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Pointers in C: when to use the ampersand and the asterisk?
...hem as pointers, you'll be using * to get at the values inside of them as explained above, but there is also another, more common way using the [] operator:
int a[2]; // array of integers
int i = *a; // the value of the first element of a
int i2 = a[0]; // another way to get the first element
To...
How to debug a bash script? [closed]
...there any way to debug a bash script? E.g something that prints a sort of execution log like "calling line 1", "calling line 2" etc.
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Extract first item of each sublist
I am wondering what is the best way to extract the first item of each sublist in a list of lists and append it to a new list. So if I have:
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How to get item's position in a list?
I am iterating over a list and I want to print out the index of the item if it meets a certain condition. How would I do this?
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printf() formatting for hex
...ore of a curious query than an important question, but why when printing hex as an 8 digit number with leading zeros, does this %#08X Not display the same result as 0x%08X ?
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What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
Following links explain x86-32 system call conventions for both UNIX (BSD flavor) & Linux:
4 Answers
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boolean in an if statement
...ue === true)
This will only satisfy the if condition if booleanValue is exactly equal to true. No other truthy value will satisfy it.
On the other hand if you do this:
if (someVar == true)
Then, what Javascript will do is type coerce true to match the type of someVar and then compare the two ...
What's the scope of a variable initialized in an if statement?
...a function, class, or module.
(Implicit functions defined by a generator expression or list/set/dict comprehension do count, as do lambda expressions. You can't stuff an assignment statement into any of those, but lambda parameters and for clause targets are implicit assignment.)
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How to delete multiple values from a vector?
...t 11:22
cbeleites unhappy with SXcbeleites unhappy with SX
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Setting different color for each series in scatter plot on matplotlib
...rt numpy as np
import matplotlib.pyplot as plt
import matplotlib.cm as cm
x = np.arange(10)
ys = [i+x+(i*x)**2 for i in range(10)]
colors = cm.rainbow(np.linspace(0, 1, len(ys)))
for y, c in zip(ys, colors):
plt.scatter(x, y, color=c)
Or you can make your own colour cycler using itertools.cy...