1
vote
0answers
38 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: ...
1
vote
1answer
120 views

Appending elements to a list in parallel table

Is there any way to store values in a list that is being computed in parallel? For example, if ParallelTable is computing some ...
5
votes
3answers
213 views

How to imitate list comprehensions for constant arrays?

In Python, ['a'] * 10 generates ['a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a'] and ...
0
votes
0answers
78 views

Why does this Graphics3D example change lighting on reorient?

What I do: Graphics3D[{Sphere[]},Lighting -> "Neutral"] What I get: but when I reorient: What I want: a stable result! PS The Platform is Wolfram ...
-4
votes
0answers
37 views

If a given # is 70% of X. How do you determine what X is? [on hold]

given I have the number 50,000 which is 70% of X. How do I calculate what X is without guessing. Thanks
3
votes
3answers
164 views

Inefficient NIntegrate and Which

In version 10 a simple numerical integraton of piecewise function is highly inefficient: ...
1
vote
2answers
216 views

Problems finding intersection points between line and generic function

I'm trying to find Intersection points between a line, which is given by 2 points, and a generic function (I want it to be able to handle polynomial functions, circles/ovals, lines and all ...
0
votes
0answers
34 views

How to change number form of Plot Legend in ListContourPlot? [on hold]

I am creating a ListContourPlot from some very large values. I would like these numbers to be written out in scientific notation (8x10^8, etc.) I've tried the following code: ...
1
vote
2answers
87 views

How to write a loop

I try to create a table which will describe traffic paths at a crossroads. Instead of using copy-paste repeatedly, I would like to write a loop. For example: ...
3
votes
0answers
47 views

How to produce timely spoken text?

On my system (Mac OSX 10.10.4) the following code produces only the first utterance. The second one is produce when the user interacts in some way with the front end (mouseover, mouseclick). How can I ...
18
votes
1answer
176 views

Systemic bugs in GraphPlot and related functions such as TreePlot and TreeForm

Bug introduced in 7.0.1 or earlier and persisting through 10.2.0 I believe I have come across a rather curious bug in TreeForm: ...
0
votes
0answers
8 views

Don't understand about how to solve the first equation with Gauss Elimination [migrated]

Please take a look at the picture. My quesion is: How to solve the first equation with Gauss Elimination that is displayed in the picture. I don't understand HOW.
4
votes
2answers
44 views

Inputting values into the variables without having to input the matrix all over again

I'm practicing using LU decomposition on Mathematica. I am able to find the L & U matrices, specifically the variables. However, i find it tedious having to input the newly found values and form ...
4
votes
3answers
267 views

Implementing Picard's Iteration for solving ODEs

Picard's Iteration is a way of solving the IVP $$y'(x)=f(x,y(x)), \quad y(x_0)=y_0 $$ It consists of defining the following sequence of functions recursively: $$y_0(x):=y_0 \\ ...
2
votes
1answer
121 views

Equation involving hypergeometric functions

I want to solve this equation but nor NSolve nor Solve are able to do this. ...
6
votes
2answers
240 views
6
votes
0answers
36 views

Override a PlotTheme element at the Options level?

Plot properties defined in a Theme override (supersede) properties defined on Options. This can be undesirable in a case such as: ...
0
votes
0answers
4 views

How to solve a equation task [migrated]

I have found a equation task that is: y=0,5x+2,5 y=3x-1 The answer and its process is: ...
1
vote
0answers
40 views

How to segment letters and text blobs?

This new article from Google research describes how their Translate app preprocesses an image on a phone before applying convnets: It needs to weed out background objects like trees or cars, and ...
7
votes
0answers
76 views

How to make a Nebulabrot?

A Nebulabrot is a generalization of the Buddhabrot, a fractal rendering technique related to the Mandelbrot set that sort of looks like a meditating buddha. The Buddhabrot rendering technique was ...
14
votes
1answer
262 views

What Method options does FindInstance accept?

While answering Trouble getting FindInstance to return multiple results for certain constraints it became clear that for this problem FindInstance would be better ...
0
votes
1answer
105 views

How may I avoid ParametricPlot3D clipping? [duplicate]

What I am doing: ParametricPlot3D[{Cos[z/2]^6 * Cos[t],Cos[z/2]^6 * Sin[t], z}, {t,-Pi, Pi},{z,-Pi,Pi}] What I get: What I want: what I get, but without the ...
3
votes
2answers
71 views

Find sub-sets of vanishing additions or subtractions from a list?

Let's say I have a list L containing n numerical numbers. Now I want to find all sub-sets of ...
0
votes
0answers
21 views

Vector field plot not appearing in VectorPlot3D

I am having trouble in plotting the vector fields - Bfield and Avector - with the VectorPlot3D function. Here is the code used to Compute Bfield and Avector: ...
0
votes
1answer
65 views

How to disqualify a rule [on hold]

Executing this line Assuming[x < 0, x -> 10] Expected output: False Say x -> 10 is a root of a polynomial ...
12
votes
1answer
196 views

How to monitor the progress of training a classifier?

I've had p = Predict[x -> y] running for hours and I have now idea if I should kill it or not. I'm looking for some rough bounds for an estimate of how long ...
1
vote
2answers
38 views

How to define a function `deriv[f[x]]` such that its output is an unevaluated expression `fx=D[f[x],x]`?

I want to define a function deriv[f_[x_]] such that when I run deriv[f[x]], the output is an unevaluated expression ...
1
vote
2answers
37 views

What can I use as an equivalent of python zip in mathematica inside of Sum[]? [on hold]

I want to take two lists of the same length: widths and weights, and sum a function (of 3 variables) over a single index using the elements from both lists that have that index. Then I want to plot ...
16
votes
5answers
1k views

Insphere for Irregular Tetrahedron

I am looking for existing Mathematica code to compute the unique sphere inscribed inside an irregular tetrahedron. I can write it myself, but I would love to find that someone already performed this ...
1
vote
2answers
35 views

Error Resulting from Placing a Dynamic Variable inside of Table

I want to create a list of values, True or False, and to update those values with a ...
2
votes
0answers
59 views

What am I missing in this highly oscillatory integral?

I want to numerically integrate this equation (in python without calling Mathematica): $\int_0^\infty {\rm d}k f(k) J_v(r k) J_n(s k)$ where $f(k)$ is a non-smooth function, $J_v$ are the Bessel ...
0
votes
1answer
49 views

Count participation of variable list

I have the directed edges of a graph given by a list of variable (vertex) pairs. ...
3
votes
0answers
50 views

Where's the service status page for Programming Cloud?

I've searched wolframcloud.com and found none. It would be good to know, because I am getting a range of apparently random failures from "Tag List ... is Protected" to "possible crash" (!) to "Cloud ...
2
votes
0answers
58 views

Eisenstein Series in Mathematica?

Mathematica doesn't seem to have built-in tools to deal with the Eisenstein Series: $E_{2}(\tau)= 1-24 \sum_{n=1}^{\infty} \frac{n e^{2 \pi i n \tau}}{1-e^{2 \pi i n \tau}}$ $E_{4}(\tau)= 1+240 ...
0
votes
0answers
29 views

Interpolating function for data with five independent variables [on hold]

I have to optimize the risk reward of a financial structured product depending on several variables: the tenor (between 12 and 36 months), the type (american, european), the Knock In (KI) ...
8
votes
0answers
192 views

FindRoot kills kernel

Bug introduced in 7.0 or earlier and fixed in 10.1.0. I'm having problems with FindRoot killing the kernel. In my real application, I want to ...
16
votes
0answers
2k views

How to visualize Riemann surfaces?

In WolframAlpha we can easily visualize Riemann surfaces of arbitrary functions, can we plot the Riemann surface of an arbitrary function using Mathematica and ...
4
votes
0answers
69 views

Extraneous reaped data with NDSolve and WhenEvent

Bug introduced in 9.0 or earlier and fixed in 10.1 In exploring What is the range of values $x$ for which $f(x)$ is higher than $k$ over a given domain?, I came across the following strange ...
8
votes
1answer
92 views

Iterator variable not blocked in ParametricPlot

Bug introduced in 10.0 and persisting through 10.2 or later It appears that perhaps the iterator variable r is not Block-ed ...
11
votes
1answer
167 views

Using Simplify on a consistent system returns False

Bug introduced in 8.0 and persisting through 10.2 or later It's late, but am I missing something here? Why should two independent equations, which together are consistent, ...
11
votes
0answers
202 views

Bug in plotting function using FindMinimum?

Bug introduced in 10.0 and persisting through 10.2 or later While working on an answer to RegionPlot from NDSolve, I came across this strange behavior of ...
4
votes
1answer
106 views

LogLogPlot plugs in zero

Bug introduced in 10.0 and fixed in 10.0.2 In testing the answers to Plot result of non analytical-integral in V10.0.1, I came across this behavior of ...
3
votes
0answers
31 views

Tracking features where ImageFeatureTrack finds none?

How is it possible to track common features in the following sequence of images (e.g. holes or corner points along the top margin), ? I have had no luck with ...
23
votes
1answer
2k views

Upgrade to Windows 10

Can users of Mathematica on Windows 7 or Windows 8/8.1 upgrade their computers to Windows 10 – a process that began today? Does Mathematica work? Are all the settings, licenses, access to files and ...
32
votes
2answers
760 views

String-manipulation bugs in v10.1

Fixed as of 2015-04-06 via paclet update. The new version 10.1 has introduced some strange (possibly buggy) behaviour compared to v10.0: ...

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