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## Network Trip Assignment with igraph

My problem: I have a street network (df.net) and a list containing the Origins and Destinations of trips (df.trips). I need to find the flow on all links? library(dplyr) df.net = tribble(~from, ~to, ~weight,1,2,1,2,1,1,1,9,3,9,1,2,2,10,1,10,2,2,9,10,8,10,9,15,9,8,1,8,9,2,7,8,2,12,7,3,9,12,10,12,9,9,12,6,2,6,12,5,11,12,3,12,11,3,5,6,1,11,5,4,5,11,3,11,4,3,4,3,5,3,10,4,10,11,10) df.trips = tribble(~from, ~to, ~N,1,2,45,1,4,24,1,5,66,1,9,12,1,11,54,2,3,63,2,4,22,2,7,88,2,12,44,3,2,6,3,8,43,3,10,20,3,11,4,4,1,9,4,5,7,4,6,35,4,9,1,5,7,55,5,8,21,5,1,23,5,7,12,5,2,18,6,2,31,6,3,6,6,5,15,6,8,19,7,1,78,7,2,48,7,3,92,7,6,6,8,2,77,8,4,5,8,5,35,8,6,63,8,7,22) This is my solution: library(igraph) # I construct a directed igraph network: graph = igraph::graph_from_data_frame(d=df.net, directed=T) […]

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## How to access coordinates inside a list in python?

I have a list containing coordinates of a polygon inside a list .How do i access x and y points present in this list .Basically i have to use these points and plot.I have to extract all_points_x and all_points_y enter code here [{‘shape_attributes’: {‘name’: ‘polygon’, ‘all_points_x’: [35, 28, 27, 31, 40, 51, 62, 72, 74, […]

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## $f(n)$ is equal to the number of perfect squares in the range $[n^2,2n^2]$

Let $f:\mathbb{Z}_+^*\to \mathbb{Z}_+^*$ such that $f(n)$ is equal to the number of perfect squares in the range $[n^2,2n^2]$. Prove that $f$ is increasing and surjective. $f(n)\ge 1$ because $n^2$ is always in range. I did a few terms: $n=1 \to \{1^2\} \in [1,2]\implies f(1)=1$ $n=2 \to \{2^2\} \in [4,8]\implies f(2)=1$ \$n=3 \to \{3^2,4^2\} \in [9,18]\implies […]

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## “Could not receive Stock Item data” Line Appear Instead of Admin Product Grid – Magento 2

“Could not receive Stock Item data” line appear instead of product grid in admin side. I have recently imported other db to my Cloud local setup. When I am doing indexing,I am getting error like this. SQLSTATE[HY000]: General error: 1449 The user specified as a definer (”@’%’) do es not exist, query was: DELETE price_index […]

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## Inserting elements into an array

I have an multidimensional array in Excel: In the VBA script I have the following code: Dim actualWeights actualWeights = Range(“A7:E21”).Value After some calculations, I want to add the missing ID’s in place in the array. So in this case ID 3, 4, 6 etc. To my regret there is no append or insert function […]

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## Python Letter Grades from Percent Score

I am trying to return the letter grade for a list of test scores. It keeps saying ‘>=’ not supported between instances of ‘list’ and ‘int’ Here is the code: g = [87, 92, 100, 54, 72, 84, 81, 74] def grade(g): if ([g]>=90): return “A” elif (80<=[g]<90): return “B” elif (70<=[g]<80): return “C” elif […]