# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=422

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**Page:** 423

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## [StackOverflowError when fitting data to a von Mises distribution](https://discourse.julialang.org/t/stackoverflowerror-when-fitting-data-to-a-von-mises-distribution/45406)

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**Author:** [@oscarbelmon](https://discourse.julialang.org/u/oscarbelmon)\
**Replies:** 4\
**Last updated:** [September 11, 2020, 8:05am UTC](https://discourse.julialang.org/t/stackoverflowerror-when-fitting-data-to-a-von-mises-distribution/45406 "2020-09-11T08:05:26Z")

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Hi everyone. I’m trying to use Turing.jl to fit data to a von Mises circular distribution, and I am having some “stack overflow” issues during the fitting. This is my (very simple) code (coin flip adaptation): using T…

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## [Gradients from an SDE solver with callbacks](https://discourse.julialang.org/t/gradients-from-an-sde-solver-with-callbacks/46317)

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**Author:** [@MikeKlocCZ](https://discourse.julialang.org/u/MikeKlocCZ)\
**Replies:** 2\
**Last updated:** [September 11, 2020, 7:49am UTC](https://discourse.julialang.org/t/gradients-from-an-sde-solver-with-callbacks/46317 "2020-09-11T07:49:03Z")

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I am trying to get gradients of the solution of an SDE where a callback function is used in the solve command. It seems that the forward adjoint method is not compatible with the usage of callbacks as I get "ERROR: type…

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## [Package incompatibility](https://discourse.julialang.org/t/package-incompatibility/46420)

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**Author:** [@greg\_plowman](https://discourse.julialang.org/u/greg_plowman)\
**Replies:** 8\
**Last updated:** [September 11, 2020, 2:13am UTC](https://discourse.julialang.org/t/package-incompatibility/46420 "2020-09-11T02:13:36Z")

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I’m trying to find out what is holding back DataStructures package. Installed version is v0.17.20, latest version is 0.18.4. Attempting to explicitly add the latest version of DataStructures reveals a seemingly weird …

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## [How do I implement the Parametric ReLU (PReLU) function in Flux v0.11.1?](https://discourse.julialang.org/t/how-do-i-implement-the-parametric-relu-prelu-function-in-flux-v0-11-1/46310)

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**Author:** [@RiN](https://discourse.julialang.org/u/RiN)\
**Replies:** 5\
**Last updated:** [September 10, 2020, 1:05pm UTC](https://discourse.julialang.org/t/how-do-i-implement-the-parametric-relu-prelu-function-in-flux-v0-11-1/46310 "2020-09-10T13:05:59Z")

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I want to handle the Parametric ReLU (PReLU) function in Flux v0.11.1. https://arxiv.org/abs/1502.01852 I’m trying to implement it in Flux based on the following post, but the version of Flux in this post is old and ma…

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## [Current list of colorschemes in Plots.jl](https://discourse.julialang.org/t/current-list-of-colorschemes-in-plots-jl/5420)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 30\
**Last updated:** [September 10, 2020, 10:54am UTC](https://discourse.julialang.org/t/current-list-of-colorschemes-in-plots-jl/5420 "2020-09-10T10:54:32Z")

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Is there a command to find out all the currently defined colorschemes? The one below that used to work is not working anymore: PlotUtils.\_gradients |\> keys |\> showall

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## [How to assign value to a matrix in an indicator constraint](https://discourse.julialang.org/t/how-to-assign-value-to-a-matrix-in-an-indicator-constraint/46314)

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**Author:** [@sogrbilja](https://discourse.julialang.org/u/sogrbilja)\
**Replies:** 15\
**Last updated:** [September 10, 2020, 9:37am UTC](https://discourse.julialang.org/t/how-to-assign-value-to-a-matrix-in-an-indicator-constraint/46314 "2020-09-10T09:37:34Z")

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Is it possible and how to assign values to POSITION\[R,C\] matrix in the indicator constraint @variable(premex, ROLNA\[R in keys(\_ROWS), C in keys(\_COLS), i\_k in keys(\_IMAGES\_ALL)\], Bin) @variable(premex, POSITION…

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## [JuMP Stopped Working Today](https://discourse.julialang.org/t/jump-stopped-working-today/46348)

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**Author:** [@vattyamv](https://discourse.julialang.org/u/vattyamv)\
**Replies:** 4\
**Last updated:** [September 9, 2020, 11:07pm UTC](https://discourse.julialang.org/t/jump-stopped-working-today/46348 "2020-09-09T23:07:52Z")

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Hi, I’ve been using JuMP for a project and it stopped working today after I installed Gurobi. I get ERROR: LoadError: MethodError: no method matching Model(::Type{Gurobi.Optimizer}) when I set the solver to Gurobi, but i…

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## [Mapping functions using CuArrays](https://discourse.julialang.org/t/mapping-functions-using-cuarrays/46300)

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**Author:** [@manderson](https://discourse.julialang.org/u/manderson)\
**Replies:** 2\
**Last updated:** [September 9, 2020, 4:12pm UTC](https://discourse.julialang.org/t/mapping-functions-using-cuarrays/46300 "2020-09-09T16:12:00Z")

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I am attempting to map functions to the GPU using CUDA, CuArrays, and map(). My ultimate goal is to take what is currently a serial grid search and run each reduction in parallel on the GPU. For this, I need to pass a v…

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## [Diffeq.jl problem terminology](https://discourse.julialang.org/t/diffeq-jl-problem-terminology/46024)

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**Author:** [@pkairys](https://discourse.julialang.org/u/pkairys)\
**Replies:** 3\
**Last updated:** [September 8, 2020, 8:09pm UTC](https://discourse.julialang.org/t/diffeq-jl-problem-terminology/46024 "2020-09-08T20:09:03Z")

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I’m trying to clarify a bit of terminology that is popping up in the DifferentialEquations.jl documentation relating to the “problem size” and “large systems.” I have a linear matrix differential equation like \\partial\_…

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## [CSV read fails with keyword arguments](https://discourse.julialang.org/t/csv-read-fails-with-keyword-arguments/46231)

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**Author:** [@madeleineudell](https://discourse.julialang.org/u/madeleineudell)\
**Replies:** 7\
**Last updated:** [September 8, 2020, 4:59pm UTC](https://discourse.julialang.org/t/csv-read-fails-with-keyword-arguments/46231 "2020-09-08T16:59:19Z")

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I’m having difficulties getting a basic CSV file to read. I can read a file without keyword options: acs = CSV.read("file.csv", limit=10); but adding keyword options, like acs = CSV.read("file.csv"; null="NA"); resul…

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## [Cannot Access variable values through Gurobi callback](https://discourse.julialang.org/t/cannot-access-variable-values-through-gurobi-callback/46138)

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**Author:** [@hassanis](https://discourse.julialang.org/u/hassanis)\
**Replies:** 2\
**Last updated:** [September 8, 2020, 12:38pm UTC](https://discourse.julialang.org/t/cannot-access-variable-values-through-gurobi-callback/46138 "2020-09-08T12:38:26Z")

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Hello, I’m trying to access my variable values through a callback on Gurobi (Gurobi Optimizer version 9.0.2; Pkg v0.8.1) (& JuMP v0.21.3). I’m able to run a few functions (eg. cbget\_mipsol\_obj), but ‘mipsol\_sol’ is not …

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## [Warp images and coordinates](https://discourse.julialang.org/t/warp-images-and-coordinates/46256)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 1\
**Last updated:** [September 8, 2020, 12:12pm UTC](https://discourse.julialang.org/t/warp-images-and-coordinates/46256 "2020-09-08T12:12:48Z")

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I’m transforming an image using ImageTransformations.wrap, but I also want to use the same transformation to transform some coordinates. The idea is that a coordinate in the original image should be transformed to a coor…

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## [\[ANN\] Announcing Flux3D.jl, 3D Vision library](https://discourse.julialang.org/t/ann-announcing-flux3d-jl-3d-vision-library/46258)

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**Author:** [@Nirmal\_Suthar](https://discourse.julialang.org/u/Nirmal_Suthar)\
**Replies:** 0\
**Last updated:** [September 8, 2020, 12:09pm UTC](https://discourse.julialang.org/t/ann-announcing-flux3d-jl-3d-vision-library/46258 "2020-09-08T12:09:25Z")

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Dear Julia Community, I am really excited to share Flux3D.jl with all. It is a 3D vision library, written completely in Julia. This package utilizes Flux.jl and Zygote.jl as its building blocks for training 3D vision mo…

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## [Problems trying to run JuMP and GLPK](https://discourse.julialang.org/t/problems-trying-to-run-jump-and-glpk/46175)

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**Author:** [@HerAdri](https://discourse.julialang.org/u/HerAdri)\
**Replies:** 4\
**Last updated:** [September 8, 2020, 8:08am UTC](https://discourse.julialang.org/t/problems-trying-to-run-jump-and-glpk/46175 "2020-09-08T08:08:53Z")

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When I try to run JuMP packets, GLPK with the command using JuMP, GLPK I get the following alert: m = Model(GLPK.Optimizer) ERROR: MethodError: no method matching Model(::Type{GLPK.Optimizer}) Closest candidates are: …

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## [Adding SOS1 constraint problem](https://discourse.julialang.org/t/adding-sos1-constraint-problem/46209)

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**Author:** [@sogrbilja](https://discourse.julialang.org/u/sogrbilja)\
**Replies:** 10\
**Last updated:** [September 8, 2020, 5:57am UTC](https://discourse.julialang.org/t/adding-sos1-constraint-problem/46209 "2020-09-08T05:57:57Z")

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I am trying to add a simple SOS1 constraint, but getting the following error MethodError: no method matching build\_constraint(::JuMP.var"#\_error#68"{Symbol}, ::Array{VariableRef,2}, ::SOS1) for @constrain…

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## [ODE where u and du are different sizes](https://discourse.julialang.org/t/ode-where-u-and-du-are-different-sizes/46213)

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**Author:** [@klowrey](https://discourse.julialang.org/u/klowrey)\
**Replies:** 11\
**Last updated:** [September 8, 2020, 1:30am UTC](https://discourse.julialang.org/t/ode-where-u-and-du-are-different-sizes/46213 "2020-09-08T01:30:03Z")

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I didn’t see an obvious solution in the docs so I thought I would ask: I have an ODE problem where the state is a different size than the change in state. Specifically, lets say my state of \[pos; vel\] includes a quatern…

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## [Feeding solver parameters as a dictionary](https://discourse.julialang.org/t/feeding-solver-parameters-as-a-dictionary/46227)

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**Author:** [@varun7rs](https://discourse.julialang.org/u/varun7rs)\
**Replies:** 2\
**Last updated:** [September 8, 2020, 12:06am UTC](https://discourse.julialang.org/t/feeding-solver-parameters-as-a-dictionary/46227 "2020-09-08T00:06:13Z")

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I’d like to set solver parameters not manually but by just passing a dictionary and unpacking the keys and arguments using the splat operator. When I tried doing this: fRAN = Model(solver = GurobiSolver(parameters...)) …

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## [Dual number is unidentified by OpenModelica while using user-defined function with autodiff in JuMP!](https://discourse.julialang.org/t/dual-number-is-unidentified-by-openmodelica-while-using-user-defined-function-with-autodiff-in-jump/45740)

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**Author:** [@pandeysudan27](https://discourse.julialang.org/u/pandeysudan27)\
**Replies:** 6\
**Last updated:** [September 7, 2020, 10:20pm UTC](https://discourse.julialang.org/t/dual-number-is-unidentified-by-openmodelica-while-using-user-defined-function-with-autodiff-in-jump/45740 "2020-09-07T22:20:45Z")

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Hi, I am trying to solve a simple set point tracking MPC using JuMP. The model I am trying is \\frac{dx}{dt} =a+bsin(x). There is no issues in JuMP while discretizing it in Julia. However, when the model is used from …

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## [Use of CartesianIndices with CUDA?](https://discourse.julialang.org/t/use-of-cartesianindices-with-cuda/42160)

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**Author:** [@Ferran\_Mazzanti](https://discourse.julialang.org/u/Ferran_Mazzanti)\
**Replies:** 6\
**Last updated:** [September 7, 2020, 3:01pm UTC](https://discourse.julialang.org/t/use-of-cartesianindices-with-cuda/42160 "2020-09-07T15:01:10Z")

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Hi, I have a function that iterates over all elements of a four-dimenasional array full of CartesianIndices elements 21×31×41×51 Array{CartesianIndex{4},4}: \[:, :, 1, 1\] = CartesianIndex(1, 1, 1, 1) … CartesianInde…

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## [Mac's AMD GPU](https://discourse.julialang.org/t/macs-amd-gpu/33014)

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**Author:** [@tomtom](https://discourse.julialang.org/u/tomtom)\
**Replies:** 61\
**Last updated:** [September 7, 2020, 2:34pm UTC](https://discourse.julialang.org/t/macs-amd-gpu/33014 "2020-09-07T14:34:18Z")

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the new Mac Pro seems to be very powerful and can be equipped with multiple powerful AMD GPUs. But OpenCL.jl seems very inactive. do we have any chance to unleash the power of Mac’s GPU using Julia? (Mac is not supporti…

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## [How can I save this data with CSV?](https://discourse.julialang.org/t/how-can-i-save-this-data-with-csv/46159)

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**Author:** [@Iulian.Cioarca](https://discourse.julialang.org/u/Iulian.Cioarca)\
**Replies:** 5\
**Last updated:** [September 7, 2020, 10:53am UTC](https://discourse.julialang.org/t/how-can-i-save-this-data-with-csv/46159 "2020-09-07T10:53:46Z")

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I am confused about the CSV way of writing files. My problem is really simple: I have two arrays and I want to save them in a .csv file, but I also want the following column names above my data: Voltage \[V\] and Current…

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## [Flux: multiple input of unequal dimensions](https://discourse.julialang.org/t/flux-multiple-input-of-unequal-dimensions/46094)

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**Author:** [@johnbb](https://discourse.julialang.org/u/johnbb)\
**Replies:** 4\
**Last updated:** [September 7, 2020, 8:52am UTC](https://discourse.julialang.org/t/flux-multiple-input-of-unequal-dimensions/46094 "2020-09-07T08:52:29Z")

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Assume I have data as follows n = 1000 y = rand(n) x1 = rand(10, n) x2 = rand(20,20,1,n) and would like to a apply one (or more) Conv layers to x2 before it is flattened and concatenated with x1 in a Dense layer. How…

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## [AssertionError rowub \< posinf JuMP model](https://discourse.julialang.org/t/assertionerror-rowub-posinf-jump-model/45976)

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**Author:** [@dharik13](https://discourse.julialang.org/u/dharik13)\
**Replies:** 3\
**Last updated:** [September 6, 2020, 9:59pm UTC](https://discourse.julialang.org/t/assertionerror-rowub-posinf-jump-model/45976 "2020-09-06T21:59:47Z")

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Hello, I am new to using Julia/JuMP (coming from python) and I am encountering the following error when trying to solve an LP model using Gurobi I dont quite follow what the statement “AssertionError: rowub\[i\] \< posi…

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## [Multiple lag() in TimeSeries doesn't work in one line](https://discourse.julialang.org/t/multiple-lag-in-timeseries-doesnt-work-in-one-line/46154)

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**Author:** [@Jaepil\_Lee](https://discourse.julialang.org/u/Jaepil_Lee)\
**Replies:** 1\
**Last updated:** [September 6, 2020, 6:39pm UTC](https://discourse.julialang.org/t/multiple-lag-in-timeseries-doesnt-work-in-one-line/46154 "2020-09-06T18:39:31Z")

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Hello Julia users! I have been playing with TimeSeries package and found one operation that doesn’t make much sense to me. I know that applying lag() to a Tx1 TimeArray A creates a (T-1)x1 TimeArray and lag(A)./A create…

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## [ArchGDAL.getfield() error](https://discourse.julialang.org/t/archgdal-getfield-error/45770)

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**Author:** [@erlebach](https://discourse.julialang.org/u/erlebach)\
**Replies:** 2\
**Last updated:** [September 6, 2020, 6:01pm UTC](https://discourse.julialang.org/t/archgdal-getfield-error/45770 "2020-09-06T18:01:02Z")

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Hi, I have the following code which aims to transform the data contained in a layer into a DataFrame, which I picked up online. This works for the most part. Notice the try/catch, which slows the code down a lot, and I …

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## [Is there any graph / graph plotting package that allow edges having different color and length based on its identity and weight?](https://discourse.julialang.org/t/is-there-any-graph-graph-plotting-package-that-allow-edges-having-different-color-and-length-based-on-its-identity-and-weight/45982)

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**Author:** [@liuyxpp](https://discourse.julialang.org/u/liuyxpp)\
**Replies:** 2\
**Last updated:** [September 6, 2020, 8:55am UTC](https://discourse.julialang.org/t/is-there-any-graph-graph-plotting-package-that-allow-edges-having-different-color-and-length-based-on-its-identity-and-weight/45982 "2020-09-06T08:55:23Z")

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Usecase: Displaying the architecture of block copolymers. Block copolymers consist of many blocks each of which contains identical monomers and are connected by covalent bond at their joints. I think the natural way to d…

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## [\`Conv\` is 2x slow than pytorch \`Conv\` on cpu](https://discourse.julialang.org/t/conv-is-2x-slow-than-pytorch-conv-on-cpu/39802)

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**Author:** [@yiyuezhuo](https://discourse.julialang.org/u/yiyuezhuo)\
**Replies:** 9\
**Last updated:** [September 6, 2020, 5:43am UTC](https://discourse.julialang.org/t/conv-is-2x-slow-than-pytorch-conv-on-cpu/39802 "2020-09-06T05:43:34Z")

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Example: using BenchmarkTools using Flux conv = Conv((7,7), 3 =\> 64; stride=2, pad=3) dummy = randn(Float32, 224, 224, 3, 2); conv(dummy) # ignore compile time @benchmark conv(dummy) #= BenchmarkTools.Trial: memor…

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## [RotatedSecondOrderCone() usage](https://discourse.julialang.org/t/rotatedsecondordercone-usage/46019)

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**Author:** [@asavasci](https://discourse.julialang.org/u/asavasci)\
**Replies:** 8\
**Last updated:** [September 5, 2020, 8:23pm UTC](https://discourse.julialang.org/t/rotatedsecondordercone-usage/46019 "2020-09-05T20:23:45Z")

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Hi, how should I use RotatedSecondOrderCone() object when converting soc constraint x^2 + y^2 \<= wz where w\>=0, z\>= 0 ? I tried to resemble the constraint to given syntax in the manual . However, I am not sure if I am d…

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## [How register a function in JuMP and use a subarray as args](https://discourse.julialang.org/t/how-register-a-function-in-jump-and-use-a-subarray-as-args/46043)

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**Author:** [@Behemoth-s](https://discourse.julialang.org/u/Behemoth-s)\
**Replies:** 2\
**Last updated:** [September 5, 2020, 5:26pm UTC](https://discourse.julialang.org/t/how-register-a-function-in-jump-and-use-a-subarray-as-args/46043 "2020-09-05T17:26:47Z")

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I would register constraint somehow like c1 as a user-defined function using Ipopt using JuMP using MathOptInterface const MOI = MathOptInterface d1 = 4 d2 = 5 d3 = 6 para\_a = rand(d3) m = Model(optimizer\_with\_attrib…

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## [Power of a given value into CUDA.jl kernel](https://discourse.julialang.org/t/power-of-a-given-value-into-cuda-jl-kernel/46082)

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**Author:** [@eufosc](https://discourse.julialang.org/u/eufosc)\
**Replies:** 2\
**Last updated:** [September 5, 2020, 2:54pm UTC](https://discourse.julialang.org/t/power-of-a-given-value-into-cuda-jl-kernel/46082 "2020-09-05T14:54:02Z")

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Hi! I’m using Julia V1.4.2 + CUDA.jl and I have an issue with a CUDA kernel. I’m trying to power the elements of an array, just like the example below: using CUDA T = \[0.0 0.666667 0.0; -0.333333 -0.25 0.333333; -0.5…

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