# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=378

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**Page:** 379

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## [Log every evaluation of ODE solver](https://discourse.julialang.org/t/log-every-evaluation-of-ode-solver/58107)

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**Author:** [@carlisto1250](https://discourse.julialang.org/u/carlisto1250)\
**Replies:** 5\
**Last updated:** [March 30, 2021, 5:37pm UTC](https://discourse.julialang.org/t/log-every-evaluation-of-ode-solver/58107 "2021-03-30T17:37:39Z")

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So, Im getting a lot of warnings (and consequently errors) about NaN and Instability problems while trying to solve my ODE system, like: Warning: NaN dt detected. Likely a NaN value in the state, parameters, or derivati…

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## [Nonlinear Schrodinger equation/quantumoptics.jl](https://discourse.julialang.org/t/nonlinear-schrodinger-equation-quantumoptics-jl/57436)

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**Author:** [@narayan](https://discourse.julialang.org/u/narayan)\
**Replies:** 4\
**Last updated:** [March 30, 2021, 1:13pm UTC](https://discourse.julialang.org/t/nonlinear-schrodinger-equation-quantumoptics-jl/57436 "2021-03-30T13:13:10Z")

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I saw in the documentation of quantumoptics.jl that it can simulate Spin F=1 spinor BEC which is basically three nonlinear coupled partial differential equations. I am wondering whether there is a way to solve GP equatio…

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## [Symbolics.jl, few reflections of beta user](https://discourse.julialang.org/t/symbolics-jl-few-reflections-of-beta-user/58140)

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**Author:** [@KZiemian](https://discourse.julialang.org/u/KZiemian)\
**Replies:** 2\
**Last updated:** [March 29, 2021, 10:23am UTC](https://discourse.julialang.org/t/symbolics-jl-few-reflections-of-beta-user/58140 "2021-03-29T10:23:51Z")

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Part of the March I spend learning basics of Symbolics.jl package and throwing questions and commits with one line changed (I now know, you shouldn’t do that) on JuliaSymbolics team. I want to share few reflections about…

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## [Using same x- and y-axis scales in Makie plots](https://discourse.julialang.org/t/using-same-x-and-y-axis-scales-in-makie-plots/58173)

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**Author:** [@wsshin](https://discourse.julialang.org/u/wsshin)\
**Replies:** 3\
**Last updated:** [March 29, 2021, 7:02pm UTC](https://discourse.julialang.org/t/using-same-x-and-y-axis-scales-in-makie-plots/58173 "2021-03-29T19:02:12Z")

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What is the simplest way to use the same scales in the x- and y-axis of the plots generated by Makie? For example, when visualizing a 5×3 array with heatmap() as using GLMakie heatmap(rand(5,3)) I want the individual …

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## [Makie - Weird error with Observables](https://discourse.julialang.org/t/makie-weird-error-with-observables/57960)

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**Author:** [@nandoconde](https://discourse.julialang.org/u/nandoconde)\
**Replies:** 11\
**Last updated:** [March 29, 2021, 11:17am UTC](https://discourse.julialang.org/t/makie-weird-error-with-observables/57960 "2021-03-29T11:17:03Z")

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Intro Hello!! I am having trouble creating a complete Makie scene that does what I want, because it errors: ERROR: MethodError: no method matching gl\_convert(::String) I’ll explain what I want first, and then the piec…

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## [Compose.jl has the radius of Forms tied to width](https://discourse.julialang.org/t/compose-jl-has-the-radius-of-forms-tied-to-width/58142)

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**Author:** [@SL6Trip](https://discourse.julialang.org/u/SL6Trip)\
**Replies:** 2\
**Last updated:** [March 29, 2021, 9:21am UTC](https://discourse.julialang.org/t/compose-jl-has-the-radius-of-forms-tied-to-width/58142 "2021-03-29T09:21:54Z")

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I was playing around with Compose.jl recently, when I realise that Forms that use a radius, such as circle have their radius tied to the width of the context window. See the two images and the code below for an example. …

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## [Julia version/CUDA compatibility with Quadro K4100 compute capbility of 3](https://discourse.julialang.org/t/julia-version-cuda-compatibility-with-quadro-k4100-compute-capbility-of-3/58053)

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**Author:** [@wizebt](https://discourse.julialang.org/u/wizebt)\
**Replies:** 1\
**Last updated:** [March 29, 2021, 5:49am UTC](https://discourse.julialang.org/t/julia-version-cuda-compatibility-with-quadro-k4100-compute-capbility-of-3/58053 "2021-03-29T05:49:16Z")

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Hi, I’m really struggling to find a compatible combination of versions: nVidia TK, Julia, CUDA.jl to execute a simple linear shift and add (see fct below) to efficiently run on my old Quadro K4100m GPU with compute capa…

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## [Horizontal y label with Plots.jl](https://discourse.julialang.org/t/horizontal-y-label-with-plots-jl/9967)

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**Author:** [@yha](https://discourse.julialang.org/u/yha)\
**Replies:** 4\
**Last updated:** [June 15, 2020, 3:36pm UTC](https://discourse.julialang.org/t/horizontal-y-label-with-plots-jl/9967 "2020-06-15T15:36:58Z")

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Is there any way to make the y axis label horizontal in Plots.jl (with pyplot backend)? Thanks

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## [Scatterplot with subplots for points](https://discourse.julialang.org/t/scatterplot-with-subplots-for-points/58097)

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**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 3\
**Last updated:** [March 28, 2021, 2:47am UTC](https://discourse.julialang.org/t/scatterplot-with-subplots-for-points/58097 "2021-03-28T02:47:50Z")

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I have several (x,y) locations, each of which has an array of values: n observations at each (x,y) location. I want to make a scatterplot of the (x,y) pairs, but instead of a circle at each location, I want a little den…

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## [Convex.jl set some configurations e.g. maximum iteration number, etc](https://discourse.julialang.org/t/convex-jl-set-some-configurations-e-g-maximum-iteration-number-etc/57724)

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**Author:** [@iHany](https://discourse.julialang.org/u/iHany)\
**Replies:** 3\
**Last updated:** [March 27, 2021, 11:58pm UTC](https://discourse.julialang.org/t/convex-jl-set-some-configurations-e-g-maximum-iteration-number-etc/57724 "2021-03-27T23:58:56Z")

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I would like to change some configurations of Convex.jl optimiser. I took a look at the documentation but I didn’t understand how to do it. Can anybody help me? Note that I’m mostly using Mosek.

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## [Reading Parquet file from raw bytes?](https://discourse.julialang.org/t/reading-parquet-file-from-raw-bytes/58099)

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**Author:** [@calebwin](https://discourse.julialang.org/u/calebwin)\
**Replies:** 0\
**Last updated:** [March 27, 2021, 11:49pm UTC](https://discourse.julialang.org/t/reading-parquet-file-from-raw-bytes/58099 "2021-03-27T23:49:41Z")

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I’m downloading a Parquet file over network using AWSS3.jl. Is there any way of parsing raw bytes stored in memory as Parquet?

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## [Integration fails: “Warning: Automatic dt set the starting dt as NaN, causing instability”](https://discourse.julialang.org/t/integration-fails-warning-automatic-dt-set-the-starting-dt-as-nan-causing-instability/56030)

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**Author:** [@Michael\_Barmann](https://discourse.julialang.org/u/Michael_Barmann)\
**Replies:** 10\
**Last updated:** [March 27, 2021, 5:38pm UTC](https://discourse.julialang.org/t/integration-fails-warning-automatic-dt-set-the-starting-dt-as-nan-causing-instability/56030 "2021-03-27T17:38:18Z")

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I’ve written some code to perform parameter estimation on a system of ODEs, and I keep getting the following error: ┌ Warning: First function call produced NaNs. Exiting. └ @ OrdinaryDiffEq C:\\Users\\Michael\\.julia\\packa…

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## [Data manipulation using dataframes](https://discourse.julialang.org/t/data-manipulation-using-dataframes/57972)

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**Author:** [@mjanun](https://discourse.julialang.org/u/mjanun)\
**Replies:** 7\
**Last updated:** [March 27, 2021, 1:07pm UTC](https://discourse.julialang.org/t/data-manipulation-using-dataframes/57972 "2021-03-27T13:07:39Z")

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Assume that a dataframe is given as: df\_a = DataFrame(Categ=\["Alpa","Beta","Gamma","Omega","Alpa","Beta","Gamma","Omega"\], T1 =rand(8),T2=rand(8),T3 =rand(8),T4 =rand(8),T5 =rand(8),T6 =rand(8),T7 =rand(8),T8 =rand(8),T…

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## [Training on Simple Loss gives error: No method matching +(::Float64, ::Array{Float64, 2})](https://discourse.julialang.org/t/training-on-simple-loss-gives-error-no-method-matching-float64-array-float64-2/58047)

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**Author:** [@kimlaberinto](https://discourse.julialang.org/u/kimlaberinto)\
**Replies:** 8\
**Last updated:** [March 27, 2021, 12:35pm UTC](https://discourse.julialang.org/t/training-on-simple-loss-gives-error-no-method-matching-float64-array-float64-2/58047 "2021-03-27T12:35:20Z")

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Hello everyone! I’m getting a weird error with Flux/DiffEqFlux with a simple loss function when I try to train. I’m not sure why it’s giving me a ERROR: LoadError: MethodError: no method matching +(::Float64, ::Array{Fl…

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## [Plotting Function With if-else Using Gadfly.jl](https://discourse.julialang.org/t/plotting-function-with-if-else-using-gadfly-jl/58020)

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**Author:** [@Adam\_Fleischhacker](https://discourse.julialang.org/u/Adam_Fleischhacker)\
**Replies:** 7\
**Last updated:** [March 26, 2021, 5:19pm UTC](https://discourse.julialang.org/t/plotting-function-with-if-else-using-gadfly-jl/58020 "2021-03-26T17:19:55Z")

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I am trying to define and plot a density function. However, it seems the if-else logic of my function is not supported for this kind of plot. Am I doing something wrong? ## graph density of spinner using Gadfly funct…

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## [Modeling Toolkit crash](https://discourse.julialang.org/t/modeling-toolkit-crash/58056)

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**Author:** [@Albert\_Zevelev](https://discourse.julialang.org/u/Albert_Zevelev)\
**Replies:** 4\
**Last updated:** [March 27, 2021, 10:19am UTC](https://discourse.julialang.org/t/modeling-toolkit-crash/58056 "2021-03-27T10:19:17Z")

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The following causes a crash in Julia v 1.6 using ModelingToolkit, NonlinearSolve, Plots @variables c, ℓ, L, K, Y, Π, v, r, w @parameters αK, αL, γ, EH, EK F(K,L,αK, αL) = (K^αK)\*(L^αL) FK(K,L,αK,αL) = αK\*(K^(αK-1…

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## [Iteration over 10 columns to calculate LinearRegression](https://discourse.julialang.org/t/iteration-over-10-columns-to-calculate-linearregression/58036)

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**Author:** [@statspy](https://discourse.julialang.org/u/statspy)\
**Replies:** 4\
**Last updated:** [March 27, 2021, 6:54am UTC](https://discourse.julialang.org/t/iteration-over-10-columns-to-calculate-linearregression/58036 "2021-03-27T06:54:29Z")

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I have a data frame with 10 columns(features) COL0 to COL9 and a column RESP. How do I calculate a LinearRegression Model for each pair COL0 to COL9 ~ RESP? I am expecting to get 10 graphs showing the Model and also a…

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## [Distributed Optimization | Working with multiple JuMP models](https://discourse.julialang.org/t/distributed-optimization-working-with-multiple-jump-models/58050)

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**Author:** [@asavasci](https://discourse.julialang.org/u/asavasci)\
**Replies:** 1\
**Last updated:** [March 26, 2021, 10:55pm UTC](https://discourse.julialang.org/t/distributed-optimization-working-with-multiple-jump-models/58050 "2021-03-26T22:55:23Z")

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Hi All, What is the best way to build a distributed optimization framework with JuMP? I have global variables associated with the central problem. I have local copies of the central variables associated with each subp…

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## [Needs help on \[IPOPT + coinhsl\] installation](https://discourse.julialang.org/t/needs-help-on-ipopt-coinhsl-installation/40583)

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**Author:** [@SingingKim](https://discourse.julialang.org/u/SingingKim)\
**Replies:** 5\
**Last updated:** [March 26, 2021, 7:28pm UTC](https://discourse.julialang.org/t/needs-help-on-ipopt-coinhsl-installation/40583 "2021-03-26T19:28:37Z")

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Hi, I would like to know a way to connect a linear solver other than MUMPS on Ipopt. m = Model(Ipopt.Optimizer) set\_optimizer\_attribute(m, "linear\_solver", "ma86") @variable(m, x \<= 5) @objective(m, Max, x) JuMP.optimiz…

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## [Dates.DateTime format in a DataFrame](https://discourse.julialang.org/t/dates-datetime-format-in-a-dataframe/57935)

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**Author:** [@Laco\_Kovac](https://discourse.julialang.org/u/Laco_Kovac)\
**Replies:** 4\
**Last updated:** [March 26, 2021, 7:49am UTC](https://discourse.julialang.org/t/dates-datetime-format-in-a-dataframe/57935 "2021-03-26T07:49:34Z")

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I am fetching content of the table and downloading it CSV (using LibPQ, DataFrames and CSV). This is the code converting DataFrame to CSV: executeResult = execute(conn, "SELECT \* FROM table") frame = DataFrame(executeR…

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## [Can you |\> gpu a GraphConv in GeometricFlux.jl?](https://discourse.julialang.org/t/can-you-gpu-a-graphconv-in-geometricflux-jl/57991)

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**Author:** [@Lian\_Yunlong](https://discourse.julialang.org/u/Lian_Yunlong)\
**Replies:** 0\
**Last updated:** [March 26, 2021, 6:39am UTC](https://discourse.julialang.org/t/can-you-gpu-a-graphconv-in-geometricflux-jl/57991 "2021-03-26T06:39:15Z")

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Dear developers and experts, I am trying to program with Flux.jl for a GNN project. There is a simple question: can I upload a model, form example, GraphConv in GeometricFlux.jl, to GPU via |\> gpu ? I tried this but did…

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## [Anything like fsspec for Julia?](https://discourse.julialang.org/t/anything-like-fsspec-for-julia/57968)

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**Author:** [@calebwin](https://discourse.julialang.org/u/calebwin)\
**Replies:** 2\
**Last updated:** [March 25, 2021, 11:13pm UTC](https://discourse.julialang.org/t/anything-like-fsspec-for-julia/57968 "2021-03-25T23:13:23Z")

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Is there anything like Python’s fsspec for Julia? I want to be able to read from a file but that file might be living locally, on the Internet, or in S3.

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## [Help with Performance in JuMP](https://discourse.julialang.org/t/help-with-performance-in-jump/57874)

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**Author:** [@jmcastro2109](https://discourse.julialang.org/u/jmcastro2109)\
**Replies:** 7\
**Last updated:** [March 25, 2021, 7:14pm UTC](https://discourse.julialang.org/t/help-with-performance-in-jump/57874 "2021-03-25T19:14:40Z")

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Hi, I am trying to solve a maximization problem using Gurobi/JuMP and I would really appreciate it if you could help me speed things up. Some background on the problem, essentially I am trying to maximize the expectati…

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## [How can I clear solver attributes in JuMP?](https://discourse.julialang.org/t/how-can-i-clear-solver-attributes-in-jump/57953)

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**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\
**Replies:** 3\
**Last updated:** [March 25, 2021, 7:05pm UTC](https://discourse.julialang.org/t/how-can-i-clear-solver-attributes-in-jump/57953 "2021-03-25T19:05:34Z")

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I need to solve a JuMP model sequentially using different solvers. Solver 1 has one set of attributes but I’m fine with the defaults for solver 2, at least for now. Unfortunately solver 2 complains about the options I se…

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## [Error Handling JuMP and CPLEX](https://discourse.julialang.org/t/error-handling-jump-and-cplex/56360)

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**Author:** [@Paul\_McVay](https://discourse.julialang.org/u/Paul_McVay)\
**Replies:** 25\
**Last updated:** [March 25, 2021, 5:56pm UTC](https://discourse.julialang.org/t/error-handling-jump-and-cplex/56360 "2021-03-25T17:56:30Z")

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What is the ideal way to handle CPLEX errors in JuMP and Julia? For example, sometimes I run optimize!(m) and it prints CPLEX Error 1292: Invalid choice of optimization method. However, if I use a try/catch and catch the…

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## [Interact vbox/hbox size](https://discourse.julialang.org/t/interact-vbox-hbox-size/57947)

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**Author:** [@saraflgarcia](https://discourse.julialang.org/u/saraflgarcia)\
**Replies:** 0\
**Last updated:** [March 25, 2021, 4:24pm UTC](https://discourse.julialang.org/t/interact-vbox-hbox-size/57947 "2021-03-25T16:24:48Z")

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Hello everyone, I am using Interact with Blink and Web IO. How can I define a vbox or hbox size and position within the window? Thanks in advance

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## [Meshcat - change scene properties](https://discourse.julialang.org/t/meshcat-change-scene-properties/57885)

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**Author:** [@saraflgarcia](https://discourse.julialang.org/u/saraflgarcia)\
**Replies:** 2\
**Last updated:** [March 25, 2021, 4:21pm UTC](https://discourse.julialang.org/t/meshcat-change-scene-properties/57885 "2021-03-25T16:21:23Z")

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Hi everyone, I’m using Meshcat with Blink and WebIO. How can I change its default properties concerning: Background color, Grid on/off, Visualizer size & position in Blink window Thanks in advance

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## [Convert output of GR.tricont() (GR.SVG) to something Plots can interact with](https://discourse.julialang.org/t/convert-output-of-gr-tricont-gr-svg-to-something-plots-can-interact-with/57943)

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**Author:** [@jacobusmmsmit](https://discourse.julialang.org/u/jacobusmmsmit)\
**Replies:** 0\
**Last updated:** [March 25, 2021, 4:13pm UTC](https://discourse.julialang.org/t/convert-output-of-gr-tricont-gr-svg-to-something-plots-can-interact-with/57943 "2021-03-25T16:13:55Z")

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Hello all, I’m trying to use GR’s tricont function as I can’t find out how to do this using Plots alone, and then put the output of this onto an existing plot generated by Plots. However, I cannot figure out how to turn…

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## [Weights are not updated](https://discourse.julialang.org/t/weights-are-not-updated/57730)

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**Author:** [@Sunny](https://discourse.julialang.org/u/Sunny)\
**Replies:** 8\
**Last updated:** [March 25, 2021, 3:50pm UTC](https://discourse.julialang.org/t/weights-are-not-updated/57730 "2021-03-25T15:50:30Z")

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I can’t update weights Here is an example struct hess\_nn net re p # Define inner constructor method function hess\_nn(net; p = nothing) \_p, re = Flux.destructure(net) if p === nothin…

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## [Autograd through loss function with derivatives in](https://discourse.julialang.org/t/autograd-through-loss-function-with-derivatives-in/57864)

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**Author:** [@RynoLaubscher](https://discourse.julialang.org/u/RynoLaubscher)\
**Replies:** 1\
**Last updated:** [March 25, 2021, 6:51am UTC](https://discourse.julialang.org/t/autograd-through-loss-function-with-derivatives-in/57864 "2021-03-25T06:51:46Z")

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Hi All, I am relatively new to Julia, coming from a C/C++ & Python background. I am absolutely loving Julia, but I am struggling a bit to build a simple PINN model using Zygote/Flux (and I tried ForwardDiff). I am using …

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