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ValueError: math domain error
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Your code is doing a log of a number that is less than or equal to zero. That's mathematically undefined, so Python's log function raises an exception. Here's an example:
>>> from math import log
>>> log(-1)
Traceback (most recent call last):
File "<pyshel...
Send string to stdin
... above is the same as
cat <<EOF
This is coming from the stdin
EOF
or you can redirect output from a command, like
diff <(ls /bin) <(ls /usr/bin)
or you can read as
while read line
do
echo =$line=
done < some_file
or simply
echo something | read param
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Determine the line of code that causes a segmentation fault?
...;
(gdb) backtrace
<offending code is shown here>
Here is a nice tutorial to get you started with GDB.
Where the segfault occurs is generally only a clue as to where "the mistake which causes" it is in the code. The given location is not necessarily where the problem resides.
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Real world example about how to use property feature in python?
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Other examples would be validation/filtering of the set attributes (forcing them to be in bounds or acceptable) and lazy evaluation of complex or rapidly changing terms.
Complex calculation hidden behind an attribute:
class PDB_Calculator(object):
...
@property
def protein_foldin...
Unzip a file with php
I want to unzip a file and this works fine
12 Answers
12
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arrow operator (->) in function heading
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In C++11, there are two syntaxes for function declaration:
return-type identifier ( argument-declarations... )
and
auto identifier ( argument-declarations... ) -> return_type
They are equivalent. Now when they are equivalent, why do you...
git: Apply changes introduced by commit in one repo to another repo
...but the latter is some kind of other branch ( repo1 is not maintained anymore).
4 Answers
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Change priorityQueue to max priorityqueue
I have priority queue in Java of Integers:
16 Answers
16
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When editing Microsoft Office VBA, how can I disable the popup “Compile error” messages?
When you're editing a Microsoft Office VBA macro or function, you will often move your cursor from a line that you haven't finished. For example, to go copy something you want to paste into that line. But, if that partial line isn't syntactically valid, the VBA editor interrupts your work by poppi...
How to call asynchronous method from synchronous method in C#?
...hat's not possible.
I have written a few types in my Nito.AsyncEx library for dealing with a partially-asynchronous code base. There's no solution that works in every situation, though.
Solution A
If you have a simple asynchronous method that doesn't need to synchronize back to its context, then you...