# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=532

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

**Page:** 533

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## [\[ANN\] TexTables.jl for Building LaTeX tables in Julia](https://discourse.julialang.org/t/ann-textables-jl-for-building-latex-tables-in-julia/12089)

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**Author:** [@jacobadenbaum](https://discourse.julialang.org/u/jacobadenbaum)\
**Replies:** 15\
**Last updated:** [July 13, 2018, 12:00pm UTC](https://discourse.julialang.org/t/ann-textables-jl-for-building-latex-tables-in-julia/12089 "2018-07-13T12:00:46Z")

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Hi Everyone, I have been working recently on a new package for building and printing LaTeX tables with multi-level row and column indices. It’s still in Beta and unregistered (for now, although I hope to register it of…

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## [Libflame: Dense linear algebra library with modern design](https://discourse.julialang.org/t/libflame-dense-linear-algebra-library-with-modern-design/12328)

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**Author:** [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)\
**Replies:** 3\
**Last updated:** [July 12, 2018, 2:46pm UTC](https://discourse.julialang.org/t/libflame-dense-linear-algebra-library-with-modern-design/12328 "2018-07-12T14:46:14Z")

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Has any work been done (or contemplated) on wrapping the libflame dense-matrix linear algebra library in Julia? I know that so far blas is the go-to library, but this newer approach might be a better fit with a modern la…

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## [JuMP: infeasibility ray when variable bounds are present](https://discourse.julialang.org/t/jump-infeasibility-ray-when-variable-bounds-are-present/12285)

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**Author:** [@iaravena](https://discourse.julialang.org/u/iaravena)\
**Replies:** 2\
**Last updated:** [July 11, 2018, 6:14pm UTC](https://discourse.julialang.org/t/jump-infeasibility-ray-when-variable-bounds-are-present/12285 "2018-07-11T18:14:34Z")

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Hi all, I am stuck in a riddle with JuMP for which there might be an easier solution. Assume you are given an infeasible JuMP model with variable bounds. How to get a infeasibility ray for the dual taking into account t…

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## [Error solving ODE - Integrator stepped past tstops](https://discourse.julialang.org/t/error-solving-ode-integrator-stepped-past-tstops/12303)

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**Author:** [@mariepied](https://discourse.julialang.org/u/mariepied)\
**Replies:** 4\
**Last updated:** [July 11, 2018, 5:03pm UTC](https://discourse.julialang.org/t/error-solving-ode-integrator-stepped-past-tstops/12303 "2018-07-11T17:03:28Z")

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I get a error when solving a differential equation with the DifferentialEquations package. The error appear or not depending on the seed i’m specifying. I can’t understand from where this error come from, i’m not sure if…

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## [DataDeps and Google Drive](https://discourse.julialang.org/t/datadeps-and-google-drive/12271)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 14\
**Last updated:** [July 11, 2018, 8:44am UTC](https://discourse.julialang.org/t/datadeps-and-google-drive/12271 "2018-07-11T08:44:20Z")

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Hi all (and hopefully oxinabox)! I’m trying to access data on a Google Drive using the excellent DataDeps.jl. The drive has been shared with me (so I don’t own it) and the data in it isn’t zipped (there are multiple fo…

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## [Adaptive Sampling by](https://discourse.julialang.org/t/adaptive-sampling-by/12288)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 0\
**Last updated:** [July 10, 2018, 11:55am UTC](https://discourse.julialang.org/t/adaptive-sampling-by/12288 "2018-07-10T11:55:35Z")

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Seen on Twitter. Is this really something new?

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## [How to define a constraint from a string?](https://discourse.julialang.org/t/how-to-define-a-constraint-from-a-string/12157)

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**Author:** [@Manny8888](https://discourse.julialang.org/u/Manny8888)\
**Replies:** 12\
**Last updated:** [July 10, 2018, 9:22am UTC](https://discourse.julialang.org/t/how-to-define-a-constraint-from-a-string/12157 "2018-07-10T09:22:04Z")

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Hello, Trying to write a Kenken solver, I am using a text string to define the problem. The first lines of the string look like this: “”" 6 13 + A1 A2 B1 B2 180 \* C1 D1 D2 E1 9 + F1 F2 F3 2 = C2 “”" where the fi…

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## [Is there a Julia equivalent to the Octave Geometry or Matlab MatGeom package?](https://discourse.julialang.org/t/is-there-a-julia-equivalent-to-the-octave-geometry-or-matlab-matgeom-package/12274)

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**Author:** [@JacobHuesman](https://discourse.julialang.org/u/JacobHuesman)\
**Replies:** 2\
**Last updated:** [July 9, 2018, 6:42pm UTC](https://discourse.julialang.org/t/is-there-a-julia-equivalent-to-the-octave-geometry-or-matlab-matgeom-package/12274 "2018-07-09T18:42:33Z")

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Hi all, I’m starting to move my work over from Octave after significant frustration with the slowness of its plotting functionality. Does anyone know if their is a Julia package available similar to the Octave Geometry …

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## [ANN: Bukdu.jl v0.3.0, Octo.jl v0.1.0 for Julia 0.7](https://discourse.julialang.org/t/ann-bukdu-jl-v0-3-0-octo-jl-v0-1-0-for-julia-0-7/12268)

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**Author:** [@wookyoung](https://discourse.julialang.org/u/wookyoung)\
**Replies:** 0\
**Last updated:** [July 9, 2018, 9:44am UTC](https://discourse.julialang.org/t/ann-bukdu-jl-v0-3-0-octo-jl-v0-1-0-for-julia-0-7/12268 "2018-07-09T09:44:24Z")

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Bukdu.jl is a web development framework for Julia. It’s influenced by Phoenix framework. http://github.com/wookay/Bukdu.jl Octo.jl is an SQL Query DSL in Julia. https://github.com/wookay/Octo.jl REPL recorded by…

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## [Is there a way to print all columns in a NamedArray?](https://discourse.julialang.org/t/is-there-a-way-to-print-all-columns-in-a-namedarray/12070)

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**Author:** [@mwsohn](https://discourse.julialang.org/u/mwsohn)\
**Replies:** 4\
**Last updated:** [July 7, 2018, 12:11am UTC](https://discourse.julialang.org/t/is-there-a-way-to-print-all-columns-in-a-namedarray/12070 "2018-07-07T00:11:40Z")

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The NamedArray I want to print has five columns. I use “print” function to print it. Only four columns are printed and the middle column is replaced by an ellipsis. Is there a way to print all columns?

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## [Calling CUBLAS GEMM in Julia 0.6](https://discourse.julialang.org/t/calling-cublas-gemm-in-julia-0-6/10106)

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**Author:** [@una-dinosauria](https://discourse.julialang.org/u/una-dinosauria)\
**Replies:** 4\
**Last updated:** [July 6, 2018, 7:16pm UTC](https://discourse.julialang.org/t/calling-cublas-gemm-in-julia-0-6/10106 "2018-07-06T19:16:52Z")

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I had some code using CUBLAS.jl for matrix multiplication in the GPU. I updated some packages, and now my code is breaking apparently because CUDAdrv.jl does not support OwnedPtr anymore, and CUBLAS.jl relies heavily on…

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## [Optimizing column reduce with CUDAnative](https://discourse.julialang.org/t/optimizing-column-reduce-with-cudanative/10909)

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**Author:** [@Lian\_Yunlong](https://discourse.julialang.org/u/Lian_Yunlong)\
**Replies:** 5\
**Last updated:** [July 6, 2018, 6:22pm UTC](https://discourse.julialang.org/t/optimizing-column-reduce-with-cudanative/10909 "2018-07-06T18:22:25Z")

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Hi everyone, I got a piece of code to optimize. It is the column reduce algorithm, which takes a 2d array and sums the first axis, then write to the 1d array as output. I have my code but it is sloww. Does anyone have g…

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## [How to install feather using PyCall?](https://discourse.julialang.org/t/how-to-install-feather-using-pycall/9156)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 16\
**Last updated:** [July 6, 2018, 5:42pm UTC](https://discourse.julialang.org/t/how-to-install-feather-using-pycall/9156 "2018-07-06T17:42:38Z")

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I am trying to create some benchmark for writing tabular data to disk. So I wnated to install feather in Julia. But the below gives errors using PyCall using Conda, DataFrames, FileIO #Conda.add("pandas") # need to run …

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## [Newbie looking for help with Constraints in JuMP](https://discourse.julialang.org/t/newbie-looking-for-help-with-constraints-in-jump/12200)

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**Author:** [@mkt](https://discourse.julialang.org/u/mkt)\
**Replies:** 2\
**Last updated:** [July 6, 2018, 12:42pm UTC](https://discourse.julialang.org/t/newbie-looking-for-help-with-constraints-in-jump/12200 "2018-07-06T12:42:29Z")

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Hi all, I am trying to make a model of an energy market with storage but I’m having some problems using constraints. There are some variables that I want to fix but it doesn’t seem to be working. I’ve creating a simpler…

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## [Piecewise differential equations](https://discourse.julialang.org/t/piecewise-differential-equations/12187)

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**Author:** [@francisco](https://discourse.julialang.org/u/francisco)\
**Replies:** 9\
**Last updated:** [July 6, 2018, 1:52pm UTC](https://discourse.julialang.org/t/piecewise-differential-equations/12187 "2018-07-06T13:52:37Z")

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Hello, I am new at Julia, I would like to solve this system \\frac{dx}{dt} = k1y \\ \\frac{dy}{dt} = k2y+I where k1 and k2 are constant parameters. however, I=0 when y,0 or Ky otherwise, where k is a constant value. I …

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## [Filepaths in a module](https://discourse.julialang.org/t/filepaths-in-a-module/12208)

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**Author:** [@Libbum](https://discourse.julialang.org/u/Libbum)\
**Replies:** 2\
**Last updated:** [July 6, 2018, 12:02pm UTC](https://discourse.julialang.org/t/filepaths-in-a-module/12208 "2018-07-06T12:02:20Z")

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I’m having difficulty finding the best way to manage external data files in a module I’m writing. Say we have a module Foo that we add to our local packages through Pkg.clone("https://repo.com/Foo.git"). In the reposito…

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## [What is the optimal way of updating CuArray?](https://discourse.julialang.org/t/what-is-the-optimal-way-of-updating-cuarray/12182)

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**Author:** [@Lian\_Yunlong](https://discourse.julialang.org/u/Lian_Yunlong)\
**Replies:** 7\
**Last updated:** [July 5, 2018, 6:17pm UTC](https://discourse.julialang.org/t/what-is-the-optimal-way-of-updating-cuarray/12182 "2018-07-05T18:17:42Z")

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Hi, I observed an interesting behavior during the optimisation of my code with CUDAnative.jl I have the following code using CUDAnative using CUDAdrv for a=1:100 for b=1:100 X = ... # rather complicated …

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## [Generalized eigen problem using LinearMap?](https://discourse.julialang.org/t/generalized-eigen-problem-using-linearmap/12168)

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**Author:** [@fgerick](https://discourse.julialang.org/u/fgerick)\
**Replies:** 3\
**Last updated:** [July 5, 2018, 6:40am UTC](https://discourse.julialang.org/t/generalized-eigen-problem-using-linearmap/12168 "2018-07-05T06:40:47Z")

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Hello there, I’m trying to solve the generalized eigen problem Ax=\\lambda Bx with A and B being linear maps. However, I encountered a problem when using a shift-invert method (A-\\sigma B)^{-1}Bx=\\frac{1}{\\lambda-\\sigma}…

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## [PostgreSQL in Julia: LibPQ.jl](https://discourse.julialang.org/t/postgresql-in-julia-libpq-jl/9379)

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**Author:** [@iamed2](https://discourse.julialang.org/u/iamed2)\
**Replies:** 9\
**Last updated:** [July 5, 2018, 6:38am UTC](https://discourse.julialang.org/t/postgresql-in-julia-libpq-jl/9379 "2018-07-05T06:38:29Z")

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LibPQ.jl v0.3.0 is released so I’m announcing it here! LibPQ.jl will now be the fastest and easiest way to work with PostgreSQL in Julia. There are still features to be added, but it’s ready for use. Currently your best…

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## [The best way to visualize optimization results in juMP](https://discourse.julialang.org/t/the-best-way-to-visualize-optimization-results-in-jump/12122)

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**Author:** [@jayce\_ram](https://discourse.julialang.org/u/jayce_ram)\
**Replies:** 3\
**Last updated:** [July 4, 2018, 2:23pm UTC](https://discourse.julialang.org/t/the-best-way-to-visualize-optimization-results-in-jump/12122 "2018-07-04T14:23:49Z")

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I have been working for some months in the optimization domain. I have a huge problem that can easily reach \>500k variables. These variables represent many different things over a time-slice. After getting the solution, …

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## [Packages for DataFrame manipulation/query](https://discourse.julialang.org/t/packages-for-dataframe-manipulation-query/12148)

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**Author:** [@gbenatt92](https://discourse.julialang.org/u/gbenatt92)\
**Replies:** 5\
**Last updated:** [July 4, 2018, 12:12pm UTC](https://discourse.julialang.org/t/packages-for-dataframe-manipulation-query/12148 "2018-07-04T12:12:42Z")

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Hi all, newcomer here! I know there was a lot of discussion on the past over DataFrames and where it’s headed, but my question is about the current packages for dataframe manipulation. I’ve come across both DataFramesM…

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## [What is the maximal number of arguments a CUDAnative kernel can take? argc = 16 yields "Error: invalid kernel call; too many arguments"](https://discourse.julialang.org/t/what-is-the-maximal-number-of-arguments-a-cudanative-kernel-can-take-argc-16-yields-error-invalid-kernel-call-too-many-arguments/12143)

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**Author:** [@Lian\_Yunlong](https://discourse.julialang.org/u/Lian_Yunlong)\
**Replies:** 6\
**Last updated:** [July 4, 2018, 8:46am UTC](https://discourse.julialang.org/t/what-is-the-maximal-number-of-arguments-a-cudanative-kernel-can-take-argc-16-yields-error-invalid-kernel-call-too-many-arguments/12143 "2018-07-04T08:46:51Z")

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I have a kernel to pass to @cuda in CUDAnative.jl. It is a kernel function which takes 16 arguments: function TrAXBY\_CUDA!(cuTMP,G1,G2,Ind2,IX,JX,VX,IY,JY,VY,nΩ,nK,nnzX,nnzY,dimX,dimY) ... ... return n…

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## [Does JuMP convert SOCP into QCP automatically?](https://discourse.julialang.org/t/does-jump-convert-socp-into-qcp-automatically/12085)

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**Author:** [@SingingKim](https://discourse.julialang.org/u/SingingKim)\
**Replies:** 2\
**Last updated:** [July 3, 2018, 11:21pm UTC](https://discourse.julialang.org/t/does-jump-convert-socp-into-qcp-automatically/12085 "2018-07-03T23:21:18Z")

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I’d like to know whether JuMP automatically converts SOCP into QCP. Also is one formulation any faster than the other? (I’m using Gurobi) (a) This constraint is in quadratic form resulting in QCP. x^2 + y^2 \<= z^2…

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## [Optimizing an array of variables using JuMP (NLP)](https://discourse.julialang.org/t/optimizing-an-array-of-variables-using-jump-nlp/12104)

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**Author:** [@rhuffman](https://discourse.julialang.org/u/rhuffman)\
**Replies:** 3\
**Last updated:** [July 3, 2018, 7:25pm UTC](https://discourse.julialang.org/t/optimizing-an-array-of-variables-using-jump-nlp/12104 "2018-07-03T19:25:27Z")

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Hi all, I’m trying to formulate a nonlinear optimization problem with JuMP. Specifically, I’m looking to minimize the sum of the products of certain values in a matrix where one matrix is variable, and two additional ma…

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## [JuMP - Get basis for integer solution](https://discourse.julialang.org/t/jump-get-basis-for-integer-solution/12138)

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**Author:** [@mbesancon](https://discourse.julialang.org/u/mbesancon)\
**Replies:** 0\
**Last updated:** [July 3, 2018, 4:48pm UTC](https://discourse.julialang.org/t/jump-get-basis-for-integer-solution/12138 "2018-07-03T16:48:49Z")

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I was wondering if there is a way to get the basis at a final node of a branch-and-bound procedure, so including the additional constraints from cuts and bounds. My goal is to compute a cone pointing from the feasible v…

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## [Simulating large nontrivial SDE systems: algorithms, reliability and speed](https://discourse.julialang.org/t/simulating-large-nontrivial-sde-systems-algorithms-reliability-and-speed/12082)

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**Author:** [@lappet](https://discourse.julialang.org/u/lappet)\
**Replies:** 7\
**Last updated:** [July 3, 2018, 7:30am UTC](https://discourse.julialang.org/t/simulating-large-nontrivial-sde-systems-algorithms-reliability-and-speed/12082 "2018-07-03T07:30:43Z")

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In short, I am interested in the simulation of large systems of nontrivial stochastic differential equations as they arise when applying phase-space methods to interacting quantum systems. As an intro example: when one …

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## [Questions on rigid body dynamics & Julia](https://discourse.julialang.org/t/questions-on-rigid-body-dynamics-julia/11968)

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**Author:** [@kyle.carbon](https://discourse.julialang.org/u/kyle.carbon)\
**Replies:** 13\
**Last updated:** [July 3, 2018, 3:29am UTC](https://discourse.julialang.org/t/questions-on-rigid-body-dynamics-julia/11968 "2018-07-03T03:29:00Z")

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Hi all! I’m just getting started with Julia. I’ll be working on motion planning algorithms and controls for rigid bodies. I’ve started to play around with various packages and had some general questions: RigidBodyDyna…

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## [Store CuArrays on a mutable struct?](https://discourse.julialang.org/t/store-cuarrays-on-a-mutable-struct/11605)

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**Author:** [@floswald](https://discourse.julialang.org/u/floswald)\
**Replies:** 5\
**Last updated:** [July 2, 2018, 8:17pm UTC](https://discourse.julialang.org/t/store-cuarrays-on-a-mutable-struct/11605 "2018-07-02T20:17:34Z")

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hi, I seem to understand that I cannot store a (reference to?) a CuArray on a struct: mutable struct Param eta :: Float64 beta :: Float64 alpha :: Float64 delta :: Float64 mu :: Float64 rho :: Float64 sigm…

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## [Probabilistic programming with source transformations](https://discourse.julialang.org/t/probabilistic-programming-with-source-transformations/8047)

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**Author:** [@cscherrer](https://discourse.julialang.org/u/cscherrer)\
**Replies:** 66\
**Last updated:** [July 2, 2018, 1:59pm UTC](https://discourse.julialang.org/t/probabilistic-programming-with-source-transformations/8047 "2018-07-02T13:59:52Z")

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I have the very beginnings of a probabilistic programming language: Here’s a link to the gist The high-level idea is to represent a model by a quoted expression, and to express inference in terms of macros to transform…

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## [Dual: "getdual()" is not working for Conic/Quadratic constraints](https://discourse.julialang.org/t/dual-getdual-is-not-working-for-conic-quadratic-constraints/11884)

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**Author:** [@SingingKim](https://discourse.julialang.org/u/SingingKim)\
**Replies:** 6\
**Last updated:** [June 30, 2018, 7:06pm UTC](https://discourse.julialang.org/t/dual-getdual-is-not-working-for-conic-quadratic-constraints/11884 "2018-06-30T19:06:00Z")

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How can I get dual values for Conic/Quadratic constraints? getdual() function works fine for LPs, however it doesn’t work for QP or SOCP. Below is a sample code. using JuMP, Gurobi m = Model(solver=GurobiSolver()) @va…

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