大约有 47,000 项符合查询结果（耗时：0.0539秒） [XML]
Map Tiling Algorithm
...ingrobert king
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Batch not-equal (inequality) operator
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answered Sep 14 '09 at 13:10
Frank BollackFrank Bollack
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Float vs Decimal in ActiveRecord
... a Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.
That's why there is a Decimal format. If you do this:
irb:001:0> "%.47f" % (1.0/10)
=> "0.10000000000000000555111512312578270...
Ant task to run an Ant target only if a file exists?
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toolkittoolkit
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8
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Inline labels in Matplotlib
... verticalalignment='center')
plt.close('all')
x = np.linspace(0, 1, 101)
y1 = np.sin(x * np.pi / 2)
y2 = np.cos(x * np.pi / 2)
y3 = x * x
plt.plot(x, y1, 'b', label='blue')
plt.plot(x, y2, 'r', label='red')
plt.plot(x, y3, 'g', label='green')
my_legend()
plt.show()
And the resulting plot:
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Interpolating a string into a regex
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Jonathan LonowskiJonathan Lonowski
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Optional Parameters with C++ Macros
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answered Jun 15 '10 at 19:28
Derek LedbetterDerek Ledbetter
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One-liner to check whether an iterator yields at least one element?
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answered Jun 24 '10 at 23:28
Jochen RitzelJochen Ritzel
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Is there an easy way to create ordinals in C#?
...(int num)
{
if( num <= 0 ) return num.ToString();
switch(num % 100)
{
case 11:
case 12:
case 13:
return num + "th";
}
switch(num % 10)
{
case 1:
return num + "st";
case 2:
return num + "nd";
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How do I round to the nearest 0.5?
... smarties
– Neil N
Aug 25 '09 at 17:10
3
Not perfect! what about integer overflow! You can comput...