# All Questions

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### Trouble solving a system of partial differential equations [closed]

I am trying to solve a system of linear PDEs analytically and I dont get the answer. I am new to this tool, appreciate your help ...
57 views

### How to repeatly use random number generator in optimization problem

I am looking to run the optimization problem. I already finish my optimization code as below. ...
244 views

### How to use Feynman Slash notation?

How can I use Feynman slash notation, e.g., $\require{cancel} \cancel{A}$, in Mathematica? I've seen some answer from 2008 which doesn't seem to work well in Mathematica 10. I'd like this to be part ...
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### What is Mathematica's comment-to-line-end token? [duplicate]

How can I make a full line of code into a comment by typing a single character inserted at start of the line? In other programming languages I can use characters such as ! , # and language processor ...
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### Plotting a dispersion curve with complex wavevectors [duplicate]

I want to reproduce a dispersion curve from P. Zou's thesis found here: http://www.ipd.anl.gov/anlpubs/2001/06/39620.pdf on Pg. 31, Eq. 2.13. The problem is, the code below only gives values for the ...
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### Orthogonalization is not commutative!

I get stuck into a problem: I am going to produce orthogonalized eigenvectors of a matrix and in any iteration. I shortened my question in the bellow line: Why do we face to different results of ...
141 views

### Select largest number using pattern

I have the following expression: myExpr=R[C[2],B].(II+R[C[3],C[2]].(II+R[C[4],C[3]])) I need to create a pattern which would replace the ...
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### Easy way to solve a matrix equation for a matrix?

I have two sets of $10\times 10$ matrices $M1,M2,M3,M4,M5$ and $N1,N2,N3,N4,N5$ and I want to solve a set of equations for these matrices ...
38 views

### Working with Piecewise functions - Hexsplines

I'm trying to use the convolution definition of hexsplines, that is, a hexspline is the convolution of the indicator function of a hexagon (of sidelength 1 and centre $(0,0)$ ) with itself. I'm ...
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### Mathematica package for explicit matrix representations of group generators?

While there are several packages that are capable of working with weights and roots (for example LieArt), I couldn't find any package that spits out explicit matrices for the generators, for example ...
81 views

### ListContourPlot3D drops data

I've generated an array of datapoints depending on three Variables and need to plot them in a comprehensive way. Easier than dividing the data into subplots of fixed variables, ...
226 views

### Extrema of a function of three variables

To identify and classify the critical points of the function $f(x,y,z)=x^3+xz^2-3x^2+y^2+2z^2$, I used the Hessian matrix method. ...
135 views

### Run mathematica scripts without initializing the kernel every time

There are two duplicate's of this question that seem to only work on linux/osx currently. So how can I viably run mathematica scripts without spawning a new session each time from command prompt? I ...
56 views

### Using Get function to return a specific expression

I am trying to use Getto import data saved as a .nb document. The problem is Getevaluates all expressions but only returns the ...
86 views

### Spurious infinite limit of integration message in NIntegrate

Bug introduced in 7.0 and persisting through 10.2 NIntegrate returns an error complaining that ComplexInfinity is an invalid ...
319 views

### Find all synonyms of word X that rhyme with word Y

Given two words x and y, I'd like to find the set of all words that rhyme with x and are synonymous with y. Is this possible with WordData or ...
159 views

### Different Set Semantics - Why is assoc[“a”] =. different from assoc[[“a”]] =.?

Accessing parts of an Association can be done either using Part or the [] extraction ...
90 views

### JSON Expandable/Collapsible Fields with OpenerView

When you have a deeply nested hierarchical JSON structure, tools like JSON Editor Online help a lot to get an overview of the structured data at various levels. In this way you control the ...