Questions tagged [iteration]
The iteration tag has no usage guidance.
26
questions with no upvoted or accepted answers
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NestList in 12.1/12.2 is 10x slower than 11.3/12.0
Are there any configurations to fix it?
Test code:
...
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2
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55
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Recursively create Graph from seed and Nest GraphUnion, keeping VertexStyle, EdgeLabels, VertexCoordinates, EdgeShapeFunction
TL;DR;
GraphUnion does not preserve properties of the input Graphs.
How do I combine two ...
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1
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102
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FoldList with Composition and parameter
Good day to everyone!
I have two (just for simple example) functions and they compose a map:
...
- 99
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59
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Find parameter ranges of a function whose value is within a window by sampling points
Problem:
I want to find the ranges of the parameters for a function $f(x,y,z)$ when $0.9 < f(x,y,z) < 1.1$. All parameters are bounded $x , y, z \in [0,1]$. In the real problem the function ...
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84
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Recursion depth of 1024 exceeded during evaluation of ... when importing a directory with many files
I'm doing this:
Import["/Volumes/Transcend2/images/", "*.jpg"];
And getting these errors:
Then, after it's done, when I type "images" and shift+enter, I just ...
- 33
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85
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Implement of Euler Method of Parabolic PDE
I'm experimenting with different schemes for numerically solving PDEs in Mathematica. I use NestList to implement the Euler Method for 1-D PDE, the code is concise:
...
- 524
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43
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Iterating an operator on a polynomial
I want to be able to build an operator $S$, on a polynomial in multiple variables which does something like this
$f[x,y] =$ some polynomial
$S[f][x,y] = y*f[y,x]$
And then for a specific choice of $n$,...
- 101
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23
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Difference between SubstitutionSystem and StringReplace
I'm examining two-step substitution model:
First step, division: {"A" -> "BC", "B" -> "AC", "C" -> "AB"}
Second step, merging: {&...
- 859
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64
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Solving numerically Pdes and Odes and Iteration processes
Dears, I have the following equations: $x^{\prime\prime}(t)=\frac{3}{2}x(t)^{2}$ with $x(0)=4$ and $x(1)=1$. The exact solution is $x(t)=\frac{4}{(1+t)^{2}}$. Now the corresponding operator is
$
Px=x+\...
- 161
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84
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FindRoot doesn't find root
I am facing a problem that my FindRoot doesn't find the actual roots.
I am trying to make a loop that iterates my parameter sets (U0,X0,\Sigma0) to find sets that satisfy some conditions. Here is my ...
- 109
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143
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The use of `NestList `
After read Michael answer, code use NestList to compute and feed in numerical integration. I want to learn this idea into my code.
In the ...
- 453
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81
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Converting 1D map into first order differential equation for bifurcation diagram code
I have existing code to plot bifurcation diagram for coupled first order differential equations. It seems to work for coupled differential equations. To test the code further, I use the simplest ...
- 883
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42
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Flatten a pair of matrices within a list of matrices
I have a list of matrices, which I think is better to give an example using the code.
...
- 107
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154
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Iteration limit exceeded
I am trying to adapt the following piece of code (coming from this answer):
...
- 6,434
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74
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How to use NestWhile to get it to work the way I want?
I have a vector th={0,0,...,1.57}. Now I want to choose the second element and change it by stepsize 0.2 until it is less than 1.57, I need these set of vectors:
th={0,0.2,0,...,1.57}
th={0,0.4,0,...,...
0
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45
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Why Mathematica doesn't compute the permutation products in my NestList[]?
I wrote the following:
K = DihedralGroup[5];
K = GroupGenerators[K];
y = K[[1]];
x = K[[1]];
l = NestList[PermutationProduct[x, y], x, 4]
But Mathematica gives me ...
- 5,111
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51
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Iterating MovingMap with Nest
I am trying to create a background correction inspired by the PyMca strip background method. The data I'm trying to correct is a HPLC chromatogram in the form of a ...
- 395
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76
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How to update a function with previous iterate?
I'm trying to solve a differential equation numerically, and it has led me to a non-linear system of equations which I wish to solve using Newton's Method, which, for systems, is given by (for 3 ...
0
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65
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Avoiding Tables, Do and other loop construction
In my work I have a lot of cases, where I should calculate non-listable functions for a quite large number of points. To be more concrete, consider first listable function ...
- 691
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159
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Nested for loop with variable length
I am new to mathematica and I want to create the set of all n-tuples whose sum is less than a fixed number $N$. My idea would be to do a for loop where I choose first number $k_1$ in between 0 and N, ...
- 101
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119
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FindRoot not recognising replaced symbol in nested function
I have the following example FindRoot function as part of a Nest function.
...
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55
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Iterating over a list and defining the range accordingly
I have the following list,
l = {{"a", "b"}, {"a", "b"}, {"c", "d"}, {"e", "f"}, {"e", "f"},
{"x", "y", "z"}, {"m", "n", "o"}, {"p", "q", "s"}};
for each ...
- 2,766
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94
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How to save a all matrices renewed in each iteration?
I have a (n by m) matrix , in which the elements are recalculated and replaced by new ones in each iteration. (In other words I have a loop in which the elements of the mentioned matrix are being ...
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146
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How can I make my code containing a For loop more Mathematica-style?
I know there are a lot of questions on this site regarding the use of For loops and how to avoid them in Mathematica. However, in my case I believe it is justified,...
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147
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How to give a function multiple variables in a mapped and nested list?
I come from python (not advanced tho), and have been learning mathematica. I'm currently struggling with the following code:
This is a basic version of what i wanted to implement:
...
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136
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Dummy variable in nested integral operator
I am trying to make a nested integral operator where the output function of one step must be applied to the dummy variable to be integrated in the next step. Here my code:
...
- 101