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multiprocessing.Pool: When to use apply, apply_async or map?
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Count occurrences of a char in plain text file
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answered Oct 21 '09 at 21:37
CascabelCascabel
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What is the correct way of using C++11's range-based for?
... the elements
Let's consider a simple example:
vector<int> v = {1, 3, 5, 7, 9};
for (auto x : v)
cout << x << ' ';
The above code prints the elements (ints) in the vector:
1 3 5 7 9
Now consider another case, in which the vector elements are not just simple integers,
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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...nt(const char *format,...) __attribute__((format(printf,1,2)));
//m=2；n=3
extern void myprint(int l，const char *format,...)
__attribute__((format(printf,2,3)));
需要特别注意的是，如果myprint是一个函数的成员函数，那么m和n的值可有点“悬乎”了，例如：
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Clear Text Selection with JavaScript
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answered Jul 3 '10 at 0:46
Gert GrenanderGert Grenander
15.7k66 gold badges3535 silver badges4343 bronze badges
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Generate a heatmap in MatPlotLib using a scatter data set
...matplotlib.pyplot as plt
# Generate some test data
x = np.random.randn(8873)
y = np.random.randn(8873)
heatmap, xedges, yedges = np.histogram2d(x, y, bins=50)
extent = [xedges[0], xedges[-1], yedges[0], yedges[-1]]
plt.clf()
plt.imshow(heatmap.T, extent=extent, origin='lower')
plt.show()
This m...
How to prevent http file caching in Apache httpd (MAMP)
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+50
Tried t...
How to detect user inactivity in Android
...vity extends Activity {
public static final long DISCONNECT_TIMEOUT = 300000; // 5 min = 5 * 60 * 1000 ms
private static Handler disconnectHandler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
// todo
r...
Copy all files with a certain extension from all subdirectories
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edited Jun 4 '15 at 8:23
answered Mar 25 '13 at 14:10
Br...
How to succinctly write a formula with many variables from a data frame?
... the . identifier.
y <- c(1,4,6)
d <- data.frame(y = y, x1 = c(4,-1,3), x2 = c(3,9,8), x3 = c(4,-4,-2))
mod <- lm(y ~ ., data = d)
You can also do things like this, to use all variables but one (in this case x3 is excluded):
mod <- lm(y ~ . - x3, data = d)
Technically, . means all ...