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How to create id with AUTO_INCREMENT on Oracle?
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SYS_GUID returns a GUID-- a globally unique ID. A SYS_GUID is a RAW(16). It does not generate an incrementing numeric value.
If you want to create an incrementing numeric key, you'll want to create a sequence.
CREATE SE...
How can I convert a long to int in Java?
How can I convert a long to int in Java?
15 Answers
15
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How to get a reference to a module inside the module itself?
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import sys
current_module = sys.modules[__name__]
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Python's json module, converts int dictionary keys to strings
... that when the following is run, python's json module (included since 2.6) converts int dictionary keys to strings.
9 Answe...
Measuring function execution time in R
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Another possible way of doing this would be to use Sys.time():
start.time <- Sys.time()
...Relevent codes...
end.time <- Sys.time()
time.taken <- end.time - start.time
time.taken
Not the most elegant way to do it, compared to the answere above , but definitely a w...
Python: reload component Y imported with 'from X import Y'?
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from modulename import func
import importlib, sys
importlib.reload(sys.modules['modulename'])
from modulename import func
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How to convert 2D float numpy array to 2D int numpy array?
How to convert real numpy array to int numpy array?
Tried using map directly to array but it did not work.
4 Answers
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Using the rJava package on Win7 64 bit with R
...(at least for me). You can check easily within R is JAVA_HOME is set with
Sys.getenv("JAVA_HOME")
If you need to have JAVA_HOME set (e.g. you need it for maven or something else), you could deactivate it within your R-session with the following code before loading rJava:
if (Sys.getenv("JAVA_HO...
An efficient way to transpose a file in Bash
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$ time perl test.pl file >/dev/null
real 0m0.480s
user 0m0.442s
sys 0m0.026s
$ time awk -f test.awk file >/dev/null
real 0m0.382s
user 0m0.367s
sys 0m0.011s
$ time perl test.pl file >/dev/null
real 0m0.481s
user 0m0.431s
sys 0m0.022s
$ time awk -f test.a...
How to fix “ImportError: No module named …” error in Python?
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Python does not add the current directory to sys.path, but rather the directory that the script is in. Add /home/bodacydo/work/project to either sys.path or $PYTHONPATH.
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