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.
106
questions
0
votes
1
answer
189
views
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 ...
- 29
1
vote
3
answers
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 ...
- 29
0
votes
0
answers
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 ...
- 1,492
3
votes
2
answers
164
views
0
votes
1
answer
60
views
0
votes
1
answer
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 ...
- 4,982
4
votes
4
answers
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 ...
- 53
3
votes
2
answers
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 ...
- 8,860
1
vote
3
answers
259
views
Creating an interactive plot that zooms into the function
Suppose we want an interactive plot for the code:
...
- 29
20
votes
4
answers
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 ...
- 62.8k
4
votes
1
answer
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:
...
- 655
1
vote
0
answers
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
...
- 322
2
votes
1
answer
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 ...
- 419
4
votes
2
answers
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 ...
- 557
0
votes
0
answers
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:
...
- 29
0
votes
0
answers
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 ...
- 1
5
votes
1
answer
130
views
1
vote
1
answer
103
views
1
vote
0
answers
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
...
- 4,982
1
vote
1
answer
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
0
answers
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 ...
- 727
1
vote
0
answers
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 ...
- 727
4
votes
2
answers
488
views
0
votes
0
answers
52
views
If definition of elements in table
I need to define a table where the definition of the elements differs if the indices $i$ and $j$ are equal or different. In particular I have to implement the following formula $$(K_1^{(1)}(m_1,m_2))_{...
- 115
-1
votes
1
answer
87
views
Costly function inside nested Modules [closed]
The function initDataTable simply reset all data to Black first, then set the bottom right quarter to ...
- 149
0
votes
0
answers
89
views
Reduce method not working for system of equations
I have the following code which sets up a Reduce function call:
...
0
votes
1
answer
74
views
Deleting all elements in a list where the output of elements from a function is zero
I tried using DeleteCases to delete elements in r1 where g2==0 to get a defined arithmetic ...
- 29
0
votes
1
answer
56
views
2
votes
1
answer
124
views
Python to Mathematica code bug
I have an assignment in Mathematica, which I've already solved using Python and it's a bit hard to convert the code. Here's what I have done so far:
...
- 133
0
votes
0
answers
45
views
How to create 2-D or 3-D curves to simulate something like the SIR model
I don’t know what is wrong with my code. I am trying to create 2-D or 3-D curves to simulate something like the SIR model, but with tumor growth instead.
It is a proliferation-invasion/ reaction-...
2
votes
0
answers
46
views
ParallelTry Hangs on previously working code
When I run the below ParallelTry command, it just sits on it and says its being evaluated, but I cant abort it, it doesn't return what I am expecting, and I have to ...
- 557
1
vote
0
answers
43
views
Errors in loading IGraphM [closed]
I have been using IGraphM without any problem until today. My Codes using IGraphM started to ...
- 5,283
1
vote
0
answers
84
views
What is wrong with my code for implementing PSOR (Projected Successive Over Relaxation)? [closed]
I have written the numerical scheme of PSOR (Projected Successive Over Relaxation) method of a obstacle program in 1D, which is as follows:
\begin{align*}
&u_0=u_N=0\\
&u_i^{k+\frac{...
- 11
-3
votes
1
answer
85
views
Having trouble coding my own QR decomposition using Gram Schmidt [closed]
I have this code for Gram Schmidt:
...
- 31
1
vote
2
answers
214
views
QR decomposition using Gram Schmidt [closed]
First of all I don't want to use the reflection method, only Gram-Schmidt.
So here's the program for Gram-Schmidt:
...
- 11
1
vote
1
answer
71
views
Help Calculating My "Deviation"
I created a "distribution deviation" where for $\left\{a_1,...,a_k\right\}$ we take all take the mean of all combinations of $\frac{\min\left\{a_{i},a_{j}\right\}}{\max\left\{a_{i},a_j\right\...
- 29
0
votes
0
answers
95
views
Error in Monte Carlo simulation. Now Random walk (dotted curve) doesn't fit to the analytical curve (dashed curve)
I've been trying to code a kinetic monte carlo simulation for a system of consecutive chemical reactions using a fixed (repaired) code that the user flinty gives me in the last questions I post:
...
- 13
1
vote
1
answer
88
views
Strange error not found in a monte carlo code, Infinite expression 1/0 encountered
I've been trying to code a kinetic monte carlo simulation for a dimerization reaction, 2M ---> D. However I have a kinetic Monte Carlo code for a first order decomposition reaction of AIBN (that's ...
- 13
-1
votes
1
answer
43
views
Using coding to calculate my average for functions defined on countable sets?
Suppose we have a function $f:A\to\mathbb{R}$ where $A\subseteq[a,b]$, $a,b\in\mathbb{R}$ and $S\subseteq A$.
Now suppose $f$ is
$$f(x)=\begin{cases}
x^2+1 & x\in S_1\\
x & x\in S_2\\
\end{...
- 29
1
vote
1
answer
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 ...
- 29
2
votes
1
answer
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
...
- 29
1
vote
1
answer
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 ...
- 33
0
votes
2
answers
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?
<...
- 1,699
0
votes
0
answers
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.
...
- 153
2
votes
1
answer
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 ...
- 445
1
vote
1
answer
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 ...
- 2,585
0
votes
1
answer
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 ...
- 101
0
votes
1
answer
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.
...
- 95
-2
votes
1
answer
372
views
1
vote
2
answers
130
views
I have two lists that are the same, yet I get a FALSE when i try to show they are equivalent
I have tried changing the variables, reevaluating the cells, but it just keeps giving me false. The weird part is that it was originally true and it changed to false, randomly.I did not want to post ...
