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.
120 questions
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Broken code from 14.0 to 14.1 [duplicate]
why the behavour of nlmf["ParameterTable"] has been changed from 14.0 to 14.1?
After a run of
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3
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71
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How to only evaluate this function in the new variables after the derivative has been taken?
I have the following situation. I will first post the code and then explain what I'm trying to do and what is going wrong
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56
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Unsuccessful in parallelizing a string decomposition
I am categorizing a very large set of indexed strings that, due to size and complexity, takes long enough to desire to execute this via parallelization.
The below is a simplification, not ...
- 1,886
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2
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141
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How to compute this limit in a shorter time?
Suppose we want to compute the following limit:
\begin{equation}
\lim_{\varepsilon\to 0}\lim_{r\to\infty}\frac{\lfloor 1.0101\left(\lceil 6r^2 \pi/{\varepsilon}\rceil-1\right)+1\rfloor}{ \lceil 6r^2 \...
- 121
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2
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258
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Problem with illustrating pathways
This is slightly different from this and this question. We are focusing on an illustration of all pathways from a specific sample.
Suppose we have the following sample:
$$\small{\mathcal{S}=\left\{(-1....
- 121
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82
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Help defining all pathways of a sample from the same start-point
This is slightly different from this question. We are focusing on finding all pathways of a sample rather than partitions of equal area:
Suppose we have the following sample:
$$\small{\mathcal{S}=\...
- 121
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53
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Why am I getting this error? Set::setraw: Cannot assign to raw object 73
Here is my code. I tried all modifications to this code but I'm not able to resolve the problem. Can anyone tell me why am I getting this error?
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97
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SoftmaxLayer with one-hot vectors
The quantum physics problem I am looking at is a rotated qubit. The setup involves a y-rotated qubit measured in the z-basis (hence spin-up and spin-down). This scenario typically includes modeling ...
- 271
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98
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Most efficient way of defining the following sets for every step $n$
For each $n\in\mathbb{N}$, how do we compute sets $A_n$ and $B_n$ below:
Let $A_1=[0,2/3)$. Let $B_1=(2/3,1]$.
If $A_n$ is a union of intervals, then for each interval cut out the
middle $1/2^{n+1}$ ...
- 121
0
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1
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76
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Generate all commutators and anti-commutators up to a certain order of a list of matrices
I am given a list of matrices. At first order I want to evaluate the commutators and anti-commutators of all pairs in the list and return a new list that contains two lists: one containing all ...
- 115
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37
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Define a function using symbolic constants [closed]
I want to calculate the derivative and find critical points of the following function:
$\begin{equation}
\frac{(w+w_s)(w^2+w_s^2)L^2C^3}{(wR^2C+(w^2 LC-1)^2)(w_s R^2C+(w_s^2 LC-1)^2)} \end{equation}$
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- 111
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1
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93
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Alternative Representation for Energy Levels and Energy Level Density
I need to show the energy level density around the local maximum of this double-well potential. I can do it using the following:
...
- 2,720
8
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1
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283
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Unicode symbols not encoded properly in BarcodeImage[] in Mathematica 13.3
Bug introduced in 13.2 or 13.3 and fixed in 14.1
Trying to generate a simple QR code with ← or U+2190. I got varying results: the same in Mathematica versions 12.3 and 13.1 but very different in ...
- 287
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115
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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 ...
- 9
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1
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200
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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 ...
- 2,720
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1
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207
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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 ...
- 121
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3
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92
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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 ...
- 121
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58
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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 ...
- 2,720
3
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2
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179
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0
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1
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62
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5
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4
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312
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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 ...
- 63
3
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2
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121
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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 ...
- 9,060
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3
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302
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Creating an interactive plot that zooms into the function
Suppose we want an interactive plot for the code:
...
- 121
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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 ...
- 68.4k
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137
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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:
...
- 801
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0
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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
...
- 342
2
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1
answer
316
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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 ...
- 1,078
4
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2
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176
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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 ...
- 587
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0
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74
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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:
...
- 121
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0
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39
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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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153
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1
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1
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117
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1
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127
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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
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- 5,963
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122
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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 ...
- 829
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148
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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 ...
- 829
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2
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571
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0
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55
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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))_{...
- 115
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1
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89
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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 ...
- 309
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0
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92
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Reduce method not working for system of equations
I have the following code which sets up a Reduce function call:
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1
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75
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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 ...
- 121
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1
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56
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2
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1
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127
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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:
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- 143
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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-...
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0
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47
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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 ...
- 587
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0
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44
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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 ...
- 6,409
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0
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86
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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{...
- 11
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1
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104
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Having trouble coding my own QR decomposition using Gram Schmidt [closed]
I have this code for Gram Schmidt:
...
- 31
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2
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282
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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
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1
answer
72
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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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