# General Usage

**URL:** https://discourse.julialang.org/c/usage/6.md?page=1077

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**Page:** 1078

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## [Windows: capitalization of the HOME environment variable](https://discourse.julialang.org/t/windows-capitalization-of-the-home-environment-variable/200)

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**Author:** [@tshort](https://discourse.julialang.org/u/tshort)\
**Replies:** 5\
**Last updated:** [November 10, 2016, 10:36pm UTC](https://discourse.julialang.org/t/windows-capitalization-of-the-home-environment-variable/200 "2016-11-10T22:36:06Z")

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I have HOME defined in an environment variable. Starting with Julia v0.5.0, I could install packages, but I could not load them with using or import. It turns out, I had the capitalization wrong in my HOME environment va…

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## [Debug Lines](https://discourse.julialang.org/t/debug-lines/192)

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**Author:** [@Ward9250](https://discourse.julialang.org/u/Ward9250)\
**Replies:** 6\
**Last updated:** [November 10, 2016, 12:34pm UTC](https://discourse.julialang.org/t/debug-lines/192 "2016-11-10T12:34:49Z")

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Is there anything in julia at the moment, that allows statements to be printed that give an idea of what is going on inside a function, only if the script or function is run during a debug mode? Something like @debug pr…

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## [Testing whether a function is executing in a Jupyter notebook?](https://discourse.julialang.org/t/testing-whether-a-function-is-executing-in-a-jupyter-notebook/222)

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**Author:** [@cormullion](https://discourse.julialang.org/u/cormullion)\
**Replies:** 3\
**Last updated:** [November 10, 2016, 8:28am UTC](https://discourse.julialang.org/t/testing-whether-a-function-is-executing-in-a-jupyter-notebook/222 "2016-11-10T08:28:55Z")

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I want to be able to test whether a function is executing in a Jupyter notebook, so as to call the right display function. Perhaps something similar to this: julia\> isdefined(:IJulia) true although that works in the RE…

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## [Efficient workspace: type or immutable?](https://discourse.julialang.org/t/efficient-workspace-type-or-immutable/184)

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**Author:** [@Stephen\_Vavasis](https://discourse.julialang.org/u/Stephen_Vavasis)\
**Replies:** 2\
**Last updated:** [November 9, 2016, 11:55pm UTC](https://discourse.julialang.org/t/efficient-workspace-type-or-immutable/184 "2016-11-09T23:55:36Z")

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A recent thread on the Julia users’ newsgroup about SparseMatrixCSC made me realize that my code may have a hidden inefficiency. My code has the following structure. A key computational routine is GAssemble, similar to…

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## [Advice on a simple parallel task pattern(Beginner question)](https://discourse.julialang.org/t/advice-on-a-simple-parallel-task-pattern-beginner-question/97)

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**Author:** [@TsurHerman](https://discourse.julialang.org/u/TsurHerman)\
**Replies:** 1\
**Last updated:** [November 9, 2016, 6:31pm UTC](https://discourse.julialang.org/t/advice-on-a-simple-parallel-task-pattern-beginner-question/97 "2016-11-09T18:31:01Z")

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Hi , I am trying to achieve a perfect looking translucency effect in openGL for an AR headset. For that matter I need to sort the triangle faces every time the view point changes, since this is a live headset it means…

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## [Great performance hit on (simple) functions](https://discourse.julialang.org/t/great-performance-hit-on-simple-functions/93)

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**Author:** [@Arkantos493](https://discourse.julialang.org/u/Arkantos493)\
**Replies:** 10\
**Last updated:** [November 7, 2016, 2:40pm UTC](https://discourse.julialang.org/t/great-performance-hit-on-simple-functions/93 "2016-11-07T14:40:15Z")

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I’m part of a group writting a Finite-Element-Solver for a project at our university. We were totally fine writting the Julia program until we tried to optimise our code in terms of performance. After initialisation we…

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## [How to efficiently create a vector from a matrix comprehensions?](https://discourse.julialang.org/t/how-to-efficiently-create-a-vector-from-a-matrix-comprehensions/146)

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**Author:** [@cdsousa](https://discourse.julialang.org/u/cdsousa)\
**Replies:** 5\
**Last updated:** [November 7, 2016, 12:25am UTC](https://discourse.julialang.org/t/how-to-efficiently-create-a-vector-from-a-matrix-comprehensions/146 "2016-11-07T00:25:36Z")

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Since v0.5 comprehensions are shape-preserving (0.5-style comprehensions by JeffBezanson · Pull Request #16622 · JuliaLang/julia · GitHub), so m = \[x for x in \[1 2; 3 4\]\] results in a matrix. How should one, using a c…

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