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Time complexity of Sieve of Eratosthenes algorithm
... space complexity is O(n). Shouldn't that be theta of n because we need an array of n elements in any case?
– a_123
Mar 25 '16 at 21:35
...
Reading a binary file with python
...ince I don't know Fortran):
import binaryfile
def particle_file(f):
f.array('group_ids') # Declare group_ids to be an array (so we can use it in a loop)
f.skip(4) # Bytes 1-4
num_particles = f.count('num_particles', 'group_ids', 4) # Bytes 5-8
f.int('num_groups', 4) # Bytes 9-12...
Possible to make labels appear when hovering over a point in matplotlib?
...p.random.seed(1)
x = np.random.rand(15)
y = np.random.rand(15)
names = np.array(list("ABCDEFGHIJKLMNO"))
c = np.random.randint(1,5,size=15)
norm = plt.Normalize(1,4)
cmap = plt.cm.RdYlGn
fig,ax = plt.subplots()
sc = plt.scatter(x,y,c=c, s=100, cmap=cmap, norm=norm)
annot = ax.annotate("", xy=(0,...
Process all arguments except the first one (in a bash script)
... least bash 4) using set -- "${@:#}" where # is the starting number of the array element we want to preserve forward:
#!/bin/bash
someVar="${1}"
someOtherVar="${2}"
set -- "${@:3}"
input=${@}
[[ "${input[*],,}" == *"someword"* ]] && someNewVar="trigger"
echo -...
Why must wait() always be in synchronized block
...d of waiting for the monitor to enter it. Moreover, when e.g. accessing an array without a synchronized block, another thread may not see the changement to it...actually another thread will not see any changements to it when it already has a copy of the array in the x-level cache (a.k.a. 1st/2nd/3rd...
Proper stack and heap usage in C++?
...ensible compilers, to allocate non-fixed size objects on the heap (usually arrays whose size is not known at compile time).
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Variable number of arguments in C++?
...er of arguments is great for debug or for functions/methods that fill some array. Also it's great for many mathematical operations, such as max, min, sum, average... It's not mess when you don't mess with it.
– Tomáš Zato - Reinstate Monica
Dec 5 '14 at 20:49...
Best practice multi language website
...ile or from DB all data at once. And than just read requested strings from array.
If you need to implement online tool to translate interface you can have all that data in DB but than still save all data to file to work with it. To reduce amount of data in memory you can split all your translated m...
How can I hash a password in Java?
...6];
random.nextBytes(salt);
KeySpec spec = new PBEKeySpec("password".toCharArray(), salt, 65536, 128);
SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
byte[] hash = f.generateSecret(spec).getEncoded();
Base64.Encoder enc = Base64.getEncoder();
System.out.printf("salt: %s%n",...
Set Colorbar Range in matplotlib
...Y) )
data1 = np.clip(data,0,6)
data2 = np.clip(data,-6,0)
vmin = np.min(np.array([data,data1,data2]))
vmax = np.max(np.array([data,data1,data2]))
fig = plt.figure()
ax = fig.add_subplot(131)
mesh = ax.pcolormesh(data, cmap = cm)
mesh.set_clim(vmin,vmax)
ax1 = fig.add_subplot(132)
mesh1 = ax1.pcolor...