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What is the performance cost of having a virtual method in a C++ class?
...ew Grant
55.8k2222 gold badges126126 silver badges139139 bronze badges
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What are the differences between a multidimensional array and an array of arrays in C#?
... implementation they are not.
23.084 16.634 15.215 15.489 14.407 13.691 14.695 14.398 14.551 14.252
25.782 27.484 25.711 20.844 19.607 20.349 25.861 26.214 19.677 20.171
5.050 5.085 6.412 5.225 5.100 5.751 6.650 5.222 6.770 5.305
The first row are timings ...
Error in finding last used cell in Excel with VBA
...o cells with data in the worksheet then .Find will give you Run Time Error 91: Object Variable or With block variable not set
With Sheets("Sheet1")
If Application.WorksheetFunction.CountA(.Cells) <> 0 Then
lastrow = .Cells.Find(What:="*", _
After:=.Range("A1"...
Exporting functions from a DLL with dllexport
...spec(dllexport) to define exports(http://msdn.microsoft.com/en-us/library/d91k01sh.aspx). I have no idea why this works, but it does
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What's the equivalent of use-commit-times for git?
... 2,495 updated files
wine
# 13.53 seconds
# 443,979 log lines processed
# 91,703 commits evaluated
# 6,005 updated files
linux kernel
# 59.11 seconds
# 1,484,567 log lines processed
# 313,164 commits evaluated
# 40,902 updated files
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Difference between 3NF and BCNF in simple terms (must be able to explain to an 8-year old)
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91
The subtle difference is that 3NF makes a distinction between key and non-key attributes (also ...
Homebrew install specific version of formula?
...ql
postgresql
homebrew/versions/postgresql8 homebrew/versions/postgresql91
homebrew/versions/postgresql9 homebrew/versions/postgresql92
We can simply install it by typing
$ brew install homebrew/versions/postgresql8
Cloning into '/usr/local/Library/Taps/homebrew-versions'...
remote: Countin...
水果vs蔬菜智能分类器 - EdgeML图像识别项目 · App Inventor 2 中文网
...款 搜索 水果vs蔬菜智能分类器 - EdgeML图像识别项目
水果vs蔬菜智能分类器创意项目
项目信息
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Is R's apply family more than syntactic sugar?
...me(z <- lapply(y, foo))
# user system elapsed
# 2.89 0.00 2.91
system.time(z <- vapply(y, foo, numeric(1)))
# user system elapsed
# 1.35 0.00 1.36
Jan. 1, 2020 update:
system.time({z1 <- numeric(1e6); for(i in seq_along(y)) z1[i] <- foo(y[i])})
# user syst...
What is the most efficient/elegant way to parse a flat table into a tree?
...
Leniel Maccaferri
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answered Dec 22 '10 at 4:31
bobobobobob...