# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=549

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**Page:** 550

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## [Plots gr(): saving to file makes the on screen plot disappear forever](https://discourse.julialang.org/t/plots-gr-saving-to-file-makes-the-on-screen-plot-disappear-forever/7217)

<div class="topic-metadata">

**Author:** [@davide](https://discourse.julialang.org/u/davide)\
**Replies:** 5\
**Last updated:** [November 21, 2017, 1:12pm UTC](https://discourse.julialang.org/t/plots-gr-saving-to-file-makes-the-on-screen-plot-disappear-forever/7217 "2017-11-21T13:12:39Z")

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Hi, I am experiencing an unexpected behavior when saving to file plots produced with Plots gr() backend, through the REPL. When saving to file, the plot window on the screen disappears, and never comes back again when …

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## [Pinning a particular version of JuMP](https://discourse.julialang.org/t/pinning-a-particular-version-of-jump/7199)

<div class="topic-metadata">

**Author:** [@s\_bhattacharjee](https://discourse.julialang.org/u/s_bhattacharjee)\
**Replies:** 2\
**Last updated:** [November 20, 2017, 7:58pm UTC](https://discourse.julialang.org/t/pinning-a-particular-version-of-jump/7199 "2017-11-20T19:58:28Z")

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Hello, I am trying to pin JuMP v-0.9.0 to run a particular code. However, it is giving me following errors: Julia is fixed at 0.6.1 conflicting with requirement for JuMP JuMP is fixed at 0.9.0 conflicting with top-lev…

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## [Internal manipulation of complex hermitian matrix / explain the use of "RealHermSymComplexHerm" in symmetric.jl](https://discourse.julialang.org/t/internal-manipulation-of-complex-hermitian-matrix-explain-the-use-of-realhermsymcomplexherm-in-symmetric-jl/7136)

<div class="topic-metadata">

**Author:** [@Lian\_Yunlong](https://discourse.julialang.org/u/Lian_Yunlong)\
**Replies:** 7\
**Last updated:** [November 19, 2017, 2:23pm UTC](https://discourse.julialang.org/t/internal-manipulation-of-complex-hermitian-matrix-explain-the-use-of-realhermsymcomplexherm-in-symmetric-jl/7136 "2017-11-19T14:23:20Z")

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Internal manipulation of complex hermitian matrix / explain the use of “RealHermSymComplexHerm” in symmetric.jl I think Julia handles matrices with complex elements correctly. My task is to modify the spectrum of a Her…

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## [Jordan form of a matrix](https://discourse.julialang.org/t/jordan-form-of-a-matrix/7123)

<div class="topic-metadata">

**Author:** [@mforets](https://discourse.julialang.org/u/mforets)\
**Replies:** 9\
**Last updated:** [November 19, 2017, 9:05am UTC](https://discourse.julialang.org/t/jordan-form-of-a-matrix/7123 "2017-11-19T09:05:02Z")

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Is there an equivalent of Matlab’s jordan function, to compute the Jordan canonical form of a matrix? I didn’t find it by tab-completion and in the julia observer didn’t find anything relevant. A version over exact rings…

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## [Accuracy of Computing Determinants](https://discourse.julialang.org/t/accuracy-of-computing-determinants/6782)

<div class="topic-metadata">

**Author:** [@Hans\_W\_Borchers](https://discourse.julialang.org/u/Hans_W_Borchers)\
**Replies:** 3\
**Last updated:** [November 19, 2017, 1:13am UTC](https://discourse.julialang.org/t/accuracy-of-computing-determinants/6782 "2017-11-19T01:13:54Z")

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While trying out the R packages JuliaCall and XRJulia for calling Julia functions from R, I got interested in quite accurately determining the determinant of the 12-by-12 Hilbert matrix. julia\> A = \[1/(i+j-1) for i …

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## [Create missing columns (or rows) in a NamedArray with a default value](https://discourse.julialang.org/t/create-missing-columns-or-rows-in-a-namedarray-with-a-default-value/7128)

<div class="topic-metadata">

**Author:** [@scelles](https://discourse.julialang.org/u/scelles)\
**Replies:** 2\
**Last updated:** [November 18, 2017, 2:51pm UTC](https://discourse.julialang.org/t/create-missing-columns-or-rows-in-a-namedarray-with-a-default-value/7128 "2017-11-18T14:51:40Z")

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Hello, I would like to transform a Named Array (coming for FreqTable.jl freqtable) from x = NamedArray(\[2 0; 0 1; 1 2\]); idx\_rows = \["0", "1", "2"\] idx\_cols = \["0", "2"\] setnames!(x, idx\_rows, 1); setnames!(x, idx\_cols…

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## [Change objective coefficient iteratively for SOCP with quadratic objective](https://discourse.julialang.org/t/change-objective-coefficient-iteratively-for-socp-with-quadratic-objective/7090)

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**Author:** [@Ksun46](https://discourse.julialang.org/u/Ksun46)\
**Replies:** 0\
**Last updated:** [November 15, 2017, 7:57pm UTC](https://discourse.julialang.org/t/change-objective-coefficient-iteratively-for-socp-with-quadratic-objective/7090 "2017-11-15T19:57:59Z")

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Hi all, I am trying to write a program that will need to iteratively solve some problem with linear and second-order cone constraints and (minimize) quadratic objective function. To be more specific, at each iteration t…

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## [Atomic block in @async](https://discourse.julialang.org/t/atomic-block-in-async/7076)

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**Author:** [@Wikunia](https://discourse.julialang.org/u/Wikunia)\
**Replies:** 2\
**Last updated:** [November 15, 2017, 2:02am UTC](https://discourse.julialang.org/t/atomic-block-in-async/7076 "2017-11-15T02:02:04Z")

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I am using my own version of pmap as described here: https://docs.julialang.org/en/stable/manual/parallel-computing#Synchronization-With-Remote-References-1 Is there a way to run some block atomically? I have an array…

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## [Constraint involving numerical integration](https://discourse.julialang.org/t/constraint-involving-numerical-integration/7043)

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**Author:** [@MaximilianJHuber](https://discourse.julialang.org/u/MaximilianJHuber)\
**Replies:** 3\
**Last updated:** [November 14, 2017, 3:47pm UTC](https://discourse.julialang.org/t/constraint-involving-numerical-integration/7043 "2017-11-14T15:47:39Z")

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Hi! I try to write up a minimization problem with 5+131 variables, a quadratic objective involving the last 131 variables and 131 constraints that involve a numerical integration using Gauss-Hermite nodes. The variables…

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## [Gantt Chart](https://discourse.julialang.org/t/gantt-chart/6988)

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**Author:** [@Rahul\_Sharma](https://discourse.julialang.org/u/Rahul_Sharma)\
**Replies:** 9\
**Last updated:** [November 14, 2017, 10:59am UTC](https://discourse.julialang.org/t/gantt-chart/6988 "2017-11-14T10:59:03Z")

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Hello, I want to draw a gnatt chart for a particular schedule using Gadfly. I have the start times of all products for a given machine and also its processing times. Can you please tell me how to do that? Thanks!

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## [C callback for GSL](https://discourse.julialang.org/t/c-callback-for-gsl/7058)

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**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 1\
**Last updated:** [November 14, 2017, 6:41am UTC](https://discourse.julialang.org/t/c-callback-for-gsl/7058 "2017-11-14T06:41:03Z")

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I would like to add fixed points quadrature to GSL.jl and to understand how callbacks for GSL work, I read the blog post as linked in the documentation. Here is the code for Gauss-Legendre adaptive quadrature routine th…

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## [How to check if Plots.jl is installed and loaded?](https://discourse.julialang.org/t/how-to-check-if-plots-jl-is-installed-and-loaded/7047)

<div class="topic-metadata">

**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 12\
**Last updated:** [November 14, 2017, 6:02am UTC](https://discourse.julialang.org/t/how-to-check-if-plots-jl-is-installed-and-loaded/7047 "2017-11-14T06:02:11Z")

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I am writing a function that generates a plot. In case Plots.jl is not installed on the user’s machine or in case it is not loaded in the current Julia session I’d like to print a warning. What is a good way to achieve t…

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## [Get\_variable with initializer xavier](https://discourse.julialang.org/t/get-variable-with-initializer-xavier/7042)

<div class="topic-metadata">

**Author:** [@Colin\_Beckingham](https://discourse.julialang.org/u/Colin_Beckingham)\
**Replies:** 1\
**Last updated:** [November 13, 2017, 3:04pm UTC](https://discourse.julialang.org/t/get-variable-with-initializer-xavier/7042 "2017-11-13T15:04:30Z")

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I’m trying to emulate a python call to get\_variable() in Julia: Python: tf.get\_variable(name,size,initializer=tf.contrib.layers.xavier\_initializer(seed = 0)) Julia: get\_variable(size,…?..) but not getting the xavier…

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## [JuMP sum variables with arbitrary set of indices](https://discourse.julialang.org/t/jump-sum-variables-with-arbitrary-set-of-indices/7024)

<div class="topic-metadata">

**Author:** [@Rafal\_Machalica](https://discourse.julialang.org/u/Rafal_Machalica)\
**Replies:** 3\
**Last updated:** [November 12, 2017, 12:55pm UTC](https://discourse.julialang.org/t/jump-sum-variables-with-arbitrary-set-of-indices/7024 "2017-11-12T12:55:54Z")

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Hello, I’m trying to write a constraint with sum of variables with irregular indexes pattern. With regular indices it works fine: using JuMP m = Model() @variable(m, x\[1:100, 1:100\]) @constraint(m, sum(x\[i, j\] for i =…

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## [Limitation in CuArrays](https://discourse.julialang.org/t/limitation-in-cuarrays/7011)

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**Author:** [@Skoffer](https://discourse.julialang.org/u/Skoffer)\
**Replies:** 1\
**Last updated:** [November 11, 2017, 8:06pm UTC](https://discourse.julialang.org/t/limitation-in-cuarrays/7011 "2017-11-11T20:06:34Z")

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What is the reason for this limitation in CuArrays? When broadcasting, watch out for errors like: julia\> sin.(cos.(xs)) ERROR: CUDA error: invalid program counter (code #718, ERROR\_INVALID\_PC) A current limitation of …

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## [Error using sum in DistributedArrays](https://discourse.julialang.org/t/error-using-sum-in-distributedarrays/6651)

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**Author:** [@rveltz](https://discourse.julialang.org/u/rveltz)\
**Replies:** 2\
**Last updated:** [November 11, 2017, 7:08am UTC](https://discourse.julialang.org/t/error-using-sum-in-distributedarrays/6651 "2017-11-11T07:08:38Z")

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Hi, I am seeking some advice for using the following (piece) of code on a cluster. It is a simulation of a particular type of neural network with N neurons. When, for the last result of a paper, I do simulation for N=1…

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## [Variable and Equation scaling in JuMP](https://discourse.julialang.org/t/variable-and-equation-scaling-in-jump/5700)

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**Author:** [@Sharabh\_Shukla](https://discourse.julialang.org/u/Sharabh_Shukla)\
**Replies:** 3\
**Last updated:** [November 11, 2017, 2:45am UTC](https://discourse.julialang.org/t/variable-and-equation-scaling-in-jump/5700 "2017-11-11T02:45:25Z")

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HI everybody, I am writing a SOCP(Second Order Conic Program) in Julia, moving from GAMS. I was wondering how to get variable scaling in JuMP, I need it since in my model some of the variables and equations are badly sc…

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## [Parallel for triangular domain](https://discourse.julialang.org/t/parallel-for-triangular-domain/7000)

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**Author:** [@TomConlin](https://discourse.julialang.org/u/TomConlin)\
**Replies:** 0\
**Last updated:** [November 10, 2017, 9:21pm UTC](https://discourse.julialang.org/t/parallel-for-triangular-domain/7000 "2017-11-10T21:21:16Z")

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Apologies for leading with the wall of text, just feeling chuffed at the moment Background: “all v.s. all” comparing elements in a set against all other elements in the set and computing a “distance” between each pai…

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## [Construct discrete Bloch sum using GPU](https://discourse.julialang.org/t/construct-discrete-bloch-sum-using-gpu/6993)

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**Author:** [@louisponet](https://discourse.julialang.org/u/louisponet)\
**Replies:** 3\
**Last updated:** [November 10, 2017, 6:09pm UTC](https://discourse.julialang.org/t/construct-discrete-bloch-sum-using-gpu/6993 "2017-11-10T18:09:45Z")

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I’m taking my first plunge into the world of GPU computing. What I’m trying to do is to construct a bloch sum of a wavefunction which is defined over 3 unit cells. The idea is that for each point in space, I take the ori…

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## [How can i use more than one processor - or give tasks to each processor](https://discourse.julialang.org/t/how-can-i-use-more-than-one-processor-or-give-tasks-to-each-processor/6935)

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**Author:** [@leaoshark](https://discourse.julialang.org/u/leaoshark)\
**Replies:** 9\
**Last updated:** [November 9, 2017, 11:00am UTC](https://discourse.julialang.org/t/how-can-i-use-more-than-one-processor-or-give-tasks-to-each-processor/6935 "2017-11-09T11:00:34Z")

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Hello Guys … I am tryng to use parallel computing in julia I have to ideas …one is try to set more processors in julia starting ( i do not know how to do that using ATOM ) . or set a task to each processor … for exa…

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## [JuMP --\> Cbc infeasibility due to too many (valid) constraints?](https://discourse.julialang.org/t/jump-cbc-infeasibility-due-to-too-many-valid-constraints/6895)

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**Author:** [@Rafal\_Machalica](https://discourse.julialang.org/u/Rafal_Machalica)\
**Replies:** 6\
**Last updated:** [November 8, 2017, 7:36pm UTC](https://discourse.julialang.org/t/jump-cbc-infeasibility-due-to-too-many-valid-constraints/6895 "2017-11-08T19:36:46Z")

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Hello, I’m solving a numeric crosswords (something like this), and I run into an odd issue. I’m using integer programming and Cbc solver. If I type in all the constraints resulting from the given clues (sums of digits …

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## [Linking installed BONMIN with Julia](https://discourse.julialang.org/t/linking-installed-bonmin-with-julia/6951)

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**Author:** [@Rahul\_Sharma](https://discourse.julialang.org/u/Rahul_Sharma)\
**Replies:** 0\
**Last updated:** [November 8, 2017, 6:16am UTC](https://discourse.julialang.org/t/linking-installed-bonmin-with-julia/6951 "2017-11-08T06:16:47Z")

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I have installed BONMIN in my Ubuntu system and I want to link it with JuMP. (I have JuliaPro installed) Is there a way to do that? I don’t want to run the command Pkg.add(“CoinOptServices”) due to some reasons. Thanks …

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## [Simplex tableau](https://discourse.julialang.org/t/simplex-tableau/6652)

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**Author:** [@razieh95](https://discourse.julialang.org/u/razieh95)\
**Replies:** 1\
**Last updated:** [November 7, 2017, 8:56pm UTC](https://discourse.julialang.org/t/simplex-tableau/6652 "2017-11-07T20:56:11Z")

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Hi my freinds. how to get simplex table in julia? Thanks for your guidance

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## [MXNet installation fails](https://discourse.julialang.org/t/mxnet-installation-fails/6920)

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**Author:** [@v-i-s-h](https://discourse.julialang.org/u/v-i-s-h)\
**Replies:** 1\
**Last updated:** [November 6, 2017, 11:33pm UTC](https://discourse.julialang.org/t/mxnet-installation-fails/6920 "2017-11-06T23:33:23Z")

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My attempt to install MXNet fails on Mac OSX 10.13 with the following error. I tried in both Mac OSX 10.13 and Ubuntu 16.04. julia\> versioninfo() Julia Version 0.6.0 Commit 903644385b (2017-06-19 13:05 UTC) Platform Inf…

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## [Histogram fit error](https://discourse.julialang.org/t/histogram-fit-error/6900)

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**Author:** [@SebastianM-C](https://discourse.julialang.org/u/SebastianM-C)\
**Replies:** 3\
**Last updated:** [November 6, 2017, 1:34pm UTC](https://discourse.julialang.org/t/histogram-fit-error/6900 "2017-11-06T13:34:58Z")

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Hello, I sometimes get an InexactError() when using fit(Histogram, data, ws, 0:0.25:4, closed=:left). The issue is very strange because it doesn’t always happen. The same code sometimes runs fine, but sometimes I get …

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## [How to register functions from an array in JuMP?](https://discourse.julialang.org/t/how-to-register-functions-from-an-array-in-jump/6884)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 3\
**Last updated:** [November 5, 2017, 8:28pm UTC](https://discourse.julialang.org/t/how-to-register-functions-from-an-array-in-jump/6884 "2017-11-05T20:28:22Z")

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The signature to register a function in JuMP is as follows JuMP.register(m::Model, s::Symbol, dimension::Integer, f::Function, ∇f::Function, ∇²f::Function) I have an array of unnamed functions, like: funs = \[x -\> x^2,…

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## [Branch and Bound](https://discourse.julialang.org/t/branch-and-bound/6860)

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**Author:** [@Wikunia](https://discourse.julialang.org/u/Wikunia)\
**Replies:** 1\
**Last updated:** [November 3, 2017, 9:42pm UTC](https://discourse.julialang.org/t/branch-and-bound/6860 "2017-11-03T21:42:39Z")

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I’m a beginner in parallel computing and would like to get some ideas. My project is branch and bound and I’m wondering what the best parallel computing structure is. I have list of open branch nodes. What is the best …

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## [Using optim.jl ( optimization ) - like fminsearch in matlab](https://discourse.julialang.org/t/using-optim-jl-optimization-like-fminsearch-in-matlab/6709)

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**Author:** [@leaoshark](https://discourse.julialang.org/u/leaoshark)\
**Replies:** 48\
**Last updated:** [November 2, 2017, 8:48pm UTC](https://discourse.julialang.org/t/using-optim-jl-optimization-like-fminsearch-in-matlab/6709 "2017-11-02T20:48:24Z")

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Hello … it is possible to use optim to solve this ? R = \[0.5 1 2 3\] # so for each R I have one S S = \[1 2 3 4 \] SS(R) = quadgk(a-\> R\*(a^2) \* x\[1\] + R\*\*a\* x\[2\] ,0,Inf) for which x\[1\] and x\[2\] i have SS = S ???…

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## [Setting dual initial point for warm start](https://discourse.julialang.org/t/setting-dual-initial-point-for-warm-start/6828)

<div class="topic-metadata">

**Author:** [@Wikunia](https://discourse.julialang.org/u/Wikunia)\
**Replies:** 2\
**Last updated:** [November 1, 2017, 9:48pm UTC](https://discourse.julialang.org/t/setting-dual-initial-point-for-warm-start/6828 "2017-11-01T21:48:34Z")

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Is there a way to set a dual initial point for warm starting? I would like to use it in branch and bound using Ipopt (or any other nlp solver) in the backend for relaxation. Only warm starting on the primal point by set…

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## [Use Sign function in JuMP](https://discourse.julialang.org/t/use-sign-function-in-jump/6764)

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**Author:** [@Qifeng](https://discourse.julialang.org/u/Qifeng)\
**Replies:** 2\
**Last updated:** [October 31, 2017, 8:22pm UTC](https://discourse.julialang.org/t/use-sign-function-in-jump/6764 "2017-10-31T20:22:15Z")

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Dear all, I’m solving a MINLP problem in JuMP which contains a nonlinear constraint like this: y = x^2\*sign(x) #both x and y are continuous. Previously, I used Couenne through AmplNLWriter interface and got an error…

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