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Append a NumPy array to a NumPy array
...p
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array([[9, 8, 7], [6, 5, 4]])
In [4]: np.concatenate((a, b))
Out[4]:
array([[1, 2, 3],
[4, 5, 6],
[9, 8, 7],
[6, 5, 4]])
or this:
In [1]: a = np.array([1, 2, 3])
In [2]: b = np.array([4, 5, 6])
In [3]: np.vst...
@try - catch block in Objective-C
... iTuxiTux
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Node.js - Find home directory in platform agnostic way
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edited Jun 8 '18 at 13:56
answered Jan 31 '12 at 14:43
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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
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edited Feb 8 '18 at 3:30
OneCricketeer
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How can I change the default Django date template format?
I have dates in ISO 8601 format in the database, %Y-%m-%d . However, when the date is passed on to the template, it comes out as something like Oct. 16, 2011 .
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How do I ALTER a PostgreSQL table and make a column unique?
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I figured it out from the PostgreSQL docs, the exact syntax is:
ALTER TABLE the_table ADD CONST...
warning: implicit declaration of function
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@Flimm, C99 and C89/C90 has different setting for this
– How Chen
Jan 15 '15 at 6:06
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Order discrete x scale by frequency/value
...different than:
# mtcars$cyl2 <- factor(mtcars$cyl, levels = c("6","4","8"))
# You can manually set the levels in whatever order you please.
ggplot(mtcars, aes(cyl2)) + geom_bar()
As James pointed out in his answer, reorder is the idiomatic way of reordering factor levels.
mtcars$cyl3 <-...
MySQL: What's the difference between float and double?
...get rounded and decimals do not. Decimal(9,3) could be for example 123456.789 whereas if you tried to store 123456.789 it would get inserted as 123456.0 as a float.
– Blake
Mar 6 '18 at 20:18
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