# All Questions

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### Getting too many errors while trying to contourplot

I am trying to contourplot deviations for various combinations of a,b,k,l with the following code. Clear["Global*"] ...
1answer
24 views

### What is the best source to learn how to use tensor operations (exterior algebra) in Mathematica?

I'm specifically interested in the TensorProduct,TensorWedge, HodgeDual and certain build in functions to do tensor arithmetic like TensorReduce, TensorExpand. I would like to do exterior algebra ...
1answer
11 views

### Labeling function: format of numbers

I think this will be easy for many of you, but I struggle. How can I make the label to be n.nn and not this hugely long numbers? See the screenshot.
1answer
675 views

### Expand wedge product

How can I force mathematica to expand for example this expression $$(\cos (\theta ) dr-r d\theta \sin (\theta ))\wedge (\sin (\theta ) dr+r d\theta \cos (\theta ))$$ into what is should be, that ...
1answer
96 views

I'm struggling a little bit trying to understand how to address this problem, I would like to do this in mathematica: is just that I don't know how to do the dot product between $\mathbf{J}$ and $\... 0answers 5 views ### set of ODEs with Integrate inside NDsolve? I have set of ODEs with integration and to be solved with NDsolve. But because of existance of Exp[-2 qr[z] r^2], I can not find the solution. By the way, if it is <... 1answer 28 views ### Why does ButtonBar ignore Background options? Notice how I have Background->color set in each BUttonBarbut it is completely ignored. How do I fix this? ... 1answer 34 views ### Solving a system of simultaneous equations with modified multiplication rules Hello and thanks in advance for your help. Is there a way to solve a system of simultaneous equations in Mathematica where because of the nature of the system being modeled, the rules for multiplying ... 3answers 2k views ### Eisenstein Series in Mathematica? Mathematica doesn't seem to have built-in tools to deal with the Eisenstein series:$\begin{align*} 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_{... 1answer 29 views ### Construct all possible 3-letter words from A,B. Repetition of letters is allowed I have two letters A and B. I need to construct all possible 3-letter words. Repetition of letters is allowed. I know that the answer to this problem is 2^3=8. But ... 1answer 70 views ### Incorrect result of DSolve Let us dsolve that Cauchy problem with 12.3 on Windows 10 Pro: ClearAll[w, z]; sol = DSolve[{w'[z] == -1/2 - Sqrt[1/4 - 3*w[z]], w[1] == -1}, w[z], z] ... 1answer 67 views ### Find FT and r.m.s noise of a signal I have a signal : ... 2answers 29 views ### Retain Edge Ordering in DAG Conversion I would like to convert an undirected graph into a directed graph such that for each tuple, the first value is a head and the second is a tail in a directed edge. Initially I thought using ... 2answers 69 views ### how to create a directed` bar chart This code was developed by @Jagra: ... 2answers 38 views ### Color-code edges by order in edge list Given a graph with vertex coordinates list V and edge list E, how can I visualize the order of appearance of edges in E? It is similar to this and this question which ask how to color-code points in a ... 3answers 1k views ### Run Python with package NumPy in Mathematica For example, if I have a Python script called simple.py that contains code as simple as a=1 print(a) then ... 1answer 77 views ### Solving a system of transcendental equations I am trying to solve the following system of transcendental equations: ... 0answers 16 views ### How to import variable definitions from a .mx file? I have a .mx file with the following format- x=2a+3; y=3b+5; How do I import this file into Mathematica so that x and y use the given definitions? 4answers 385 views ### How can I get information about properties of a style? I'd like to make some features of my notebooks responsive to some properties of styles in the active stylesheet. Is there a way to do this? I can't seem to get anything out of ... 0answers 34 views ### I am facing a problem to plot data [closed] I got the data but enable to plot. 0answers 39 views ### Solve Partial Differential Equation with Neumann Boundary Condition [closed] I am trying to solve the heat equation with certain boundary conditions (one-dimensional in space). I tried it this way: ... 1answer 39 views ### Mathematica help with NIntegrate I am fairly new to mathematica and I'm trying to generate an SIS s-wave IV plot using the formulae in the attached image. Could I get some help in fixing the issue? 0answers 47 views ### GAN LSTM Time Series Does anyone know if it is possible to use LSTM or another RNN in GAN architecture as the generator? Here a reference: 1 Thx! To clarify, what I am asking is it possible in MMA 12.3 (my current version)... 1answer 48 views ### Symbols for some icons What are the characters that give each of the following icons: The "i" information icon you see in the predictive interface and in the output box produced by an information request (e.g., ... 0answers 66 views ### Upgrade to 12.3 crashes Front end and Kernel after evaluating cell in any notebook Running Mathematica on Windows 10. Previous installed version was 12.1. This occurs on any notebook including created new one. My Mathematica worked just fine when it originally ran on 12.1. Not sure ... 1answer 16 views ### Why can't I get the argument for my base function from the transformed function? Consider the following transformed function as an example: ... 1answer 62 views ### Set a background color for several adjacent cells and “page” I'm using a book style sheet but this question applies to the standard notebook interface as well. I'm writing a sequence of cells in different styles (text, equation, figure, figure caption, ...) in ... 0answers 32 views ### What is the proper way to solve inequalities in WL? I often have to transform inputs of trigonometric functions which involve finding the new domain. The inequalities themselves are trivial to solve but they get tedious. ... 1answer 118 views +50 ### Intelligent text search on large directories of notebooks? I have a (deeply nested) directory containing 10s of thousands of wolfram files (mostly notebooks (nbs), but also scripts (.wls), packages (.m, .q wl), my and wxf data) and many subfolders each with a ... 0answers 57 views +50 ### Improving label collisions for Tree/Graph? Historically, MMA has never handled label collisions well, but recently they added some improvements here via things like Callout. I want to fix ImageSize but still ... 2answers 48 views ### PearsonChiSquareTest with experimental data including errors I have a set of data in the form {x,y}, and the corresponding errors: ... 0answers 9 views ### Wrong contraction in Feyncalc when restrictions are imposed over the metric I have the following tensor which I will manipulate in Feyncalc ... 0answers 27 views ### Resizing a notebook with a command I've got some notebooks which my friend wrote on a different computer, presumably with a much higher resolution screen to mine. When I try to open them on my computer, the window size of the notebook ... 1answer 88 views ### How does MMA return an unevaluated expression on errors without going into an infinite loop? [duplicate] Post-answer note: this question is (understandably) marked as a duplicate, and indeed has a similar solution, but is subtly different in focus: the linked question is about returning a function call ... 1answer 97 views ### extract COVID data across sub-regions of Asia and the Pacific The following code extracts COVID data of Germany and gives the time series of confirmed cases, deaths and recoveries: ... 0answers 54 views ### How to plot a 3D plot using a three lists? [closed] Suppose I have three lists as my data list1={1,2,3,4}; list2={10,20,30,40}; list3={100,200,300,400}; where I want to use 3Dplot so that ... 0answers 42 views ### Is there already a program that analyzes THz-TDS data in Mathematica? I plan to write a code that reads the time domain data(sample+reference), performs Fourier transforms, calculates transmissivity, solves the transfer function numerically, and gets complex refractive ... 1answer 91 views ### How insert into Text cell chevron symbols used for Inline GroupOpener icons? If in OptionInspector I select option "Inline" for Cell Options > Display Options > ShowGroupOpener for section-like cells, then when such a group is closed it shows an icon that is a ... 2answers 550 views ### How to use Python's Scipy, Numpy functions in Mathematica to find minimum of a function? I have written my code in Mathematica, final aim of this code is to find the minimum of a function. I found that FindMinimum and ... 0answers 45 views ### Problem with KarhunenLoeveExpansion's output I have a matrix called realizationMat, it contains 101 measurements of 90 realizations of a stochastic process. I will post instead an abridged 11*5 smaller example ... 0answers 54 views ### How to represent Spherical Coordinate System unit vectors? [closed] How to quickly represent a Spherical unit vector in Mathematica? Is it using the function UnitVector? 3answers 103 views ### How to collect a polynomial with a specific power Suppose I have got this polynomial u=x^12-3x^8-x^4+3 Now, I am trying to collect this polynomial with x^4 terms. I need to write it like this: (-1+x^4) (-3 + x^4) (1 + x^4) To evaluate it, I used ... 2answers 136 views ### How can I rescale / format chart elements in a bar chart? In this simple MWE, I create a simple chart element of a female figure, and then I apply it to a barchart, with the following code (note: womfig = this little stick figure here). ... 1answer 49 views ### How to ParametricPlot an InterpolatingFunction Hi I can Plot the result of an NDSolve (toy example), but I cannot ParametricPlot it. ... 1answer 80 views ### Why aren't my grid elements aligning correctly in a docked cells toolbar? The following is just the initial start of my very first docked cells toolbar I am still working on. It can easily be loaded to view it live. Code is also provided to conveniently remove it afterwards.... 2answers 195 views ### Integrating an exponential with upper incomplete gamma functions I would greatly appreciate calculating an integral consisting of an upper incomplete gamma function and an exponential function. ... 2answers 137 views ### Images as labels - resizing problem I'd like to label a pie chart with images, ideally resized to fit inside the sectors. The problem is I can't seem to control the size of the imported images. Here's an MWE with no attempt at resizing, ... 2answers 474 views ### How to generate all possible functions combinations Assume that I have 3 functions like this (total 10 functions in reality). f1[x_] := 3 x; f2[x_] := x^2 - 1; f3[x_] := 2 x + 5; Now I want to generate all possible ... 0answers 38 views ### System of Non Linear Equations [closed] I have a system with 7 equations and 7 unknowns with 11 parameters. I wish to get closed form solutions for each of those 7 equations. However, the system is non linear in the parameters which makes ... 1answer 68 views ### How to animate Laplace operator e^{-st} s =(\sigma+j \omega)\$ which is a spiral

like this I have read How to draw a phasor animation with Mathematica?, however,I am new to Mathematica Dynamic Interactivity as a Matlab user, I still not get used to Mathematica due to its function ...

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