# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=324

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

**Page:** 325

---

## [Makie.jl: right align colorbar ticklabel](https://discourse.julialang.org/t/makie-jl-right-align-colorbar-ticklabel/70787)

<div class="topic-metadata">

**Author:** [@Kevin\_Kleinbeck](https://discourse.julialang.org/u/Kevin_Kleinbeck)\
**Replies:** 0\
**Last updated:** [November 2, 2021, 8:35am UTC](https://discourse.julialang.org/t/makie-jl-right-align-colorbar-ticklabel/70787 "2021-11-02T08:35:58Z")

</div>

Cheers. Consider the figure: I aim to align the tick labels of the colorbar on the right. This happens with ticklabelalign = (:right, :center); however then the tick labels lie within the colorbar. To fix this, I r…

---

## [How to remove the vertex in Graphs or LightGraphs?](https://discourse.julialang.org/t/how-to-remove-the-vertex-in-graphs-or-lightgraphs/70789)

<div class="topic-metadata">

**Author:** [@yewalenikhil65](https://discourse.julialang.org/u/yewalenikhil65)\
**Replies:** 3\
**Last updated:** [November 2, 2021, 10:13am UTC](https://discourse.julialang.org/t/how-to-remove-the-vertex-in-graphs-or-lightgraphs/70789 "2021-11-02T10:13:13Z")

</div>

julia\> myedges = \[ 1 =\> 2, 1 =\> 3, 2 =\> 1, 2 =\> 3, 3 =\> 1, 3 =\> 2, 3 =\> 4, 4 =\> 3, 4 =\> 8, 4 =\> 13, 5 =\> 6, 6 =\> 5, 7 =\> 8,…

---

## [Solving semilinear ODE with changing linear operator](https://discourse.julialang.org/t/solving-semilinear-ode-with-changing-linear-operator/70747)

<div class="topic-metadata">

**Author:** [@wsshin](https://discourse.julialang.org/u/wsshin)\
**Replies:** 3\
**Last updated:** [November 1, 2021, 8:47pm UTC](https://discourse.julialang.org/t/solving-semilinear-ode-with-changing-linear-operator/70747 "2021-11-01T20:47:19Z")

</div>

I am trying to solve a semilinear ODE whose linear operator depends on the solution: du/dt = A(u) u + f(u,t). The “linear” operator A(u) is diagonal. I am wondering what is the best approach to solve this problem by Di…

---

## [Hypatia -- JuMP](https://discourse.julialang.org/t/hypatia-jump/70717)

<div class="topic-metadata">

**Author:** [@geo](https://discourse.julialang.org/u/geo)\
**Replies:** 4\
**Last updated:** [November 2, 2021, 6:12am UTC](https://discourse.julialang.org/t/hypatia-jump/70717 "2021-11-02T06:12:07Z")

</div>

I know that JuMP does not support BigFloat; however Hypatia does. Is it possible to define a problem in JuMP, in Float64, but cause Hypatia to carry out the optimization in BigFloat? I am working on a problem, where the …

---

## [Periodic cost function for JuMP](https://discourse.julialang.org/t/periodic-cost-function-for-jump/70760)

<div class="topic-metadata">

**Author:** [@sefffal](https://discourse.julialang.org/u/sefffal)\
**Replies:** 6\
**Last updated:** [November 2, 2021, 1:57am UTC](https://discourse.julialang.org/t/periodic-cost-function-for-jump/70760 "2021-11-02T01:57:22Z")

</div>

Hello, I am trying to model a tricky optimization problem using JuMP. Exposition: I am trying to manufacture something a bit like a Fresnel lens. I have a continuous function of height vs x & y position, but we can on…

---

## [How to access S3 compatible CEPH bucket?](https://discourse.julialang.org/t/how-to-access-s3-compatible-ceph-bucket/70186)

<div class="topic-metadata">

**Author:** [@j\_u](https://discourse.julialang.org/u/j_u)\
**Replies:** 4\
**Last updated:** [November 2, 2021, 1:31am UTC](https://discourse.julialang.org/t/how-to-access-s3-compatible-ceph-bucket/70186 "2021-11-02T01:31:11Z")

</div>

Hi, Is there any recommended way to access S3 compatible CEPH bucket and send and receive a file? What would be the best way to do it? AWS.jl, or are there maybe any other packages? Are there maybe any examples apart to …

---

## [I have a hard time finding a good "upfirdn"](https://discourse.julialang.org/t/i-have-a-hard-time-finding-a-good-upfirdn/66540)

<div class="topic-metadata">

**Author:** [@psteffensen](https://discourse.julialang.org/u/psteffensen)\
**Replies:** 6\
**Last updated:** [November 2, 2021, 12:52am UTC](https://discourse.julialang.org/t/i-have-a-hard-time-finding-a-good-upfirdn/66540 "2021-11-02T00:52:29Z")

</div>

Hi, I am translating some code from Matlab to Julia and can’t find an equvalent to upfirdn. The only working option I have is to use PyCall and use the Python (SciPy) version. Like this: scipy\_signal = pyimport("scipy.…

---

## [Starting to program for Cuda do I have to load the drivers](https://discourse.julialang.org/t/starting-to-program-for-cuda-do-i-have-to-load-the-drivers/70676)

<div class="topic-metadata">

**Author:** [@anon69491625](https://discourse.julialang.org/u/anon69491625)\
**Replies:** 3\
**Last updated:** [November 1, 2021, 10:59pm UTC](https://discourse.julialang.org/t/starting-to-program-for-cuda-do-i-have-to-load-the-drivers/70676 "2021-11-01T22:59:39Z")

</div>

Hi there new to julia and cuda. Have loaded Linux Mint 20.2 and using the OPENSOURCE drivers for a Nvidia k5000 board. Graphics: Device-1: NVIDIA GK104GL \[Quadro K5000\] vendor: Hewlett-Packard driver: nouveau v: kern…

---

## [Polygon area on geoid](https://discourse.julialang.org/t/polygon-area-on-geoid/9107)

<div class="topic-metadata">

**Author:** [@mafla](https://discourse.julialang.org/u/mafla)\
**Replies:** 6\
**Last updated:** [November 1, 2021, 10:42pm UTC](https://discourse.julialang.org/t/polygon-area-on-geoid/9107 "2021-11-01T22:42:03Z")

</div>

Hi all, is it possible to estimate the area of a lat-lon-box with Geodesy.jl? Many thanks!

---

## [Inefficient compression of very large GeoTIFFs with ArchGDAL compared to gdal\_\* binaries](https://discourse.julialang.org/t/inefficient-compression-of-very-large-geotiffs-with-archgdal-compared-to-gdal-binaries/70687)

<div class="topic-metadata">

**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\
**Replies:** 3\
**Last updated:** [November 1, 2021, 7:29pm UTC](https://discourse.julialang.org/t/inefficient-compression-of-very-large-geotiffs-with-archgdal-compared-to-gdal-binaries/70687 "2021-11-01T19:29:49Z")

</div>

I’m using ArchGDAL to save climate data as large 3D GeoTIFFs, but I’ve noticed that files created in ArchGDAL are roughly 3x larger than those created with gdal\_\* binaries. As a diagnostic I eliminated all my calculation…

---

## [Current status of nested AD](https://discourse.julialang.org/t/current-status-of-nested-ad/70753)

<div class="topic-metadata">

**Author:** [@jlmaccal](https://discourse.julialang.org/u/jlmaccal)\
**Replies:** 0\
**Last updated:** [November 1, 2021, 6:56pm UTC](https://discourse.julialang.org/t/current-status-of-nested-ad/70753 "2021-11-01T18:56:04Z")

</div>

Could anyone comment on the current status of nested AD? What works? What doesn’t? And what does the future look like? In my application, I am trying to learn a conservative vector field—that is, a vector field that is …

---

## [Get best parameters for ODE modeling in Julia](https://discourse.julialang.org/t/get-best-parameters-for-ode-modeling-in-julia/70638)

<div class="topic-metadata">

**Author:** [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)\
**Replies:** 9\
**Last updated:** [November 1, 2021, 5:20pm UTC](https://discourse.julialang.org/t/get-best-parameters-for-ode-modeling-in-julia/70638 "2021-11-01T17:20:39Z")

</div>

Hello, I have been modeling some data of bacterial growth. I have first run a regression model to obtain the growth rates of the two species of the consortium. I then need to run some ODEs using logistic growth; these a…

---

## [Implementing Dry friction in modeling toolkit](https://discourse.julialang.org/t/implementing-dry-friction-in-modeling-toolkit/70743)

<div class="topic-metadata">

**Author:** [@yjr](https://discourse.julialang.org/u/yjr)\
**Replies:** 1\
**Last updated:** [November 1, 2021, 4:38pm UTC](https://discourse.julialang.org/t/implementing-dry-friction-in-modeling-toolkit/70743 "2021-11-01T16:38:30Z")

</div>

Hello, I would like to implement some function to have components simulating dry friction with modeling toolkit. As a starting point, I think the implementation from modelica is quite good. Most of it can be implemented…

---

## [3D Heatmap](https://discourse.julialang.org/t/3d-heatmap/70658)

<div class="topic-metadata">

**Author:** [@skolari93](https://discourse.julialang.org/u/skolari93)\
**Replies:** 8\
**Last updated:** [November 1, 2021, 10:48am UTC](https://discourse.julialang.org/t/3d-heatmap/70658 "2021-11-01T10:48:05Z")

</div>

Hello! Is there a way creatinge a 3D heatplot using Plots.jl? I try to visualize a 4D plot by plotting a 3D sphere and coloring the surface according to a function f. This is the closest I was able to do: plot(x,y,z,…

---

## [Any collaborative filtering by rank-constrained matrix factoristion in Julia?](https://discourse.julialang.org/t/any-collaborative-filtering-by-rank-constrained-matrix-factoristion-in-julia/70723)

<div class="topic-metadata">

**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 0\
**Last updated:** [November 1, 2021, 8:45am UTC](https://discourse.julialang.org/t/any-collaborative-filtering-by-rank-constrained-matrix-factoristion-in-julia/70723 "2021-11-01T08:45:22Z")

</div>

Hello, which is the state of the art package for collaborative filtering/missing imputation in julia using rank-constrained matrix factorisation and regularisation ? For example for constrained rank 1, the missing point…

---

## [Incorporating forcing functions in the ODE model](https://discourse.julialang.org/t/incorporating-forcing-functions-in-the-ode-model/70133)

<div class="topic-metadata">

**Author:** [@vembha](https://discourse.julialang.org/u/vembha)\
**Replies:** 28\
**Last updated:** [November 1, 2021, 2:15am UTC](https://discourse.julialang.org/t/incorporating-forcing-functions-in-the-ode-model/70133 "2021-11-01T02:15:01Z")

</div>

Hello, I am new to Turing and Julia, and need some help! I have been trying to estimate the parameters of a model with a discrete forcing function q(t), where the values of q(t) are discrete and are read from a file. C…

---

## [About training strategy](https://discourse.julialang.org/t/about-training-strategy/70528)

<div class="topic-metadata">

**Author:** [@iiisoo](https://discourse.julialang.org/u/iiisoo)\
**Replies:** 2\
**Last updated:** [November 1, 2021, 1:43am UTC](https://discourse.julialang.org/t/about-training-strategy/70528 "2021-11-01T01:43:55Z")

</div>

I am trying to run the example of PINN soling PDE( https://github.com/SciML/NeuralPDE.jl ) But when I use the: discretization = PhysicsInformedNN(chain, QuadratureTraining(),init\_params =initθ) in later part of: i…

---

## [Local infeasibility, Ipopt](https://discourse.julialang.org/t/local-infeasibility-ipopt/70026)

<div class="topic-metadata">

**Author:** [@FH96](https://discourse.julialang.org/u/FH96)\
**Replies:** 13\
**Last updated:** [October 31, 2021, 9:30pm UTC](https://discourse.julialang.org/t/local-infeasibility-ipopt/70026 "2021-10-31T21:30:35Z")

</div>

what can I do if the optimization results in “Converged to a point of local infeasibility. Problem may be infeasible.” despite of changing the start point? I am using JuMP+Ipopt

---

## [How to remove the box around the legend in PyPlot.jl](https://discourse.julialang.org/t/how-to-remove-the-box-around-the-legend-in-pyplot-jl/25528)

<div class="topic-metadata">

**Author:** [@mirtah](https://discourse.julialang.org/u/mirtah)\
**Replies:** 7\
**Last updated:** [October 31, 2021, 8:54pm UTC](https://discourse.julialang.org/t/how-to-remove-the-box-around-the-legend-in-pyplot-jl/25528 "2021-10-31T20:54:38Z")

</div>

hi. I would like to remove the box around the legend in my plot. May I ask you to how to do this. Sorry , I am new to Julia. this is the code I use. version of Julia :1.1.1 using PyPlot x=\[1,2,3,4\] y=x figure() …

---

## [Levels keyword but for scatter plot](https://discourse.julialang.org/t/levels-keyword-but-for-scatter-plot/70697)

<div class="topic-metadata">

**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 3\
**Last updated:** [October 31, 2021, 6:57pm UTC](https://discourse.julialang.org/t/levels-keyword-but-for-scatter-plot/70697 "2021-10-31T18:57:48Z")

</div>

Hi! The levels keyword of surface is useful: fig = Figure() xs = LinRange(0, 20, 50) ys = LinRange(0, 15, 50) zs = \[cos(x) \* sin(y) for x in xs, y in ys\] ax, hm = contourf(fig\[1, 1\], xs, ys, zs, colormap = :Spectr…

---

## [DAEs and Turing](https://discourse.julialang.org/t/daes-and-turing/70651)

<div class="topic-metadata">

**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 9\
**Last updated:** [October 31, 2021, 4:11pm UTC](https://discourse.julialang.org/t/daes-and-turing/70651 "2021-10-31T16:11:28Z")

</div>

1. Model and DifferentialEquations I’m trying to estimate initial values and parameters in a DAE using Turing. The structure of the DAE is as follows: \\frac{dx}{dt} = f(x,z,u;\\theta) \\\\ 0 = g(x,z,u;\\theta) I have avai…

---

## [PyPlot crashes REPL after re-install](https://discourse.julialang.org/t/pyplot-crashes-repl-after-re-install/70685)

<div class="topic-metadata">

**Author:** [@Fred\_He](https://discourse.julialang.org/u/Fred_He)\
**Replies:** 3\
**Last updated:** [October 31, 2021, 4:03pm UTC](https://discourse.julialang.org/t/pyplot-crashes-repl-after-re-install/70685 "2021-10-31T16:03:08Z")

</div>

Hello community, I deleted the miniconda by mistake, then installed back again. Unfortunately the pyplot doesn’t work anymore. I found the python version in miniconda is updated to 3.9, while the previous one was 3.7. I…

---

## [NeualPDE Model Save/Load](https://discourse.julialang.org/t/neualpde-model-save-load/70551)

<div class="topic-metadata">

**Author:** [@Dr\_M\_Umut\_DEMiREZEN](https://discourse.julialang.org/u/Dr_M_Umut_DEMiREZEN)\
**Replies:** 4\
**Last updated:** [October 31, 2021, 12:06pm UTC](https://discourse.julialang.org/t/neualpde-model-save-load/70551 "2021-10-31T12:06:09Z")

</div>

Hi, After training with NeuralPDE framework, how can we save the trained model for further operations? in Flux framework, @save and @load functionas are available and we can save/load the model as a BSON file. But in s…

---

## [Energy Planning Optimization](https://discourse.julialang.org/t/energy-planning-optimization/70592)

<div class="topic-metadata">

**Author:** [@Lwshalls](https://discourse.julialang.org/u/Lwshalls)\
**Replies:** 4\
**Last updated:** [October 30, 2021, 10:04pm UTC](https://discourse.julialang.org/t/energy-planning-optimization/70592 "2021-10-30T22:04:32Z")

</div>

Hey, Im currently starting my MEng thesis in chemical engineering with my focus on Energy Planning optimization for developing countries. Im developing software to provide guidance for policy makers. My supervisor is …

---

## [How to manually make prediction after training using LIBSVM](https://discourse.julialang.org/t/how-to-manually-make-prediction-after-training-using-libsvm/70669)

<div class="topic-metadata">

**Author:** [@Jaidy](https://discourse.julialang.org/u/Jaidy)\
**Replies:** 0\
**Last updated:** [October 30, 2021, 7:28pm UTC](https://discourse.julialang.org/t/how-to-manually-make-prediction-after-training-using-libsvm/70669 "2021-10-30T19:28:16Z")

</div>

Hi all, I have a dataset X\_train, y\_train that I feed to LIBSVM and get a model using the following code: model = svmtrain(X\_train’, y\_train, kernel = LIBSVM.Kernel.Linear) My question is how to make predictions manua…

---

## [StatsPlot -- axes labels overwrite each other](https://discourse.julialang.org/t/statsplot-axes-labels-overwrite-each-other/70539)

<div class="topic-metadata">

**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 18\
**Last updated:** [October 30, 2021, 3:50pm UTC](https://discourse.julialang.org/t/statsplot-axes-labels-overwrite-each-other/70539 "2021-10-30T15:50:21Z")

</div>

I’m plotting some results from a Turing session. Using the Turing recipe, I get: The problem is the tiny variation in the sample value, which makes the density plot look ugly/overlapping (numeric) labels along the ab…

---

## [Machine / Deep Learning with Gene Transcription levels](https://discourse.julialang.org/t/machine-deep-learning-with-gene-transcription-levels/70664)

<div class="topic-metadata">

**Author:** [@jamaas](https://discourse.julialang.org/u/jamaas)\
**Replies:** 0\
**Last updated:** [October 30, 2021, 3:16pm UTC](https://discourse.julialang.org/t/machine-deep-learning-with-gene-transcription-levels/70664 "2021-10-30T15:16:32Z")

</div>

I’m new to Julia, but have used R for many years. I’m embarking on attempting some machine learning, or perhaps deep learning that involves predicting gene transcrition levels from transcription factor binding sites. I…

---

## [DiffEqFlux NaN Bug with Neural ODE: "BoundsError: attempt to access 1-element Vector{Float64} at index \[2\]"](https://discourse.julialang.org/t/diffeqflux-nan-bug-with-neural-ode-boundserror-attempt-to-access-1-element-vector-float64-at-index-2/70596)

<div class="topic-metadata">

**Author:** [@mhr](https://discourse.julialang.org/u/mhr)\
**Replies:** 3\
**Last updated:** [October 30, 2021, 1:58pm UTC](https://discourse.julialang.org/t/diffeqflux-nan-bug-with-neural-ode-boundserror-attempt-to-access-1-element-vector-float64-at-index-2/70596 "2021-10-30T13:58:53Z")

</div>

I’m adapting some code from the following blog post: Differentiable Programming and Neural ODEs for Accelerating Model Based Reinforcement Learning and Optimal Control | by Paul Shen | The Startup | Medium. There’s an o…

---

## [How to create layouts in Julia plotting packages?](https://discourse.julialang.org/t/how-to-create-layouts-in-julia-plotting-packages/70586)

<div class="topic-metadata">

**Author:** [@leon](https://discourse.julialang.org/u/leon)\
**Replies:** 11\
**Last updated:** [October 30, 2021, 1:57am UTC](https://discourse.julialang.org/t/how-to-create-layouts-in-julia-plotting-packages/70586 "2021-10-30T01:57:39Z")

</div>

As a Matlab person, I’m so attached to the thinking as below: Handle = figure(1); % creating a figure handle Han01 = subplot(2, 2, 1); % creating a subplot handle (1st out of a total of 2x2 subplo…

---

## [Dimensionality Reduction Packages in Julia](https://discourse.julialang.org/t/dimensionality-reduction-packages-in-julia/67003)

<div class="topic-metadata">

**Author:** [@YummyPampers2](https://discourse.julialang.org/u/YummyPampers2)\
**Replies:** 27\
**Last updated:** [October 24, 2021, 8:19pm UTC](https://discourse.julialang.org/t/dimensionality-reduction-packages-in-julia/67003 "2021-10-24T20:19:30Z")

</div>

Hello Everyone: Are there any practical examples of PCA implementation that work with Julia? YES – I am familiar and have attempted to implement the instructions listed HERE. My goal however is to use a package that …

[Previous page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=323)

[Next page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=325)