# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=558

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

**Page:** 559

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## [Cannot create a random tensor](https://discourse.julialang.org/t/cannot-create-a-random-tensor/4709)

<div class="topic-metadata">

**Author:** [@Tomas\_Pevny](https://discourse.julialang.org/u/Tomas_Pevny)\
**Replies:** 0\
**Last updated:** [July 7, 2017, 6:56am UTC](https://discourse.julialang.org/t/cannot-create-a-random-tensor/4709 "2017-07-07T06:56:46Z")

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Hello all, Does anyone have experience with random number generation in TensorFlow.jl? At the moment, I am failing to create a random\_normal. If I invoke random\_normal(\[5,5\]) I receive following error message: ERROR…

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## [BigWig Reader](https://discourse.julialang.org/t/bigwig-reader/4677)

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**Author:** [@PoisonAlien](https://discourse.julialang.org/u/PoisonAlien)\
**Replies:** 5\
**Last updated:** [July 7, 2017, 3:00am UTC](https://discourse.julialang.org/t/bigwig-reader/4677 "2017-07-07T03:00:29Z")

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Hi, Before julia 0.6, I would read BigWig files without any problem BigWig.Reader(open("foo.bw")) but after the update, BigWig.Reader seems to be missing. This is the error I am getting: ERROR: LoadError: type DataTy…

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## [Videos from the JuMP developers meetup](https://discourse.julialang.org/t/videos-from-the-jump-developers-meetup/4667)

<div class="topic-metadata">

**Author:** [@miles.lubin](https://discourse.julialang.org/u/miles.lubin)\
**Replies:** 1\
**Last updated:** [July 6, 2017, 6:12pm UTC](https://discourse.julialang.org/t/videos-from-the-jump-developers-meetup/4667 "2017-07-06T18:12:34Z")

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On the week of June 12-16 we held the JuMP developers meetup/workshop at MIT. The slides and videos from the talks are now posted. I hope this will be a useful resource for anyone interested in JuMP’s internals, extensio…

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## [Problem with rendering animations with Plots.jl + GR backend](https://discourse.julialang.org/t/problem-with-rendering-animations-with-plots-jl-gr-backend/4661)

<div class="topic-metadata">

**Author:** [@CrocoDuck](https://discourse.julialang.org/u/CrocoDuck)\
**Replies:** 11\
**Last updated:** [July 6, 2017, 5:55pm UTC](https://discourse.julialang.org/t/problem-with-rendering-animations-with-plots-jl-gr-backend/4661 "2017-07-06T17:55:42Z")

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Hi there! I have been trying to get a gif file demonstrating the comb filtering resulting from delayed sinusoidal signals superposition. This is the code: using Plots gr(size = (1200, 800)) Fₛ = 96000 # Sample R…

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## [Getting our act together in the data ecosystem](https://discourse.julialang.org/t/getting-our-act-together-in-the-data-ecosystem/4522)

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**Author:** [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Replies:** 4\
**Last updated:** [July 4, 2017, 5:55pm UTC](https://discourse.julialang.org/t/getting-our-act-together-in-the-data-ecosystem/4522 "2017-07-04T17:55:45Z")

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Lately I have been guilty of running off and doing-my-own-thing while waiting for the data ecosystem to sort itself out when I could be making more valuable contributions that would both achieve the things I am trying to…

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## [Announcement: DataFrames Future Plans](https://discourse.julialang.org/t/announcement-dataframes-future-plans/266)

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**Author:** [@nalimilan](https://discourse.julialang.org/u/nalimilan)\
**Replies:** 26\
**Last updated:** [July 4, 2017, 5:54pm UTC](https://discourse.julialang.org/t/announcement-dataframes-future-plans/266 "2017-07-04T17:54:45Z")

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UPDATE: the plan described below is going to be implemented in a different way from what was initially announced. The DataFrames package will remain the same as it is now: instead, the new framework will be provided by t…

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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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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