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jvm - programmatically setting max java heap size

Is there a way to set the max java heap size programmatically instead of as a vm argument? Something like: System ... heap variable>", "1000m"); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Can I reassign a mutable slice reference to a sub-slice of itself?

I'm implementing a stack-like structure, where the structure holds a mutable reference to a slice. struct ... interested in more explicitly? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is a default constructor required when storing in a map?

I'm getting the error: error: no matching function for call to 'A::A()' note: candidates are: A::A ... wants a constructor with no parameters. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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syntax - In Perl, what is the difference between accessing an array element using @a[$i] as opposed to using $a[$i]?

Basic syntax tutorials I followed do not make this clear: Is there any practical/philosophical/context-dependent/tricky ... same in both cases. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Appcompat does not work

I am trying to use appcompat in my application. I have done everything according to the instructions. But when I add ... am I not doing right? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to debug in Codeblocks?

I just finished coding my program but am facing a few logic errors. I want to debug the program. I am using ... do this? Thanks for your help See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - H2 database column name "GROUP" is a reserved word

How do I create a table in H2 with a column named GROUP? I saw an example that used something like [*] a while ago, but I can't seem to find it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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xcodebuild - xcframework does not contain internal frameworks

I am trying to create an .xcframework file for a few third party libraries I'm using. Following the ... the way xcodebuild works anytime. See Question&Answers more detail:os...

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ios - Swift override function in extension

If I have a class: class Spaceship<FuelType> { function prepareForLiftoff() throws { //Start the countdown! ... the standard library functions? See Question&Answers more detail:os...

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return value at a position from STRING_SPLIT in SQL Server 2016

Can I return a value at a particular position with the STRING_SPLIT function in SQL Server 2016 or higher? I ... the value for this function. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Matlab VS Python - eig(A,B) VS sc.linalg.eig(A,B)

I have the following matrices sigma and sigmad: sigma: 1.9958 0.7250 0.7250 1.3167 sigmad: 4.8889 1.1944 1. ... .9400 But the d's do coincide. See Question&Answers more detail:os...

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printing - twitter bootstrap icons are missing in print

Glyphicons are missing when I hit 'Print', but are shown correctly in browser window. I'm talking about a ... Bootstrap icons shown in print? See Question&Answers more detail:os...

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expression - PHP use string as operator

Say I have a string, $char. $char == "*". I also have two variables, $a and $b, which equal "4" and "5" ... $b, ie 4 * 5 ? Thanks :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why infinite recursion leads to seg fault

Why infinite recursion leads to seg fault ? Why stack overflow leads to seg fault. I am looking for detailed explanation. ... main() { f(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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function - What does this '()' notation mean?

I just started to learn F#. The book uses the following notation: let name() = 3 name() what that differs from this: let name = 3 name ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pip - Why is 'pip3 install netifaces' failing on Debian 10 Buster?

I setup a new Debian 10 (Buster) instance on AWS EC2, and was able to install a pip3 package that ... object has no attribute 'unescape' See Question&Answers more detail:os...

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javascript - Convert array of objects to array of arrays

var json = [{one: "text1", two: "text2", three: 3, four: 4}, {one: "text3", two: "text4", three: 5, ... it easily? If not a for loop might do. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What am I allowed to do with a static, constexpr, in-class initialized data member?

This is probably a bit of an unusual question, in that it asks for a fuller explanation of a short answer ... you can in-class initialize it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - SQL Query Where Column = '' returning Emoji characters 🎃 and 🍰

Ok so I have a table with three columns: Id, Key, Value I would like to delete all rows where Value ... table name really is [Imaging.ImageTag] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calculate a*a mod n without overflow

I need to calculate a*a mod n but a is fairly large, resulting in overflow when I square it. Doing ((a ... there's no pattern to these numbers. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jsf 2 - How to reset input fields in a form after validation fail when updating it with new values

I'm using JSF 2 with PrimeFaces 4.0. I have a form with some inputs and validation. Some fields may ... from dialog? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - Why aren't my bootstrap 4 columns the same height?

I'm just learning bootstrap 4. The columns are supposed to be the same height, but that's not working out. ... What am I missing? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Return rows in the exact order they were inserted

I have a simple join table with two id columns in SQL Server. Is there any way to select all rows in the exact ... an ORDER BY, isn't it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How can I convert a string to either int or float with priority on int?

I couldn't find another answer when I wanted this, so I thought I would post my own solution for anyone ... a kind of convention for myself. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Keras import error Nadam

I am getting an import error when trying to import the Keras module Nadam: >>> from keras.optimizers import Nadam ... So it's a path issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What does it mean to run PHP in quiet mode?

You can run PHP with the -q command line switch. The manual only say: Quiet-mode. Suppress HTTP header ... actually mean in practical terms? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby - Parsing a date that can be in several formats in python

I would like to parse a date that can come in several formats, that I know beforehand. If I could not parse, ... I do the same thing in Python? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jQuery-Select list option hover

I want to alert an option when the mouse-cursor is over it. I use this code: $("select > option").hover( ... Can someone give me a hint please? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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