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Comparing two dataframes and getting the differences
...f.reindex(idx)
Date Fruit Num Color
9 2013-11-25 Orange 8.6 Orange
8 2013-11-25 Apple 22.1 Red
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Most efficient way to reverse a numpy array
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stevehasteveha
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How to modify memory contents using GDB?
...gram variable (see GDB: assignment):
(gdb) l
6 {
7 int i;
8 struct file *f, *ftmp;
9
(gdb) set variable i = 10
(gdb) p i
$1 = 10
Or you can just update arbitrary (writable) location by address:
(gdb) set {int}0x83040 = 4
There's more. Read the manual.
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Rails migration: t.references with alternative name?
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You can do this all in the initial migration/column definition (at least currently in Rails 5):
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Convert timedelta to total seconds
...datetime
>>> datetime.timedelta(seconds=24*60*60).total_seconds()
86400.0
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Convert Dictionary to semicolon separated string in c#
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edited Dec 2 '19 at 8:37
Mahdi-Malv
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Integrate ZXing in Android Studio
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edited May 4 '18 at 4:11
Faysal Ahmed
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What is the difference between gsub and sub methods for Ruby Strings
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answered Jul 20 '11 at 18:48
Ray ToalRay Toal
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How can I get the current network interface throughput statistics on Linux/UNIX? [closed]
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Mehrdad AfshariMehrdad Afshari
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How to install Java SDK on CentOS?
...this, the lastest available version may be different.
java-1.7.0-openjdk.x86_64
The above package alone will only install JRE. To also install javac and JDK, the following command will do the trick:
$ yum install java-1.7.0-openjdk*
These packages will be installing (as well as their dependenc...