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Logical operators for boolean indexing in Pandas
...s np.logical_and
or has np.logical_or
not has np.logical_not
numpy.logical_xor which has no Python equivalent but is a logical "exclusive or" operation
So, essentially, one should use (assuming df1 and df2 are pandas DataFrames):
np.logical_and(df1, df2)
np.logical_or(df1, df2)
np.logical_not(df...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...k I see it. That seems to interact rather oddly with my definition of the Xor type… I'll have to think about that. Thanks!
– Antal Spector-Zabusky
Jun 3 '10 at 22:54
...
Can I catch multiple Java exceptions in the same catch clause?
...
XOR sign ( I ) is not the same as OR ( || ), A | B means either A or B but not both A || B means either A or B or both so as for exceptions it is either exceptionA or exceptionB but not both at the same time. this is why the...
Code Golf - π day
...: 490 chars
mov si,80h
mov cl,[si]
jcxz ret
mov bx,10
xor ax,ax
xor bp,bp
dec cx
a:mul bx
mov dl,[si+2]
sub dl,48
cmp dl,bl
jae ret
add ax,dx
inc si
loop a
mov dl,al
inc dl
mov dh,al
add dh,dh
mov ch,dh
mul al
mov...
CoInitialize浅析一 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...c_76A0B8C7
769AEF72 push edi
769AEF73 xor edi, edi
769AEF75 cmp [ebp+8], edi ; 判断第一个参数是否为NULL
769AEF78 jnz loc_76A0B8D1
769AEF7E
769AEF7Eloc_769AEF7E:
769AEF7E call ?IsRu...
How does the Comma Operator work
...following syntax possible and meaningful:
keywords = "and", "or", "not", "xor";
Notice that due to operator precedence, the code is (intentionally!) identical to
(((keywords = "and"), "or"), "not"), "xor";
That is, the first operator called is keywords.operator =("and") which returns a proxy o...
How to encrypt String in Java
...ret key can be easily recovered by an attacker using 2 encrypted messages. XOR 2 encrypted messages and you get the key. That simple!
Pointed out by Moussa
I am using Sun's Base64Encoder/Decoder which is to be found in Sun's JRE, to avoid yet another JAR in lib. That's dangerous from point of usin...
Two-way encryption: I need to store passwords that can be retrieved
...s to store passwords in encrypted way, I would suggest you to use a simple XOR Cipher. The main problem with this algorithm is that it could be easily broken by frequency analysis. However as generally passwords are not made from long paragraphs of English text I don't think you should worry about i...
C++ unordered_map using a custom class type as the key
...arting point for a hash function is one that uses bit shifting and bitwise XOR to combine the individual hash values. For example, assuming a key-type like this:
struct Key
{
std::string first;
std::string second;
int third;
bool operator==(const Key &other) const
{ return (f...
How do I set a textbox's text to bold at run time?
... = new Font( r.SelectionFont, r.SelectionFont.Style ^ FontStyle.Bold ); // XOR will toggle
return true;
}
if ( keyData == ( Keys.Control | Keys.U ) )
{
r.SelectionFont = new Font( r.SelectionFont, r.SelectionFont.Style ^ FontStyle.Underline ); // XO...