# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=206

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**Page:** 207

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## [The solution of JuMP model cannot splice horizontally](https://discourse.julialang.org/t/the-solution-of-jump-model-cannot-splice-horizontally/96511)

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**Author:** [@kevinqiao](https://discourse.julialang.org/u/kevinqiao)\
**Replies:** 1\
**Last updated:** [March 23, 2023, 7:07pm UTC](https://discourse.julialang.org/t/the-solution-of-jump-model-cannot-splice-horizontally/96511 "2023-03-23T19:07:07Z")

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I encountered an interesting question, I defined a sub-function (it’s a model) with a variable vector of 9×1 dimension, and the variables are as follows @variable(model, varFlow\[1:9\], Bin) The problem can be solved, an…

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## [Unable to use set\_attribute](https://discourse.julialang.org/t/unable-to-use-set-attribute/96529)

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**Author:** [@lilychow233](https://discourse.julialang.org/u/lilychow233)\
**Replies:** 1\
**Last updated:** [March 23, 2023, 7:06pm UTC](https://discourse.julialang.org/t/unable-to-use-set-attribute/96529 "2023-03-23T19:06:02Z")

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Hi. My julia version is 1.8.5. I tried to run the Benders Decomposition example from However, issues occured with the Callback Method. Specifically with this line: set\_attribute(lazy\_model, MOI.LazyConstraintCallbac…

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## [CUDA Format of \_\_nvvm\_\_reflect function not recognized](https://discourse.julialang.org/t/cuda-format-of-nvvm-reflect-function-not-recognized/96370)

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**Author:** [@Mark\_Lau](https://discourse.julialang.org/u/Mark_Lau)\
**Replies:** 12\
**Last updated:** [March 23, 2023, 4:19pm UTC](https://discourse.julialang.org/t/cuda-format-of-nvvm-reflect-function-not-recognized/96370 "2023-03-23T16:19:27Z")

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I have some code that is similar to an example from the CUDA.jl Introduction. Specifically, this one: using CUDA N = 2^20 x\_d = CUDA.fill(1.0f0, N) # a vector stored on the GPU filled with 1.0 (Float32) y\_d = CUDA.fi…

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## [Search in CUDA vector](https://discourse.julialang.org/t/search-in-cuda-vector/94833)

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**Author:** [@MohHizzani](https://discourse.julialang.org/u/MohHizzani)\
**Replies:** 5\
**Last updated:** [March 23, 2023, 12:35pm UTC](https://discourse.julialang.org/t/search-in-cuda-vector/94833 "2023-03-23T12:35:46Z")

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I have a vector of binary values, need to find all indices that are one, and randomly select one to update another vector at the same index selected.

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## [MTK & Linearization](https://discourse.julialang.org/t/mtk-linearization/95803)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 26\
**Last updated:** [March 23, 2023, 11:29am UTC](https://discourse.julialang.org/t/mtk-linearization/95803 "2023-03-23T11:29:34Z")

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MTK documentation case I’m looking at the linearization example in the MTK documentation: using ModelingToolkit @variables t x(t)=0 y(t)=0 u(t)=0 r(t)=0 @parameters kp = 1 D = Differential(t) eqs = \[u ~ kp \* (r - y) # …

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## [MTK and Jacobian](https://discourse.julialang.org/t/mtk-and-jacobian/96075)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 5\
**Last updated:** [March 23, 2023, 11:22am UTC](https://discourse.julialang.org/t/mtk-and-jacobian/96075 "2023-03-23T11:22:14Z")

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I have an unbalanced/partial model consisting of 2 differential equations, 11 algebraic equations, and 17 unknowns/states. I want to compute the Jacobian of the model. I have 3 questions regarding the calculate\_jacobian …

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## [Extracting data vectors in constraint from sum notation in JuMP](https://discourse.julialang.org/t/extracting-data-vectors-in-constraint-from-sum-notation-in-jump/96448)

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**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 4\
**Last updated:** [March 22, 2023, 10:25pm UTC](https://discourse.julialang.org/t/extracting-data-vectors-in-constraint-from-sum-notation-in-jump/96448 "2023-03-22T22:25:27Z")

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Dear All, I am working on an optimization problem where I have a variable y\_{i,j} where i,j \\in \[1:n\] = \\{1,2,\\ldots,n\\}. I have a constraint of the form \\sum\_{j \\in \[1:n\]} y\_{j,i} - \\sum\_{j \\in \[1:n\]} y\_{i,j} \\geq b\_…

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## [DynamicalSystems: dynamic rule evaluates to nonzero but trajectory stays at initial condition](https://discourse.julialang.org/t/dynamicalsystems-dynamic-rule-evaluates-to-nonzero-but-trajectory-stays-at-initial-condition/96481)

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**Author:** [@cjoshliu](https://discourse.julialang.org/u/cjoshliu)\
**Replies:** 3\
**Last updated:** [March 22, 2023, 10:25pm UTC](https://discourse.julialang.org/t/dynamicalsystems-dynamic-rule-evaluates-to-nonzero-but-trajectory-stays-at-initial-condition/96481 "2023-03-22T22:25:02Z")

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Hi, I’m new to Julia and trying to find fixed points of an s-species generalized Lotka-Volterra model using DynamicalSystems. My model is d\_t\\vec{u}=\\vec{\\lambda}+\\vec{r}\\cdot\\vec{u}\\cdot (1-\\hat{\\alpha}\\vec{u}) where \\…

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## [ITERATION\_LIMIT with small changes in constraints](https://discourse.julialang.org/t/iteration-limit-with-small-changes-in-constraints/96403)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 3\
**Last updated:** [March 22, 2023, 7:07pm UTC](https://discourse.julialang.org/t/iteration-limit-with-small-changes-in-constraints/96403 "2023-03-22T19:07:40Z")

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I have a linear problem with linear equality and inequality constraints (and interval constraints). It works perfectly with various lower and upper bounds, but specific values trigger this ITERATION\_LIMIT and there is no…

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## [How can I perform GLM regression on column names with spaces?](https://discourse.julialang.org/t/how-can-i-perform-glm-regression-on-column-names-with-spaces/96442)

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**Author:** [@bertulli](https://discourse.julialang.org/u/bertulli)\
**Replies:** 6\
**Last updated:** [March 22, 2023, 5:06pm UTC](https://discourse.julialang.org/t/how-can-i-perform-glm-regression-on-column-names-with-spaces/96442 "2023-03-22T17:06:37Z")

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Hi all, very noob question but I can’t find an answer. I’m trying to do a linear regression on some data I have: julia\> df\_under\_test\[:, \[instruction\_sym, measure\_power\_sym, binary\_weight\_sym\]\] 1165×3 DataFrame Row │…

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## [How to solve Path Integral Problems with Probabilistic Programming Techniques?](https://discourse.julialang.org/t/how-to-solve-path-integral-problems-with-probabilistic-programming-techniques/96430)

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**Author:** [@GDufenshuoo](https://discourse.julialang.org/u/GDufenshuoo)\
**Replies:** 8\
**Last updated:** [March 22, 2023, 2:45pm UTC](https://discourse.julialang.org/t/how-to-solve-path-integral-problems-with-probabilistic-programming-techniques/96430 "2023-03-22T14:45:34Z")

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Hello everyone, I’m not very familiar with probabilistic programming, so I may not be approaching this problem in the most optimal way. Essentially, I’m trying to solve a problem of the following form: Z \\sim \\int\\int..…

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## [TimeSeries.jl and upsampling](https://discourse.julialang.org/t/timeseries-jl-and-upsampling/88896)

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**Author:** [@olivier](https://discourse.julialang.org/u/olivier)\
**Replies:** 3\
**Last updated:** [March 22, 2023, 3:14pm UTC](https://discourse.julialang.org/t/timeseries-jl-and-upsampling/88896 "2023-03-22T15:14:35Z")

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Hi, I need to be able to resample time series both ways : downsampling and upsimpling. I was able to downsample my time series using both TimeSeries.jl and TimeSeriesResampler.jl But the later doesn’t support upsampli…

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## [Score function error for simple custom Gaussian node in RxInfer](https://discourse.julialang.org/t/score-function-error-for-simple-custom-gaussian-node-in-rxinfer/96368)

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**Author:** [@John\_Boik](https://discourse.julialang.org/u/John_Boik)\
**Replies:** 1\
**Last updated:** [March 22, 2023, 12:46pm UTC](https://discourse.julialang.org/t/score-function-error-for-simple-custom-gaussian-node-in-rxinfer/96368 "2023-03-22T12:46:05Z")

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I’m testing a simple Gaussian custom node in RxInfer just to make sure I have the syntax correct, but I’m having trouble with the score function for Bethe free energy. My inference() function runs fine and returns BFE if…

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## [How to solve a Markov decision process with randomness](https://discourse.julialang.org/t/how-to-solve-a-markov-decision-process-with-randomness/96426)

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**Author:** [@Jian\_ZUO](https://discourse.julialang.org/u/Jian_ZUO)\
**Replies:** 0\
**Last updated:** [March 22, 2023, 12:24am UTC](https://discourse.julialang.org/t/how-to-solve-a-markov-decision-process-with-randomness/96426 "2023-03-22T00:24:21Z")

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Hi, I have a Markov decision process as follows: states: S1, S2; the increment of S1 follows a Gamma law, i.e. S1(t+d)-S1(t) ~ gamma(alpha, beta), S1 has a fixed range of zero to a failure threshold FT (thus the transi…

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## [Minibatching neural ODEs with different initial conditions](https://discourse.julialang.org/t/minibatching-neural-odes-with-different-initial-conditions/96361)

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**Author:** [@kaido975](https://discourse.julialang.org/u/kaido975)\
**Replies:** 7\
**Last updated:** [March 21, 2023, 8:18pm UTC](https://discourse.julialang.org/t/minibatching-neural-odes-with-different-initial-conditions/96361 "2023-03-21T20:18:39Z")

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I am trying to train a neural ODE on different time trajectories, starting with different initial conditions. I am able to observe a reduction in loss with ADAM (with good outputs), but BFGS does not work at all. Why is …

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## [Surprisingly inaccurate sparse Cholesky factorization](https://discourse.julialang.org/t/surprisingly-inaccurate-sparse-cholesky-factorization/96410)

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**Author:** [@jarapo](https://discourse.julialang.org/u/jarapo)\
**Replies:** 2\
**Last updated:** [March 21, 2023, 6:01pm UTC](https://discourse.julialang.org/t/surprisingly-inaccurate-sparse-cholesky-factorization/96410 "2023-03-21T18:01:41Z")

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I am surprised by how inaccurate cholesky() can be for sparse matrices; so much so it me wonder if I am not using it correctly. Define a finite different matrix A: L=2; dvec=-2\*ones(2^L);restvec=ones(2^L-1); A =sparse(…

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## [DiffEqJump/Catalyst, Turing possible?](https://discourse.julialang.org/t/diffeqjump-catalyst-turing-possible/83479)

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**Author:** [@jae0](https://discourse.julialang.org/u/jae0)\
**Replies:** 4\
**Last updated:** [March 21, 2023, 5:52pm UTC](https://discourse.julialang.org/t/diffeqjump-catalyst-turing-possible/83479 "2023-03-21T17:52:09Z")

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Hi, I am wondering if it is possible to do parameter inference using Turing for a DiffEqJump model? I understand that this type of problem might be better handled using an optimizer, but I am curious if it can be done …

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## [How to use hovertemplate with Plotly Python via Pycall](https://discourse.julialang.org/t/how-to-use-hovertemplate-with-plotly-python-via-pycall/96337)

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**Author:** [@this\_josh](https://discourse.julialang.org/u/this_josh)\
**Replies:** 6\
**Last updated:** [March 21, 2023, 4:54pm UTC](https://discourse.julialang.org/t/how-to-use-hovertemplate-with-plotly-python-via-pycall/96337 "2023-03-21T16:54:18Z")

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I’d like to create this plotly example in Julia by using PyCall to access python plotly. Below is the code from the example converted to julia: using PyCall go = pyimport("plotly.graph\_objects") subplots = pyimport("plo…

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## [Error with a new syntax of Flux](https://discourse.julialang.org/t/error-with-a-new-syntax-of-flux/96331)

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**Author:** [@iHany](https://discourse.julialang.org/u/iHany)\
**Replies:** 2\
**Last updated:** [March 21, 2023, 12:28am UTC](https://discourse.julialang.org/t/error-with-a-new-syntax-of-flux/96331 "2023-03-21T00:28:57Z")

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Hi, I’m trying to make my neural network compatible with a new syntax of Flux. Note that the network I used, PLSE, receives two arguments as PLSE(x, u). Code using Test using ParametrisedConvexApproximators using Lin…

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## [How can I combine different density plots in a 3D plot?](https://discourse.julialang.org/t/how-can-i-combine-different-density-plots-in-a-3d-plot/96194)

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**Author:** [@bertulli](https://discourse.julialang.org/u/bertulli)\
**Replies:** 8\
**Last updated:** [March 20, 2023, 10:36pm UTC](https://discourse.julialang.org/t/how-can-i-combine-different-density-plots-in-a-3d-plot/96194 "2023-03-20T22:36:15Z")

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Hi all! I’m analyzing some data that follows a more-or-less-linear dependency. Here’s a picture: I’d like to show the dispersion around the mean for each of the vertical bins you see. What I need is (I think) the den…

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## [Extract binary file from HTTP request body](https://discourse.julialang.org/t/extract-binary-file-from-http-request-body/96322)

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**Author:** [@sschmidhuber](https://discourse.julialang.org/u/sschmidhuber)\
**Replies:** 2\
**Last updated:** [March 20, 2023, 10:14pm UTC](https://discourse.julialang.org/t/extract-binary-file-from-http-request-body/96322 "2023-03-20T22:14:20Z")

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Hello, I’m struggling currently with extracting a binary file from a POST request body. On the client side I submit a form with a binary file and the enctype=“multipart/form-data”, that seems to work well. On the serv…

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## [Training is 500x slower than inference for a custom loss function](https://discourse.julialang.org/t/training-is-500x-slower-than-inference-for-a-custom-loss-function/96283)

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**Author:** [@neuromancer](https://discourse.julialang.org/u/neuromancer)\
**Replies:** 5\
**Last updated:** [March 20, 2023, 9:41pm UTC](https://discourse.julialang.org/t/training-is-500x-slower-than-inference-for-a-custom-loss-function/96283 "2023-03-20T21:41:10Z")

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I am trying to use gradient descent to optimize a matrix (a single layer neural network) using a custom loss function. The loss function is a sum of a Gaussian-kernel-embedded maximum mean discrepancy plus the L1 norm of…

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## [Flux: trainmode!() and testmode!() needed?](https://discourse.julialang.org/t/flux-trainmode-and-testmode-needed/94155)

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**Author:** [@wsshin](https://discourse.julialang.org/u/wsshin)\
**Replies:** 3\
**Last updated:** [March 20, 2023, 9:16pm UTC](https://discourse.julialang.org/t/flux-trainmode-and-testmode-needed/94155 "2023-03-20T21:16:52Z")

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I started using Flux recently, and I am wondering when Flux.trainmode!() and Flux.testmode!() need to be called. Am I correct that these functions do not need to be called explicitly during normal training and testing, …

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## [LoadError: Could not find any suitable device for this configuration](https://discourse.julialang.org/t/loaderror-could-not-find-any-suitable-device-for-this-configuration/96253)

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**Author:** [@stmorg](https://discourse.julialang.org/u/stmorg)\
**Replies:** 2\
**Last updated:** [March 20, 2023, 4:58pm UTC](https://discourse.julialang.org/t/loaderror-could-not-find-any-suitable-device-for-this-configuration/96253 "2023-03-20T16:58:02Z")

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Hello, Currently setting up julia on my new machine and having some trouble with getting CUDA to work. I am getting errors during test. Below is the output with JULIA\_DEBUG=all Pkg.test("CUDA") ┌ Debug: Loading cache f…

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## [Is it possible to store the JuMP output to an \*.xlsx?](https://discourse.julialang.org/t/is-it-possible-to-store-the-jump-output-to-an-xlsx/95887)

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**Author:** [@Optimization](https://discourse.julialang.org/u/Optimization)\
**Replies:** 15\
**Last updated:** [March 20, 2023, 3:30pm UTC](https://discourse.julialang.org/t/is-it-possible-to-store-the-jump-output-to-an-xlsx/95887 "2023-03-20T15:30:19Z")

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Hi, I have a model that uses CPLEX to find optimal solution. When I call JuMP.value.(x) ir cannot show all elements in the terminal. So, I’ve tried write\_to\_file(model, "model.xlsx") to store it in excel file to see wh…

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## [AssertionError when deleting and updating constraint in JuMP using Mosek solver](https://discourse.julialang.org/t/assertionerror-when-deleting-and-updating-constraint-in-jump-using-mosek-solver/96238)

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**Author:** [@bobo](https://discourse.julialang.org/u/bobo)\
**Replies:** 2\
**Last updated:** [March 20, 2023, 12:53pm UTC](https://discourse.julialang.org/t/assertionerror-when-deleting-and-updating-constraint-in-jump-using-mosek-solver/96238 "2023-03-20T12:53:45Z")

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Dear team, I would like to sequentially solve a problem by updating a constraint, the way I do it is to delete and restate the constraint inside a loop. Once the problem is solved and I try to delete the constraint I ge…

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## [Dierckx to perform a derivative over a 2d spline](https://discourse.julialang.org/t/dierckx-to-perform-a-derivative-over-a-2d-spline/96101)

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**Author:** [@roi.holtzman](https://discourse.julialang.org/u/roi.holtzman)\
**Replies:** 8\
**Last updated:** [March 20, 2023, 11:24am UTC](https://discourse.julialang.org/t/dierckx-to-perform-a-derivative-over-a-2d-spline/96101 "2023-03-20T11:24:08Z")

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I cannot use Dierckx.jl to perform a derivative over a 2d spline even though from the documentation it seems like it should work. The help of the function derivative gives: Dierckx.derivative is a Function. # 10 metho…

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## [How to optimize Jacobian ForwardDiff.jl](https://discourse.julialang.org/t/how-to-optimize-jacobian-forwarddiff-jl/96177)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 2\
**Last updated:** [March 20, 2023, 8:20am UTC](https://discourse.julialang.org/t/how-to-optimize-jacobian-forwarddiff-jl/96177 "2023-03-20T08:20:41Z")

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Hello, I manual calculate Jacobian for the system function TM(u, p, t) U(y) = p\[8\] + p\[9\] / ( 1.0 + exp( -50.0 \* (y - p\[7\]) ) ) σ(x) = 1.0 / ( 1.0 + exp( -20.0 \* (x-p\[6\]) ) ) du1 = (-u\[1\] + p\[1\] \* log( 1.0 +…

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## [Can you use Gurobi's \`ObjNRelTol\` and \`ObjNAbsTol\`?](https://discourse.julialang.org/t/can-you-use-gurobis-objnreltol-and-objnabstol/96327)

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**Author:** [@gleyland](https://discourse.julialang.org/u/gleyland)\
**Replies:** 3\
**Last updated:** [March 20, 2023, 7:38am UTC](https://discourse.julialang.org/t/can-you-use-gurobis-objnreltol-and-objnabstol/96327 "2023-03-20T07:38:59Z")

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Hi, As for the subject. We’ve tried MOI.set(grb, Gurobi.MultiObjectiveAttribute("ObjNRelTol", 0.001)) But we got ERROR: LoadError: UndefVarError: MultiObjectiveAttribute not defined We’re on Gurobi 0.11.5, which se…

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## [Defining variables in JuMP](https://discourse.julialang.org/t/defining-variables-in-jump/95843)

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**Author:** [@kevinqiao](https://discourse.julialang.org/u/kevinqiao)\
**Replies:** 4\
**Last updated:** [March 20, 2023, 2:46am UTC](https://discourse.julialang.org/t/defining-variables-in-jump/95843 "2023-03-20T02:46:46Z")

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Hello, I have a question about defining variables in JuMP, normally, the variables are defined as @variable(model, testContinusVar) @variable(model, testIntegerVar, Int) @variable(model, testBinaryVar, Bin) And what i…

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