# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=495

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**Page:** 496

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## [Julia package to find all local extrema of a function in a interval?](https://discourse.julialang.org/t/julia-package-to-find-all-local-extrema-of-a-function-in-a-interval/25067)

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**Author:** [@longemen3000](https://discourse.julialang.org/u/longemen3000)\
**Replies:** 3\
**Last updated:** [June 8, 2019, 5:55am UTC](https://discourse.julialang.org/t/julia-package-to-find-all-local-extrema-of-a-function-in-a-interval/25067 "2019-06-08T05:55:35Z")

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i’m looking for a package to find a list of local minima of an univariate function, in a given interval, someone knows if something like this exists?

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## [Automatic differentiation - Julia implementation advantages](https://discourse.julialang.org/t/automatic-differentiation-julia-implementation-advantages/24975)

<div class="topic-metadata">

**Author:** [@lwhitefox](https://discourse.julialang.org/u/lwhitefox)\
**Replies:** 8\
**Last updated:** [June 7, 2019, 3:35pm UTC](https://discourse.julialang.org/t/automatic-differentiation-julia-implementation-advantages/24975 "2019-06-07T15:35:41Z")

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I’m interested in utilizing Julia for some ML tasks; in perusing some discussions from this discourse and the Julia slack in the past, I have a vague memory of having read some claims regarding advantages of Juila implem…

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## [Calling a function inside of a Kernel](https://discourse.julialang.org/t/calling-a-function-inside-of-a-kernel/25023)

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**Author:** [@James\_Stickney](https://discourse.julialang.org/u/James_Stickney)\
**Replies:** 4\
**Last updated:** [June 7, 2019, 2:23pm UTC](https://discourse.julialang.org/t/calling-a-function-inside-of-a-kernel/25023 "2019-06-07T14:23:22Z")

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This one has my head hurting. I’m not even sure how to explain the problem, but I’ll do my best. I am working on a project using CUDAnative and one of my kernels takes a function as an argument. I would like to pass a…

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## [Starting Cuda programming with Julia](https://discourse.julialang.org/t/starting-cuda-programming-with-julia/25009)

<div class="topic-metadata">

**Author:** [@wiktorkujawa](https://discourse.julialang.org/u/wiktorkujawa)\
**Replies:** 3\
**Last updated:** [June 7, 2019, 1:05am UTC](https://discourse.julialang.org/t/starting-cuda-programming-with-julia/25009 "2019-06-07T01:05:32Z")

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Hi, I want to start programming with CUDA language. I just bought new notebook with NVIDIA GeForce GTX 1050 graphic card and windows 10 system. I personally use Linux mint, so I want to install it on my new notebook. I r…

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## [Plots Ticks Axis Override](https://discourse.julialang.org/t/plots-ticks-axis-override/25026)

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**Author:** [@fer](https://discourse.julialang.org/u/fer)\
**Replies:** 0\
**Last updated:** [June 6, 2019, 9:23pm UTC](https://discourse.julialang.org/t/plots-ticks-axis-override/25026 "2019-06-06T21:23:01Z")

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I am using the Plots library and I create plots as attached to this post. The y-ticks label for instance of the plot of “x4” are not nice and I would like to find an automatic way to arrange them (I created this plots i…

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## [How can I shade an area under a curve between two lines?](https://discourse.julialang.org/t/how-can-i-shade-an-area-under-a-curve-between-two-lines/24897)

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**Author:** [@Alessandro\_Vivas](https://discourse.julialang.org/u/Alessandro_Vivas)\
**Replies:** 5\
**Last updated:** [June 6, 2019, 8:26pm UTC](https://discourse.julialang.org/t/how-can-i-shade-an-area-under-a-curve-between-two-lines/24897 "2019-06-06T20:26:27Z")

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I am plotting a normal curve and I want shaded some areas in this curve. I want to shaded to values minor than -1.96 e greater than 1.96. I tried some options: fill and fill area but I didn’t get sucess. x = rand( Norma…

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## [Semi-continuous variables: JuMP and Cplex solver](https://discourse.julialang.org/t/semi-continuous-variables-jump-and-cplex-solver/24966)

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**Author:** [@bienpierre](https://discourse.julialang.org/u/bienpierre)\
**Replies:** 2\
**Last updated:** [June 6, 2019, 4:08pm UTC](https://discourse.julialang.org/t/semi-continuous-variables-jump-and-cplex-solver/24966 "2019-06-06T16:08:17Z")

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Hello, I have a semi-continuous variable, the domain is {0} U \[l,u\]. Example is: using JuMP using CPLEX MyModel = Model(with\_optimizer(CPLEX.Optimizer)) @variable(MyModel, zz) @constraint(MyModel, zz in MOI.Semicontin…

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## [Normalization of histograms](https://discourse.julialang.org/t/normalization-of-histograms/25007)

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**Author:** [@woutersj](https://discourse.julialang.org/u/woutersj)\
**Replies:** 1\
**Last updated:** [June 6, 2019, 1:22pm UTC](https://discourse.julialang.org/t/normalization-of-histograms/25007 "2019-06-06T13:22:40Z")

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This used to work in v0.6.3: using StatsBase normalize(fit(Histogram,rand(100),closed=:left)) In v1.1.0 I get UndefVarError: normalize not defined. Is this a bug or has the syntax changed?

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## [Configuring MPI.jl to run on XC-40 / KNL with craype and cray-mpich](https://discourse.julialang.org/t/configuring-mpi-jl-to-run-on-xc-40-knl-with-craype-and-cray-mpich/20197)

<div class="topic-metadata">

**Author:** [@frankwillmore](https://discourse.julialang.org/u/frankwillmore)\
**Replies:** 10\
**Last updated:** [June 6, 2019, 2:56am UTC](https://discourse.julialang.org/t/configuring-mpi-jl-to-run-on-xc-40-knl-with-craype-and-cray-mpich/20197 "2019-06-06T02:56:12Z")

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I am attempting to configure the MPI.jl package to run in Julia 1.0.3 on theta, a Cray XC-40/KNL. Cross-compilation has not been an issue, but interfacing to the CrayPE and Cray-MPICH are currently stumping me. I have be…

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## [Spiking Neural Network](https://discourse.julialang.org/t/spiking-neural-network/24908)

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**Author:** [@grero](https://discourse.julialang.org/u/grero)\
**Replies:** 5\
**Last updated:** [June 4, 2019, 11:36pm UTC](https://discourse.julialang.org/t/spiking-neural-network/24908 "2019-06-04T23:36:42Z")

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Hi, I am trying to implement the spiking neural network model in this paper https://www.frontiersin.org/articles/10.3389/fninf.2018.00079/full and I wanted to use DifferentialEquations.jl Basically, the model consists o…

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## [JULIA\_WORKER\_TIMEOUT error](https://discourse.julialang.org/t/julia-worker-timeout-error/24866)

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**Author:** [@abx](https://discourse.julialang.org/u/abx)\
**Replies:** 7\
**Last updated:** [June 4, 2019, 6:22pm UTC](https://discourse.julialang.org/t/julia-worker-timeout-error/24866 "2019-06-04T18:22:48Z")

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I am working on a fairly big code base written in Julia 1.1 and I am experiencing erratic issues with parallel processing. It is very annoying as most of the time everything works perfectly. The application is mainly co…

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## [Automatic differentiation of an objective, which already uses AD tools](https://discourse.julialang.org/t/automatic-differentiation-of-an-objective-which-already-uses-ad-tools/24864)

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**Author:** [@ArnoStrouwen](https://discourse.julialang.org/u/ArnoStrouwen)\
**Replies:** 3\
**Last updated:** [June 4, 2019, 9:08am UTC](https://discourse.julialang.org/t/automatic-differentiation-of-an-objective-which-already-uses-ad-tools/24864 "2019-06-04T09:08:40Z")

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I’m searching for parameters u to maximize a function obj(u). This objective function, however, depends on the derivatives of another function y(u,p), with regards to the parameters p. An example: abstract type S1 end …

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## [Any Julia library for managing data series with automatic transformation](https://discourse.julialang.org/t/any-julia-library-for-managing-data-series-with-automatic-transformation/24818)

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**Author:** [@nxtruong](https://discourse.julialang.org/u/nxtruong)\
**Replies:** 7\
**Last updated:** [June 3, 2019, 6:03pm UTC](https://discourse.julialang.org/t/any-julia-library-for-managing-data-series-with-automatic-transformation/24818 "2019-06-03T18:03:36Z")

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I need to manage multiple data series (each is like a sequence of values, or a column in a data frame). Associated with each is an automatic transformation of the data in and out of the storage. For example, these can be…

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## [How to parallelize computation and plotting?](https://discourse.julialang.org/t/how-to-parallelize-computation-and-plotting/24746)

<div class="topic-metadata">

**Author:** [@cserteGT3](https://discourse.julialang.org/u/cserteGT3)\
**Replies:** 7\
**Last updated:** [June 3, 2019, 1:11pm UTC](https://discourse.julialang.org/t/how-to-parallelize-computation-and-plotting/24746 "2019-06-03T13:11:58Z")

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The title is a bit misleading, because I would like to get a sensor’s data and plot it immadiately (so not a result of simulation or something). I get the values via TCP connection (which I can setup and print the values…

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## [Pmap structure master process computes too](https://discourse.julialang.org/t/pmap-structure-master-process-computes-too/24886)

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**Author:** [@Wikunia](https://discourse.julialang.org/u/Wikunia)\
**Replies:** 1\
**Last updated:** [June 3, 2019, 11:18am UTC](https://discourse.julialang.org/t/pmap-structure-master-process-computes-too/24886 "2019-06-03T11:18:09Z")

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What does happen if the master process handles the part part after remotecall\_fetch but computes itself as well? Does everything work or are there some catches? I have two pmap like functions nested and the first calls …

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## [Plots.jl atrribute for full border](https://discourse.julialang.org/t/plots-jl-atrribute-for-full-border/15934)

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**Author:** [@ecx2093](https://discourse.julialang.org/u/ecx2093)\
**Replies:** 5\
**Last updated:** [June 3, 2019, 2:03am UTC](https://discourse.julialang.org/t/plots-jl-atrribute-for-full-border/15934 "2019-06-03T02:03:30Z")

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Hello Does anybody know the plot attribute for creating a border around the entire plot (here I need borders on the top and right without ticks, just the lines)

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## [A faster pow(x,1/12) function available in Fast12thRoot.jl](https://discourse.julialang.org/t/a-faster-pow-x-1-12-function-available-in-fast12throot-jl/10893)

<div class="topic-metadata">

**Author:** [@MrBelette](https://discourse.julialang.org/u/MrBelette)\
**Replies:** 12\
**Last updated:** [June 3, 2019, 1:47am UTC](https://discourse.julialang.org/t/a-faster-pow-x-1-12-function-available-in-fast12throot-jl/10893 "2019-06-03T01:47:13Z")

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New to Julia, so hopefully I’ve chosen the correct category for posting this. Actuaries use x^(1/12) very often in order to convert annualized numbers to their monthly compounded equivalent. I had an itch that had to be…

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## [Command line parameters in parallel](https://discourse.julialang.org/t/command-line-parameters-in-parallel/24863)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 0\
**Last updated:** [June 2, 2019, 8:26pm UTC](https://discourse.julialang.org/t/command-line-parameters-in-parallel/24863 "2019-06-02T20:26:38Z")

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If I’ve got a julia script that’s using Distributed for shared memory parallel computing, and I want to read in a command line parameter (i.e., number of iterations per worker), what’s the right way to do this?

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## [Is this a fair GPU benchmark?](https://discourse.julialang.org/t/is-this-a-fair-gpu-benchmark/24814)

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**Author:** [@marius311](https://discourse.julialang.org/u/marius311)\
**Replies:** 1\
**Last updated:** [June 1, 2019, 2:31pm UTC](https://discourse.julialang.org/t/is-this-a-fair-gpu-benchmark/24814 "2019-06-01T14:31:20Z")

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Hi, I’m totally new to GPU computing, really enjoying the ease of using Julia GPU libraries, but had a question about whether my benchmark code is correct, or whether I’m leaving something on the table. The computation …

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## [Idea: Rewriting Love2d for Julia allows to code more interactive diagram applications and games](https://discourse.julialang.org/t/idea-rewriting-love2d-for-julia-allows-to-code-more-interactive-diagram-applications-and-games/24819)

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**Author:** [@freemint](https://discourse.julialang.org/u/freemint)\
**Replies:** 0\
**Last updated:** [May 31, 2019, 11:31pm UTC](https://discourse.julialang.org/t/idea-rewriting-love2d-for-julia-allows-to-code-more-interactive-diagram-applications-and-games/24819 "2019-05-31T23:31:33Z")

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Hello, i think Julia could really gain from having something similar to Love2d but with Julia instead of LUA. It is a game engine which loads a LUA file and calls LUA functions defined in their to update the applicatio…

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## [OpenCV support](https://discourse.julialang.org/t/opencv-support/24828)

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**Author:** [@javadba](https://discourse.julialang.org/u/javadba)\
**Replies:** 1\
**Last updated:** [June 1, 2019, 5:58am UTC](https://discourse.julialang.org/t/opencv-support/24828 "2019-06-01T05:58:57Z")

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The OpenCV repo seems moribund: GitHub - maxruby/OpenCV.jl: The OpenCV (C++) interface for Julia . Is there any more recent activity in another repo or framework? Will I instead likely need to stick to python (or c++)…

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## [Should memory in worker be freed after fetching result?](https://discourse.julialang.org/t/should-memory-in-worker-be-freed-after-fetching-result/24780)

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**Author:** [@aramirezreyes](https://discourse.julialang.org/u/aramirezreyes)\
**Replies:** 1\
**Last updated:** [May 31, 2019, 10:22pm UTC](https://discourse.julialang.org/t/should-memory-in-worker-be-freed-after-fetching-result/24780 "2019-05-31T22:22:11Z")

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Hi there! I was doing some processing using Julia 1.1.0 and ClusterManagers v0.3.2 I have two nodes and I tried launching a function in the second node using the worker 3 with fetch(@spawnat 3 function()) This is bec…

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## [GLMakie fails test on FreeBSD 12, Julia 1.1.0](https://discourse.julialang.org/t/glmakie-fails-test-on-freebsd-12-julia-1-1-0/24783)

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**Author:** [@ko56](https://discourse.julialang.org/u/ko56)\
**Replies:** 9\
**Last updated:** [May 31, 2019, 9:59pm UTC](https://discourse.julialang.org/t/glmakie-fails-test-on-freebsd-12-julia-1-1-0/24783 "2019-05-31T21:59:11Z")

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(v1.1) pkg\> test GLMakie Testing GLMakie Resolving package versions... Status \`/tmp/tmp8KVQL5/Manifest.toml\` \[621f4979\] AbstractFFTs v0.4.1 \[537997a7\] AbstractPlotting v0.9.7 ... \[cf7118a7\] UUIDs \[\`@stdl…

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## [@distributed fails for many workers?](https://discourse.julialang.org/t/distributed-fails-for-many-workers/24145)

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**Author:** [@dkiese](https://discourse.julialang.org/u/dkiese)\
**Replies:** 21\
**Last updated:** [May 14, 2019, 10:10am UTC](https://discourse.julialang.org/t/distributed-fails-for-many-workers/24145 "2019-05-14T10:10:19Z")

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Hello folks, I am currently running some data analysis on a cluster with 68 cores per node. To this end I set up a SharedArray for 68 workers and let them operate on it via @sync @distributed. For small datasets this wo…

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## [Beginner - NumericalMath -- Use trapz routine and Number type](https://discourse.julialang.org/t/beginner-numericalmath-use-trapz-routine-and-number-type/24777)

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**Author:** [@fer](https://discourse.julialang.org/u/fer)\
**Replies:** 1\
**Last updated:** [May 30, 2019, 5:50pm UTC](https://discourse.julialang.org/t/beginner-numericalmath-use-trapz-routine-and-number-type/24777 "2019-05-30T17:50:17Z")

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It seems that NumericalMath.jl have some installation problems with julia 1.1.1 : here is my error message: \[ Info: Precompiling NumericalMath \[2d69212a-5df0-5a1f-8e4a-e8e814bdb11a\] ERROR: LoadError: LoadError: syntax: …

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## [Differential Equation Parameter Estimation Using Only A Subset of Variables](https://discourse.julialang.org/t/differential-equation-parameter-estimation-using-only-a-subset-of-variables/23423)

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**Author:** [@alewolf](https://discourse.julialang.org/u/alewolf)\
**Replies:** 32\
**Last updated:** [May 30, 2019, 3:52pm UTC](https://discourse.julialang.org/t/differential-equation-parameter-estimation-using-only-a-subset-of-variables/23423 "2019-05-30T15:52:34Z")

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Hi, I have a DAE problem with 37 variables - I only have data for 12 of those variables - I would like to run parameter estimation with an L2Loss function based only on the 12 variables for which I actually have data. …

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## [Efficient QR factorization](https://discourse.julialang.org/t/efficient-qr-factorization/24767)

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**Author:** [@raphaelsaavedra](https://discourse.julialang.org/u/raphaelsaavedra)\
**Replies:** 3\
**Last updated:** [May 30, 2019, 2:49pm UTC](https://discourse.julialang.org/t/efficient-qr-factorization/24767 "2019-05-30T14:49:52Z")

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Hello, I’m having some issues with QR factorization in Julia 1.0. I want to efficiently compute the QR factorization of the transpose of a matrix and save only Q. Back in 0.6, there were LAPACK functions that did this e…

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## [Shock Decompositions in Julia](https://discourse.julialang.org/t/shock-decompositions-in-julia/24761)

<div class="topic-metadata">

**Author:** [@nik.ltin](https://discourse.julialang.org/u/nik.ltin)\
**Replies:** 5\
**Last updated:** [May 30, 2019, 2:42pm UTC](https://discourse.julialang.org/t/shock-decompositions-in-julia/24761 "2019-05-30T14:42:57Z")

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Hello, I’m attempting to do historical cumulated shock decompositions in Julia similar to those done in Matlab’s Dynare (attached an example below). Not sure as to how to go about doing this? Using Plots.jl to match up e…

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## [Zygote load error on recent Julia version](https://discourse.julialang.org/t/zygote-load-error-on-recent-julia-version/24763)

<div class="topic-metadata">

**Author:** [@tanders](https://discourse.julialang.org/u/tanders)\
**Replies:** 2\
**Last updated:** [May 30, 2019, 12:34pm UTC](https://discourse.julialang.org/t/zygote-load-error-on-recent-julia-version/24763 "2019-05-30T12:34:11Z")

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Dear all, I am trying to use Zygote on a recent Julia installation, but ran into a load error. The details are reported at the link below. https://github.com/FluxML/Zygote.jl/issues/206 I am very new still to this fie…

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## [Approximating a Quadratic Function with Flux](https://discourse.julialang.org/t/approximating-a-quadratic-function-with-flux/24034)

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**Author:** [@mboutros](https://discourse.julialang.org/u/mboutros)\
**Replies:** 6\
**Last updated:** [May 30, 2019, 8:24am UTC](https://discourse.julialang.org/t/approximating-a-quadratic-function-with-flux/24034 "2019-05-30T08:24:57Z")

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I’m trying to get familiar with neural networks and Flux by estimating a series of simple models. First, I can successfully estimate a linear model using Flux: using Plots using Flux using Flux: @epochs gridsize = 100;…

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