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.
108
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Integrate function differing from RUBI's Int function in version 13.3.0
I had Mathematica Version 12.3.1 Student Edition and Integrate and RUBI's Int functions produced the same answers for my purposes with good results. I updated my version to 13.3.0 Student Edition and ...
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2
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1
answer
179
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Python Code to Mathematica for Classical Map of Kicked Top
I am trying to convert this Python code for Classical map of kicked top to Mathematica.
For a single trajectory, I am able to ...
- 9,883
4
votes
1
answer
123
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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:
...
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0
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1
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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 ...
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1
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3
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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 ...
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1
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273
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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 ...
CommunityBot
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52
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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 ...
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3
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2
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166
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1
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60
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5
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1
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133
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4
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4
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272
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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 ...
- 58.4k
3
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2
answers
120
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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 ...
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3
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269
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Creating an interactive plot that zooms into the function
Suppose we want an interactive plot for the code:
...
20
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4
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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 ...
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1
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28
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How to attach Upvalues to CompoundExpression?
I'm trying to make something like this work:
Evaluating
someData // Query[whatever...] /* summarizeInPrettyWay /* promptToRemoveCompoundExpression ;
should produce
...
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2
votes
1
answer
223
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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 ...
- 40.6k
4
votes
2
answers
164
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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 ...
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72
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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:
...
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7
votes
1
answer
425
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What is wrong with this code? (Usage of FunctionInterpolation and how to make code efficient)
I am trying to create an interpolation out of a function that comes from an improper integral. The end goal is to make a 3d plot over a specific region. Specifically, I have the following code:
...
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38
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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 ...
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1
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1
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108
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1
vote
0
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105
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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
...
- 4,652
1
vote
1
answer
106
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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 ...
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0
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51
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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 ...
- 749
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0
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139
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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 ...
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4
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2
answers
517
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0
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52
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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))_{...
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-1
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1
answer
87
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Costly function inside nested Modules [closed]
The function initDataTable simply reset all data to Black first, then set the bottom right quarter to ...
- 33.5k
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90
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Reduce method not working for system of equations
I have the following code which sets up a Reduce function call:
...
0
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1
answer
74
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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 ...
- 152k
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1
answer
56
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2
votes
1
answer
126
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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:
...
- 33.5k
0
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0
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47
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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
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0
answers
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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 ...
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1
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0
answers
43
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Errors in loading IGraphM [closed]
I have been using IGraphM without any problem until today. My Codes using IGraphM started to ...
- 124k
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0
answers
84
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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{...
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-3
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1
answer
88
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Having trouble coding my own QR decomposition using Gram Schmidt [closed]
I have this code for Gram Schmidt:
...
- 107k
1
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2
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239
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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:
...
- 234k
1
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1
answer
71
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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\...
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97
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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:
...
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1
vote
1
answer
91
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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 ...
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1
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1
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116
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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]$$
Which is a subset of $[0,1]$
If we ...
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1
answer
44
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Using coding to calculate my average for functions defined on countable sets?
Suppose we have a function $f:A\to\mathbb{R}$ where $A\subseteq[a,b]$, $a,b\in\mathbb{R}$ and $S\subseteq A$.
Now suppose $f$ is
$$f(x)=\begin{cases}
x^2+1 & x\in S_1\\
x & x\in S_2\\
\end{...
- 23.8k
2
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1
answer
121
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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
...
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1
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1
answer
75
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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 ...
- 107k
0
votes
2
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85
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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?
<...
- 10.1k
1
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1
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251
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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 ...
CommunityBot
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2
answers
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How to set up a simple Monte Carlo simulation?
there is a 1% chance that there will be a scattering event, if there is a scattering event the direction of scattering will be determined by a random sample of the custom[a_] function and if there is ...
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0
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313
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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.
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2
votes
1
answer
51
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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 ...
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