# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1986

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 1987

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## [Error problem when installing some packages in Julia](https://discourse.julialang.org/t/error-problem-when-installing-some-packages-in-julia/24658)

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**Author:** [@GERSON\_EZEQUIEL\_HERN](https://discourse.julialang.org/u/GERSON_EZEQUIEL_HERN)\
**Replies:** 7\
**Last updated:** [May 30, 2019, 4:28pm UTC](https://discourse.julialang.org/t/error-problem-when-installing-some-packages-in-julia/24658 "2019-05-30T16:28:51Z")

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I’m trying to install some packages in Julia. But at the time of installation I see this error. ERROR: The following package names could not be resolved: ImageTracking (not found in project, manifest or registry) Ple…

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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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## [Inlining a function in a struct field](https://discourse.julialang.org/t/inlining-a-function-in-a-struct-field/24720)

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**Author:** [@Ferran\_Mazzanti](https://discourse.julialang.org/u/Ferran_Mazzanti)\
**Replies:** 16\
**Last updated:** [May 30, 2019, 3:00pm UTC](https://discourse.julialang.org/t/inlining-a-function-in-a-struct-field/24720 "2019-05-30T15:00:15Z")

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Hi, I have a question about inlining functions that hopefully somebody here can help me solve. I define an inlined potential function as follows @inline function V(x) 1.0/x^5 end; and also a user-defined type that…

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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)

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**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)

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**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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## [How to design LaTeX output?](https://discourse.julialang.org/t/how-to-design-latex-output/9451)

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**Author:** [@Jean\_Michel](https://discourse.julialang.org/u/Jean_Michel)\
**Replies:** 20\
**Last updated:** [May 30, 2019, 12:22pm UTC](https://discourse.julialang.org/t/how-to-design-latex-output/9451 "2019-05-30T12:22:12Z")

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I write this long message because I am perplexed about the output facilities in Julia, to the point that I have no idea how to proceed with my design. I want to write facilities for outputting in TeX/La…

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## [Switching out the underlying array in a SubArray](https://discourse.julialang.org/t/switching-out-the-underlying-array-in-a-subarray/24727)

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**Author:** [@FHell](https://discourse.julialang.org/u/FHell)\
**Replies:** 19\
**Last updated:** [May 30, 2019, 8:43am UTC](https://discourse.julialang.org/t/switching-out-the-underlying-array-in-a-subarray/24727 "2019-05-30T08:43:30Z")

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Hi everyone, I am developing a package for simulating (possibly very heterogeneous) dynamical systems that live on networks: It’s very early days but usable, we just pushed v0.1. The core of this package is a loop ov…

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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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## [\]dev a standard library package](https://discourse.julialang.org/t/dev-a-standard-library-package/24752)

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**Author:** [@gasagna](https://discourse.julialang.org/u/gasagna)\
**Replies:** 3\
**Last updated:** [May 30, 2019, 7:56am UTC](https://discourse.julialang.org/t/dev-a-standard-library-package/24752 "2019-05-30T07:56:38Z")

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I want to make some changes to my local install of SuiteSparse.jl and in the REPL I do \]dev SuiteSparse This create an image of the source code in ~/julia/dev/SuiteSparse that I can play with. However, importing the m…

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## [How to remove the bar strokeline in Plots.jl](https://discourse.julialang.org/t/how-to-remove-the-bar-strokeline-in-plots-jl/24753)

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**Author:** [@babaq](https://discourse.julialang.org/u/babaq)\
**Replies:** 3\
**Last updated:** [May 30, 2019, 6:25am UTC](https://discourse.julialang.org/t/how-to-remove-the-bar-strokeline-in-plots-jl/24753 "2019-05-30T06:25:03Z")

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Hi, I am trying to do a bar plot, with no gap between them, but I don’t know how to remove the black stroke lines around each bar. Anyone knows how to achieve this in Plots? Thanks

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## [Juno hot reload during development](https://discourse.julialang.org/t/juno-hot-reload-during-development/23347)

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**Author:** [@ravi\_soni](https://discourse.julialang.org/u/ravi_soni)\
**Replies:** 2\
**Last updated:** [May 30, 2019, 12:49am UTC](https://discourse.julialang.org/t/juno-hot-reload-during-development/23347 "2019-05-30T00:49:09Z")

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I am trying to hack on Juno by working through atom-julia-client. But I have to run atom -d or window:reload to see the changes. I couldn’t find anything related to hot reload in docs. Did I miss something or manual relo…

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## [Parametric subtyping, StackOverflowError issues](https://discourse.julialang.org/t/parametric-subtyping-stackoverflowerror-issues/24750)

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**Author:** [@tamasgal](https://discourse.julialang.org/u/tamasgal)\
**Replies:** 2\
**Last updated:** [May 29, 2019, 10:12pm UTC](https://discourse.julialang.org/t/parametric-subtyping-stackoverflowerror-issues/24750 "2019-05-29T22:12:36Z")

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I think I don’t do it right, although it works (more or less)… Given a using StaticArrays struct Position{T} \<: FieldVector{3, T} x::T y::T z::T end I can create and calculate nicely with the type: \> Posi…

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## [Block diagonal matrices](https://discourse.julialang.org/t/block-diagonal-matrices/24587)

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**Author:** [@cgeoga](https://discourse.julialang.org/u/cgeoga)\
**Replies:** 8\
**Last updated:** [May 29, 2019, 9:36pm UTC](https://discourse.julialang.org/t/block-diagonal-matrices/24587 "2019-05-29T21:36:35Z")

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Apologies if this has been discussed somewhere and I missed it in my searches, but I’m a bit confused by the behavior implemented for block diagonal matrices. For example, I note that if I did something like using Line…

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## [Normalized Laplacian with LightGraphs.jl](https://discourse.julialang.org/t/normalized-laplacian-with-lightgraphs-jl/24748)

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**Author:** [@andferrari](https://discourse.julialang.org/u/andferrari)\
**Replies:** 0\
**Last updated:** [May 29, 2019, 9:08pm UTC](https://discourse.julialang.org/t/normalized-laplacian-with-lightgraphs-jl/24748 "2019-05-29T21:08:00Z")

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I want to compute the Normalized Laplacian of a graph g. Is there something more straightforward than? adjmat = LightGraphs.LinAlg.CombinatorialAdjacency(adjacency\_matrix(g)) Ln = I - Diagonal(adjmat.D.^(-1/2))\*(adjmat…

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## [DynamicHMC: Reached maximum number of iterations](https://discourse.julialang.org/t/dynamichmc-reached-maximum-number-of-iterations/24721)

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**Author:** [@Christopher\_Fisher](https://discourse.julialang.org/u/Christopher_Fisher)\
**Replies:** 9\
**Last updated:** [May 29, 2019, 6:34pm UTC](https://discourse.julialang.org/t/dynamichmc-reached-maximum-number-of-iterations/24721 "2019-05-29T18:34:32Z")

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This is likely a question for Tamas. @goedman and I have encountered an error the following error with DynamicHMC: ERROR: Reached maximum number of iterations while bisecting interval for ϵ. The error occurs intermittent…

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## [Where is \`eigs()\` in Julia 1.0 version?](https://discourse.julialang.org/t/where-is-eigs-in-julia-1-0-version/24743)

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**Author:** [@Carol](https://discourse.julialang.org/u/Carol)\
**Replies:** 7\
**Last updated:** [May 29, 2019, 6:19pm UTC](https://discourse.julialang.org/t/where-is-eigs-in-julia-1-0-version/24743 "2019-05-29T18:19:31Z")

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Hi, I want to use eigs() to get the largest eigenvalue of a huge dense symmetric matrix.(50k by 50k) I can find eigs() in the documentation of Julia 0.6.4, but cannot find it in Julia 1.0.4 or 1.0.1. Could you please …

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## [\[ANN\] Juno 0.8.7](https://discourse.julialang.org/t/ann-juno-0-8-7/24682)

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**Author:** [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)\
**Replies:** 8\
**Last updated:** [May 29, 2019, 6:12pm UTC](https://discourse.julialang.org/t/ann-juno-0-8-7/24682 "2019-05-29T18:12:10Z")

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Hey folks, Juno 0.8.7 is out and brings an updated Debugger along with a few bugfixes and small features: Features Setting breakpoints in files does not require Revise anymore. Run in Compiled Mode toggle when debuggi…

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## [Special method for finding eigenvalues of a large sparse symmetric matrix?](https://discourse.julialang.org/t/special-method-for-finding-eigenvalues-of-a-large-sparse-symmetric-matrix/9621)

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**Author:** [@406700](https://discourse.julialang.org/u/406700)\
**Replies:** 17\
**Last updated:** [May 29, 2019, 5:50pm UTC](https://discourse.julialang.org/t/special-method-for-finding-eigenvalues-of-a-large-sparse-symmetric-matrix/9621 "2019-05-29T17:50:37Z")

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Hi, I am looking to solve the eigenvalues of sparse symmetric matrix of ~ 14000x14000. Eigfact is too slow, and didn’t give results after an hour running. (8gb ram i7 processor) Are there special iteritive methods? …

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## [Lifting a Julia function into a Flux "layer"](https://discourse.julialang.org/t/lifting-a-julia-function-into-a-flux-layer/13712)

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**Author:** [@cscherrer](https://discourse.julialang.org/u/cscherrer)\
**Replies:** 7\
**Last updated:** [May 29, 2019, 4:11pm UTC](https://discourse.julialang.org/t/lifting-a-julia-function-into-a-flux-layer/13712 "2019-05-29T16:11:11Z")

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Flux confused me for a long time. I got the first example in the docs to work: using Flux.Tracker W = param(rand(2, 5)) b = param(rand(2)) predict(x) = W\*x .+ b loss(x, y) = sum((predict(x) .- y).^2) x, y = rand(5), …

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## [Broadcasting and pairs using \`.=\>\`](https://discourse.julialang.org/t/broadcasting-and-pairs-using/24739)

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**Author:** [@j\_verzani](https://discourse.julialang.org/u/j_verzani)\
**Replies:** 3\
**Last updated:** [May 29, 2019, 4:06pm UTC](https://discourse.julialang.org/t/broadcasting-and-pairs-using/24739 "2019-05-29T16:06:08Z")

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In replace a pair is used to specify a pattern and its replacement, as in replace("123", "2" =\> "two"). When broadcasting, the following won’t work (as expected) as a pair is iterable: replace.(\["123", "246"\], "2"=\>"two"…

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## [Method dispatch - organization of code](https://discourse.julialang.org/t/method-dispatch-organization-of-code/24728)

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**Author:** [@Volker](https://discourse.julialang.org/u/Volker)\
**Replies:** 1\
**Last updated:** [May 29, 2019, 3:25pm UTC](https://discourse.julialang.org/t/method-dispatch-organization-of-code/24728 "2019-05-29T15:25:00Z")

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Hello, I´m working on a project were I have several dispatched methods. So that readability of my code of my module gets worse with every further dispatched method. I know that I could arrange the code in multiple files…

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## [How to use DifferentialEquations with complicated equations](https://discourse.julialang.org/t/how-to-use-differentialequations-with-complicated-equations/20740)

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**Author:** [@HelgavonLichtenstein](https://discourse.julialang.org/u/HelgavonLichtenstein)\
**Replies:** 19\
**Last updated:** [May 29, 2019, 2:36pm UTC](https://discourse.julialang.org/t/how-to-use-differentialequations-with-complicated-equations/20740 "2019-05-29T14:36:48Z")

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Hello, I understand the basic structure of DifferentialEquations but what if the equations you would like to use do not fit neatly like function lorenz(du,u,p,t) du\[1\] = 10.0\*(u\[2\]-u\[1\]) du\[2\] = u\[1\]\*(28.0-u\[3\]) - u\[…

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## [How to debug a non-deterministic StackOverflowError?](https://discourse.julialang.org/t/how-to-debug-a-non-deterministic-stackoverflowerror/24718)

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**Author:** [@jules](https://discourse.julialang.org/u/jules)\
**Replies:** 15\
**Last updated:** [May 29, 2019, 2:09pm UTC](https://discourse.julialang.org/t/how-to-debug-a-non-deterministic-stackoverflowerror/24718 "2019-05-29T14:09:42Z")

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I’m trying to implement the Rhea C++ constraint solving algorithm in Julia as a learning project. I’m simply translating the original source as far as I’m able into something that makes sense in Julia. I have implemente…

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## [Integer variable as index of input matrix](https://discourse.julialang.org/t/integer-variable-as-index-of-input-matrix/24725)

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**Author:** [@Raminel](https://discourse.julialang.org/u/Raminel)\
**Replies:** 2\
**Last updated:** [May 29, 2019, 2:08pm UTC](https://discourse.julialang.org/t/integer-variable-as-index-of-input-matrix/24725 "2019-05-29T14:08:14Z")

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Hi people, Can I formulate an expression in Julia and use an integer variable as an index of an input matrix? @variable(m, 1 \<= t\[1:3, 1:3\] \<= 8, Int) P = \[ 90 80 60 70 50 30 10 0\] for i = 1:3 for j = 1:3 M\[i,j\] =…

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## [Wher variable "j" is declared as local?](https://discourse.julialang.org/t/wher-variable-j-is-declared-as-local/24734)

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**Author:** [@programista](https://discourse.julialang.org/u/programista)\
**Replies:** 3\
**Last updated:** [May 29, 2019, 1:56pm UTC](https://discourse.julialang.org/t/wher-variable-j-is-declared-as-local/24734 "2019-05-29T13:56:01Z")

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julia\> function my\_fu() global j println(j) end my\_fu (generic function with 1 method) julia\> for j=1:3 global j my\_fu() end ERROR: syntax: variable "j" decla…

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## [IF...ELSEIF...ELSE performance](https://discourse.julialang.org/t/if-elseif-else-performance/24622)

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**Author:** [@drmartinrohde](https://discourse.julialang.org/u/drmartinrohde)\
**Replies:** 16\
**Last updated:** [May 29, 2019, 1:47pm UTC](https://discourse.julialang.org/t/if-elseif-else-performance/24622 "2019-05-29T13:47:06Z")

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I need to use an IF…ELSEIF…ELSE statement in a large loop and I therefore did the following test to find the fastest implementation. In the following code a random number between 0 and 5 is chosen. Based on this outcome,…

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## [Gaussian process in Julia](https://discourse.julialang.org/t/gaussian-process-in-julia/22900)

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**Author:** [@yusri-dh](https://discourse.julialang.org/u/yusri-dh)\
**Replies:** 13\
**Last updated:** [May 29, 2019, 1:33pm UTC](https://discourse.julialang.org/t/gaussian-process-in-julia/22900 "2019-05-29T13:33:29Z")

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Hello all, Julia newbie here. I am sorry I am not sure whether this is the right place to ask this question. If no I will delete it later. Is there any well-maintained package dedicated for gaussian process in Julia lik…

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## [Database Poll](https://discourse.julialang.org/t/database-poll/24715)

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**Author:** [@tk3369](https://discourse.julialang.org/u/tk3369)\
**Replies:** 1\
**Last updated:** [May 29, 2019, 12:49pm UTC](https://discourse.julialang.org/t/database-poll/24715 "2019-05-29T12:49:04Z")

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Given this high traffic topic about the state of database libraries, I think it may be time to run a quick poll. Are you interested in accessing database from Julia programs? poll What kind of databases do you need t…

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## [Reading/parsing .ab1 sequencing files](https://discourse.julialang.org/t/reading-parsing-ab1-sequencing-files/23555)

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**Author:** [@solf1re2](https://discourse.julialang.org/u/solf1re2)\
**Replies:** 10\
**Last updated:** [May 29, 2019, 12:42pm UTC](https://discourse.julialang.org/t/reading-parsing-ab1-sequencing-files/23555 "2019-05-29T12:42:27Z")

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Hi, We currently get some sequencing done on 96 well plates. The lab guys manually check the chromatograms (ab1) files for clean reads. But I was wondering if there was a julia package able to open and retrieve the info…

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