Logistics refers to the overall process of managing how resources are acquired, stored, and transported to their final destination. The "how" often includes an optimization aspect: many "ways" are possible, and we must choose one that is "best" (or, due to limitations, at least "good enough") in some sense.
Questions tagged [logistics]
91 questions
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Knapsack / Bin Packing Problem with a twist?
So, I've been searching far and wide and I'm still not sure what the correct classification of the problem that I'm dealing with is, so I can't really search for solutions to it.
I have x amount of different objects (of which I know their H/W/L) and…
Rissow
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Using an algorithm to determine the ideal size for shipping boxes
I work in a logistic department for a company, recently we have been trying to narrow down the amount of different packaging options that we use.
I have all the necessary product data like length, width, height, volume and also sales data.
So I was…
Rissow
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How do I reload a ResourcePool after the Resource is used up?
Following problem: I have 10.000 RFID Chips in a ResourcePool. When they are used up I need 10 seconds to reload the machine with 10.000 RFID Chips again. Since I'm a beginner my question is: what code do I need to write where in the properties of…
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Trying to Implement Linear Regression with Stochastic Gradient Descent
[Dataset]1I'm attempting to implement linear regression for stochastic gradient descent using python. I have the code to enable me do this but for some reason, its triggering an error at "row[column] = float(row[column].strip())"-could not convert…
DaVince294
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How to find the right size box?
This is a hard question and I hope I can get the answer here.
The question is to find the right size box which allow the logistic business to save the money when shipping.
We have 2 tables which are boxes and products.
Boxes table contains each ID…
Sean
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Vectorize loop dependent on its previous state
We'll take this code:
n = 30;
x = ones(1, n);
for i=1:n
x(i+1)=r*x(i)*(1-x(i));
endfor
The equation is just an example.
Is it possible to vectorize it?
Mattia
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optim is giving errors from par input where fn = dlogis
I don't know if this should be a new item or not.
I modified the code to be:
library(Rcpp)
rm(list = ls())
datafile <- data.frame(
N = c(1.5, 2.6, 0.555555555555556, 0.535714285714286, 0.418604651162791, 0.557377049180328, 0.463157894736842,…
rrh
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Network flow problem with binary in AMPL?
this is an AMPL model, I'm pretty new in this, so I'm doing a classical problem of logistics, a network flow problem, where I have to find the least expensive way to transport available blood donations in a net of cities where there are different…
SilverJack
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JGraphT: How to represent set of Vertices and Edges as efficiently as possible
I am new to Graph theory in addition to this JGraphT (Java) library I'm using in order to implement a solution to a logistics issue I'm trying to solve. As such, I'm a little lost on the best way to tackle this problem I'm having to represent a…
daniel9x
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How to use large data sets with non-linear optimization solvers in python?
I am trying to solve a facility location problem, where I have a set of customers and a set of potential facility locations. Although, the traditional problem is linear, I transformed some constraints and now I have a non-linear problem.
I know…
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2 answers
SQL: Filter self-loops in logistic movements
I'm working on a dataset containing logistic movements of stuff. In visualising the stuff we would like to filter out the movements from e.g. A to A (this madness occurs in the dataset).
Say I have a dataset looking like this: Equipment contains the…
DCB
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Including for loop in subsets
I want to calculate the weekly averages of the the load for two ships with containers. One ship sails at Sunday and the other on Wednesday. I have a big excel file with bookings.I will load up a small part of this file in the following link:…
Bob D.
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How to generate a single AR invoice for a week's delivery
Is it possible to create an Invoice for multiple Sales Orders for a period? I can see only the option to generate Invoice for every single Order.
As of now, every order is processed on receipt and an invoice is generated for each order. A new…
Mubarak Abdullah
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Package optimization with a secuential picking list
I have a picking list(list of items to pick in a warehouse) already ordered following a desired sequence. Every item has a width, length and height. When I report a picking list first of all I have to choose a package in order to put these items…
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plot chaos function using python
I want to plot a diagram for parameter a. For each value of a, I wanna show the trajectory of the map after initial transient, and plot it on the y axis. In the example below I take 200 points in a (parameter that ranges from 1 to 4), run 1000 steps…
StudentOIST
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