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Compare two DataFrames and output their differences side-by-side
...ny(1)
In [22]: ne
Out[22]:
0 False
1 True
2 True
dtype: bool
Then we can see which entries have changed:
In [23]: ne_stacked = (df1 != df2).stack()
In [24]: changed = ne_stacked[ne_stacked]
In [25]: changed.index.names = ['id', 'col']
In [26]: changed
Out[26]:
id col
1 score ...
How do I undo 'git add' before commit?
...ime of git add you want to recover (61/3AF3... -> object id 613AF3...), then git cat-file -p <object-id> (might be worth it to recover several hours of work but also a lesson to commit more often...)
– Peter Schneider
Jul 31 '17 at 14:03
...
Running Composer returns: “Could not open input file: composer.phar”
...tcomposer.org/installer | php
$ mv composer.phar /usr/local/bin/composer
Then it's likely that you, like me, ran those commands and didn't read the next part of the page telling you to stop referring to composer.phar by its full name and abbreviate it as an executable (that you just renamed with t...
iOS app error - Can't add self as subview
...sh.
If this is indeed your problem and you wish to turn animation back ON, then the correct strategy is to implement the UINavigationControllerDelegate protocol.
This includes the following method, which is called after the animation is complete:
navigationController:didShowViewController:animated:...
Unix command to find lines common in two files
... so... sort abc > abc.sorted, sort dev > def.sorted and then comm -12 abc.sorted def.sorted ?
– Nikana Reklawyks
Nov 1 '17 at 1:28
1
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Counting inversions in an array
... A[i] > A[j] . I'm using merge sort and copying array A to array B and then comparing the two arrays, but I'm having a difficult time seeing how I can use this to find the number of inversions. Any hints or help would be greatly appreciated.
...
Initial bytes incorrect after Java AES/CBC decryption
...g cipher. (One could argue that if the IV could be extracted from the key, then it would be of no use, as the key is already given to the cipher instance during its init phase).
Therefore, you should get the IV as a byte[] from the cipher instance at the end of your encryption
cipherOutputStream...
Why does ConcurrentHashMap prevent null keys and values?
... @benez Optional is a Java 8 feature, which wasn't available back then (Java 5). You could use Optionals now, indeed.
– Bruno
Sep 18 '18 at 15:02
...
In Unix, how do you remove everything in the current directory and below it?
...ory itself too? You have to do mkdir <dir-to-remove> afterwards. But then any hardlink referring to that directory will be a distinct directory afterwards.
– Johannes Schaub - litb
May 4 '09 at 16:44
...
Getting the current Fragment instance in the viewpager
...ViewPager.getCurrentItem());
// based on the current position you can then cast the page to the correct
// class and call the method:
if (ViewPager.getCurrentItem() == 0 && page != null) {
((FragmentClass1)page).updateList("new item");
}
return true;
Pl...