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Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
... arraySize; ++c)
if (data[c] >= 128)
for (int i = 0; i < 100000; ++i)
sum += data[c];
into
for (int c = 0; c < arraySize; ++c)
if (data[c] >= 128)
sum += 100000 * data[c];
because the latter could lead to overflow of signed integers where the form...
Adding images or videos to iPhone Simulator
...ary/Developer/CoreSimulator/Devices/[Simulator Identifier]/data/Media/DCIM/100APPLE
and add IMG_nnnn.THM and IMG_nnnn.JPG. You will then need to reset your simulator (Hardware->Reboot) to allow it to notice the new changes. It doesn't matter if they are not JPEGs - they can both be PNGs, but it ...
多媒体组件 · App Inventor 2 中文网
...件
设置音频源文件。
音量
将音量属性设置为 0 到 100 之间的数字。小于 0 的值将被视为 0，大于 100 的值将被视为 100。
事件
已播放完成时()
表示媒体播放已结束。
其他播放器启动时()
当另一个播放器开始播放时...
Bill Gross超火爆演讲: 创业成功唯一最关键因素 - 资讯 - 清泛网 - 专注C/C++及内核技术
...deaLab。本文为你带来其演讲的整理，一起看看这个折腾出100家公司的创业奇才，对创业有什么要说的。
▼Bill Gross和他的Idealab可称为网络创业领域的始祖
真正让我吃惊的是，到底是哪些因素在造就创业公司能否成功，我很高兴...
How do I calculate a point on a circle’s circumference?
... return [ x, y ];
}
Usage:
const [ x, y ] = pointsOnCircle({ radius: 100, angle: 180, cx: 150, cy: 150 });
console.log( x, y );
Codepen
/**
* Calculate x and y in circle's circumference
* @param {Object} input - The input parameters
* @param {number} input.radius - The circle's ra...
How to make a great R reproducible example
...
Example:
# sample data
DF <- data.frame(id=rep(LETTERS, each=4)[1:100], replicate(100, sample(1001, 100)), Class=sample(c("Yes", "No"), 100, TRUE))
DF is about 100 x 102. I want to sample 10 rows, and a few specific columns
reproduce(DF, cols=c("id", "X1", "X73", "Class")) # I could al...
Center image in div horizontally [duplicate]
...ide image" />
</div>
</div>
CSS
img
{
max-width: 100%;
max-height: 100%;
display: block;
margin: auto auto;
}
.outer
{
border: 1px solid #888;
width: 100px;
height: 100px;
}
.inner
{
display:table-cell;
height: 100px;
width: 100px;
...
How to get indices of a sorted array in Python
...
Something like next:
>>> myList = [1, 2, 3, 100, 5]
>>> [i[0] for i in sorted(enumerate(myList), key=lambda x:x[1])]
[0, 1, 2, 4, 3]
enumerate(myList) gives you a list containing tuples of (index, value):
[(0, 1), (1, 2), (2, 3), (3, 100), (4, 5)]
You sor...
Canvas width and height in HTML5
...fff; border:1px solid #ccc; width:400px; height:160px }
<canvas width="100" height="40"></canvas>
<p>Showing that re-drawing the same antialiased lines does not obliterate old antialiased lines.</p>
...
Pass Variables by Reference in Javascript
...rvar('test_ref_number');
test_ref_number = 5;
function Fn1 (v) { v.value = 100; }
console.log("rvar('test_ref_number');");
console.log("test_ref_number = 5;");
console.log("function Fn1 (v) { v.value = 100; }");
console.log('test_ref_number.value === 5', test_ref_number.value === 5);
console.log(" "...