# All Questions

4answers
95 views

### Need an efficient way to do this list manipulation

Lets say i have two lists with me as given below: l1 = {4, 6, 8, 9, 10, 12}; l2 = {2, 3, 4, 5, 6, 7}; Now i have a function S2P(details irrelevant) which takes ...
3answers
220 views

### BSplineFunction derivatives wrong if using weights?

In my work, I make heavy use of non-uniform rational B-spline (NURBS) functions, defined using the function BSplineFunction with the option defining ...
0answers
25 views

### Speed up adding Poisson noise to an image

I'm simulating some images corrupted with Poisson noise, but I'm encountering a few problems with performance. According to the documentation on ImageEffect, one ...
0answers
14 views

### Speeding Up Image Processing Functions

I am working with stacks of 1024x1024 timelapse microscopy images that I am performing a series of image processing functions on to help segment each image. These functions include Sharpen, Erosion, ...
0answers
20 views

### How to make equidistant list line [duplicate]

How to discretize following 3d line to get equidistant points while preserving the original line? These points are randomly distributed: ...
2answers
101 views

### Mathematica 10 Graph issue

Please try to evaluate this code in Mathematica 10. ...
3answers
106 views

### Can NDSolve handle discountinuos data?

It is possible to numerically solve a differential equation if not-smooth data are involved? For example the following instruction return the error NDSolve::bvdisc: ...
0answers
19 views

### Display ln instead of log in labels? [on hold]

I want to put ln(x) in a plot label (specifically in a legend label), but when I use LegendLabel->Log[x] it writes log(x). For complete clarity it would be ...
3answers
107 views

### How to generate and label multiple histograms as Query operator(s)?

The Dataset documentation doesn't indicate how to label a Histogram with the key. ...
2answers
63 views

### Speed of curated data calls in Version 10

Curated datasets underwent a significant overhaul in version 10, primarily in the way content is delivered in the form of Objects and Entities. Additionally, it appears that this change in content ...
1answer
35 views

### Overwriting first line of large file

As mentioned, I wish to read the first line of a file, and if needed, overwrite it with a new string. The aim is to have a CSV with a list of possible elements. Example: ...
0answers
33 views

### Random reals according to probability distribution [duplicate]

How do I generate a list a random real numbers that follow a probability distribution? If my pdf is $f(x)$, how do I "force" the random numbers to follow $f(x)$?
2answers
66 views

### How to insert zero counts uniformly with Dataset Counts query

Missing[] is generated when an association does not contain the specified key. ...
1answer
25 views

### CreateDocument options needed to suppress the default notebook menu

What are the options needed in Mathematica 10 to suppress the menu on top of any notebook created with CreateDocument? For example, the Messages window as well as the windows generated by ...
1answer
52 views

### How to know at which point of a calculation I am while using Table

If I use a code of this type: Table[foo[i], {i, 0, 10}] Mathematica won't output anything until it is done: is it possible to know at which point of the ...
1answer
72 views

### Need help in understanding code [on hold]

I am just beginning with Mathematica. I have received this code to study. I am not able to follow this particular section. I have tried looking it up on many forums, with no answer. Can you help? ...
1answer
30 views

### Change the size of a graphic inside a legend

I have this graph: ...
0answers
39 views

### Calculating power spectral density

I tried using PowerSpectralDensity, but its usage is very vaguely documented. It produces a sum of cosine functions. I do not know what to use it for. Is there some ...
2answers
495 views

### Check Google PageRank for a given URL

Does anyone know how to write a Mathematica function that returns the Google PageRank of a given URL? I found a tutorial for achieving this in a bash script here, but I have no idea how to port this ...
3answers
142 views

### Change the inner color of markers

I would like to have a marker with white as its inner color, to be able to make this kind of graph: If I use PlotMarkers -> Style["\[FilledSquare]", White], ...
0answers
81 views

### Developing easy code to apply Delta Method to generate prediction bands for custom distributions

I think that this is an interesting issue for all those who when to not only adjust one prediction function, but also to obtain the prediction bands to asses the graphical or tabular error I'm trying ...
0answers
38 views

### Benefit of using Dataset to collect SQLSelect output

Considering a DatabaseExample included with Mathematica: ...
1answer
66 views

### Setting a Row from a Matrix as Variable

I'm not advanced in Mathematica but I'm trying to get better. I have a big set of Data and I want to Plot the first row against ...
0answers
30 views

### BoxWhiskerChart with logarithmic axes 2

I actually already found my answer on the question, however it is not working. see BoxWhiskerChart with logarithmic axes I want to create a boxwiskerchart with a logaritmic axes. But when I try ...
0answers
41 views

### how to calculate the coordinate of a point which depends on other points on a plane with specific distances

I have 8 points on a plane (x1,y1)....(x8,y8) among these 8 points i know the coordinates for 7 points and i have to find the 8th point. Each points has the difference between all other points.i am ...
0answers
31 views

### Fit convoluted Gaussian and Lorentzian functions to a peak profile

Thanks in advance for anyone who read this. I have a peak profile data like this: ...
0answers
18 views

### Can I use in LogitModelFit boolean parameters?

For example, to use '1' as true and '0' as false: LogitModelFit[{{300, 0, 0}, {400, 0, 0}, {450, 1, 0}, {460, 1, 1}}, {x, y}, {x, y}] where ...
1answer
89 views

### Get the last line from each of a large number of files, transform them, and write all results to a single new file

I have several hundreds of .csv files that are not logically named (contains numbers, characters, and special characters), all stored in a directory. Each file has large but unequal number of rows and ...
0answers
69 views

### Annoying window. How to remove it?

How do I remove this window from my Mathematica?
0answers
74 views

### Check for holomorphy of a function

Given a (rather complicated) function H(z), what is the best approach to check symbolically whether it is holomorphic? What I tried is checking explicitly the ...
1answer
56 views

### GUI->Text code conversion

I have to solve about 30 symbolic equations simultaneously. Mathematica is taking more than 24 hours to solve it on a 6 core system and now I have to run that on a cluster. In order to do so I need to ...
1answer
50 views

### Why is either Listable or HoldFirst not working?

Starting with a fresh kernel, I evaluate the following: ...
2answers
68 views

### How to automatically plot asymptotes? [on hold]

I'm a newbie to Mathematica and I'm reading through "The Student's Introduction to Mathematica, Second Edition" and am on the "Using Mathematica’s Plot Options" section of chapter 3. The examples for ...
3answers
47 views

### Minimum and maximum values under conditions

Let's create some sample data ...
1answer
234 views

### Automatically lining up two images that have some common elements

Over on genealogy.SE, I proposed a method of manipulating images to make "bleed through" less visible and the handwriting on the correct side of the page more legible. Here are the original images: ...
2answers
45 views

### Show the arrows in a plot [on hold]

I have two plots: ...
0answers
25 views

### Simple Choice-Dialog like the auto-completion popup

What I want is pretty simple, nevertheless, after half an hour I have only unsatisfying solutions here. Let me ask you who might work more often with Mathematica's GUI elements: Is there a way to ...
0answers
32 views

### Export Plot to formatted data file

I would like to export the point drawn on a graphics made with Plot, to a file formatted in such a way to be importable in Mac Grapher. If I use Export, and I specify a .txt, it give me something with ...
4answers
212 views

### What is the natural way of using Dataset to get a FittedModel?

The new Dataset in Mathematica 10 is a great addition to the language, potentially reducing the convenience gap with R. Given this, I would like to understand what the equivalent simple or natural ...
0answers
43 views

### PlotMarkers problem in ErrorListPlot, Mathematica 10

I recently upgraded to Mathematica 10, very excited about the multiple undo function of course. However I very quickly noticed that if I specify a setting for ...
1answer
39 views

### Is it possible to plot a second-order curve by its non-canonical equation?

I have this second-order polynom: $$6xy+8y^2-12x-26y+11=0$$ And I need to reduce it to a canonical form of a second-order curve. I solved this, but is it possible to draw a plot of the original ...
0answers
22 views

### Is equation numbering in exported HTML considered deprecated for built in stylesheets?

So I've been tinkering around with the built in stylesheets and the Export command and I've noticed that in principle equation numbering should work. When you look ...
3answers
706 views

### Symbolic solution(s) to generalized Heat equation

Symbolic solution(s) to Heat equation? or more generally,(eventually) Green functions to known PDEs I am interested in variations of the heat equation: or more generally or even more generally ...
1answer
142 views

### How do I solve for one variable in terms of other variables in Mathematica?

I'm fairly new to Mathematica, and I'm trying to solve a complicated equation with multiple variables. I've tried the following... ...
1answer
76 views

### Integrating Mathematica in Blackboard

I teach Economics at University. I often use Mathematica to generate interactive diagrams with demand and supply curves. We also use Blackboard (blackboard.com) to manage our subjects, including ...
2answers
68 views

### Piecewise Polynomial Interpolation

Given some data pairs $(x_i,y_i)$, with $i=0,...,m$, and a degree $r$, I wish to build a piecewise polynomial function to interpolate these data. That interpolation should be continuous, and, on every ...
1answer
44 views

### Elements in Reap and Sow

Can someone help explain it to me: How does here e come out? Why b disappears? ...
1answer
57 views

### How do I constrain variables to a user-defined domain in ArgMax?

I am trying to ArgMax a function over x, but x is only defined between ...
3answers
176 views

### Sum with Levi-Civita

I'm trying to write the expression $$\sum_{\alpha,\beta = 1}^{4}\epsilon_{\mu \nu\alpha\beta}a^{\nu} b^{\alpha} c^{\beta}$$ in Mathematica, where $\epsilon$ is the Levi-Civita symbol and $a$, $b$, $c$ ...
3answers
139 views

### Zero-order interpolation not going fully around

Connected to this question, I want to do a zero-order interpolation of a bunch of datapoints which is periodic. The code I use is as follows: ...

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