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Why does multiprocessing use only a single core after I import numpy?
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ali_mali_m
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How to get the first column of a pandas DataFrame as a Series?
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edited Oct 23 '18 at 8:32
answered Mar 12 '13 at 13:33
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Filter rows which contain a certain string
....90 2.620 16.46 0 1 4 4 Mazda RX4
2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 Mazda RX4 Wag
3 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 Toyota Corolla
4 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 Toyota Corona
If you would like to do it the other way rou...
Converting a double to an int in C#
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JonJon
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Is the sizeof(some pointer) always equal to four?
...size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there's nothing to be gained in relying on a given size.
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PHP regular expressions: No ending delimiter '^' found in
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edited Jan 8 '11 at 17:09
answered Jan 8 '11 at 17:04
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Go to first line in a file in vim?
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418
In command mode (press Esc if you are not sure) you can use:
gg,
:1,
1G,
or 1gg.
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MySQL's now() +1 day
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answered Oct 8 '10 at 3:34
Mark ByersMark Byers
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How do you specify the Java compiler version in a pom.xml file?
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Oh, and: don't use Java 1.3.x, current versions are Java 1.7.x or 1.8.x
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How to add a new row to an empty numpy array
...2,3*i+3])
.....: l = np.asarray(l)
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1000 loops, best of 3: 1.18 ms per loop
In [211]: %%timeit
.....: a = np.empty((0,3), int)
.....: for i in xrange(1000):
.....: a = np.append(a, 3*i+np.array([[1,2,3]]), 0)
.....:
100 loops, best of 3: 18.5 ms per loop
In [214]: np....