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How do you run multiple programs in parallel from a bash script?
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psmearspsmears
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Java 8 NullPointerException in Collectors.toMap
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13 Answers
13
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Can you do greater than comparison on a date in a Rails 3 search?
I have this search in Rails 3:
4 Answers
4
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Gem::LoadError for mysql2 gem, but it's already in Gemfile
...ith rails 4.1.5) try using this version of mysql2:
gem 'mysql2', '~> 0.3.18'
Apparently mysql2 isn't still compatible with newer version of rails because rails 4.2.4 is pretty new as the time of answering this question by me 8 September 2015 so use the above line in your Gem file and run:
bu...
Determining complexity for recursive functions (Big O notation)
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362
The time complexity, in Big O notation, for each function:
int recursiveFun1(int n)
{
if ...
Access lapply index names inside FUN
...uments to the function, so the following works:
x <- list(a=11,b=12,c=13) # Changed to list to address concerns in commments
lapply(seq_along(x), function(y, n, i) { paste(n[[i]], y[[i]]) }, y=x, n=names(x))
Here I use lapply over the indices of x, but also pass in x and the names of x. As you...
Pandas DataFrame Groupby two columns and get counts
...).reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
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How to read and write excel file
I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?
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Convert bytes to a string
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3949
You need to decode the bytes object to produce a string:
>>> b"abcde"
b'abcde'
# u...
Difference between & and && in Java? [duplicate]
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389
& is bitwise.
&& is logical.
& evaluates both sides of the operation.
&&a...