# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=568

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**Page:** 569

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## [Any Julia deep learning frameworks use automatic differentiation?](https://discourse.julialang.org/t/any-julia-deep-learning-frameworks-use-automatic-differentiation/1596)

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**Author:** [@Phil\_Tomson](https://discourse.julialang.org/u/Phil_Tomson)\
**Replies:** 10\
**Last updated:** [January 24, 2017, 9:06pm UTC](https://discourse.julialang.org/t/any-julia-deep-learning-frameworks-use-automatic-differentiation/1596 "2017-01-24T21:06:48Z")

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Do any of the current Julia-based deep-learning frameworks use automatic differentiation? I’m pretty sure Mocha.jl does not. MXNET.jl seems to, but it actually is just a wrapper around the mxnet C++ code (so the AD is ta…

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## [Create quadratic objective will @objective and @NLobjective lead to different solution using Ipopt](https://discourse.julialang.org/t/create-quadratic-objective-will-objective-and-nlobjective-lead-to-different-solution-using-ipopt/1666)

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**Author:** [@Yankai\_Cao](https://discourse.julialang.org/u/Yankai_Cao)\
**Replies:** 1\
**Last updated:** [January 24, 2017, 7:35pm UTC](https://discourse.julialang.org/t/create-quadratic-objective-will-objective-and-nlobjective-lead-to-different-solution-using-ipopt/1666 "2017-01-24T19:35:46Z")

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We can create quadratic objective with either @objective or @NLobjective. The following is an example created with @NLobjective, and I get the objective value -17. However, when I changed @NLobjective to @objective and r…

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## [How to compute neighbour network using NearestNeighbors.jl](https://discourse.julialang.org/t/how-to-compute-neighbour-network-using-nearestneighbors-jl/1644)

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**Author:** [@pablosanjose](https://discourse.julialang.org/u/pablosanjose)\
**Replies:** 4\
**Last updated:** [January 23, 2017, 8:17am UTC](https://discourse.julialang.org/t/how-to-compute-neighbour-network-using-nearestneighbors-jl/1644 "2017-01-23T08:17:55Z")

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Using NearestNeighbor.jl I can find which points within a collection col are closest to a (different) given point or set of points. What I need is slightly different. I would like to compute the points p\_i in col that ar…

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## [ANN: Espresso.jl - an expression transformation package](https://discourse.julialang.org/t/ann-espresso-jl-an-expression-transformation-package/1641)

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**Author:** [@dfdx](https://discourse.julialang.org/u/dfdx)\
**Replies:** 1\
**Last updated:** [January 22, 2017, 7:49pm UTC](https://discourse.julialang.org/t/ann-espresso-jl-an-expression-transformation-package/1641 "2017-01-22T19:49:34Z")

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Espresso.jl is a new package for expression matching and transformation. A few functions that might be intersting for people working with Julia AST: matchex - match expression by pattern, extract matching elements; s…

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## [JuMP slow model generation](https://discourse.julialang.org/t/jump-slow-model-generation/1623)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 1\
**Last updated:** [January 20, 2017, 10:29pm UTC](https://discourse.julialang.org/t/jump-slow-model-generation/1623 "2017-01-20T22:29:19Z")

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I am constructing large LP model with JuMP, that I want to solve using Gurobi. I get the following warning: WARNING: The addition operator has been used on JuMP expressions a large number of times. This warning is saf…

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## [Plotting options for DataFrames with NullableArray](https://discourse.julialang.org/t/plotting-options-for-dataframes-with-nullablearray/1584)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 9\
**Last updated:** [January 20, 2017, 8:08pm UTC](https://discourse.julialang.org/t/plotting-options-for-dataframes-with-nullablearray/1584 "2017-01-20T20:08:26Z")

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I have been transitioning to Nullables in my data analysis code, then belatedly realized that neither Gadfly nor Plots.jl work with current master DataFrames. Is there a plotting package that is usable at the moment? ht…

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## [Error in precompiling JuMP on Julia 0.6](https://discourse.julialang.org/t/error-in-precompiling-jump-on-julia-0-6/1578)

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**Author:** [@deepakagrawal](https://discourse.julialang.org/u/deepakagrawal)\
**Replies:** 2\
**Last updated:** [January 19, 2017, 3:17am UTC](https://discourse.julialang.org/t/error-in-precompiling-jump-on-julia-0-6/1578 "2017-01-19T03:17:11Z")

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WARNING: Method definition exp(ForwardDiff.Dual{N, T} where T\<:Real where N) in module ForwardDiff at /home/deepak/.julia/v0.6/ForwardDiff/src/dual.jl:336 overwritten at /home/deepak/.julia/v0.6/ForwardDiff/src/dual.jl:3…

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## [Various constructors and equality for DataFrame](https://discourse.julialang.org/t/various-constructors-and-equality-for-dataframe/1551)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 5\
**Last updated:** [January 18, 2017, 2:20pm UTC](https://discourse.julialang.org/t/various-constructors-and-equality-for-dataframe/1551 "2017-01-18T14:20:19Z")

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I came across this problem when writing tests for a package, for a function that produces dataframes using the DataFrames(columns::AbstractArray{T\<:Any,1}, cnames::AbstractArray{Symbol,1}) constructor. Consider this MW…

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## [Creating and multiplying a large matrix high order of JuMP variables](https://discourse.julialang.org/t/creating-and-multiplying-a-large-matrix-high-order-of-jump-variables/1534)

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**Author:** [@huckl3b3rry87](https://discourse.julialang.org/u/huckl3b3rry87)\
**Replies:** 4\
**Last updated:** [January 18, 2017, 2:06pm UTC](https://discourse.julialang.org/t/creating-and-multiplying-a-large-matrix-high-order-of-jump-variables/1534 "2017-01-18T14:06:46Z")

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I am creating a package NLOptControl.jl that uses JuMP and when the final time is a design variable (tf\_var), the array DMatrix needs to be recalculated each iteration. I modified the functionality that calculates the D…

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## [How to read range of JLD file?](https://discourse.julialang.org/t/how-to-read-range-of-jld-file/954)

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**Author:** [@programista](https://discourse.julialang.org/u/programista)\
**Replies:** 19\
**Last updated:** [January 18, 2017, 1:04pm UTC](https://discourse.julialang.org/t/how-to-read-range-of-jld-file/954 "2017-01-18T13:04:28Z")

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julia\> using JLD julia\> D=load("D.jld","D",(:,1)) ERROR: too few arguments in println at strings/io.jl:25

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## [Is there an iterative solver that is able to operate on block-matrices (non-concatenated)](https://discourse.julialang.org/t/is-there-an-iterative-solver-that-is-able-to-operate-on-block-matrices-non-concatenated/1516)

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**Author:** [@rleegates](https://discourse.julialang.org/u/rleegates)\
**Replies:** 6\
**Last updated:** [January 18, 2017, 8:58am UTC](https://discourse.julialang.org/t/is-there-an-iterative-solver-that-is-able-to-operate-on-block-matrices-non-concatenated/1516 "2017-01-18T08:58:59Z")

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Dear users, I haven’t been able to find an implementation of an iterative solver (invertible matrix, no further specialization) general enough to work on matrices of matrices, i.e. A = \[B C D…; E F G…; H I J…; …\], b = \[…

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## [Math operations on NLparameter](https://discourse.julialang.org/t/math-operations-on-nlparameter/1474)

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**Author:** [@deepakagrawal](https://discourse.julialang.org/u/deepakagrawal)\
**Replies:** 4\
**Last updated:** [January 17, 2017, 10:48pm UTC](https://discourse.julialang.org/t/math-operations-on-nlparameter/1474 "2017-01-17T22:48:15Z")

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I am trying to write a NLexpression sum(alpha^j/prod(i for i=1:max(0,j)) for j=0:floor(C)) where C is NLparameter. I am getting following MethodError: no method matching floor(::JuMP.NonlinearParameter) Closest candid…

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## [GLVisualize maximum intensity projection: set 'inherent' attenuation](https://discourse.julialang.org/t/glvisualize-maximum-intensity-projection-set-inherent-attenuation/1501)

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**Author:** [@samuelpowell](https://discourse.julialang.org/u/samuelpowell)\
**Replies:** 5\
**Last updated:** [January 16, 2017, 10:27pm UTC](https://discourse.julialang.org/t/glvisualize-maximum-intensity-projection-set-inherent-attenuation/1501 "2017-01-16T22:27:29Z")

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I am using GLVisualize to render a maximum intensity protection of some volumetric data: viewable = visualize(array, :mip) \_view(viewable, window, camera=:perspective) This works okay, but at certain angles the field i…

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## [Solving QP and Conic Programs via Linear Cuts?](https://discourse.julialang.org/t/solving-qp-and-conic-programs-via-linear-cuts/1526)

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**Author:** [@ccoffrin](https://discourse.julialang.org/u/ccoffrin)\
**Replies:** 2\
**Last updated:** [January 16, 2017, 7:41pm UTC](https://discourse.julialang.org/t/solving-qp-and-conic-programs-via-linear-cuts/1526 "2017-01-16T19:41:41Z")

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In JuMP, is there a solver that takes in a convex model and an LP solver and solves the model by a sequence of linear cuts?

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## [Ipopt Windows Error](https://discourse.julialang.org/t/ipopt-windows-error/1504)

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**Author:** [@deepakagrawal](https://discourse.julialang.org/u/deepakagrawal)\
**Replies:** 2\
**Last updated:** [January 16, 2017, 6:34am UTC](https://discourse.julialang.org/t/ipopt-windows-error/1504 "2017-01-16T06:34:54Z")

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I got following error when using IpoptSolver on windows. I also tried running Pkg.test(“Ipopt”) and got similar error. LoadError: ReadOnlyMemoryError() in solveProblem(::Ipopt.IpoptProblem) at C:\\Users\\agraw\\.julia\\v0.…

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## [GLVisualize - primitives](https://discourse.julialang.org/t/glvisualize-primitives/1485)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 4\
**Last updated:** [January 15, 2017, 8:56pm UTC](https://discourse.julialang.org/t/glvisualize-primitives/1485 "2017-01-15T20:56:40Z")

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Hello, which primitives are there in GLVisualize? I found spheres and lines, but is there also a cylinder primitive? I would like to port some code from cgkit (Python) to Julia. They have a lot of primitives: http:/…

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## [GLVisualize example fails](https://discourse.julialang.org/t/glvisualize-example-fails/1482)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 2\
**Last updated:** [January 14, 2017, 6:13pm UTC](https://discourse.julialang.org/t/glvisualize-example-fails/1482 "2017-01-14T18:13:45Z")

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Hello, I try to run the following example code from the manual: https://gist.github.com/ufechner7/8559c4fe9c7e4b0ec0b858090684d5e5 This results in the following error message: julia\> include("viewer.jl") ERROR: LoadE…

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## [Kolmogorov–Smirnov test, retrieve output](https://discourse.julialang.org/t/kolmogorov-smirnov-test-retrieve-output/1480)

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**Author:** [@evolgenomology](https://discourse.julialang.org/u/evolgenomology)\
**Replies:** 2\
**Last updated:** [January 14, 2017, 1:42pm UTC](https://discourse.julialang.org/t/kolmogorov-smirnov-test-retrieve-output/1480 "2017-01-14T13:42:33Z")

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Hi, I would like to use the KS test on 2000 datasets and each time I run it just retrieve the output values into an array. Being quite new to Julia, I wonder how (and if) this is possible. Currently, I am doing Approxim…

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## [How to compute the smallest integer number strictly greater than a given number?](https://discourse.julialang.org/t/how-to-compute-the-smallest-integer-number-strictly-greater-than-a-given-number/1304)

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**Author:** [@chobbes](https://discourse.julialang.org/u/chobbes)\
**Replies:** 3\
**Last updated:** [January 14, 2017, 2:48am UTC](https://discourse.julialang.org/t/how-to-compute-the-smallest-integer-number-strictly-greater-than-a-given-number/1304 "2017-01-14T02:48:30Z")

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Is there a Julia function that returns the smallest integer number strictly greater than a given number? For example, if I give 0.5, it returns me 1.0. If I give 1.0, it returns 2.0? ceil() can do the former example for …

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## [MixedModels fit error](https://discourse.julialang.org/t/mixedmodels-fit-error/1416)

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**Author:** [@JordanCuevas](https://discourse.julialang.org/u/JordanCuevas)\
**Replies:** 6\
**Last updated:** [January 13, 2017, 5:19pm UTC](https://discourse.julialang.org/t/mixedmodels-fit-error/1416 "2017-01-13T17:19:06Z")

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I am trying to fit a fairly complicated mixed model using Julia and the MixedModels package, on a dataset that has ~3.5 million rows (see screen shot for model specification and errors). The model is nested, with the r…

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## [ArrayFire Julia: Performant way to calculate vector cross product?](https://discourse.julialang.org/t/arrayfire-julia-performant-way-to-calculate-vector-cross-product/1458)

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**Author:** [@Boxed](https://discourse.julialang.org/u/Boxed)\
**Replies:** 0\
**Last updated:** [January 13, 2017, 9:51am UTC](https://discourse.julialang.org/t/arrayfire-julia-performant-way-to-calculate-vector-cross-product/1458 "2017-01-13T09:51:20Z")

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Hi Is there a way to calculate vector cross product through ArrayFire.jl in a performant way? The function is not implemented in ArrayFire and the getindex() and setindex!() functions for Julia cause data movement betwe…

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## [Formula creation without direct name specification](https://discourse.julialang.org/t/formula-creation-without-direct-name-specification/1448)

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**Author:** [@evoclue](https://discourse.julialang.org/u/evoclue)\
**Replies:** 2\
**Last updated:** [January 12, 2017, 8:06pm UTC](https://discourse.julialang.org/t/formula-creation-without-direct-name-specification/1448 "2017-01-12T20:06:21Z")

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Say I have a DataFrame called mydata where names(mydata) is Symbol\[5001\] consisting of :y, :x1, :x2, :x3, :x4, … (the other 4995 symbols) … , :x5000. I want to fit models with the formula ModelFrame(y ~ x1, mydata), Mod…

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## [Which MCMC library for continuous time stochastic process inference?](https://discourse.julialang.org/t/which-mcmc-library-for-continuous-time-stochastic-process-inference/1422)

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**Author:** [@nbren12](https://discourse.julialang.org/u/nbren12)\
**Replies:** 12\
**Last updated:** [January 12, 2017, 8:14am UTC](https://discourse.julialang.org/t/which-mcmc-library-for-continuous-time-stochastic-process-inference/1422 "2017-01-12T08:14:42Z")

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I am just getting started in julia, and there seem to be many options for doing bayesian inference. I have been looking at Mamba and Klara, but I am not sure which is better for what I want to do: inference using continu…

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## [Factor multiplication values: incorrect reshape?](https://discourse.julialang.org/t/factor-multiplication-values-incorrect-reshape/1394)

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**Author:** [@hpoit](https://discourse.julialang.org/u/hpoit)\
**Replies:** 4\
**Last updated:** [January 11, 2017, 4:17pm UTC](https://discourse.julialang.org/t/factor-multiplication-values-incorrect-reshape/1394 "2017-01-11T16:17:24Z")

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I can’t get Cvaluespace to output the correct values, identical to table 3. I think it has to do with reshape, notebook is below. https://github.com/hpoit/DFactor.jl/blob/master/function%20DFmultiply.ipynb Thanks …

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## [Plots: Labeling](https://discourse.julialang.org/t/plots-labeling/1309)

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**Author:** [@Diger](https://discourse.julialang.org/u/Diger)\
**Replies:** 11\
**Last updated:** [January 11, 2017, 2:11am UTC](https://discourse.julialang.org/t/plots-labeling/1309 "2017-01-11T02:11:56Z")

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In old Plots I could use sth like: xlabel=“\\u3b7” which doesnt work anymore now. Also is it possible to increase the legend size and text?!?

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## [How to turn off warning in JuMP](https://discourse.julialang.org/t/how-to-turn-off-warning-in-jump/1400)

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**Author:** [@FANG\_Colin](https://discourse.julialang.org/u/FANG_Colin)\
**Replies:** 1\
**Last updated:** [January 10, 2017, 6:38pm UTC](https://discourse.julialang.org/t/how-to-turn-off-warning-in-jump/1400 "2017-01-10T18:38:47Z")

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I made a helper function for constraints """ If x is Bin & y is Int, it simply means x = y % 2. """ function addParityConstraint(model::JuMP.Model, x, y) @variable(model, odd\_dummy, Int) @constraint(model, x + y…

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## [ANN: QNaNs.jl (easier quiet NaNs)](https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387)

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**Author:** [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Replies:** 2\
**Last updated:** [January 10, 2017, 12:50pm UTC](https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387 "2017-01-10T12:50:37Z")

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QNaNs.jl Simplifies the use of quiet NaNs to propagate information from within numerical computations. ####Quick Look \> Pkg.add("QNaNs") \> using QNaNs \> a\_qnan = qnan(36) NaN \> payload = qnan( a\_qnan ) 36 \> typeof(a\_…

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## [Query on histc and histogram counts](https://discourse.julialang.org/t/query-on-histc-and-histogram-counts/1371)

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**Author:** [@Donald\_Lacombe](https://discourse.julialang.org/u/Donald_Lacombe)\
**Replies:** 5\
**Last updated:** [January 9, 2017, 7:52pm UTC](https://discourse.julialang.org/t/query-on-histc-and-histogram-counts/1371 "2017-01-09T19:52:17Z")

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Dear Julia Users, I want to count the number of times a zip code appears in a vector and found the following topic: I ran the following code: using StatsBase using DataFrames df1 = readtable("Test2.csv") Out\[4\]: ir…

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## [Cplex 32bit windows 32 bit](https://discourse.julialang.org/t/cplex-32bit-windows-32-bit/1365)

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**Author:** [@PLP](https://discourse.julialang.org/u/PLP)\
**Replies:** 8\
**Last updated:** [January 9, 2017, 6:41pm UTC](https://discourse.julialang.org/t/cplex-32bit-windows-32-bit/1365 "2017-01-09T18:41:51Z")

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Hello Is there some way to install cplex (Pkg.add(“CPLEX”)) on windows 32 bit ? When I to add CPLEX it is written that it could not find the CPLEX installation… Thanks

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## [JuMP: reuse solver objects?](https://discourse.julialang.org/t/jump-reuse-solver-objects/1368)

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**Author:** [@evanfields](https://discourse.julialang.org/u/evanfields)\
**Replies:** 1\
**Last updated:** [January 9, 2017, 3:24pm UTC](https://discourse.julialang.org/t/jump-reuse-solver-objects/1368 "2017-01-09T15:24:52Z")

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I’m using JuMP to solve lots of (fairly) small problems sequentially. Is there a major reason for/against reusing solver objects? I.e. better (A) or (B): A for i in 1:50 m = Model(solver = CbcSolver()) ... so…

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