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How to invoke a Linux shell command from Java
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exec does not execute a command in your shell
try
Process p = Runtime.getRuntime().exec(new String[]{"csh","-c","cat /home/narek/pk.txt"});
instead.
EDIT::
I don't have csh on my system so I used bash instead. The following w...
What is the meaning of polyfills in HTML5?
...es, etc." It's adding this functionality via javascript which the browser does not already support.
– Calvin Froedge
Aug 17 '11 at 2:35
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Getting the count of unique values in a column in bash
...on
In an ugly contest, Perl is particularly well equipped.
This one-liner does the same:
perl -lane 'for $i (0..$#F){$g[$i]{$F[$i]}++};END{for $j (0..$#g){print "$j:";for $k (sort{$g[$j]{$b}<=>$g[$j]{$a}||$a cmp $b} keys %{$g[$j]}){print " $k $g[$j]{$k}"}}}' files*
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How is a CRC32 checksum calculated?
... thanks looks great, but how exactly do you get the polynomial value? what does X represent exactly? And when it says x^32, is that x to the power of 32, or the bitwise operator ^? stackoverflow.com/questions/62168128/…
– bluejayke
Jun 3 at 8:36
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how do you filter pandas dataframes by multiple columns
...ace & (or np.logical_or to replace |)
Here's an example function that does the job, if you provide target values for multiple fields. You can adapt it for different types of filtering and whatnot:
def filter_df(df, filter_values):
"""Filter df by matching targets for multiple columns.
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XML Validation with XSD in Visual Studio IDE
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Does your xsd contain an attribute "targetNamespace" /schema/@targetNamespace that is similar to the namespace you are referencing in the xml?
Examples:
XSD:
<xs:schema .... targetNamespace="Datafile.xsd" ... >
X...
How to copy data to clipboard in C#
... be text, files, images, any sort of custom data. The concept of kv-pairs doesn't seem to be anything to do with the clipboard idea?
– Kieren Johnstone
Jan 14 '16 at 10:31
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Resize image proportionally with MaxHeight and MaxWidth constraints
...ou don't need to save the image. This is exactly what my ScaleImage method does - returns image without saving it.
– Alex Aza
Aug 25 '16 at 7:29
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pyplot scatter plot marker size
...t be 4 ** n and 2 ** n, but n ** 4 and n ** 2. With 2 ** n the second plot does not scale linearly in terms of circle diameter. It still goes too fast (just not that much over the top).
– Tomasz Gandor
Jun 13 '19 at 11:35
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Error handling in C code
...es to indicate errors. If a function only extracts data from an object but doesn't mutate the object, then the integrity of the object itself is not at risk and indicating errors using a return value is more appropriate.
Second, it's not always appropriate to use exceptions in C++. Exceptions are g...