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What is the smallest possible valid PDF?
... you can start off with this:
%PDF-1.0
1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj 2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj 3 0 obj<</Type/Page/MediaBox[0 0 3 3]>>endobj
xref
0 4
0000000000 65535 f
0000000010 00000 n
0000000053 00000 n
0000000102 00000 n
t...
How does the HyperLogLog algorithm work?
...own prefix, there is a higher chance that the cardinality of the stream is 2^(size of the prefix).
That is, in a random stream of integers, ~50% of the numbers (in binary) starts with "1", 25% starts with "01", 12,5% starts with "001". This means that if you observe a random stream and see a "001",...
How can I confirm a database is Oracle & what version it is using SQL?
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288
Run this SQL:
select * from v$version;
And you'll get a result like:
BANNER
----------...
Iterate a list with indexes in Python
... 19] and makes it into iterable list of tuples, like so: [(0,3), (1,7), (2,19)] to use it instead of:
6 Answers
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Rename specific column(s) in pandas
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edited May 23 '17 at 12:34
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answered Nov 3 '13 at 21:32
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What is the preferred syntax for defining enums in JavaScript?
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What is the difference between range and xrange functions in Python 2.X?
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28 Answers
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App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
... ω²向心力a = r · ω² = v²/r向心加速度v = r · ω线速度T = 2π/ω = 2πr/v周期
需要探究的三个关系
关系固定量变量预期结论F vs ωm, r 固定ω 变化F ∝ ω²（二次函数）F vs rm, ω 固定r 变化F ∝ r（正比）F vs mr, ω 固定m 变化F ∝ m（正...
How to get size of mysql database?
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1221
Run this query and you'll probably get what you're looking for:
SELECT table_schema "DB Name"...
Naming returned columns in Pandas aggregate function? [duplicate]
...())
# height age Seed
# 1 4.51 3 301
# 15 10.89 5 301
# 29 28.72 10 301
# 43 41.74 15 301
# 57 52.70 20 301
df = data.groupby('Seed').agg(
{'age':['sum'],
'height':['mean', 'std']})
print(df.head())
# age height
# sum std ...