# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=570

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**Page:** 571

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## [Library for multi objective optimization NSGA II](https://discourse.julialang.org/t/library-for-multi-objective-optimization-nsga-ii/1247)

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**Author:** [@abhijeetpanda12](https://discourse.julialang.org/u/abhijeetpanda12)\
**Replies:** 4\
**Last updated:** [January 3, 2017, 2:34am UTC](https://discourse.julialang.org/t/library-for-multi-objective-optimization-nsga-ii/1247 "2017-01-03T02:34:12Z")

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Hello everyone, I have few queries, could you please help me out I wish to write a Julia library for solving multi-objective optimization problems using NSGA II. Presently I am working on this as a part of my research…

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## [ForwardDiff chunk size: for what kinds of problems does it make a large difference?](https://discourse.julialang.org/t/forwarddiff-chunk-size-for-what-kinds-of-problems-does-it-make-a-large-difference/1234)

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**Author:** [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Replies:** 3\
**Last updated:** [January 2, 2017, 2:48am UTC](https://discourse.julialang.org/t/forwarddiff-chunk-size-for-what-kinds-of-problems-does-it-make-a-large-difference/1234 "2017-01-02T02:48:55Z")

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How much have you guys noticed the chunk size mattering for ForwardDiff.jl timings? I don’t see anything more than like 2% of a timing difference in the functions I am testing on (I am testing it through NLsolve as well)…

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## [Join JuliaGraphics org?](https://discourse.julialang.org/t/join-juliagraphics-org/1235)

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**Author:** [@cormullion](https://discourse.julialang.org/u/cormullion)\
**Replies:** 3\
**Last updated:** [January 1, 2017, 1:04pm UTC](https://discourse.julialang.org/t/join-juliagraphics-org/1235 "2017-01-01T13:04:36Z")

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I’m thinking that I’d like to move the package Luxor.jl from my personal github to the JuliaGraphics organization. It complements some of the other packages in that org, and could be a useful alternative to Compose.jl an…

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## [ANN: MLLabelUtils.jl](https://discourse.julialang.org/t/ann-mllabelutils-jl/1233)

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**Author:** [@Evizero](https://discourse.julialang.org/u/Evizero)\
**Replies:** 0\
**Last updated:** [January 1, 2017, 2:33am UTC](https://discourse.julialang.org/t/ann-mllabelutils-jl/1233 "2017-01-01T02:33:11Z")

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Hello everyone and a happy new year! I am happy to announce a new JuliaML package for working with classification targets in various formats. It is not yet registered (so don’t believe the documentation!), but I will cr…

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## [Hist() and hits() in Julia?](https://discourse.julialang.org/t/hist-and-hits-in-julia/1224)

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**Author:** [@mgiugliano](https://discourse.julialang.org/u/mgiugliano)\
**Replies:** 2\
**Last updated:** [December 30, 2016, 11:45pm UTC](https://discourse.julialang.org/t/hist-and-hits-in-julia/1224 "2016-12-30T23:45:26Z")

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Given a set of elements, I would love to efficiently partition their numerical values into bins, and then return the count in each bin, as well as the bin edges. MATLAB used to have super simple functions for this (i.e.…

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## [QR factorization with custom dot product](https://discourse.julialang.org/t/qr-factorization-with-custom-dot-product/1208)

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**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 5\
**Last updated:** [December 30, 2016, 9:42pm UTC](https://discourse.julialang.org/t/qr-factorization-with-custom-dot-product/1208 "2016-12-30T21:42:09Z")

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Is there a way of passing a custom dot product to the QR factorization routine? In my application, the column vectors are the coefficients of a basis of continuous functions and the dot product is the integral over a vol…

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## [Just added AnyChart JS Charts integration template for data visualization with Julia and MySQL](https://discourse.julialang.org/t/just-added-anychart-js-charts-integration-template-for-data-visualization-with-julia-and-mysql/1202)

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**Author:** [@andreykh](https://discourse.julialang.org/u/andreykh)\
**Replies:** 2\
**Last updated:** [December 30, 2016, 7:55am UTC](https://discourse.julialang.org/t/just-added-anychart-js-charts-integration-template-for-data-visualization-with-julia-and-mysql/1202 "2016-12-30T07:55:27Z")

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We at AnyChart JS Charts have just released a series of 20+ integration templates to help web developers add interactive charts, maps and dashboards to HTML5 apps faster with various popular technology stacks. In partic…

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## [Implementing Low rank update of block-LDLᵀ decomposition in Julia](https://discourse.julialang.org/t/implementing-low-rank-update-of-block-ldl-decomposition-in-julia/1207)

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**Author:** [@pushpendre\_rastogi](https://discourse.julialang.org/u/pushpendre_rastogi)\
**Replies:** 0\
**Last updated:** [December 29, 2016, 7:31pm UTC](https://discourse.julialang.org/t/implementing-low-rank-update-of-block-ldl-decomposition-in-julia/1207 "2016-12-29T19:31:20Z")

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Hi, I was wondering if any one has implemented stable algorithms for efficiently updating the block-LDLᵀ decomposition of symmetric indefinite matrices in Julia? I know that the dsytf2\* functions in LAPACK compute the d…

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## [Plotting of heatmap colorbar in Plots.jl](https://discourse.julialang.org/t/plotting-of-heatmap-colorbar-in-plots-jl/1199)

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**Author:** [@bkamins](https://discourse.julialang.org/u/bkamins)\
**Replies:** 0\
**Last updated:** [December 29, 2016, 12:20pm UTC](https://discourse.julialang.org/t/plotting-of-heatmap-colorbar-in-plots-jl/1199 "2016-12-29T12:20:34Z")

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I have the following code: using Plots pyplot() heatmap(1:2, 1:2, eye(2), colorbar=false) plotly() heatmap(1:2, 1:2, eye(2), colorbar=false) Under pyplot colorbar is not drawn (as expected). However, I am unable to di…

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## [Announcement: JuMP 0.15 released](https://discourse.julialang.org/t/announcement-jump-0-15-released/1108)

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**Author:** [@miles.lubin](https://discourse.julialang.org/u/miles.lubin)\
**Replies:** 1\
**Last updated:** [December 29, 2016, 6:03am UTC](https://discourse.julialang.org/t/announcement-jump-0-15-released/1108 "2016-12-29T06:03:33Z")

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Just in time for Hanukkah, we’re pleased to announce the release of JuMP 0.15. Most visibly, this release deprecates the use of the curly-brace syntax sum{}, prod{}, and norm2{} in favor of the new generator syntax (sum…

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## [Upcoming breaking change in JuMP with user-defined functions](https://discourse.julialang.org/t/upcoming-breaking-change-in-jump-with-user-defined-functions/1191)

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**Author:** [@miles.lubin](https://discourse.julialang.org/u/miles.lubin)\
**Replies:** 2\
**Last updated:** [December 29, 2016, 4:03am UTC](https://discourse.julialang.org/t/upcoming-breaking-change-in-jump-with-user-defined-functions/1191 "2016-12-29T04:03:19Z")

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I’d like to let everyone know about an upcoming breaking change in how JuMP deals with user-defined functions. Previously, functions registered using JuMP.register were global in scope, making them complicated to deal wi…

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## [Cannot build Rational{Poly}](https://discourse.julialang.org/t/cannot-build-rational-poly/1119)

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**Author:** [@MA\_Laforge](https://discourse.julialang.org/u/MA_Laforge)\
**Replies:** 5\
**Last updated:** [December 24, 2016, 7:16pm UTC](https://discourse.julialang.org/t/cannot-build-rational-poly/1119 "2016-12-24T19:16:17Z")

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Hi, I tried creating a polynomial ratio: using Polynomials julia\> a=Rational{Poly}(Poly(\[1,2\]),Poly(\[3\])) , but got the following error: ERROR: TypeError: Rational: in T, expected T\<:Integer, got Type{Polynomials.Po…

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## [JuMP - NLopt - How to set local optimizer](https://discourse.julialang.org/t/jump-nlopt-how-to-set-local-optimizer/1053)

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**Author:** [@holger](https://discourse.julialang.org/u/holger)\
**Replies:** 1\
**Last updated:** [December 22, 2016, 7:46pm UTC](https://discourse.julialang.org/t/jump-nlopt-how-to-set-local-optimizer/1053 "2016-12-22T19:46:21Z")

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I am formulating an NLP in JuMP and would like to try out different solvers using NLopt. Some of them require setting a local optimization algorithm. How do I do that in JuMP? To be more specific, say I have: m = Model…

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## [PyPlot versus GR scatter plot appearance](https://discourse.julialang.org/t/pyplot-versus-gr-scatter-plot-appearance/1061)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 19\
**Last updated:** [December 22, 2016, 3:50pm UTC](https://discourse.julialang.org/t/pyplot-versus-gr-scatter-plot-appearance/1061 "2016-12-22T15:50:29Z")

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I have some million points to plot in 3D and would like to use the GR backend of Plots.jl to speedup exploration. The PyPlot backend gives me a desirable output: but all the details are missing with GR: Is there …

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## [Update visualizations in compose.jl without redrawing everything? ...transitions?](https://discourse.julialang.org/t/update-visualizations-in-compose-jl-without-redrawing-everything-transitions/1068)

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**Author:** [@TravisA9](https://discourse.julialang.org/u/TravisA9)\
**Replies:** 4\
**Last updated:** [December 21, 2016, 6:15pm UTC](https://discourse.julialang.org/t/update-visualizations-in-compose-jl-without-redrawing-everything-transitions/1068 "2016-12-21T18:15:19Z")

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Been learning to use ComposeJl and it’s very cool. I would really love to see more extensive documentation though. I have been figuring a few things out by digging through the code. I am testing Compose out in an applica…

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## [BoltzmannMachines.jl](https://discourse.julialang.org/t/boltzmannmachines-jl/1060)

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**Author:** [@binderh](https://discourse.julialang.org/u/binderh)\
**Replies:** 8\
**Last updated:** [December 21, 2016, 2:29pm UTC](https://discourse.julialang.org/t/boltzmannmachines-jl/1060 "2016-12-21T14:29:01Z")

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Hi everybody, We just put our package BoltzmannMachines.jl online. It provides a specific type of Deep Learning approach, which isn’t covered by typical Deep Learning packages, but nevertheless rather successful in appl…

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## [ProximalOperators.jl](https://discourse.julialang.org/t/proximaloperators-jl/1064)

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**Author:** [@lostella](https://discourse.julialang.org/u/lostella)\
**Replies:** 2\
**Last updated:** [December 21, 2016, 12:43pm UTC](https://discourse.julialang.org/t/proximaloperators-jl/1064 "2016-12-21T12:43:34Z")

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Hi all, We registered our package ProximalOperators.jl, containing the implementation of the proximal mapping associated with several convex and nonconvex penalty functions, indicator functions and so on. This can be us…

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## [Salsa machine learning test](https://discourse.julialang.org/t/salsa-machine-learning-test/1085)

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**Author:** [@Mohan\_Rao](https://discourse.julialang.org/u/Mohan_Rao)\
**Replies:** 0\
**Last updated:** [December 21, 2016, 8:43am UTC](https://discourse.julialang.org/t/salsa-machine-learning-test/1085 "2016-12-21T08:43:42Z")

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Hi, I am interested in ML using SALSA and ran it on iris data successfully. However, how do I interpret its output and do a test case. If it learnt the lengths of sepals & petals for each of classes then how do I inpu…

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## [Pkg.upgrade() of JuMP/MathProgBase](https://discourse.julialang.org/t/pkg-upgrade-of-jump-mathprogbase/1044)

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**Author:** [@monty](https://discourse.julialang.org/u/monty)\
**Replies:** 2\
**Last updated:** [December 20, 2016, 10:21pm UTC](https://discourse.julialang.org/t/pkg-upgrade-of-jump-mathprogbase/1044 "2016-12-20T22:21:04Z")

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I did Pkg.checkout() of JuMP/MathProgBase to get the latest versions. However, Pkg.upgrade() is downgrading JuMP/MathProgBase to old versions. I am using julia 0.5. How to resolve this?

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## [Re-position plot labels in subplot grid in Gadfly](https://discourse.julialang.org/t/re-position-plot-labels-in-subplot-grid-in-gadfly/793)

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**Author:** [@Christopher\_Fisher](https://discourse.julialang.org/u/Christopher_Fisher)\
**Replies:** 1\
**Last updated:** [December 19, 2016, 10:31am UTC](https://discourse.julialang.org/t/re-position-plot-labels-in-subplot-grid-in-gadfly/793 "2016-12-19T10:31:37Z")

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Hi all- I have two plots vertically stacked with subgrid plot in Gadfly. Each plot is labeled on the y axis (e.g. Plot1, Plot2) along with the y variable. Is it possible to put the labels either above or below each plot…

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## [ODBC.jl WeakRefString{Int32} error](https://discourse.julialang.org/t/odbc-jl-weakrefstring-int32-error/1033)

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**Author:** [@msravi](https://discourse.julialang.org/u/msravi)\
**Replies:** 0\
**Last updated:** [December 19, 2016, 7:46am UTC](https://discourse.julialang.org/t/odbc-jl-weakrefstring-int32-error/1033 "2016-12-19T07:46:44Z")

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Hi, I have two tables in a mysql database whose schema are basically identical (see schema at the end). When I attempt to query the first one using ODBC.jl, there is no problem, and data is returned as expected. However…

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## [How to put the legend outside of the plot area in Plots?](https://discourse.julialang.org/t/how-to-put-the-legend-outside-of-the-plot-area-in-plots/1027)

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**Author:** [@Ali\_Vahdati](https://discourse.julialang.org/u/Ali_Vahdati)\
**Replies:** 0\
**Last updated:** [December 18, 2016, 5:42pm UTC](https://discourse.julialang.org/t/how-to-put-the-legend-outside-of-the-plot-area-in-plots/1027 "2016-12-18T17:42:42Z")

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In PyPlot, we can use bbox\_to\_anchor option. What is an equivalent in Plots?

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## [Why isn't the default directory of savefig() the folder where the file is?](https://discourse.julialang.org/t/why-isnt-the-default-directory-of-savefig-the-folder-where-the-file-is/847)

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**Author:** [@chobbes](https://discourse.julialang.org/u/chobbes)\
**Replies:** 18\
**Last updated:** [December 17, 2016, 3:20pm UTC](https://discourse.julialang.org/t/why-isnt-the-default-directory-of-savefig-the-folder-where-the-file-is/847 "2016-12-17T15:20:21Z")

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Hello, I expected the default directory for saving a figure is the same folder where the file is and found that this is not the case. So I have to specify a directory each time and it’s not very convenient for other use…

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## [Gurobi.jl precompile fails after upgrade](https://discourse.julialang.org/t/gurobi-jl-precompile-fails-after-upgrade/990)

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**Author:** [@jesse](https://discourse.julialang.org/u/jesse)\
**Replies:** 10\
**Last updated:** [December 17, 2016, 2:38pm UTC](https://discourse.julialang.org/t/gurobi-jl-precompile-fails-after-upgrade/990 "2016-12-17T14:38:56Z")

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Hi! My worst fear got realized when I upgraded my Julia installation to the newest version: julia\> versioninfo() Julia Version 0.6.0-dev.1562 Commit 3037157 (2016-12-14 07:11 UTC) Platform Info: OS: Linux (x86\_64-lin…

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## [Lazy constraints : loop does not stop while they are satisfied](https://discourse.julialang.org/t/lazy-constraints-loop-does-not-stop-while-they-are-satisfied/957)

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**Author:** [@copti](https://discourse.julialang.org/u/copti)\
**Replies:** 3\
**Last updated:** [December 15, 2016, 1:30pm UTC](https://discourse.julialang.org/t/lazy-constraints-loop-does-not-stop-while-they-are-satisfied/957 "2016-12-15T13:30:59Z")

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Hello ! I am getting troubles using lazy constriants for solving a MILP (using Gurobi). My code is structured as follows : (here are some parts of it) # Extract from the code : using JuMP using Gurobi m = Model(sol…

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## [Optim.jl very slow](https://discourse.julialang.org/t/optim-jl-very-slow/941)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 12\
**Last updated:** [December 15, 2016, 3:27am UTC](https://discourse.julialang.org/t/optim-jl-very-slow/941 "2016-12-15T03:27:18Z")

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I have a convex objective function that I want to minimize (unconstrained). It depends ~ 200 variables. I’m running Optim on it, but it takes forever (has been computing for a full day now). I want to improve the perfor…

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## [BioArgParse.jl](https://discourse.julialang.org/t/bioargparse-jl/959)

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**Author:** [@Ward9250](https://discourse.julialang.org/u/Ward9250)\
**Replies:** 0\
**Last updated:** [December 14, 2016, 11:54pm UTC](https://discourse.julialang.org/t/bioargparse-jl/959 "2016-12-14T23:54:32Z")

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I’ve been making scripts/packages with BioJulia packages which read in command line arguments, and I had to write some custom functions to take strings from command line and make Bio.jl types. Well, I’m lazy, ArgParse.jl…

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## [Block-triangular-form permutation?](https://discourse.julialang.org/t/block-triangular-form-permutation/818)

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**Author:** [@stustd](https://discourse.julialang.org/u/stustd)\
**Replies:** 2\
**Last updated:** [December 14, 2016, 10:02am UTC](https://discourse.julialang.org/t/block-triangular-form-permutation/818 "2016-12-14T10:02:30Z")

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Is there a function that permutes a sparse matrix (or its incidence graph) into block triangular form (BTF)?

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## [Column reordering of Cholesky using Givens rotations](https://discourse.julialang.org/t/column-reordering-of-cholesky-using-givens-rotations/323)

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**Author:** [@dmbates](https://discourse.julialang.org/u/dmbates)\
**Replies:** 3\
**Last updated:** [December 13, 2016, 10:00pm UTC](https://discourse.julialang.org/t/column-reordering-of-cholesky-using-givens-rotations/323 "2016-12-13T22:00:10Z")

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Linpack, the predecessor of LAPACK, provided update/downdate functions for Cholesky decompositions (dchud, dchdd) as well as a function, dchex, to restore a Cholesky factor to triangular form after a left or right circul…

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## [New package: ForecastEval](https://discourse.julialang.org/t/new-package-forecasteval/774)

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**Author:** [@colintbowers](https://discourse.julialang.org/u/colintbowers)\
**Replies:** 0\
**Last updated:** [December 7, 2016, 5:03am UTC](https://discourse.julialang.org/t/new-package-forecasteval/774 "2016-12-07T05:03:16Z")

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I’ve just published a new package, ForecastEval, to the official METADATA. The package implements several of the statistical tests from the forecast evaluation literature including: Diebold, Mariano (1995) “Comparing P…

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