why does this evaluate to {}?

I'm stuck with what seems to be an extremely simple issue, still, I just can't seem to find the solution or even the cause of the problem. So my issue is that I have the following surfaces: ...
2
votes
0answers
41 views

Parallel evaluation of symbolic matrix eigenvalues

I'm trying to find eigenvalues of symbolic hermitian 40x40 block matrix. It is made from 20 2x2 matrices like this: ArrayFlatten[Table[M[m,n],{m,1,20},{n,1,20}]] ...
1
vote
1answer
40 views

Visualisation of feedback loops in a directed graph

Here are the nodes (vertices) of my graph: ...
2
votes
3answers
114 views

Join nested lists based on first and last elements within each list

I have a nested list like this: test1 = {{1, 3}, {1, 4}, {1, 7}, {2, 1}, {3, 5}, {4, 1}, {5, 2}, {6, 1}, {7, 6}} I want to join the lists together depending on ...
11
votes
0answers
88 views

HistogramList is much Slower in 10.2 vs 10.1

While I was running a code I wrote using version 10.1, I noticed that in version 10.2 the running time of the same code was more than twice as long. After some digging, I figured out the culprit is ...
2
votes
1answer
58 views

Blank plot when using WorkingPrecision

I have the following code: Inv=WeierstrassInvariants[{1,I/3}] ...
1
vote
0answers
41 views

How should I iteratively refine a MixtureDistribution?

I am trying to find a stopping time for a randomized simulation such that say 95% of trials that will be successful will have already finished. I would like to do this by creating and then refining ...
3
votes
1answer
53 views

Display frame-tick labels on top side

I am making a standard framed Plot and would like the frame tick labels for the horizontal axis to appear on the top frame edge. I know I can do this by hand ...
0
votes
0answers
39 views

sum and infinity [closed]

I posed this question a few days ago that is no answer, but now I will clarify. If you have the sums $ (1+2+..+n) + (1+2+3+..+n-1)+ (1+2+3+..+n-2)+(1+2+3+..+n-3)+...+(1+2+3)+(1+2)+1$ for large ...
0
votes
2answers
41 views

Defining an array of functions with multiple indices and one variable [closed]

I have a function f of one variable x and a 4 x 3 array ...
0
votes
3answers
142 views
+50

How to parallelize a Do loop containing URLFetchAsynchronous?

I'm have a simple piece of code: results={}; Do[If[!FailedQ[g = grab[i]], AppendTo[results, g]], {i, 2000000, 3000000}] I had thought that the simplest way to ...
5
votes
2answers
84 views

How to stop solving after one solution is found?

With[{P = 12}, Solve[{a^2 + b^2 == c^2, a + b + c == P, 0 < b <= a, c > 0}, {a, b, c}, Integers]] {{a -> 4, b -> 3, c -> 5}} ...
1
vote
0answers
39 views

Reducing quantile & color map queries for use with Associations

This set of queries perform basic maps to quantile and then color-map. There's got to be a more compact solution. What are some approaches to reduction? Numeric: ...
0
votes
1answer
33 views

How to extract an association with similar keys from another association?

Considering we have an association like: ...
0
votes
2answers
49 views

Identify a scalar, a list

I have a symbolic scalar m2 and a symbolic list (representing a 3x3 matrix) A. I want a function which does something like: ...
3
votes
1answer
64 views

Solve: Changing parameters breaks the solution

I have the following code: ...
6
votes
5answers
340 views

Help remove annoying vertical lines in a piecewise plot

I use the following codes to define and plot three piecewise functions. ...
0
votes
1answer
77 views

4D rotations of 600-cell to make cell centered stereographic projection

I have made a 600-cell wireframe model from Eric Weinsteins' 2/13/14 600-cell notebook (600-cell: a regular polytope, 4D, analogous to the icosahedron, with 600 tetrahedral cells, 120 vertices, 720 ...
0
votes
0answers
55 views

Installing the HypExp package

I am trying to download the package HypExp for expanding hypergeometric functions in terms of logs and polylogs. As far as I understand and read from online, one way to do this is to go to File then ...
1
vote
0answers
84 views

How can I solve the 2D Laplace equation with Neumann boundary conditions? [closed]

I would like to solve the following boundary value problem for $u(x,y)$: PDE $\quad \quad \frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} = 0$ Domain $\quad \quad 0 \le x \le ...

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