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Should the hash code of null always be zero, in .NET
...asked my question in the first place, because whenever we write an enum T, then (T?)null and (T?)default(T) will have the same hash code (in the current implementation of .NET). That could be changed if the implementors of .NET changed either the hash code of null or the hash code algorithm of the S...
How do you calculate the average of a set of circular data? [closed]
...the argument of c, such that cc == ab", where a and b have a modulus of 1, then the average of 0 and 180 is 90.
– David Hanak
Jan 29 '09 at 14:42
3
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How do I use su to execute the rest of the bash script as that user?
...nt-user commands as their own script. If it's just one, or a few commands, then inline should work. If it's lots of commands then it's probably best to move them to their own file.
su -c "cd /home/$USERNAME/$PROJECT ; svn update" -m "$USERNAME"
...
pandas DataFrame: replace nan values with average of columns
...ience: from a Data Science perspective it is wrong to first replace NA and then split into train and test... You MUST first split into train and test, then replace NA by mean on train and then apply this stateful preprocessing model to test, see the answer involving sklearn below!
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If table exists drop table then create it, if it does not exist just create it
...e up the backticks before and after the code segment. Single backticks are then shown verbatim.
– r3mainer
Mar 8 '16 at 19:52
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Why does changing the returned variable in a finally block not change the return value?
... is not) and the contents of the object were changed in the finally block, then those changes would be seen in the returned value.
The detailed rules for how all this operates can be found in Section 14.20.2 of the Java Language Specification. Note that execution of a return statement counts as an a...
How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess
...y the loop to store the PID of each spawned sub-process into an array, and then loop again waiting on each PID.
# run processes and store pids in array
for i in $n_procs; do
./procs[${i}] &
pids[${i}]=$!
done
# wait for all pids
for pid in ${pids[*]}; do
wait $pid
done
...
What is the explicit promise construction antipattern and how do I avoid it?
...s fails to utilize the fact that promises chain.
Promises can chain with .then and you can return promises directly. Your code in getStuffDone can be rewritten as:
function getStuffDone(param){
return myPromiseFn(param+1); // much nicer, right?
}
Promises are all about making asynchronous co...
HashMap get/put complexity
... 8, HashMap has been tweaked so that if keys can be compared for ordering, then any densely-populated bucket is implemented as a tree, so that even if there are lots of entries with the same hash code, the complexity is O(log n). That can cause issues if you have a key type where equality and orderi...
Removing an activity from the history stack
...d clear A as you launch B, and clear B as you launch C; however, I suppose then you wouldn't be able to back out from B to A if that's what you desire. I'll have to think on this more if that's a problem.
– Dan Lew
Dec 14 '09 at 14:17
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