# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=566

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**Page:** 567

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## [Multiple testing correction (e.g. FDR)?](https://discourse.julialang.org/t/multiple-testing-correction-e-g-fdr/2213)

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**Author:** [@Ali\_Vahdati](https://discourse.julialang.org/u/Ali_Vahdati)\
**Replies:** 2\
**Last updated:** [February 21, 2017, 1:27pm UTC](https://discourse.julialang.org/t/multiple-testing-correction-e-g-fdr/2213 "2017-02-21T13:27:16Z")

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Hi, I may have missed it, but is there already any function for multiple testing correction, such as FDR and Bonferroni? Thanks in advance, Ali

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## [Avoiding a nonlinear expression in JuMP](https://discourse.julialang.org/t/avoiding-a-nonlinear-expression-in-jump/2190)

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**Author:** [@varun7rs](https://discourse.julialang.org/u/varun7rs)\
**Replies:** 2\
**Last updated:** [February 20, 2017, 5:26pm UTC](https://discourse.julialang.org/t/avoiding-a-nonlinear-expression-in-jump/2190 "2017-02-20T17:26:47Z")

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Hello, I have formulated a flow conservation constraint in JuMP for a linear model. @constraint(SPF\_IM, cons5\[t in aggList, c in t.VNFChains, n in subGraph.nodes\], sum((fI\[t.ID,c.ID,e.ID\] - fO\[t.ID,c.ID…

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## [Unable to understand char-lstm example in MXNET for Julia](https://discourse.julialang.org/t/unable-to-understand-char-lstm-example-in-mxnet-for-julia/2186)

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**Author:** [@kishoreabhishek](https://discourse.julialang.org/u/kishoreabhishek)\
**Replies:** 0\
**Last updated:** [February 20, 2017, 1:53pm UTC](https://discourse.julialang.org/t/unable-to-understand-char-lstm-example-in-mxnet-for-julia/2186 "2017-02-20T13:53:30Z")

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I am trying to understand the char lstm example mentioned here - https://github.com/dmlc/MXNet.jl/blob/master/examples/char-lstm/lstm.jl Function lstm\_cell accepts the second parameter as previous state - function lstm…

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## [Minimum(df\[:value\]) and maximum(df\[:value\]) not in the documentation](https://discourse.julialang.org/t/minimum-df-value-and-maximum-df-value-not-in-the-documentation/2155)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 1\
**Last updated:** [February 17, 2017, 3:23pm UTC](https://discourse.julialang.org/t/minimum-df-value-and-maximum-df-value-not-in-the-documentation/2155 "2017-02-17T15:23:39Z")

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Hello, I just noticed that both minimum(df\[:value\]) and maximum(df\[:value\]) to retrive the minimum/maximum values of a column in a dataframe are not in the documentation… as they are not the standard min() max() functio…

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## [ANN: LossFunctions.jl](https://discourse.julialang.org/t/ann-lossfunctions-jl/2043)

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**Author:** [@Evizero](https://discourse.julialang.org/u/Evizero)\
**Replies:** 3\
**Last updated:** [February 17, 2017, 2:14am UTC](https://discourse.julialang.org/t/ann-lossfunctions-jl/2043 "2017-02-17T02:14:01Z")

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Hello everyone! After MLLabelUtils.jl, I am happy to announce the next JuliaML package to reach a mature state: LossFunctions.jl Github: GitHub - JuliaML/LossFunctions.jl: Julia package of loss functions for machine le…

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## [Heterogeneous blocked matrices](https://discourse.julialang.org/t/heterogeneous-blocked-matrices/2130)

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**Author:** [@dmbates](https://discourse.julialang.org/u/dmbates)\
**Replies:** 3\
**Last updated:** [February 16, 2017, 5:15pm UTC](https://discourse.julialang.org/t/heterogeneous-blocked-matrices/2130 "2017-02-16T17:15:49Z")

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I am struggling to come up with a sufficiently specific method signature to handle the Cholesky decomposition of heterogeneous blocked matrices, by which I mean that I have a square matrix of AbstractMatrix{Float64}, say…

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## [Plotting in windows?](https://discourse.julialang.org/t/plotting-in-windows/1847)

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**Author:** [@purplishrock](https://discourse.julialang.org/u/purplishrock)\
**Replies:** 12\
**Last updated:** [February 15, 2017, 8:15pm UTC](https://discourse.julialang.org/t/plotting-in-windows/1847 "2017-02-15T20:15:01Z")

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I’m having not having any luck for the backends in Plots under windows. I’ve tried pyplot, gr and plotlyjs. i tend to get a lot of \_show is not defined for this backend Also too, pyplot is giving me a page full of er…

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## [Copy nonlinear models](https://discourse.julialang.org/t/copy-nonlinear-models/2111)

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**Author:** [@Yankai\_Cao](https://discourse.julialang.org/u/Yankai_Cao)\
**Replies:** 1\
**Last updated:** [February 15, 2017, 3:08pm UTC](https://discourse.julialang.org/t/copy-nonlinear-models/2111 "2017-02-15T15:08:33Z")

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Is there any function to copy a nonlinear model? Also, I want to know how to combine two models, e.g., I want to combine the variables and constriants from two models into a new model and create a new objective using th…

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## [Linear parameter](https://discourse.julialang.org/t/linear-parameter/2112)

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**Author:** [@Yankai\_Cao](https://discourse.julialang.org/u/Yankai_Cao)\
**Replies:** 2\
**Last updated:** [February 15, 2017, 1:49pm UTC](https://discourse.julialang.org/t/linear-parameter/2112 "2017-02-15T13:49:49Z")

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I want to define a parameter so that the model will change if I set a different value for the parameter. The following is an example, while the real problem is much more complicated. using JuMP model = Model() @variab…

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## [Getting constraint values using JuMP](https://discourse.julialang.org/t/getting-constraint-values-using-jump/1996)

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**Author:** [@huckl3b3rry87](https://discourse.julialang.org/u/huckl3b3rry87)\
**Replies:** 6\
**Last updated:** [February 15, 2017, 1:48am UTC](https://discourse.julialang.org/t/getting-constraint-values-using-jump/1996 "2017-02-15T01:48:39Z")

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I am interested in getting the values of my constraints evaluated at a particular spot in the design space. Here is an example to explain what I am trying to do: using JuMP m = Model() @variable(m, x, start = 0.0) @vari…

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## [Pushing SQS message is not stable](https://discourse.julialang.org/t/pushing-sqs-message-is-not-stable/2098)

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**Author:** [@jwu](https://discourse.julialang.org/u/jwu)\
**Replies:** 1\
**Last updated:** [February 14, 2017, 3:34pm UTC](https://discourse.julialang.org/t/pushing-sqs-message-is-not-stable/2098 "2017-02-14T15:34:25Z")

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Hi, Julians, I am using AWS.jl to push hundreds of thousands of messages to SQS, but I got this error occasionally. I can manually restart it, it works fine again, but it is annoying when to produce a lot of messages. It…

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## [Using Adaptive variables in JuMPeR](https://discourse.julialang.org/t/using-adaptive-variables-in-jumper/2083)

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**Author:** [@gavelasq](https://discourse.julialang.org/u/gavelasq)\
**Replies:** 0\
**Last updated:** [February 13, 2017, 2:31pm UTC](https://discourse.julialang.org/t/using-adaptive-variables-in-jumper/2083 "2017-02-13T14:31:39Z")

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Hi, is there a way to know the actual adaptive policy when using adaptive variables (as in Ben-Tal et al. 2004)? What I mean with the adaptive policy is the values of the auxiliary variables that define the policy. I do …

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## [Suggestions for a package to read tabular data](https://discourse.julialang.org/t/suggestions-for-a-package-to-read-tabular-data/2071)

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**Author:** [@zhangliye](https://discourse.julialang.org/u/zhangliye)\
**Replies:** 12\
**Last updated:** [February 13, 2017, 8:55am UTC](https://discourse.julialang.org/t/suggestions-for-a-package-to-read-tabular-data/2071 "2017-02-13T08:55:12Z")

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I have thousands of \*.csv files to process, which contains table data. I usually use Python + Pandas. To get high performance, I tried to transfer from Python to Julia for some data processing work. I tested DataFrames.j…

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## [How to leverage Convex Optimization for Portfolio Optimization in Julia](https://discourse.julialang.org/t/how-to-leverage-convex-optimization-for-portfolio-optimization-in-julia/1765)

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**Author:** [@bjenkinsgit](https://discourse.julialang.org/u/bjenkinsgit)\
**Replies:** 9\
**Last updated:** [February 12, 2017, 4:08pm UTC](https://discourse.julialang.org/t/how-to-leverage-convex-optimization-for-portfolio-optimization-in-julia/1765 "2017-02-12T16:08:57Z")

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I’m trying to use Julia (0.5) and Convex.jl (with ECOS solver) to figure out, given a portfolio of 2 stocks, how can I distribute my allocations (in percent) across both stocks such that I maximize my portfolio return an…

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## [Plots keeps installing pyplot over and over and over](https://discourse.julialang.org/t/plots-keeps-installing-pyplot-over-and-over-and-over/2047)

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**Author:** [@purplishrock](https://discourse.julialang.org/u/purplishrock)\
**Replies:** 1\
**Last updated:** [February 12, 2017, 7:34am UTC](https://discourse.julialang.org/t/plots-keeps-installing-pyplot-over-and-over-and-over/2047 "2017-02-12T07:34:09Z")

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everytime a try to plot i get: If the code has a Segmentation fault error switch to qt v4.8.5 by pasting the following code into julia: if !Plots.is\_installed("PyPlot") Pkg.add("PyPlot") end withenv("PYTHON" =\> …

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## [New organization for Optim+family](https://discourse.julialang.org/t/new-organization-for-optim-family/2037)

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**Author:** [@pkofod](https://discourse.julialang.org/u/pkofod)\
**Replies:** 7\
**Last updated:** [February 12, 2017, 6:22am UTC](https://discourse.julialang.org/t/new-organization-for-optim-family/2037 "2017-02-12T06:22:36Z")

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I just wanted to bring people’s attention to https://github.com/JuliaOpt/Optim.jl/issues/358 . Now, let me say upfront: we’re not doing a popular vote, I just wanted to let people have a chance to comment. Basically, Ju…

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## [DataFrames testing error on Windows](https://discourse.julialang.org/t/dataframes-testing-error-on-windows/1969)

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**Author:** [@deepakagrawal](https://discourse.julialang.org/u/deepakagrawal)\
**Replies:** 5\
**Last updated:** [February 11, 2017, 3:06pm UTC](https://discourse.julialang.org/t/dataframes-testing-error-on-windows/1969 "2017-02-11T15:06:47Z")

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INFO: Testing DataFrames WARNING: Method definition ==(Base.Nullable{S}, Base.Nullable{T}) in module Base at nullable.jl:244 overwritten in module NullableArrays at C:\\Users\\agraw\\.julia\\v0.6\\NullableArrays\\src\\operators…

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## [Incorrect colors across different series in Plots.jl](https://discourse.julialang.org/t/incorrect-colors-across-different-series-in-plots-jl/2017)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 2\
**Last updated:** [February 10, 2017, 4:42pm UTC](https://discourse.julialang.org/t/incorrect-colors-across-different-series-in-plots-jl/2017 "2017-02-10T16:42:54Z")

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I have pushed a plot recipe for my package that produces a plot from an image that looks like this: In this recipe I tried to highlight the optimum solution in the x axis using the same color of the series. However, a…

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## [Parallel random number generation](https://discourse.julialang.org/t/parallel-random-number-generation/1950)

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**Author:** [@kkmann](https://discourse.julialang.org/u/kkmann)\
**Replies:** 11\
**Last updated:** [February 10, 2017, 1:39pm UTC](https://discourse.julialang.org/t/parallel-random-number-generation/1950 "2017-02-10T13:39:43Z")

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Hey, is the default random generation of the Distributions package safe for parallel use? I.e., are multiple streams of random numbers generated on different workers guaranteed to be independent? If not, what would be t…

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## [Can't run JuMP sample code](https://discourse.julialang.org/t/cant-run-jump-sample-code/2015)

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**Author:** [@Arrigo\_Benedetti](https://discourse.julialang.org/u/Arrigo_Benedetti)\
**Replies:** 2\
**Last updated:** [February 10, 2017, 2:36am UTC](https://discourse.julialang.org/t/cant-run-jump-sample-code/2015 "2017-02-10T02:36:16Z")

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I am trying to run the MLE sample code from the JuMP documentation at the bottom of this message under Windows. With Julia 0.5.0 I get this error ERROR: LoadError: ReadOnlyMemoryError() in solveProblem(::Ipopt.IpoptPr…

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## [Ticks and grid for x in Plots.jl](https://discourse.julialang.org/t/ticks-and-grid-for-x-in-plots-jl/1991)

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**Author:** [@Diego\_Javier\_Zea](https://discourse.julialang.org/u/Diego_Javier_Zea)\
**Replies:** 4\
**Last updated:** [February 9, 2017, 2:17pm UTC](https://discourse.julialang.org/t/ticks-and-grid-for-x-in-plots-jl/1991 "2017-02-09T14:17:21Z")

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Hi! Is there a way to delete the vertical grid without deleting the ticks on x? Best,

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## [OpenCL: Feedback on install on OpenSUSE](https://discourse.julialang.org/t/opencl-feedback-on-install-on-opensuse/1980)

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**Author:** [@Colin\_Beckingham](https://discourse.julialang.org/u/Colin_Beckingham)\
**Replies:** 6\
**Last updated:** [February 9, 2017, 12:55pm UTC](https://discourse.julialang.org/t/opencl-feedback-on-install-on-opensuse/1980 "2017-02-09T12:55:47Z")

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I have openSUSE Leap 42.2 fully patched. CUDA 8 is installed with a physical GT 610 card which works fine with CUDAnative. I have tried to wake up OpenCL on Julia 0.5 and 0.6; both install without complaint, but Pkg.test…

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## [Remove SDP variable in JuMP](https://discourse.julialang.org/t/remove-sdp-variable-in-jump/1999)

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**Author:** [@MarioSouto](https://discourse.julialang.org/u/MarioSouto)\
**Replies:** 1\
**Last updated:** [February 9, 2017, 12:55pm UTC](https://discourse.julialang.org/t/remove-sdp-variable-in-jump/1999 "2017-02-09T12:55:18Z")

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Dear all, I’m doing some experiments by solving the semidefinite relaxation of a MIP. To do so, I need to include an SDP variable but I’m having some trouble to remove such variable after solving the relaxation. Is ther…

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## [Announcement: ImageQuilting.jl](https://discourse.julialang.org/t/announcement-imagequilting-jl/1973)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 1\
**Last updated:** [February 8, 2017, 1:08pm UTC](https://discourse.julialang.org/t/announcement-imagequilting-jl/1973 "2017-02-08T13:08:34Z")

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Dear Geoscientists, I am happy to announce ImageQuilting.jl, a geostatistics/computer vision package I’ve been working on since Julia v0.3. I’ve tested it extensively, but I would like to get your feedback if possible. …

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## [Invisible axes, labels, etc. with PyPlot?](https://discourse.julialang.org/t/invisible-axes-labels-etc-with-pyplot/1816)

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**Author:** [@mgiugliano](https://discourse.julialang.org/u/mgiugliano)\
**Replies:** 10\
**Last updated:** [February 8, 2017, 9:26am UTC](https://discourse.julialang.org/t/invisible-axes-labels-etc-with-pyplot/1816 "2017-02-08T09:26:12Z")

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x = 0:0.1:2π y = sin(x) plot(x,y) ax = gca() ax\[:set\_frame\_on\](false) ?? ?? What else do I need to specify, in order to make everything but the plotted sinusoid invisible?

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## [Zero pivot error in LDLt factorization for large matrices](https://discourse.julialang.org/t/zero-pivot-error-in-ldlt-factorization-for-large-matrices/1966)

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**Author:** [@joernc](https://discourse.julialang.org/u/joernc)\
**Replies:** 3\
**Last updated:** [February 8, 2017, 3:51am UTC](https://discourse.julialang.org/t/zero-pivot-error-in-ldlt-factorization-for-large-matrices/1966 "2017-02-08T03:51:35Z")

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I encountered a problem with the LDLt factorization in the finite-difference solution of a 2D Poisson equation: u\_xx + u\_yy = -1 on 0 \< x \< 1 and 0 \< y \< 1 with u = 0 Dirichlet boundary conditions. The factorization work…

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## [Indicator constraints in JuMP](https://discourse.julialang.org/t/indicator-constraints-in-jump/1858)

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**Author:** [@bbrunaud](https://discourse.julialang.org/u/bbrunaud)\
**Replies:** 4\
**Last updated:** [February 7, 2017, 9:22pm UTC](https://discourse.julialang.org/t/indicator-constraints-in-jump/1858 "2017-02-07T21:22:45Z")

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Hello Gurobi added indicator constraints since version 7.0. CPLEX already had them a few versions ago. What would it take to get indicator constraints in JuMP. I know that Gurobi.jl should wrap the function but I don’t …

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## [Embedding plotting in a larger piece of code](https://discourse.julialang.org/t/embedding-plotting-in-a-larger-piece-of-code/1963)

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**Author:** [@ko56](https://discourse.julialang.org/u/ko56)\
**Replies:** 2\
**Last updated:** [February 7, 2017, 7:31pm UTC](https://discourse.julialang.org/t/embedding-plotting-in-a-larger-piece-of-code/1963 "2017-02-07T19:31:56Z")

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I am trying to include some plotting in a larger piece of code. Here is a very simple example: using Plots plotly() x = linspace(0,7) plot(x,sin(x)) 1+1 This works, but if I uncomment the last line, no plot appears…

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## [How to construct an image from RGB channels?](https://discourse.julialang.org/t/how-to-construct-an-image-from-rgb-channels/1947)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 2\
**Last updated:** [February 7, 2017, 4:12pm UTC](https://discourse.julialang.org/t/how-to-construct-an-image-from-rgb-channels/1947 "2017-02-07T16:12:49Z")

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Suppose I have 3 channels as arrays, I tried displaying the image below in Jupyter but it doesn’t look correct: using Images R = 255\*rand(100,100) G = 255\*rand(100,100) B = 255\*rand(100,100) img = colorview(RGB, R, G,…

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## [Alternatives to @expression for complex model constriction](https://discourse.julialang.org/t/alternatives-to-expression-for-complex-model-constriction/1829)

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**Author:** [@adowling2](https://discourse.julialang.org/u/adowling2)\
**Replies:** 4\
**Last updated:** [February 7, 2017, 12:24am UTC](https://discourse.julialang.org/t/alternatives-to-expression-for-complex-model-constriction/1829 "2017-02-07T00:24:17Z")

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I have created a rather complex set of Julia functions to assemble versions of an optimization problem. With a certain set of user inputs, I need to define “x” in my problem. For other inputs, I know that “x” can be remo…

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