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Append a NumPy array to a NumPy array
...
In [1]: import numpy as np
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...
How to use Active Support core extensions
I have Active Support 3.0.3 installed and Rails 3.0.3 with Ruby 1.8.7.
5 Answers
5
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Appending to an empty DataFrame in Pandas?
...ata = pd.DataFrame({"A": range(3)})
>>> df.append(data)
A
0 0
1 1
2 2
But the append doesn't happen in-place, so you'll have to store the output if you want it:
>>> df
Empty DataFrame
Columns: []
Index: []
>>> df = df.append(data)
>>> df
A
0 0
1 1
2 ...
Storing R.drawable IDs in XML array
...le within your /res/values folder that looks like this:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<integer-array name="random_imgs">
<item>@drawable/car_01</item>
<item>@drawable/balloon_random_02</item>
<item>@dr...
warning: implicit declaration of function
... a declaration ("prototype") yet.
For example:
int main()
{
fun(2, "21"); /* The compiler has not seen the declaration. */
return 0;
}
int fun(int x, char *p)
{
/* ... */
}
You need to declare your function before main, like this, either directly or in a header:
int fun(int ...
How can I profile Python code line-by-line?
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120
I believe that's what Robert Kern's line_profiler is intended for. From the link:
File: pyst...
How can I count the number of matches for a regex?
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177
matcher.find() does not find all matches, only the next match.
Solution for Java 9+
long mat...
Twig: in_array or similar possible within if statement?
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edited Apr 30 '15 at 4:42
jake stayman
1,2241111 silver badges2020 bronze badges
answered Sep...
Generate a random double in a range
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241
To generate a random value between rangeMin and rangeMax:
Random r = new Random();
double rando...
cannot load such file — zlib even after using rvm pkg install zlib
I installed zlib package and ruby 1.9.3 using rvm, but whenever I try to install
gems it says
cannot load such file -- zlib
...