# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=559

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

**Page:** 560

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## [CSV parsing performance](https://discourse.julialang.org/t/csv-parsing-performance/4619)

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**Author:** [@davidanthoff](https://discourse.julialang.org/u/davidanthoff)\
**Replies:** 4\
**Last updated:** [July 4, 2017, 6:55am UTC](https://discourse.julialang.org/t/csv-parsing-performance/4619 "2017-07-04T06:55:27Z")

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I’m playing around with CSV parsers right now (CSV.jl and TextParse.jl), trying to figure out which one is faster. @quinnj showed some impressive performance numbers in his juliacon talk that indicated CSV.jl is really g…

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## [Levenberg-Marquardt in Optim.jl 0.9.0](https://discourse.julialang.org/t/levenberg-marquardt-in-optim-jl-0-9-0/4565)

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**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 4\
**Last updated:** [July 4, 2017, 4:41am UTC](https://discourse.julialang.org/t/levenberg-marquardt-in-optim-jl-0-9-0/4565 "2017-07-04T04:41:38Z")

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I am trying to fix this mexjulia example and I cannot figure out what to replace levenberg\_marquardt with. In particular, levenberg\_marquardt returns a vector of residuals of length m but as far as I can see, all of the …

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## [High dual infeasibilities in IPOPT lead to convergence issues](https://discourse.julialang.org/t/high-dual-infeasibilities-in-ipopt-lead-to-convergence-issues/1687)

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**Author:** [@huckl3b3rry87](https://discourse.julialang.org/u/huckl3b3rry87)\
**Replies:** 6\
**Last updated:** [July 3, 2017, 11:22pm UTC](https://discourse.julialang.org/t/high-dual-infeasibilities-in-ipopt-lead-to-convergence-issues/1687 "2017-07-03T23:22:08Z")

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I am using JuMP.jl to develop NLOptControl.jl to solve optimal control problems and I have dealt with an IPOPT issue for some time now, where the dual infeasibility of my constraints are very high and eventually the prob…

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## [Simple "coin" example will not work with JuMP + Gurobi](https://discourse.julialang.org/t/simple-coin-example-will-not-work-with-jump-gurobi/4629)

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**Author:** [@mbeltagy](https://discourse.julialang.org/u/mbeltagy)\
**Replies:** 1\
**Last updated:** [July 3, 2017, 9:03pm UTC](https://discourse.julialang.org/t/simple-coin-example-will-not-work-with-jump-gurobi/4629 "2017-07-03T21:03:38Z")

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This model is a simple introductory example in Gurobi, that seems unsolvable with JuMP + Gurobi The model itself is typical found in a Gurobi installation at /opt/gurobi702/linux64/examples/data/coins.lp. Running gurob…

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## [Mosek, different behavior after upgrade](https://discourse.julialang.org/t/mosek-different-behavior-after-upgrade/4613)

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**Author:** [@mauro](https://discourse.julialang.org/u/mauro)\
**Replies:** 2\
**Last updated:** [July 3, 2017, 8:59pm UTC](https://discourse.julialang.org/t/mosek-different-behavior-after-upgrade/4613 "2017-07-03T20:59:40Z")

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Hello everyone, I upgraded today from Julia 0.5.1 to 0.6. Doing so I ended up with the following behavior of Mosek (v.0.7.0) and JuMP (v.0.17.1): the example is using JuMP, Mosek m = Model(solver=MosekSolver()) @vari…

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## [Using FileIO/MeshIO to save a HomogenousMesh](https://discourse.julialang.org/t/using-fileio-meshio-to-save-a-homogenousmesh/4594)

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**Author:** [@mohamed82008](https://discourse.julialang.org/u/mohamed82008)\
**Replies:** 4\
**Last updated:** [July 3, 2017, 1:57am UTC](https://discourse.julialang.org/t/using-fileio-meshio-to-save-a-homogenousmesh/4594 "2017-07-03T01:57:17Z")

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I wasn’t able to find a documented function in FileIO or MeshIO that takes in a file name and a HomogenousMesh and writes an obj, ply or svg file. After some digging, I found the following function which simply crashes J…

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## [Elastoplasticity from SIGGRAPH 2017](https://discourse.julialang.org/t/elastoplasticity-from-siggraph-2017/4584)

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**Author:** [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Replies:** 2\
**Last updated:** [July 1, 2017, 8:03pm UTC](https://discourse.julialang.org/t/elastoplasticity-from-siggraph-2017/4584 "2017-07-01T20:03:09Z")

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kinda wonderful to see that this is become technique. While not veridical, to my eye it is real-adjacent. Here is the video. Here is the paper. \[much of the math may be well covered by Julia packages\] exerpted from …

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## [Help modeling a problem in Julia using JuMP (stock problem)](https://discourse.julialang.org/t/help-modeling-a-problem-in-julia-using-jump-stock-problem/4549)

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**Author:** [@gbaesso](https://discourse.julialang.org/u/gbaesso)\
**Replies:** 6\
**Last updated:** [June 30, 2017, 11:13pm UTC](https://discourse.julialang.org/t/help-modeling-a-problem-in-julia-using-jump-stock-problem/4549 "2017-06-30T23:13:39Z")

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Hello everyone, I’m new to Julia, and I´m helping my wife with her Master degree. Unfortunately, we both lack a solid mathematical foundation, and that´s really making things more difficult for me. I have started with …

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## [Query.jl: Selection using Base functions and possibly missing values](https://discourse.julialang.org/t/query-jl-selection-using-base-functions-and-possibly-missing-values/4557)

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**Author:** [@tcovert](https://discourse.julialang.org/u/tcovert)\
**Replies:** 3\
**Last updated:** [June 30, 2017, 7:16am UTC](https://discourse.julialang.org/t/query-jl-selection-using-base-functions-and-possibly-missing-values/4557 "2017-06-30T07:16:51Z")

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Suppose I have a DataFrame with two fields: idx and date. The date field has missing values (in the DataFrames sense) and is currently stored in the DataFrame as a string. Is there a query statement that I can write wh…

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## [Comparison involving variables with JuMP](https://discourse.julialang.org/t/comparison-involving-variables-with-jump/4551)

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**Author:** [@kguo](https://discourse.julialang.org/u/kguo)\
**Replies:** 2\
**Last updated:** [June 29, 2017, 8:29pm UTC](https://discourse.julialang.org/t/comparison-involving-variables-with-jump/4551 "2017-06-29T20:29:56Z")

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I am new to Julia/JuMP. Is it possible to perform comparison on variable. For example, is there something close to the following? maximum(M\[1,:\]. \* myFunction(x)) M is a nxn matrix and x is a variable. If not, what’…

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## [Creating a color map legend from a lookup table](https://discourse.julialang.org/t/creating-a-color-map-legend-from-a-lookup-table/4461)

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**Author:** [@mohamed82008](https://discourse.julialang.org/u/mohamed82008)\
**Replies:** 7\
**Last updated:** [June 28, 2017, 8:18pm UTC](https://discourse.julialang.org/t/creating-a-color-map-legend-from-a-lookup-table/4461 "2017-06-28T20:18:29Z")

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I would like to create a color map legend that shows the value associated with each color displayed in another drawing. Let’s say I have the scalar to color mapping, is there an off-the-shelf function in Julia to draw so…

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## [Installation of Mosek.jl fails on Julia v0.5.2](https://discourse.julialang.org/t/installation-of-mosek-jl-fails-on-julia-v0-5-2/4498)

<div class="topic-metadata">

**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 2\
**Last updated:** [June 28, 2017, 11:13am UTC](https://discourse.julialang.org/t/installation-of-mosek-jl-fails-on-julia-v0-5-2/4498 "2017-06-28T11:13:06Z")

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I cannot install Mosek.jl on a Windows 7 64 bit under Julia v0.5.2. I have downloaded and installed Mosek 8.0, mosek.exe is on the PATH and ENV contains the following keys: "MOSEK\_8\_0\_BINDIR" =\> "C:\\\\Program File…

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## [DifferentialEquations.jl: Problems with event detection](https://discourse.julialang.org/t/differentialequations-jl-problems-with-event-detection/4462)

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**Author:** [@helgee](https://discourse.julialang.org/u/helgee)\
**Replies:** 2\
**Last updated:** [June 26, 2017, 8:25am UTC](https://discourse.julialang.org/t/differentialequations-jl-problems-with-event-detection/4462 "2017-06-26T08:25:56Z")

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Hi folks, I am having problems getting event detection to work properly in DifferentialEquations.jl. I have reduced the code as far as possible: using DifferentialEquations using PyPlot function evaluate!(t, y, δy) …

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## [Unsure about Query error](https://discourse.julialang.org/t/unsure-about-query-error/4432)

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**Author:** [@zorp](https://discourse.julialang.org/u/zorp)\
**Replies:** 2\
**Last updated:** [June 23, 2017, 10:00pm UTC](https://discourse.julialang.org/t/unsure-about-query-error/4432 "2017-06-23T22:00:06Z")

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I’ve started learning Julia today and have been trying to use it to work on some botany questions that I’ve been thinking about for a time now. I’ve stored two CSVs relevant to the problems in variables (which are DataFr…

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## [Passing an array of variables to a user-defined non-linear function](https://discourse.julialang.org/t/passing-an-array-of-variables-to-a-user-defined-non-linear-function/4132)

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**Author:** [@axsk](https://discourse.julialang.org/u/axsk)\
**Replies:** 11\
**Last updated:** [June 23, 2017, 4:15pm UTC](https://discourse.julialang.org/t/passing-an-array-of-variables-to-a-user-defined-non-linear-function/4132 "2017-06-23T16:15:03Z")

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I am trying to optimize a multivariate function with JuMP, but can’t find a way to pass the arguments. The current code is: using JuMP …

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## [Querying the coefficient of a variable in a constraint](https://discourse.julialang.org/t/querying-the-coefficient-of-a-variable-in-a-constraint/4236)

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**Author:** [@Amulya\_Yadav](https://discourse.julialang.org/u/Amulya_Yadav)\
**Replies:** 1\
**Last updated:** [June 22, 2017, 6:30pm UTC](https://discourse.julialang.org/t/querying-the-coefficient-of-a-variable-in-a-constraint/4236 "2017-06-22T18:30:31Z")

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Hi, I have built a model using JuMP. Now, I want to be able to get the A matrix for my constraints (i.e., the coefficient matrix in Ax\<b if my problem is represented in standard form. Is there any way to get this matrix…

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## [Help Couenne error when specifying non-linear warehouse location problem](https://discourse.julialang.org/t/help-couenne-error-when-specifying-non-linear-warehouse-location-problem/4403)

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**Author:** [@prescient](https://discourse.julialang.org/u/prescient)\
**Replies:** 2\
**Last updated:** [June 22, 2017, 3:52pm UTC](https://discourse.julialang.org/t/help-couenne-error-when-specifying-non-linear-warehouse-location-problem/4403 "2017-06-22T15:52:32Z")

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I’m trying to specify a warehouse location problem that allows the optimizer to pick the warehouse locations rather than provide candidate locations. The problem is (1) when trying to register a function and solve the pr…

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## [Converting an animation from GR to Plots](https://discourse.julialang.org/t/converting-an-animation-from-gr-to-plots/4131)

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**Author:** [@martindemello](https://discourse.julialang.org/u/martindemello)\
**Replies:** 1\
**Last updated:** [June 20, 2017, 9:36pm UTC](https://discourse.julialang.org/t/converting-an-animation-from-gr-to-plots/4131 "2017-06-20T21:36:24Z")

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I’m trying to figure out animations in Plots.jl. I started off by porting a double pendulum simulation from the GR examples \[https://github.com/jheinen/gr/blob/master/examples/double\_pendulum.py\], refactored a bit so it …

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## [AbstractFloat math (Is anybody already doing this?)](https://discourse.julialang.org/t/abstractfloat-math-is-anybody-already-doing-this/4363)

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**Author:** [@Per](https://discourse.julialang.org/u/Per)\
**Replies:** 4\
**Last updated:** [June 20, 2017, 2:59pm UTC](https://discourse.julialang.org/t/abstractfloat-math-is-anybody-already-doing-this/4363 "2017-06-20T14:59:44Z")

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I’m planning an open-source (MIT license) project to do in my spare time, but I thought it might be a good idea to check with the community first, in case anybody is already doing something similar. My idea is to write …

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## [Extending MathProgBase to support complementarity constraints](https://discourse.julialang.org/t/extending-mathprogbase-to-support-complementarity-constraints/3995)

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**Author:** [@adowling2](https://discourse.julialang.org/u/adowling2)\
**Replies:** 2\
**Last updated:** [May 30, 2017, 9:29pm UTC](https://discourse.julialang.org/t/extending-mathprogbase-to-support-complementarity-constraints/3995 "2017-05-30T21:29:14Z")

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A few of us at Wisconsin are very interested in extending the abstraction in MathProgBase (MPB) to support complementarity constraints. The package https://github.com/chkwon/Complementarity.jl offers a nice way to model …

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## [Rigorous global optimisation: First release of \`IntervalOptimisation.jl\`](https://discourse.julialang.org/t/rigorous-global-optimisation-first-release-of-intervaloptimisation-jl/4336)

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**Author:** [@dpsanders](https://discourse.julialang.org/u/dpsanders)\
**Replies:** 5\
**Last updated:** [June 18, 2017, 10:21pm UTC](https://discourse.julialang.org/t/rigorous-global-optimisation-first-release-of-intervaloptimisation-jl/4336 "2017-06-18T22:21:23Z")

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I am excited to announce the first release of the \[IntervalOptimisation.jl\] (https://github.com/JuliaIntervals/IntervalOptimisation.jl) package, which performs (box-constrained) global optimisation for functions, includi…

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## [How to generate solution file?](https://discourse.julialang.org/t/how-to-generate-solution-file/4266)

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**Author:** [@gopal2017](https://discourse.julialang.org/u/gopal2017)\
**Replies:** 10\
**Last updated:** [June 18, 2017, 3:20pm UTC](https://discourse.julialang.org/t/how-to-generate-solution-file/4266 "2017-06-18T15:20:26Z")

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Hello, I am using Cbc solver. I used the code mentioned below to generate .sol file at particular location: m=Model(solver=CbcSolver(ResultFile=“E:/SolverFuncSolution.sol”) It is generating .sol file but it is not sol…

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## [Help rewriting Convex.jl problem in JuMP.jl](https://discourse.julialang.org/t/help-rewriting-convex-jl-problem-in-jump-jl/4321)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 8\
**Last updated:** [June 18, 2017, 5:24am UTC](https://discourse.julialang.org/t/help-rewriting-convex-jl-problem-in-jump-jl/4321 "2017-06-18T05:24:33Z")

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I am having a hard time trying to translate a convex optimization problem from Convex.jl to JuMP.jl: using Convex, ECOS # generate some data n = 100 e = \[sin(50i)\*sin(50j) for i=1:n, j=1:n\] # optimization variable h =…

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## [You may currently need to call backends explicitly when using Plots](https://discourse.julialang.org/t/you-may-currently-need-to-call-backends-explicitly-when-using-plots/4302)

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**Author:** [@mkborregaard](https://discourse.julialang.org/u/mkborregaard)\
**Replies:** 0\
**Last updated:** [June 16, 2017, 12:07pm UTC](https://discourse.julialang.org/t/you-may-currently-need-to-call-backends-explicitly-when-using-plots/4302 "2017-06-16T12:07:55Z")

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Not sure where to put this package-specific announcement, but I figured it would save some people a headache to make it visible. Since the change to 0.6 there is a persistent issue with world age in Plots, particularly …

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## [\[ANN\] NOAAData.jl - Access NOAA Climate Daily & Monthly Data](https://discourse.julialang.org/t/ann-noaadata-jl-access-noaa-climate-daily-monthly-data/4288)

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**Author:** [@pazzo83](https://discourse.julialang.org/u/pazzo83)\
**Replies:** 0\
**Last updated:** [June 15, 2017, 4:02pm UTC](https://discourse.julialang.org/t/ann-noaadata-jl-access-noaa-climate-daily-monthly-data/4288 "2017-06-15T16:02:36Z")

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Just wanted to announce a small package I just released that wraps the NOAA climate API (Web Services API (version 2) Documentation | Climate Data Online (CDO) | National Climatic Data Center (NCDC)) called NOAAData.jl. …

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## [Heatmap of a dataframe](https://discourse.julialang.org/t/heatmap-of-a-dataframe/4272)

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**Author:** [@ko56](https://discourse.julialang.org/u/ko56)\
**Replies:** 12\
**Last updated:** [June 15, 2017, 5:43am UTC](https://discourse.julialang.org/t/heatmap-of-a-dataframe/4272 "2017-06-15T05:43:29Z")

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It seems that StatPlots doesn’t support making a heatmap of an all-numeric dataframe. Would that be a reasonable addition to the package?

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## [Board Game interface which library?](https://discourse.julialang.org/t/board-game-interface-which-library/4221)

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**Author:** [@Foolius](https://discourse.julialang.org/u/Foolius)\
**Replies:** 7\
**Last updated:** [June 14, 2017, 8:35pm UTC](https://discourse.julialang.org/t/board-game-interface-which-library/4221 "2017-06-14T20:35:14Z")

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I wan to program some kind of board game but I don’t know how to do the graphics. I want some simple mechanic to show unicode symbols at 2d-coordinates and process mouse and keyboard events. What I found so far are wrap…

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## [Creating a macro for defining differential equation constraints in NLOptControl.jl](https://discourse.julialang.org/t/creating-a-macro-for-defining-differential-equation-constraints-in-nloptcontrol-jl/4023)

<div class="topic-metadata">

**Author:** [@huckl3b3rry87](https://discourse.julialang.org/u/huckl3b3rry87)\
**Replies:** 11\
**Last updated:** [June 14, 2017, 5:34pm UTC](https://discourse.julialang.org/t/creating-a-macro-for-defining-differential-equation-constraints-in-nloptcontrol-jl/4023 "2017-06-14T17:34:02Z")

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@miles.lubin please correct me if I am wrong, but from what I understand from the docs and our previous discussions, JuMP.jl does not allow the user to programmatically create variables and use ReverseDiffSparse.jl. To …

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## [How to get rid of scientific format numbers with Plots+pgfplots](https://discourse.julialang.org/t/how-to-get-rid-of-scientific-format-numbers-with-plots-pgfplots/4240)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 7\
**Last updated:** [June 14, 2017, 6:04am UTC](https://discourse.julialang.org/t/how-to-get-rid-of-scientific-format-numbers-with-plots-pgfplots/4240 "2017-06-14T06:04:40Z")

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MWE: using Plots pgfplots() x = collect(linspace(0.01,0.5,100)) p = plot(histogram(x)) savefig(p, "/tmp/x.pdf") The 0.05 label on the x axis shows up as 5⋅10⁻², which messes up the alignment. This is a more serious pro…

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## [Combining 3D scatter plot with a 3D heat map](https://discourse.julialang.org/t/combining-3d-scatter-plot-with-a-3d-heat-map/4250)

<div class="topic-metadata">

**Author:** [@jdnz](https://discourse.julialang.org/u/jdnz)\
**Replies:** 3\
**Last updated:** [June 13, 2017, 7:43pm UTC](https://discourse.julialang.org/t/combining-3d-scatter-plot-with-a-3d-heat-map/4250 "2017-06-13T19:43:47Z")

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I am trying to create a 3D visualization of a laser passing through a cloud of atoms. I attempted to do this using the GLVisualize backend for Plots.jl in the following way: using GLVisualize, Plots glvisualize() x = li…

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