# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=210

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**Page:** 211

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## [What loss to enforce the \`i.i.d\`ness of a dataset?](https://discourse.julialang.org/t/what-loss-to-enforce-the-i-i-d-ness-of-a-dataset/95731)

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**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 0\
**Last updated:** [March 8, 2023, 12:11pm UTC](https://discourse.julialang.org/t/what-loss-to-enforce-the-i-i-d-ness-of-a-dataset/95731 "2023-03-08T12:11:47Z")

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Hi, I need some help to find a coherent loss to encode the properties i need about my estimator. I want to split a dataset in two, in the Fourrier sense (the infinite divisibility sense). More precisely, consider that …

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## [Is the choice of integrator significant for NeuralODE solving?](https://discourse.julialang.org/t/is-the-choice-of-integrator-significant-for-neuralode-solving/95645)

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**Author:** [@srikumarks](https://discourse.julialang.org/u/srikumarks)\
**Replies:** 1\
**Last updated:** [March 8, 2023, 1:49pm UTC](https://discourse.julialang.org/t/is-the-choice-of-integrator-significant-for-neuralode-solving/95645 "2023-03-08T13:49:43Z")

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For directly solving known ODEs, of course the choice of integrator is significant. However, when learning a network that’s part of an ODE, it isn’t clear to me whether the integrator matters, or should matter. Does it …

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## [In-place functions in definition of ODEProblem (DifferentialEquations)](https://discourse.julialang.org/t/in-place-functions-in-definition-of-odeproblem-differentialequations/30029)

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**Author:** [@zdenek\_hurak](https://discourse.julialang.org/u/zdenek_hurak)\
**Replies:** 9\
**Last updated:** [March 8, 2023, 12:08pm UTC](https://discourse.julialang.org/t/in-place-functions-in-definition-of-odeproblem-differentialequations/30029 "2023-03-08T12:08:21Z")

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I am struggling with something as basic as definition of a function for ODEProblem using DifferentialEquations package: In Example 1 in the documentation for the package, the ODE is defined by a function on the right ha…

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## [Groupedbar plotting not as expected](https://discourse.julialang.org/t/groupedbar-plotting-not-as-expected/95545)

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**Author:** [@dasavy](https://discourse.julialang.org/u/dasavy)\
**Replies:** 4\
**Last updated:** [March 8, 2023, 11:35am UTC](https://discourse.julialang.org/t/groupedbar-plotting-not-as-expected/95545 "2023-03-08T11:35:11Z")

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I have no idea why N=8 is going to the far right and isn’t on the far left. Please let me know if anyone knows what’s happening here

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## [Makie alternating backends per plot](https://discourse.julialang.org/t/makie-alternating-backends-per-plot/95496)

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**Author:** [@filchristou](https://discourse.julialang.org/u/filchristou)\
**Replies:** 4\
**Last updated:** [March 8, 2023, 11:11am UTC](https://discourse.julialang.org/t/makie-alternating-backends-per-plot/95496 "2023-03-08T11:11:36Z")

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Is there a way to specify a makie backend per Figure ? I know about {WGL,Cairo,GL}Makie.activate!() but that’s operating in a global fashion and it’s hard to operate/synchronize (especially for Pluto notebooks). What I…

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## [\[ANN\] DataFitting.jl general purpose data fitting framework](https://discourse.julialang.org/t/ann-datafitting-jl-general-purpose-data-fitting-framework/8433)

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**Author:** [@gcalderone](https://discourse.julialang.org/u/gcalderone)\
**Replies:** 25\
**Last updated:** [March 8, 2023, 10:40am UTC](https://discourse.julialang.org/t/ann-datafitting-jl-general-purpose-data-fitting-framework/8433 "2023-03-08T10:40:07Z")

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Dear community, I’m happy to announce that the first working (and reasonably complete) version of the DataFitting.jl package is available on Github. The main purpose of DataFitting is to provide a general purpose data …

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## [How do I a logistic regression without the intercept in GLM.jl?](https://discourse.julialang.org/t/how-do-i-a-logistic-regression-without-the-intercept-in-glm-jl/95720)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 4\
**Last updated:** [March 8, 2023, 9:36am UTC](https://discourse.julialang.org/t/how-do-i-a-logistic-regression-without-the-intercept-in-glm-jl/95720 "2023-03-08T09:36:27Z")

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I can’t figure out how to fit a model without the intercept The documentatioin just says the intercept is fitted by default but doesn’t show how too do it without the intercept? is that even possible?

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## [Makie plots with equal height + unequal width + data aspect ratio](https://discourse.julialang.org/t/makie-plots-with-equal-height-unequal-width-data-aspect-ratio/60628)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 10\
**Last updated:** [March 8, 2023, 7:42am UTC](https://discourse.julialang.org/t/makie-plots-with-equal-height-unequal-width-data-aspect-ratio/60628 "2023-03-08T07:42:52Z")

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I’d like to have a few plots arranged in a row that have both a data aspect ratio and equal heights, and therefore unequal widths. I can’t seem to get it to work no matter what combination of DataAspect, height, limits, a…

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## [Linear regression without the intercept term](https://discourse.julialang.org/t/linear-regression-without-the-intercept-term/18063)

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**Author:** [@leejm516](https://discourse.julialang.org/u/leejm516)\
**Replies:** 7\
**Last updated:** [March 8, 2023, 9:14am UTC](https://discourse.julialang.org/t/linear-regression-without-the-intercept-term/18063 "2023-03-08T09:14:32Z")

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In GLM.jl, the use of DataFrame is preferred, but the lm function does support the use of vectors and matrices. In the latter case, however, I can’t do fit without the intercept term (i.e. b0 = 0). Is there a way to do t…

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## [Efficient implementation of a convolution within a auto-differentiable objective function](https://discourse.julialang.org/t/efficient-implementation-of-a-convolution-within-a-auto-differentiable-objective-function/95616)

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**Author:** [@mgreifenstein](https://discourse.julialang.org/u/mgreifenstein)\
**Replies:** 9\
**Last updated:** [March 8, 2023, 8:21am UTC](https://discourse.julialang.org/t/efficient-implementation-of-a-convolution-within-a-auto-differentiable-objective-function/95616 "2023-03-08T08:21:21Z")

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Hi all, I have an optimization problem for which I am using JuMP with Ipopt at the moment. The objective function involves 7 convolutions of two vectors. These convolutions are at the moment the bottleneck in performanc…

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## [Replication of \*Universal Differential Equations for Scientific Machine Learning\* for Lotka Volterra](https://discourse.julialang.org/t/replication-of-universal-differential-equations-for-scientific-machine-learning-for-lotka-volterra/95695)

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**Author:** [@Stefano\_Giampiccolo](https://discourse.julialang.org/u/Stefano_Giampiccolo)\
**Replies:** 1\
**Last updated:** [March 8, 2023, 4:16am UTC](https://discourse.julialang.org/t/replication-of-universal-differential-equations-for-scientific-machine-learning-for-lotka-volterra/95695 "2023-03-08T04:16:36Z")

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Hi everyone, I’m trying to replicate the results of Scenario 1 Lotka Volterra from the repository GitHub - ChrisRackauckas/universal\_differential\_equations: Repository for the Universal Differential Equations for Scient…

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## [Possible to save compiled GradientTape after compile in ReverseDiff](https://discourse.julialang.org/t/possible-to-save-compiled-gradienttape-after-compile-in-reversediff/95693)

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**Author:** [@xxxxx](https://discourse.julialang.org/u/xxxxx)\
**Replies:** 8\
**Last updated:** [March 8, 2023, 12:38am UTC](https://discourse.julialang.org/t/possible-to-save-compiled-gradienttape-after-compile-in-reversediff/95693 "2023-03-08T00:38:25Z")

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Hi, I was wondering if it would be possible to save the compiled GradientTape that is used in ReverseDiff.jl. Using the gradient example from the package, I’d like to save compiled\_f\_tape # some objective function t…

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## [How to identify a constraint in JuMp?](https://discourse.julialang.org/t/how-to-identify-a-constraint-in-jump/95434)

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**Author:** [@Optimization](https://discourse.julialang.org/u/Optimization)\
**Replies:** 4\
**Last updated:** [March 7, 2023, 9:14pm UTC](https://discourse.julialang.org/t/how-to-identify-a-constraint-in-jump/95434 "2023-03-07T21:14:02Z")

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Hi, I’m writing all constrained with a given name, as follows: @constraint(m, constraint\[j in 1:20\], sum(A\[j,i\]\*x\[i\] for i in 1:30) \<= b\[j\]) after runing the model, it returns Infeasibility row 'c11': 0 = 1. how ca…

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## [Request for contributions: PDESystemLibrary.jl - A library of systems of symbolic partial differential equations](https://discourse.julialang.org/t/request-for-contributions-pdesystemlibrary-jl-a-library-of-systems-of-symbolic-partial-differential-equations/95639)

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**Author:** [@xtalax](https://discourse.julialang.org/u/xtalax)\
**Replies:** 2\
**Last updated:** [March 7, 2023, 8:42pm UTC](https://discourse.julialang.org/t/request-for-contributions-pdesystemlibrary-jl-a-library-of-systems-of-symbolic-partial-differential-equations/95639 "2023-03-07T20:42:46Z")

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Announcing PDESystemLibrary.jl, a library of symbolically defined PDESystems using ModelingToolkit.jl. We have a few (over 400) systems already included as a start, with more being added all the time. We really want to …

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## [Solver BARON with user-defined function in nonlinear constraint](https://discourse.julialang.org/t/solver-baron-with-user-defined-function-in-nonlinear-constraint/95663)

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**Author:** [@naouess](https://discourse.julialang.org/u/naouess)\
**Replies:** 4\
**Last updated:** [March 7, 2023, 7:17pm UTC](https://discourse.julialang.org/t/solver-baron-with-user-defined-function-in-nonlinear-constraint/95663 "2023-03-07T19:17:18Z")

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Hello dear Julia-community, I am having an issue in using BARON for a nonlinear optimization problem. The problem includes nonlinearities in the constraints with a registered user-defined function. I define the function…

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## [sharedMemory in GPU programming examples](https://discourse.julialang.org/t/sharedmemory-in-gpu-programming-examples/95567)

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**Author:** [@Ahmed\_Salih](https://discourse.julialang.org/u/Ahmed_Salih)\
**Replies:** 3\
**Last updated:** [March 7, 2023, 6:32pm UTC](https://discourse.julialang.org/t/sharedmemory-in-gpu-programming-examples/95567 "2023-03-07T18:32:49Z")

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Hello! I found this great ressource here: https://jenni-westoby.github.io/Julia\_GPU\_examples/dev/Vector\_dot\_product/ And am going through the motion of understanding this. In the mean while I hope some could provide m…

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## [Simultaneous diagonalization of commuting Hermitian matrices](https://discourse.julialang.org/t/simultaneous-diagonalization-of-commuting-hermitian-matrices/95495)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 4\
**Last updated:** [March 7, 2023, 3:50pm UTC](https://discourse.julialang.org/t/simultaneous-diagonalization-of-commuting-hermitian-matrices/95495 "2023-03-07T15:50:25Z")

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I have two Hermitian matrices, one of which is positive definite, and the matrices commute. Is there a standard implementation for the simultaneous diagonalization of such two matrices? To be precise, I have a Hamilton…

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## [\[ForwardDiff\] how to consider expression as constant](https://discourse.julialang.org/t/forwarddiff-how-to-consider-expression-as-constant/95651)

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**Author:** [@mariusd](https://discourse.julialang.org/u/mariusd)\
**Replies:** 5\
**Last updated:** [March 7, 2023, 12:41pm UTC](https://discourse.julialang.org/t/forwarddiff-how-to-consider-expression-as-constant/95651 "2023-03-07T12:41:49Z")

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See the following code. Inside the function f, g(x) is called and I need the result to be used as both a variable and as constant. Now of course I can calculate x20=g(x) outside and provide this as an extra argument to …

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## [Stacked Plots (lines) Help](https://discourse.julialang.org/t/stacked-plots-lines-help/95576)

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**Author:** [@rodolforbcoutinho](https://discourse.julialang.org/u/rodolforbcoutinho)\
**Replies:** 7\
**Last updated:** [March 7, 2023, 12:23pm UTC](https://discourse.julialang.org/t/stacked-plots-lines-help/95576 "2023-03-07T12:23:26Z")

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Hi all! I’m trying to make a stacked plot from the Data Below when I plot using the regular plot function, i got the correct values/positions, but i need then stacked. Using areaplot instead of plot is not working as e…

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## [Controlling gaps between Axis3 areas in Makie](https://discourse.julialang.org/t/controlling-gaps-between-axis3-areas-in-makie/95643)

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**Author:** [@wsshin](https://discourse.julialang.org/u/wsshin)\
**Replies:** 2\
**Last updated:** [March 7, 2023, 6:26am UTC](https://discourse.julialang.org/t/controlling-gaps-between-axis3-areas-in-makie/95643 "2023-03-07T06:26:17Z")

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I am trying to show xy-, xz-, yz-views of a 3D object using Makie. Here is the code to set up three panels for the views: using CairoMakie fig = Figure(resolution=(1500,1500)) fig\[1,1\] = Axis3(fig, aspect=:data, viewm…

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## [JuMP - Nested Optimization with user defined functions](https://discourse.julialang.org/t/jump-nested-optimization-with-user-defined-functions/83199)

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**Author:** [@jmcastro2109](https://discourse.julialang.org/u/jmcastro2109)\
**Replies:** 10\
**Last updated:** [March 6, 2023, 10:02pm UTC](https://discourse.julialang.org/t/jump-nested-optimization-with-user-defined-functions/83199 "2023-03-06T22:02:33Z")

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Hi! I have a Nested Optimization problem that I am trying to solve using JuMP. Inside, I have a linear problem with power constraints where I use JuMP + Mosek to solve. Outside, I have a concave problem defined on a set…

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## [ODE with heterogeneous input through RecursiveArrayTools](https://discourse.julialang.org/t/ode-with-heterogeneous-input-through-recursivearraytools/95625)

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**Author:** [@christianhvejsel](https://discourse.julialang.org/u/christianhvejsel)\
**Replies:** 2\
**Last updated:** [March 6, 2023, 8:26pm UTC](https://discourse.julialang.org/t/ode-with-heterogeneous-input-through-recursivearraytools/95625 "2023-03-06T20:26:46Z")

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Hi all I am trying to solve a first-order ODE with initial conditions input as a heterogeneous array using of RecursiveArrayTools.jl https://docs.sciml.ai/DiffEqDocs/stable/features/diffeq\_arrays/#ArrayPartitions. I ca…

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## [Deploying HTTP.jl tutorial?](https://discourse.julialang.org/t/deploying-http-jl-tutorial/95631)

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**Author:** [@evanfields](https://discourse.julialang.org/u/evanfields)\
**Replies:** 1\
**Last updated:** [March 6, 2023, 8:15pm UTC](https://discourse.julialang.org/t/deploying-http-jl-tutorial/95631 "2023-03-06T20:15:34Z")

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Are there any beginner tutorials for connecting a HTTP.jl server to the public internet? That is, I have wrapped some logic in a tiny HTTP.jl server running on localhost, but I’d like to host it somewhere as a small publ…

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## [Reuse a JuMP model with different solvers](https://discourse.julialang.org/t/reuse-a-jump-model-with-different-solvers/95629)

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**Author:** [@jacob-roth](https://discourse.julialang.org/u/jacob-roth)\
**Replies:** 3\
**Last updated:** [March 6, 2023, 8:09pm UTC](https://discourse.julialang.org/t/reuse-a-jump-model-with-different-solvers/95629 "2023-03-06T20:09:56Z")

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Is there an efficient way to change the solver associated with a JuMP model? For example, I want to solve a model that takes a nontrivial amount of time to setup with a few different solvers. I am wondering if it is poss…

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## [LMM coefficient difference](https://discourse.julialang.org/t/lmm-coefficient-difference/95626)

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**Author:** [@PharmCat](https://discourse.julialang.org/u/PharmCat)\
**Replies:** 0\
**Last updated:** [March 6, 2023, 6:05pm UTC](https://discourse.julialang.org/t/lmm-coefficient-difference/95626 "2023-03-06T18:05:04Z")

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Hello! I try to use MixedModels and GLM for binary data outcome analysis. So I have model: @formula(resp ~ pred1 + pred2) where pred1 and pred2 are continuous predictors. I fit model with Bernoulli() distribution an…

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## [Problem with training a spiking neural network with Flux](https://discourse.julialang.org/t/problem-with-training-a-spiking-neural-network-with-flux/95149)

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**Author:** [@Daniele\_Linaro](https://discourse.julialang.org/u/Daniele_Linaro)\
**Replies:** 7\
**Last updated:** [March 6, 2023, 4:30pm UTC](https://discourse.julialang.org/t/problem-with-training-a-spiking-neural-network-with-flux/95149 "2023-03-06T16:30:53Z")

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Hello, I am trying to use Flux to train a simple spiking neural network to perform input classification. The network has 100 inputs that represent incoming spike streams: half of the inputs are “active” (i.e., they rece…

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## [GRUtils - Surface color and transparency](https://discourse.julialang.org/t/grutils-surface-color-and-transparency/95617)

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**Author:** [@Maucejo](https://discourse.julialang.org/u/Maucejo)\
**Replies:** 0\
**Last updated:** [March 6, 2023, 2:57pm UTC](https://discourse.julialang.org/t/grutils-surface-color-and-transparency/95617 "2023-03-06T14:57:56Z")

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Hi all, I don’t figure out how to set the color of a surface as well as its transparency with GRUtils.jl. Here is a MWE: using GRUtils x = LinRange(0., 100., 100) y = ones(50) vl = LinRange(0., 1., 50) v = repeat(vl'…

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## [Mathematical validity of using SDE solver schemes for custom NoiseProcess(es) in DifferentialEquations.jl](https://discourse.julialang.org/t/mathematical-validity-of-using-sde-solver-schemes-for-custom-noiseprocess-es-in-differentialequations-jl/95025)

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**Author:** [@tom-plaa](https://discourse.julialang.org/u/tom-plaa)\
**Replies:** 4\
**Last updated:** [March 6, 2023, 1:01pm UTC](https://discourse.julialang.org/t/mathematical-validity-of-using-sde-solver-schemes-for-custom-noiseprocess-es-in-differentialequations-jl/95025 "2023-03-06T13:01:51Z")

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As we know, DifferentialEquations.jl has the amazing feature of allowing us to define our own NoiseProcess object and use all the solving interface with it. My question here is more related to the mathematical validity o…

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## [Unit testing of MTK sub-models](https://discourse.julialang.org/t/unit-testing-of-mtk-sub-models/95558)

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**Author:** [@jondavis847](https://discourse.julialang.org/u/jondavis847)\
**Replies:** 3\
**Last updated:** [March 6, 2023, 11:29am UTC](https://discourse.julialang.org/t/unit-testing-of-mtk-sub-models/95558 "2023-03-06T11:29:12Z")

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Hello. I am curious about the expected behavior of MTK when composing large models from sub-models. I’m hoping to better identify and understand which sub-models I’ve designed poorly. Questions : Sometimes when I ma…

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## [Find/Implement Leapfrog method in DifferentialEquations/OrdinaryDiffEq](https://discourse.julialang.org/t/find-implement-leapfrog-method-in-differentialequations-ordinarydiffeq/95595)

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**Author:** [@TheLateKronos](https://discourse.julialang.org/u/TheLateKronos)\
**Replies:** 2\
**Last updated:** [March 6, 2023, 11:23am UTC](https://discourse.julialang.org/t/find-implement-leapfrog-method-in-differentialequations-ordinarydiffeq/95595 "2023-03-06T11:23:59Z")

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I am taking a class on computational physics. Instead of implementing everything myself, I figured I should use (and learn to use) existing frameworks. One of the class problems involves using Leapfrog integration (Wiki…

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