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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...ariable is unset or not set. REF: github.com/koalaman/shellcheck/wiki/SC2154
– Nam Nguyen
Apr 7 '15 at 4:32
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How to prevent moment.js from loading locales with webpack?
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Zeeshan Hassan Memon
6,65433 gold badges3434 silver badges5050 bronze badges
answered Aug 21 '14 at 12:09
Tobias K.Tobias K.
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Reorder levels of a factor without changing order of values
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Use the levels argument of factor:
df <- data.frame(f = 1:4, g = letters[1:4])
df
# f g
# 1 1 a
# 2 2 b
# 3 3 c
# 4 4 d
levels(df$g)
# [1] "a" "b" "c" "d"
df$g <- factor(df$g, levels = letters[4:1])
# levels(df$g)
# [1] "d" "c" "b" "a"
df
# f g
# 1 1 a
# 2 2 b
# 3 3 c
# 4 ...
How do I determine if my python shell is executing in 32bit or 64bit?
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424
One way is to look at sys.maxsize as documented here:
$ python-32 -c 'import sys;print("%x" %...
MDI CDockablePane使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...;
DockPane(&m_Panes[0]);// LEFT
DockPane(&m_Panes[1]);// BOTTOM
（4）第四种情况
if (!m_Panes[0].Create(_T("Pane 0"), this, CRect(0, 0, 200, 100), TRUE, 1000,
WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_LEFT | CBRS_FLOAT_MULTI))
{return FALSE;}
if (!m...
Problem with converting int to string in Linq to entities
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314
With EF v4 you can use SqlFunctions.StringConvert. There is no overload for int so you need to ...
How to customize the background/border colors of a grouped table view cell?
... the appropriate colors. This view needs to be able to draw the borders in 4 different modes, rounded on the top for the first cell in a section, rounded on the bottom for the last cell in a section, no rounded corners for cells in the middle of a section, and rounded on all 4 corners for sections t...
64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
64 bit OS下int占几个字节？int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的，不受编译器的影响。__int64才是8位的。另外，指针是受编译器 OS影响的，3...int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的...
Android RoundRectShape圆角矩形使用详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...gle, pass null.
//一个包含8个弧度值，指定外部圆角矩形的 4个角部的弧度及 ：new float[] {l, l, t, t, r, r, b, b};
// 前2个 左上角， 3 4 ， 右上角， 56， 右下， 78 ，左下，如果没弧度的话，传入null即可。
inset
A RectF that specifies the d...