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Salting Your Password: Best Practices?
...mantics. Pick a different salt per password, a long salt, and include odd characters in it like symbols and ASCII codes: ©¤¡
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What is pseudopolynomial time? How does it differ from polynomial time?
...mon intuition for polynomial time is "time O(nk) for some k." For example, selection sort runs in time O(n2), which is polynomial time, while brute-force solving TSP takes time O(n · n!), which isn't polynomial time.
These runtimes all refer to some variable n that tracks the size of the input. Fo...
Annotating text on individual facet in ggplot2
...t;% gather("Vars","Data_1"),
Data2 %>% gather("Vars","Data_2")
) %>% select(-Vars1) -> Data_combined
Data_combined %>%
group_by(Vars) %>%
summarise(r=cor(Data_1,Data_2),
r2=r^2,
p=(pt(abs(r),nrow(.)-2)-pt(-abs(r),nrow(.)-2))) %>%
mutate(rlabel=paste(...
Mix Razor and Javascript code
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use backticks or ctrl + k after selecting code to format it
– Suraj Rao
Nov 26 '18 at 11:23
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Why do most C developers use define instead of const? [duplicate]
...s is actually my preference in such a case.
enum { FIELD_WIDTH = 16384 };
char buf[FIELD_WIDTH];
In C++ this is a huge advantage as you can scope your enum in a class or namespace, whereas you cannot scope a #define.
In C you don't have namespaces and cannot scope an enum inside a struct, and am...
Select datatype of the field in postgres
...tion_schema (8.4 docs referenced here, but this is not a new feature):
=# select column_name, data_type from information_schema.columns
-# where table_name = 'config';
column_name | data_type
--------------------+-----------
id | integer
default_printer_id | integer
mast...
Selecting/excluding sets of columns in pandas [duplicate]
...e to create views or dataframes from an existing dataframe based on column selections.
9 Answers
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Populating a ListView using an ArrayList?
...; arg0, View v,int position, long arg3)
{
String selectedmovie=movies.get(position);
Toast.makeText(getApplicationContext(), "Movie Selected : "+selectedmovie, Toast.LENGTH_LONG).show();
}
});
}
void getmovies()
{
mov...
Xcode variables
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Ok, so when I use char* cv = getenv("CURRENT_VARIANT"); I get NULL. What am I missing?
– Brooks
Dec 31 '13 at 16:06
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Count table rows
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SELECT COUNT(*) FROM fooTable;
will count the number of rows in the table.
See the reference manual.
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