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Complex numbers usage in python [closed]
...u can use the type as a constructor if you prefer:
>>> complex(2,3)
(2+3j)
A complex number has some built-in accessors:
>>> z = 2+3j
>>> z.real
2.0
>>> z.imag
3.0
>>> z.conjugate()
(2-3j)
Several built-in functions support complex numbers:
>>...
Installed Ruby 1.9.3 with RVM but command line doesn't show ruby -v
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3 Answers
3
Active
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Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib
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379
I was getting the exact same error, but the above answers didn't work for me. I had to reinsta...
Get PostGIS version
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334
Since some of the functions depend on other libraries like GEOS and proj4 you might want to ge...
Java how to replace 2 or more spaces with single space in string and delete leading and trailing spa
... String[] tests = {
" x ", // [x]
" 1 2 3 ", // [1 2 3]
"", // []
" ", // []
};
for (String test : tests) {
System.out.format("[%s]%n",
test.replaceAll("^ +| +$|( )+", "$1")
);
}
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Naming returned columns in Pandas aggregate function? [duplicate]
...data('Loblolly')
print(data.head())
# height age Seed
# 1 4.51 3 301
# 15 10.89 5 301
# 29 28.72 10 301
# 43 41.74 15 301
# 57 52.70 20 301
df = data.groupby('Seed').agg(
{'age':['sum'],
'height':['mean', 'std']})
print(df.head())
# age height ...
range() for floats
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answered Sep 1 '11 at 7:36
kichikkichik
26.2k22 gold badges7575 silver badges9292 bronze badges
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How do I list all versions of a gem available at a remote site?
...c --remote --all
Which returns:
*** REMOTE GEMS ***
rhc (0.84.15, 0.84.13, 0.83.9, 0.82.18, 0.81.14, 0.80.5, 0.79.5, 0.77.8, 0.75.9, 0.74.6, 0.74.5, 0.73.14, 0.72.29, 0.71.2, 0.69.6, 0.69.3, 0.68.5)
rhcp (0.2.18, 0.2.17, 0.2.16, 0.2.15, 0.2.14, 0.1.9, 0.1.8, 0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1...
java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
...amcrest-all-X.X.jar to your classpath.
Latest version as of Feb 2015 is 1.3:
http://code.google.com/p/hamcrest/downloads/detail?name=hamcrest-all-1.3.jar&can=2&q=
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Python Empty Generator Function
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135
You can use return once in a generator; it stops iteration without yielding anything, and thus ...