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I saw a video about speed of loops in python, where it was explained that doing sum(range(N)) is much faster than manually looping through range and adding the variables together, since the former runs in C due to built-in functions being used, while in the latter the summation is done in (slow) python. I was curious what happens when adding numpy to the mix. As I expected np.sum(np.arange(N)) is the fastest, but sum(np.arange(N)) and np.sum(range(N)) are even slower than doing the naive for loop.

Why is this?

Here's the script I used to test, some comments about the supposed cause of slowing done where I know (taken mostly from the video) and the results I got on my machine (python 3.10.0, numpy 1.21.2):

updated script:

I have been stock on this error on my project when I add "proxy": "http://localhost:6000" in my package.json.

This is the error response after yarn start.

Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.

• options.allowedHosts[0] should be a non-empty string. error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

But everything is fine when I remove the "proxy": "http://localhost:6000".

This is on my package.json:

I am trying to run a CentOS 8 server through VirtualBox (6.1.30) (Vagrant), which worked just fine yesterday for me, but today I tried running a sudo yum update. I keep getting this error for some reason:

I have what I think is a standard formula, which is behaving differently depending on which Excel version I use, Excel 365 or Excel 2019

I just updated my Android studio to the version 2021.1.1 Canary 12. After struggling to make it work, I had to also upgrade my Gradle and Gradle plugin to 7.0.2. Now I can compile my project and launch my app on my mobile, everything is working. But when I try to generate a Signed APK, I get a strange message after building telling me: APK(s) generated successfully for module 'android-mobile-app-XXXX.app' with 0 build variants:

Even though the build seem to be successful I cannot find the generated APK anywhere (and considering the time it takes to give me that error, I don't even think it is building anything). Now, I have been generating an APK every week for years now, so I know my way around the folders, the different build variant output folders etc... Nothing changed in my way of generating an APK. I do it via AS and follow the very standard procedure.

Can someone point to me what am I missing here? I assume there is a way to select a specific build variant when generating a signed APK, how does it works?

PS: Obviously, I am selecting my variant here during the process:

PS2: I can generate a debug APK without any issue whatsoever.

I got this error when learning Next.js, using npx create-next-app command according to site documentation here https://nextjs.org/docs/api-reference/create-next-app. Everything works until I start the server,

Error stack:

Has anyone ever come across this issue?

When using react-scripts start, everything seems ok on first load. As soon as a change is made to a file, all the mouse event seem to stop working (can't click on buttons, inputs, no tooltips etc.), even though the browser appears to update.

If I refresh the page the events work again, until a file is changed.

This isn't a problem in production as the watcher isn't involved there.

Any ideas?

EDIT:
I've found the problem but I'm not sure what the solution is. It appears that a iFrame is added to the DOM when the watcher reloads. It looks like it has something to do with licenses. The body within the iFrame is empty but there is some minified JS with a comment on the top line:

/*! For license information please see iframe-bundle.js.LICENSE.txt */

Does anyone know how to prevent this iFrame appearing.

I have webpack-cli installed on my laravel project. I don't know why first of all we need it to run my vue app but this is causing an error:

When I run npm run dev or npm run hot

I'm facing a weird issue. Before I updated my Android Studio, everything went fine in flutter doctor. Once I've updated Android Studio, when I run the doctor, it's showing "Unable to find bundled Java version". I've already downloaded Java installer and installed it on my M1 Mac, but after I restarted, running flutter doctor still shows the same error. The weird thing is, when I uninstall the Arctic Fox version and re-install the older Android Studio version, everything goes fine again when running the doctor. How can I resolve this?