# Questions tagged [broken-code]

Use this tag only if you did your research and you still don't know why your syntactically correct code does not work.

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### Fixing a code which covers $[-k,k]\times[-k,k]$ for a given $k\in\mathbb{N}$, with smaller rectangles of equal area?

Motivation: From this post we, initially, wanted to cover a rectangle using smaller, non-overlapping rectangles with the same area: the difference between the total area of the smaller rectangles and ...
1 vote
70 views

### Labeling point coordinates in path graph using VertexLabels

Question: How do we label point coordinates in Pathgraph using VertexLabels. Suppose we have a list of points ...
51 views

### Part specification error

I am doing a solved exercise shared here. However, while running the code, I encountered an error on page-8, under the Dynamics section. with error : I think this error is due to the absence of ...
164 views

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60 views

### Why does the following code not change the table?

Consider the following code: ...
272 views

### Why are the results of these codes different?

I apologize for the very long question with a relatively complicated code. I am dealing with a real problem, and the question below appeared from my attempt to simplify this problem to ask about it ...
264 views

### Efficient generation of n-bit base-m Gray code with adjacent bit changes

How can I generate n-bit base-m Gray code in Mathematica, where only 1 bit changes at a time and all possibilities are covered? I have been hitting my head against a metaphorical wall for a few hours ...
120 views

### Why does introducing value of variable for NDSolve via function not work for this problem?

I am very confused and even restarted Kernel several times (Mathematica 13.1 Windows 10). However, I fail to understand why one evaluation of NDSolve works while a ...
1 vote
259 views

### Creating an interactive plot that zooms into the function

Suppose we want an interactive plot for the code: ...
1k views

### What's wrong with this FFT-based Von Kármán vortex street simulation?

About 9 years ago, I came across this interesting website, and found the following paragraph with a broken Mathematica code sample: When fluid passes an object, it can leave a trail of vortices ...
120 views

### How to get rid of 0.000 and change 5.*10^n to 3*10^n on Log Plots?

Using Version 13.1.0.0 (Edit: MacOS BigSur Version 11.6, Hardware M1 chip) In order to show some Log (or LogLog) plot features that I find annoying, here is some code: ...
1 vote
28 views

### How to attach Upvalues to CompoundExpression?

I'm trying to make something like this work: Evaluating someData // Query[whatever...] /* summarizeInPrettyWay /* promptToRemoveCompoundExpression ; should produce ...
204 views

### Stability classification code for dynamic system

I'm interested in carrying out stability analysis on discrete dynamic systems, as was done in this paper. The Author used their function ...
158 views

### Adding numbers with defined precision produces incorrect result

I've tracked a bug in my code down to the problem of adding two numbers together, with the left argument having machine precision, e.g by 3` . The issue is, if ...
71 views

### How do we define the function near the end of my post?

Suppose I have two sets $F_{1,n}$ and $F_{2,n}$ written as: ...
38 views

### Problem with ToExpression and TexForm changing two variables multiplied together into one multi-lettered variable

I have a problem where if I multiply two variables a c in Mathematica, then copy as LaTeX (or just use the Mathematica output) to get a c, then put it in ToExpression["a c",TeXForm], I get ...
130 views

### How to compile sum over the compiled expression?

Consider the following toy code: ...
1 vote
103 views

### How do we find the limit of my code?

Suppose we have the following: ...
1 vote
99 views

### How to fix Mathematica crashing in the following case?

I have a problem with Mathematica when trying to glue two tables together. The tables have the form ...
1 vote
97 views

### Outputting probability of rolling 6 dice N times, generating a new output each roll

I am looking to output the probability of n classic six-sided dice but I am not sure how to go about starting. This is what I have written out so far, but no way to go about accounting for n dice for ...
1 vote
51 views

### Possible bug: Wrong differentiation of ParametricFunction inside Parallelize?

In the note RootSearch problem when called from within ParallelDo I described the problem with Ted Ersek's RootSearch package and came to the conclusion that it is ...
1 vote
138 views

### RootSearch problem when called from within ParallelDo

I have been using Ted Ersek's RootSearch package for Wolfram Mathematica for many years. The package worked great, including inside the ...
488 views

### Euler-method implementation

How can I implement this pseudocode in Mathematica? Algorithm: ...
52 views

1 vote
112 views

### How to partition $[a,b]$ into $m$ equal sub-intervals and count the number of sub-intervals that intersect with a subset of $[a,b]$?

Suppose we have a subset of $[a,b]$, where $a=0$ and $b=1$, such as $$A_1=\left\{\frac{1}{2^x}+\frac{1}{2^y}+\frac{1}{2^z}:x,y,z\in\mathbb{Z}\right\}\cap[0,1]$$ Which is a subset of $[0,1]$ If we ...
112 views

### How to partition $[0,1]$ into $m$ equal sub-intervals and count the number of sub-intervals that intersect with my cantor set?

Suppose I define my cantor set as ...
1 vote
74 views

### ParametricPlot on Piecewise function not working with consecutive t values [closed]

I am trying to graph a piecewise function composed of a series of parametric cubic functions. I initially created a ParametricPlot for the first four pieces of the equation and it was working fine, as ...
82 views

### Unable to find the exact dimension of an expression

I have defined a variable called y, this contains a huge equation, but when I look for the dimension of y it shows 3. How come a single expression has dimensions of 3? It is supposed to be 1 right? <...
304 views

### Fourier Transform and Inverse Fourier Transform of Lists

I am trying to compute the Fourier transform of a list, say an array of the form {{t1, y[t1]},.....{tn, y[tn]}}; apply some filters in the spectral components, and then back transform in time domain. ...
51 views

### User Implemented SHA-1 is failing for strings of length >512 bits

So, earlier, I posed a question regarding getting a user implemented SHA-1 hash function to work correctly. Well, I fixed the problems, cleaned it up a little bit, but now I have the problem for when ...
1 vote
240 views

### Q: How to manage notebook crashes, "In a previous session", and memory consumption?

I worked in a notebook. Something went wrong. I do not know what or why. The notebook did not react anymore and closed. After it, I try to open the same notebook. Then the next text appears: "The ...
907 views

### I can't solve system of differential equations with Dsolve

Here is the code and the system, and it is supposedly analytically solvable. $$\frac{dx(t)}{dt} = i(\frac{3w}{2}x + ke^{2iwt}y)$$ $$\frac{dy(t)}{dt} = i(kxe^{-2iwt} +\frac{3w}{2}y)$$ and my code ...
141 views

### Help with debugging my code [closed]

In order to descrive the multifractal behaviour of a set, Baumann provides a code based on the functions Dq and Tau, given below. ...