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Questions tagged [modeling]

Modeling is the constructing and manipulating abstract (mathematical and/or graphical) representations of economic, engineering, manufacturing, social, and other types of situations and natural phenomenon, simulated with the help of a computer system.

Modeling is the construction and manipulation of abstract (mathematical and/or graphical) representations of economic, engineering, manufacturing, social, and other types of situations and natural phenomenon, simulated with the help of a computer system.

2023 questions
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How to have variables in Rich Text Editor

I have privacy policy document which it is the same across many different websites. I store the document in a Document content type with a Rich Text field called "body". I would like to change the website name and urls programmatically without…
chchrist
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How to model chemical kinetics in python using reaction constants?

I would like to make a concentration vs time graph in Python using data reaction reaction constants already provided to me. Are there any Python packages available? How should I go about solving this?
Ayanna
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Modelisation of a blockchain

I would like to model a blockchain in UML. Here are the requirements that I came up with: User can transfer money Money can be transferred from a bank account to a digital wallet Money can be transferred from a digital wallet to a bank…
user7649902
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Appending values in sub-arrays of an array in python

The goal here is to construct the one-particle distribution function of a system evolving under Brownian dynamics; one has to produce a random number drawn from a Gaussian distribution. To construct this quantity, I am thinking of running several…
Constantine Black
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Certain faces not showing after Model Export to .OBJ from Blender

So here's a pistol that I've been working on for quiet some time now using Blender 2.79b. It is the first model I've ever worked on and it has been shaping up surprisingly well. The problem that has recently popped up though is the fact that when I…
DrSandvich
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Error in as.vector(data) : no method for coercing this S4 class to a vector in R

I am trying to run volatility from GARCH model: Used libraries: source("TimeSeriesFunctions.R") library(PerformanceAnalytics) library(fGarch) library(MonteCarlo) library(Bootstrap) library(xts) library(quantmod) library(dynlm) GARCH1 = garchFit(~…
S_Star
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Modelling practices - Neo4j

I have a graph containing a bunch of nodes of type "Magazine". Each magazine has a few properties and relationships. I want to add data to the graph on to what extent a magazine is read by a perticular target group, ie "Men" or "Women". Obviously…
David W.
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Model 3D spring from points

I have generated points like this and now I what to connect all these points into one model - spring. How can I achieve this? I've tried iterating through each point and build it from polygons or triangles but I have failed. I have set of rings…
Paveli Tripo
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Is it OK to inject service/API client to aggregate root?

I am totally inexperienced in modelling or DDD approach. Below description could point out to my lack of knowledge about how entities, aggregates or microservices work. Background So, I have a domain for invoices, where an Invoice object is an…
K.Baczkiewicz
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Assigning corresponding color values to final model variables to be graphed in ggplot (with geom_col) in R

I’m creating a set of geom_col plots to reveal the model building process where different cognitive task variables are arranged by the order in which they decrease the AIC. Variables are added by the order in which they decrease the AIC, and are…
James
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Neo4J user profile data modeling

I need to design a data model, which stores user profile information. User node may contain name, address, telephone as attributes. Amount of users is expected to be increased dramatically. At the same time, I want to store each users' skills and…
Sajeeva Lakmal
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Train Test Valid data sets... General question about fitting the models

So I was given Xtrain, ytrain, Xtest, ytest, Xvalid, yvalid data for a HW assignment. This assignment is for a Random Forest but I think my question can apply to any/most models. So my understanding is that you use Xtrain and ytrain to fit the…
JoeStat1986
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Comparing R-Squared, AIC and BIC results for multiple models for multiple datasets in R loop

I've got a dataframe with R-squared, AIC and BIC results for multiple models (originally 6 with NAs (failed models) removed ) for multiple datasets (ID 1-285). It looks something like this: R.Squared AIC.Score BIC.Score ID Model 0.995974109…
botinky
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Error where variable has no levels in model

I checked out multiple questions on the topic. They are specific, or not applicable to this case. It feels like there is something obvious I am overlooking. Tried removing the first few columns from dataframe as the error said variable "1". Here is…
Krishna
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Firebase efficiently model nXn relationship

Let's say I have the following scenario: I have multiple events, that multiple users can attend. Also, users can attend multiple events. What's the best way of storing the required information with maintaining data consistency? Here's what I came up…
dmuensterer
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