# All Questions

544 views

### How does Mathematica's LowpassFilter work?

I don't really understand the documentation for the LowpassFilter[] function in Mathematica. In the course I have about signal processing, low-pass filters come in ...
908 views

### mathematica for learning? [duplicate]

Mathematica looks like an extremely powerful tool. I would love to have it in my toolbox. Unfortunately, I can hardly add two numbers together. I think the application of math through programming is ...
940 views

### Integration strategies for oscillatory multidimensional function

I am seeking to integrate a highly oscillatory, multidimensional function. I am currently using NIntegrate's QuasiMonteCarlo approach. However, this is time-consuming and, given my current resources, ...
503 views

### plotting output from FindRoot

I am an R user and am totally new to Mathematica. I am trying to find the roots of a system of two equations over a series of paramter values and plot the results. I can do the computation but would ...
327 views

### String pattern search and replacement — it works, but produces error messages only the first time it is called

I defined a function in Mathematica to process a pre-generated string. More specifically, I'd like to process some parts of C codes generated from MMA. Basically what my function does is to expand the ...
1k views

### How can I compute and plot the 95% confidence bands for a fitted logistic regression model?

I have a set of binary data that I' d like to fit a logistic regression model to and show the 95% confidence band around the fitted function. I can produce the regression model but how do I compute ...
67 views

### Adjust the results of evaluating Table so it can be used as a argument to Point

I have a list generated by Table as below. ...
184 views

### Trouble with Minimize

Minimize[{t^2, 1 == 3*t + 16*u}, {t, u}, Integers] It does not give the solution t = -5 and u = 1. Am I missing something? The solution being known and ...
181 views

### Poor Graphics3D rendering

I am rendering a world environment simulation in Mathematica with Graphics3D code: ...
111 views

### Displaying Values of Fuction at end of Period by Grid

My intention is to place the values of two function into a small box within my chart. To be more precise I have two vectors. A meanvector which shows the average value of all simulated stochastic ...
218 views

### Preventing notebook cells from being broken across two pages when printing

Sometimes I create a number of plots together, e.g. by GraphicsGrid[]. If it happens that I have to print the notebook, very often the cell is broken, half on one ...
459 views

### Bar Chart Labels Mystery

I have some data which I want to plot in a simple bar chart: ...
596 views

### Numerical contour integrations in the complex plane - contour deformation gives different answer for analytic kernel

I am trying to do a contour integration in Mathematica numerically. In particular, I'm checking the identity:  H_m^{(1)}(z) =\frac{i^{-m}}{\pi}\int_{-\pi/2 + i \infty}^{\pi/2 - i \infty} \exp[i m ...
186 views

### Use JavaScript to evaluate webMathematica tags?

In my HTML form I have 3 buttons. Each button calls different .mx files, based upon an .mx file data. ...
341 views

### Scatterplots for subsets of multivariate data [Updated]

Update/Re-write There has been a lot of ambiguity over what i'm am trying to do with this question so I have decided to give it a full rewrite. I'm really sorry for the confusion. If you want to see ...
119 views

### space lost when converting inline cell to tex

Sample Cell 1 words with spaces in one inline cell ...
289 views

### Disk is displayed distorted in plot

What is the problem with my plot? I want to get a disk shape. ...
482 views

### Partitioning a list by recursion (Programming Paradigms via Mathematica (A First Course))

I am working through the course Programming Paradigms via Mathematica. One of the homework exercises for the section Recursion I: Passing the Buck is as follows: Use recursion to partition a ...
73 views

### Will aliasing the Quantity and UnitConvert functions to “in” and “to” create problems?

It seems that there is a lot of interest in enhancing the use of units in Mathematica; various solutions in the name of brevity, correctness, and general utility have been demonstrated. I've begun ...
38 views

### NIntegrate issue to do with unknown types [duplicate]

I have a numerical function zz: zz[s_ ? NumericQ] := so3toE3[Inverse[yn[s]].ND[yn[k], k, s]]; The other functions involved have 2 pages of code defining them so ...
675 views

### Twirl Image Transformation

I am looking to reproduce the functionality of Photoshop's "Twirl" filter, which twists an image that originally looks like this (pulled from this page): Into this: Ideally, I'd like it to ...
630 views

### Combining the second elements of a set of ordered pairs based on their first element [duplicate]

I have a large set of ordered pairs and I am trying to add the second elements together for any group of pairs that has the same first element. For example my data looks like: ...
130 views

### Odd edge-case behavior of Block

In this example, Block is used to localize the variable cache as used in the function g when called from the function ...
455 views

### How to Export the current graphic state of a dynamic module?

After manipulating the graphics in a dynamic module like this: Synchronizing manual rotations for multiple Graphics3D outputs? How do I get at the current graphic so that I can Export the image? ...
170 views

### How can I program the RiemannR function using the LogIntegral command?

I would like to program the RiemannR function using the LogIntegral command because I would like to later experiment with a ...
246 views

### Random variates in Recurrence Function

I'm completely new to Mathematica and can't seem to find an answer elsewhere so hopefully I can get some help here. I'm trying to plot a recurrence relation, where a random variate is generated at ...
267 views

### point-wise transform of Plot

Suppose I have the following plot: Plot[(1 - p2)^2/(p2^2 + (1 - p2)^2), {p2, 0, 1}, AxesLabel -> {"p2", "p1"}] Now I want to do a point-wise transform to ...
180 views

### Stopping- threshold and stopping- time of stochastic processes.

Rod Lm helped me to generate the following code, which I want to extend a little bit. So my intention is to use the threshold (the green line) as boundary in the following way: as soon as the process ...
1k views

### Plotting a Complex Valued Function

Suppose that a complex valued function f[z]=f[x+i y]=u[x,y]+i v[x,y]. I want to plot3d its real part by coloring it with respect to its imaginary part. For ...
188 views

### Running out of memory using FindMinimum with ParametricFunctions

I am running a pretty large optimization problem which actually consists of an outer an inner optmization problem. I use ParametricNDSolve for solving a ODE system. When the optimization is done, ...
149 views

### making a function of fit results

I have 13*25 datasets consisting each of around 40 points. They are all linear I can easily fit them using fit function but my problem is when I want to call them I want them to be functions. I want ...
738 views

### How to prevent Mathematica combining similar terms?

For example, given: x + 2 x y - x y + y I need to put it in this form: x (1 + 2 y) - y (x - 1). But Mathematica will simplify ...
145 views

### Scripting a visual comparison between the derivative and some finite scheme

I want to make an application where I can specify a function $f:\mathbb R\to \mathbb R$ and a dynamic value $n$ and get the function $\frac{f(x+\frac{1}{n})-f(x)}{\frac{1}{n}}$. I moreover want to ...
211 views

### How to add rows to a Grid in front end?

I created a grid g1 with Grid[] and then a separate grid g2. ...
305 views

### How to decompose a complex expression containing repeated subexpressions? [duplicate]

Suppose I have an expression like ...
822 views

### How accurate is GeoDistance?

Two years ago I tried an evaluation copy of Mathematica. I reported various inaccuracies in the GeoDistance routine to which I never received any fix. Could ...
123 views

### Split A text-style cell to multiple cells by a fixed width

Sample Cell 1 ...
323 views

### How to check if a given expression is an “explicit algebraic number”?

The documentation for PossibleZeroQ says: With the setting Method...
570 views

### Making a ListVectorPlot3D from data in an external file

I have a .dat file with six columns: {x y z vx vy vz}, where x, y, z are space coordinates and vx, vy, vz are the vector components. How can I use this file to get ...
377 views

### NonLinearModelFit with Two Dimensional List of Weights

I'm currently trying to fit Planck's law (B[λ, T]) to measurements, thereby determining Planck's constant. I have a list of triplets containing wavelength, ...
148 views

### What is the fastest way to get a list of subexpressions and their positions?

I have spent quite some time trying to figure out what the fastest way is to get a list lists of all subexpressions and their positions. I have tried things with MapIndexed, which seems ideal in cases ...
127 views

### Unexpected result for Coefficient[]

Is this just me being stupid, or is this a known bug in Mathematica? Coefficient[2 x + 2 y, x + y] gives 0, while ...
169 views

### How to check an algebraic number for membership in a list

I need to check an algebraic number for membership in a list of algebraic numbers. The numbers can be expressed in different forms (combinations of radicals, Root ...
240 views

### Subset of edges with a different color

I want to color a subset of the edges of my graph with a different color. My graph currently has a large number of edges, so the following is just a toy example ...
165 views

### Basic question on producing non-overlapping graph nodes in a graph

I am plotting a graph which has about 196 nodes. ...
149 views

### WeatherData acquirement in ListStreamPlot

I am trying to show the wind streams in a geographic area as following code for a range of time.Even if it works for realtime data but it doesn't work for range of time.I am filtering and also taking ...
350 views

### Mesh inside Plot legend

I have a plot for which I would like to create an legend that is black and white printer friendly. I have seen Jen's legendmaker but I don't know how to adapt it. I need help in making the legend for ...
165 views

### Using a List in PlotLabel which goes beyond width of ImageSize

My PlotLabel goes beyond the width of the ImageSize. The label is generated into a List form ...