A random walk is a mathematical formalization of a path that consists in a succession of random steps. A random walk can be a Markov chain or process; it can be on a graph or a group. Random walks can model randomized processes, in fields such as: ecology, economics, psychology, computer science, physics, chemistry, and biology.
Questions tagged [random-walk]
248 questions
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Simulating for loop
I am trying to simulate the following random walk equation:
However, when I run my code I can't append the results. I get the following error:
first_term = results[i] TypeError: 'NoneType' object is not
subscriptable
Is there an alternative…
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Brownian motion on a Matplotlib canvas
I am trying to draw a Brownian motion on top of the following canvas:
import matplotlib
import matplotlib.pyplot as plt
palette = matplotlib.colors.ListedColormap(['#F08080'])
gridCells = np.ones((50, 50)) * np.nan
gridCells.shape
N=50
for j in…
COxf
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R Limit matrix in random walk
I have the following code for a random walk, in which I start from i and add up cumulatively for each line.
However, I need to limit my random walk on each line. One way I thought of doing this, would be from the index j (where the value in the…
Danilo Perl
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For loop of random walk in Python
I am currently learning the random walk on Python, I came across the sample code that I couldn't explain please help me to clarify this
My question is that why does x no need to be put in the loop but the code is still able to operate. The other…
James Huang
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Random walk with stop condition
I have the following generator code for a random walk:
i = 1
t = 100
p = 0.5
max_walk = 1000
samples = rbinom(max_walk, 1, p)
samples[samples==0] = -1
walk = c(i, cumsum(samples))
In my case i is the value of the first step, and t would be the…
Danilo Perl
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Algorithm for 1D Random Walk with Varying Step Sizes?
I am trying to figure out all the possible random walks for a given distance and displacement, and it has a fairly complicated set of conditions.
The step sizes can vary, eg. the walk is not just a combination of +1s and -1s, but will include…
Mason Camera
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Can you construct a deterministic infinite RNG with just a few known parameters?
I'm currently using a cone-based random walk with reflections at the boundaries (denoted R[n]), with the following properties:
R[n] is always in a user defined range (called the boundaries) [a, b] (or [-a, a] if that's easier)
R[0] is defined by…
ijustlovemath
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Does this simulate 1D random walk?
Just started with python, so bear with me for some silly questions. Trying to figure out if the below code actually simulates a 1D random walk motion. The +/- 1 of respective random steps do not seem to add up in results.
Results:
positions: [0, 1,…
montypython
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Python: Plot frequency of negative (x,y) coordinates
I'm trying to plot the frequencies of a 2D-integer random walk starting from (0,0). First, I get a list of (x,y)-coordinates, some of which are negative and I'm having problems plotting them the right way. I know my current attempt is wrong, as…
ProbM
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Random walk simulation based on the flipping of a biased coin 100 times
I'm starting in Python. I'm trying to make a simulation of a random walk in a straight line (north and south) based on flipping a biased coin 100 times with 0.3 chance of getting tails and 0.7 chance of getting heads assuming that the values from…
Alannah
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Neutrons through a reactor shield
I have been staring at my screen now since last Thursday. I am very new to coding and am not at all sure how to go about this problem. Please any help would be greatly appreciated.
A beam of neutrons bombards a reactor's wall. Consider the motion of…
sek1996
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How do i animate using matplotlib?
I try to animate my random walk code. I have two lists that i want to animate, peopleX and peopleY.
peopleX = [[-9, 9, -18], [-10, 9, -18], [-10, 9, -18], [-10, 10, -18], [-9, 10, -17], [-10, 10, -18]]
peopleY = [[-14, 16, 3], [-15, 15, 3], [-16,…
Tiffany Arasya
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Question regarding the implementation of the paper " guided random walks" weighing functions
I'm working on the implementation of the paper: Segmentation by retrieval with guided random walks: Application to left ventricle segmentation in MRI.
I tried to modify the weights functions mentioned in Scikit-Image random walker algorithm to…
Bilal
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Random walker algorithm how a gray-level image can be 3D?
I was reading the source of the random walker algorithm in scikit-image library, and it's written there that:
Parameters
data : array_like
Image to be segmented in phases. Gray-level `data` can be two- or
three-dimensional
My question…
Bilal
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2 answers
In python random walker ,how can I set a random starting point instead of setting origin?
I'm trying to implement a random walker in python.But I want to set a random starting point instead of initialize the first position.how can i set a random starting point?
user9338977