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Questions tagged [singular]

Singularity is a mathematical term indicating an undefined point on a set (function). Singularity arises in many mathematical optimization problems with many variables.

An example of singularity is the derivative of the absolute value function |x| at x = 0.

Singularity arises in many ill-posed problems

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Singular Fit for Random Effect in Binomial GLMM

At my wits end running models and would greatly appreciate help. I am currently running GLMM's to understand the relationships between a set of predictor variables (continuous data) and my binomial outcome variable (0,1 - 'self_reported_conflict).…
candidcorvid
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Fixing computationally singular error in R mlogit package

I am using mlogit package in R for random utility model: https://www.jstatsoft.org/article/view/v095i11#:~:text=mlogit%20is%20a%20package%20for,random%20parameter%20models)%20are%20implemented. The dependent variable "choice" depends on alternative…
Sophie Nguyen
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Singular sdk deep link not working on flutter iOS

I am using singular_flutter_sdk: ^1.0.12 for deep link in my flutter application , in android its working fine but in iOS, when application is already running in background it works but when application is initialised by tapping on the link it only…
Yugal Kalyan
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Singularity in LMM with simple nested random effects

I have a simple experimental design. Each experiment consists of 6 treatments organized in 6 blocks with each treatment replicated once per block. The whole experiment was repeated 6 times. The outcome variable is an insect count for each subject.…
Pharcyde
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About decomposition of singular values and singular systems

Consider the example from the book Robust control and filtering of singular systems (Please see attached image example). I'm trying to reproduce the same example using Matlab. The problem is when I'm using the svd function I got the matrices N and M…
Ali Alaoui
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Singular gradient in nls model - how can I make it work?

I have data, on which I want to fit a non-linear regression model. The model is a physical model to compute the Chlorid defusion coefficient. In my case the model looks like Cx = Ci + (Cs - Ci) * erfc(x / (sqrt(4 * D * t)) with Ci = 0.020664, t =…
stats_123
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how to use lombok singular different

@Data @Builder public class CarViews { @Singular("carViewList") private List carViewList; } private CarViews prepareCarList() { CarResponse carResponse = CarResponse.builder().build(); return…
ali
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How to fix an "structurally singular" - error in a simple loop model (Dymola)?

My Problem is maybe a rather simple one. I want to build up a simple Model of a Flettner Rotor. So it is just a fixed SupportStructure with a Motor/Revolute (fixedBearing) on top, that spins a hollow cylinder around it. At the Bottom there should be…
PaulFrank
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Running a linear mixed model regression when a zero-sum dependent variable causes near-zero variance in random effects

I just want to preface this by saying I'm very new to R, so I'm sorry if this has been answered else-where but I can't seem to see this situation address anywhere else with my limited theory/technical knowledge. Context: my data is from 60…
bedbedbedbedbedbed
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Schema.org standardized class property - What if you need more than one item of the same kind?

Schema.org defines generic types. For example it defines Person here https://schema.org/Person It defines properties like for example alumniOf meaning "what place he/she studied in". Textually "An organization that the person is an alumni of." Okey,…
Xavi Montero
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Singular in MuMIn::dredge

I'm about to run a glm model to test my hypothesis. Once I ran the model I got a singularity warning massage: glmakde_mdDredge <- lmer(log(akdearea) ~ 1 + age_binary + sex + trimester_number + Year + trackNightnum + mean_max_displacement.s +…
Shlomo Cain
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Problem on numerical solution of y'=y^2+1

I would like to use numerical approach to calculate the differential with singularities. For instance, y'=y^2+1 with y(0)=0. The analytical solution is not hard to find, y=tan(x). The problem arises when I apply the numeric method, see the code in…
user142288
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Rails: routing question

I have this in my routes: resources :cvits which produces these routes: cvits GET /cvits(.:format) {:controller=>"cvits", :action=>"index"} POST /cvits(.:format) {:controller=>"cvits", :action=>"create"} …
bdeonovic
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Search for plural words in line and make it singular words

I want to find if the line consists plural words. If so, I want to change those words to singular words. For example: file1.txt That bananas is yellow. They does taste good. Expected_output.txt That banana is yellow. They do taste good. please help…
goodKarma
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Sequelize : Scope with where condition not working with singular and plural

I am looking to put a valid condition in the child running for a 1: 1 and N: N relationship like this example 1:1 // Find all projects with a least one task where task.state === project.state Project.findAll({ include: [{ model: Task, …
Jul
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