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What is more efficient? Using pow to square or just multiply it with itself?
...nce errno is a global, thread safety requires that it call pow to possibly set errno multiple times... exp=1 and exp=2 are fast because the pow call is hoisted out of the loop with just -O3.. (with -ffast-math, it does the sum-of-8 outside the loop, too.)
– Peter Cordes
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Is it possible to create a remote repo on GitHub from the CLI without opening browser?
...me=reponame. Your API Token can be found on the GitHub site, click Account Settings, look for Administrative Information and API Token (32 character long string).
– anddoutoi
Mar 11 '10 at 20:58
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How to add a button dynamically in Android?
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Button myButton = new Button(this);
myButton.setText("Push Me");
LinearLayout ll = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ll.addView(myButton, lp);
Have a look to this e...
#pragma pack effect
...operations are carried out in hardware, but you still get roughly the same set of operations and slowdown.
– Jerry Coffin
Jan 12 '16 at 16:12
add a comment
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Automatically capture output of last command into a variable using Bash?
...AND='LAST="`cat /tmp/x`"; exec >/dev/tty; exec > >(tee /tmp/x)'
Set this bash environmental variable and issues commands as desired. $LAST will usually have the output you are looking for:
startide seth> fortune
Courtship to marriage, as a very witty prologue to a very dull play.
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Is it better in C++ to pass by value or pass by constant reference?
...the new value of g.i from memory.
For more pratical rules, here is a good set of rules found in Move Constructors article (highly recommended reading).
If the function intends to change the argument as a side effect, take it by non-const reference.
If the function doesn't modify its argument and...
Determine if Python is running inside virtualenv
..._prefix.
Using the VIRTUAL_ENV environment variable is not reliable. It is set by the virtualenv activate shell script, but a virtualenv can be used without activation by directly running an executable from the virtualenv's bin/ (or Scripts) directory, in which case $VIRTUAL_ENV will not be set. Or ...
How do I disable a jquery-ui draggable?
...ption specified.
$( ".selector" ).draggable({ disabled: true });
Get or set the disabled option, after init.
//getter
var disabled = $( ".selector" ).draggable( "option", "disabled" );
//setter
$( ".selector" ).draggable( "option", "disabled", true );
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Python Pandas: Get index of rows which column matches certain value
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Simple way is to reset the index of the DataFrame prior to filtering:
df_reset = df.reset_index()
df_reset[df_reset['BoolCol']].index.tolist()
Bit hacky, but it's quick!
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How do I perform an IF…THEN in an SQL SELECT?
...these limitations (for example, a need to return differently shaped result sets dependent on some condition) then SQL Server does also have a procedural IF keyword.
IF @IncludeExtendedInformation = 1
BEGIN
SELECT A,B,C,X,Y,Z
FROM T
END
ELSE
BEGIN
SELECT A,B,C
FROM ...