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.
19
questions
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2
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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:
...
- 11
20
votes
4
answers
1k
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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 ...
- 63.4k
10
votes
2
answers
1k
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What is the Difference Between Rule (->) and RuleDelayed (:>)?
I am new to Mathematica so this question may seem rudimentary. Sorry for that! :)
I want to implement the well-known property of Kronecker's Delta
$$\Sigma_{i=1}^{n} a_i \delta_{ij}=a_j,\quad 1 \le ...
- 1,707
10
votes
2
answers
5k
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How to set up a simple Monte Carlo simulation?
there is a 1% chance that there will be a scattering event, if there is a scattering event the direction of scattering will be determined by a random sample of the custom[a_] function and if there is ...
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7
votes
1
answer
425
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What is wrong with this code? (Usage of FunctionInterpolation and how to make code efficient)
I am trying to create an interpolation out of a function that comes from an improper integral. The end goal is to make a 3d plot over a specific region. Specifically, I have the following code:
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- 561
3
votes
2
answers
744
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EdgeRenderingFunction question
Bug introduced in 9.0 and fixed in 10.0.0
(Edit 1 : I added this paragraph after the original post, for context)
Some context for this question can be found in another post (https://mathematica....
- 475
1
vote
2
answers
824
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Michaelis–Menten kinetics using Gillespie Algorithm
I am trying to implement Michaelis–Menten kinetics using Gillespie Algorithm.
$$\text{Reaction 1:}\quad E+S\rightarrow C$$
$$\text{Reaction 2:}\quad C\rightarrow E+S$$
$$\text{Reaction 1:}\quad C\...
- 10.5k
0
votes
1
answer
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 ...
- 4,642
4
votes
1
answer
894
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Issue in ParallelTable after evaluating another function using NDSolve and FindRoot. What is wrong with this inverse?
I am trying to find the inverse of a function which is defined through NDSolve and NIntegrate.
The question is pretty similar ...
- 1,201
4
votes
1
answer
366
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Why Min cannot be used as constrains of NMinimize?
I met a strange problem when trying to do an optimization.
Initialization code,
...
- 1,429
2
votes
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
...
- 39
2
votes
5
answers
2k
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Where did I go wrong with my implementation of finding a plane tangent to a surface?
I am working on finding the plane tangent to a paraboloid at a given point.
My code:
...
- 595
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 ...
- 445
1
vote
0
answers
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 ...
- 749
1
vote
0
answers
104
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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
...
- 4,642
1
vote
1
answer
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 ...
- 39
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 ...
- 13
0
votes
1
answer
192
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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 ...
- 39
0
votes
1
answer
97
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Do-loop with ParametricNDSolveValue not giving expected results
I have written code that using a Do-loop. In the loop I am changing the value of x, v, l and R, and looking at the computed ...
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