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Abort makefile if variable not set
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279
TL;DR: Use the error function:
ifndef MY_FLAG
$(error MY_FLAG is not set)
endif
Note that ...
Python: print a generator expression?
...for example:
>>> sorted(x*x for x in range(10))
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
Basically all the other comprehensions available in Python 3 and Python 2.7 is just syntactic sugar around a generator expression. Set comprehensions:
>>> {x*x for x in range(10)}
{0, 1, 4, 81,...
Setting JDK in Eclipse
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edited Oct 21 '19 at 18:04
Manuel Jordan
10.8k1414 gold badges6060 silver badges101101 bronze badges
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CSS last-child selector: select last-element of specific class, not last child inside of parent?
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235
:last-child only works when the element in question is the last child of the container, not th...
What is a bank conflict? (Doing Cuda/OpenCL programming)
...same bank the access has to be serialized (this is a bank conflict). For gt200 gpus there are 16 banks (32banks for fermi), 16 or 32 banks for AMD gpus (57xx or higher: 32, everything below: 16)), which are interleaved with a granuity of 32bit (so byte 0-3 are in bank 1, 4-7 in bank 2, ..., 64-69 in...
Plotting time in Python with Matplotlib
...imestamps to Python datetime objects (use datetime.strptime). Then use date2num to convert the dates to matplotlib format.
Plot the dates and values using plot_date:
dates = matplotlib.dates.date2num(list_of_datetimes)
matplotlib.pyplot.plot_date(dates, values)
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Nohup is not writing log to output file
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answered Oct 16 '12 at 17:17
wulongwulong
2,50911 gold badge1818 silver badges1818 bronze badges
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How to make the 'cut' command treat same sequental delimiters as one?
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552
Try:
tr -s ' ' <text.txt | cut -d ' ' -f4
From the tr man page:
-s, --squeeze-repeats ...
How do you clear a slice in Go?
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123
It all depends on what is your definition of 'clear'. One of the valid ones certainly is:
slic...
Rails ActionMailer - format sender and recipient name/email address
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237
If you are taking user input for name and email, then unless you very carefully validate or es...