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w*******9
发帖数: 1433 | 3 自己手动吧，survfit算出每个curve的值和variance,你再手动取差值，variance就是
俩variance的和，不过要注意前面的variance得是estimated survival function的
variance,因为默认不是这样的 |
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a********g
发帖数: 651 | 4 I am using survexp to calculate expect survival curve in R right now, but
found out that the real people life table in R stopped at yr 1990. after yr
1990, there is no real data for life table.
Have anybody had same issue before? how could I solve it?
Thanks a lot. |
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w*******y
发帖数: 60932 | 9 Loosk like you could get this great trimmer made by Tanaka for only $83
AFTER MAIL IN REBATE
Hitachi CG22EABSLP 21.1cc 2 Stroke Gas Powered Curved Shaft Grass Trimmer
Product Features
21.1cc commercial grade engine provides excellent performance and
reliability
S-Start reduces the amount of pull-force required to start the unit by 50%
Anti-Vibration System provides maximum comfort for getting more done with
less fatigue
4-inch semi-automatic trimmer head provides hasslefree operation and holds
1 |
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w*******y
发帖数: 60932 | 10 Dell Home
5dot Curve 16" Messenger Laptop Bag
$40 - $28 Instant Savings
= $12 with free shipping
|
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w*******y
发帖数: 60932 | 11 Dell Home
5dot Curve 16" Messenger Laptop Bag
$40 - $28 Instant Savings
= $12 with free shipping
|
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w*******y
发帖数: 60932 | 12 Amazon
Microsoft Comfort Curve Keyboard 2000
$9.99
free shipping with Amazon Prime or if you spend $25 or more
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g******y
发帖数: 2517 | 16 Microsoft Comfort Curve Keyboard 2000 (B2L-00002)，折扣35%
http://amzn.to/vzkVHN
进入页面后点右侧的"View Lightning Deal" |
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w*******y
发帖数: 60932 | 18 Microsoft Comfort Curve Keyboard 2000 for $10 @ staples + FS to store
Link:
http://iway.org/9584441
|
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f**d
发帖数: 768 | 19 这是一本计算神经科学的优秀著作，全文拷贝这里（图和公式缺），有兴趣的同学可以
阅读
如需要，我可以分享PDF文件（－－仅供个人学习，无商业用途）
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖 |
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g****g
发帖数: 1828 | 20 In probability theory, the normal (or Gaussian) distribution, is a
continuous probability distribution that is often used as a first
approximation to describe real-valued random variables that tend to cluster
around a single mean value. The graph of the associated probability density
function is “bell”-shaped, and is known as the Gaussian function or bell
curve:[nb 1]
f(x) = \tfrac{1}{\sqrt{2\pi\sigma^2}}\; e^{ -\frac{(x-\mu)^2}{2\sigma^2}
},
where parameter μ is the mean (location of the pe... 阅读全帖 |
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a******8
发帖数: 90 | 21 我的1和2区别很小啊，测试都过了。我的思路是2无非是有一些重复的，怎么去重复，
先排序，然后我手动run了几个test case,发现在某些情况下，会重复的swap,这样我从
后往前走，一旦遇到相同的数，就可以停止了，否则就是重复，有点排列组合的概念。
请各大牛验证：
比如 yyy9yyy9x 9,比如下个数是9，只需要换下x与9，进下一步，其他之前的不管了
，管了就重复了。
class Solution {
public:
void myPerm(vector &num, vector curv, int curi, vector
int> > &ret)
{
if(curi == num.size())ret.push_back(curv);
else
{
curv.push_back(num[curi]);
myPerm(num,curv,curi+1,ret);
for(int i = curv.size... 阅读全帖 |
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b******g
发帖数: 3616 | 22 这个问题其实也是我接触luminosity mask后有过的疑问。最后的结论是，配合
luminosity mask进行亮度调节的确有单纯curve,level,brightness等所达不到的效果。
1.先拿S curve来说吧，S curve的关键是找两个点，一个向上拉一个向下拉，类似表格
第一行+第三行的组合。本质上说，S curve在亮度域上还是一个全局的调整，尽管有的
亮度范围被调节的小，有的调节的大。也因此S curve有一个最大的弱点 —— 当你想
加亮和加暗的部分的亮度值比较接近时，S curve向上向下拉的两个点也会比较接近，
这个时候S curve的效果通常就会很差。
而利用LM则可以比较精确地分别选中不同亮度的区域，进行分离调整。当然你可能会问
LM又如何能够区分选中亮度接近的不同区域。这里就有很多技巧：
比如你可以先用一个S curve来做一个辅助层，来进行初步的明暗对比增加。虽然这种
增加会使画面变得很难看，但这个难看的画面可以用来建立一个很好的LM。建立完LM后
，便可以删除辅助层，然后利用LM配合S曲线来进行更为精确的明暗部分的亮度分离。
甚至可以在LM做... 阅读全帖 |
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t**********n
发帖数: 283 | 23 交流交流，谢谢。
1.关于standard curve, 我的理解就是确认PCR amplication efficiency,只要你的样
品DNA好的，为什么一定要用实际IP的
样品量（1/20, 1/200, 1/2000 and 1/2000 of ChIP input）standard curve？当然
如果模板浓度太低，amplication curve may be an issue。
我过去的经验是cDNA样品反复冻融会影响amplication efficiency.
此外如果倍数差别很大比如10倍以上的话就没有必要做standard curve，因为即使扩增
效率低也不会影响到最终结果。
我觉得对一对引物做一次就够了。
2 “qPCR本身是有每次
PCR循环的数据的。根据linear range的扩增曲线，是很容易算出primer的efficiency
的（有的软件会自动给出这个值），然后可以根据这个来定量。”
我以前想过机器应该能自动给出这个效率，但从来没见过，楼主能否说出具体的机器或
软件？
关于这个standard curve，我想探讨下。
我们老板，要求我们... 阅读全帖 |
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t******n
发帖数: 6242 | 24 今天无聊，看到这篇无聊的文章，就给你无聊地翻译成英文吧。
探索星系的捷径
A Shortcut to Galaxy Exploration
1. 问苍天情为何物？
1. Ask what love is heaven?
有人类的历史以来，人类就不断地探索自然，扩展了解自然的疆界。哥伦布发现新大陆
就是最好的例子。人类探索自然的勇气是从哪儿来的呢？来自人类情感的力量。那么，
情感是什么东西呢？这是千万年来，文学家探索的主题。在有一些文学家的眼中，物理
学家是没有情感的冷血动物。我就是一个物理学家。但是，我一点也不埋怨这些文学家
。虽然物理学家在自然界的探索中做出了伟大的贡献，但是，物理学家从来就没有给出
情感的物理定义是什么，也没有找到自然界蕴含情感的丝毫证据。所以，虽然人类知道
自己的生存发展跟自然环境是密不可分的，但是，很少有人类表达出对自然环境感谢的
情感。在很多人的眼中，自然界是死亡无情的物质世界。中国有一句古语，叫做“天若
有情天亦老”。因为几乎所有人类相信天是不老的，所以，认为苍天是没有情感的，就
不足为奇了。我提出了一个宇宙生长衰老的模型。虽然这个模型及其简单，能解释大多
... 阅读全帖 |
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D*******e
发帖数: 12862 | 25 好久没看棒球了，昨天头一回在电梯上看了几个inning - 这回是真看！不是高光 :)
结果发现全部看不懂了，最重要的原因除了人基本都不认识以外，主要是各种ball全忘
光了。。。连slider是啥都反应不过来了，真的是老年痴呆了呀。。。：（
赶紧狗了几把brush up了一下，顺便科普给广大的吃瓜群众们 ：）
大的分类：fast ball(快球，速球，直球)，breaking ball（变化球，曲线球），
changeup（变速球），飘忽球
属于fastball的有：
four seamer - 普通快球
two seamer (sinker) - 快球 + downward movement + in for RHH (right handed
hitters)
cutter - 快球 + downward + away for RHH
splitter/forkball - 快球 + more downward curves
属于breaking ball的有：
curve ball - 曲线球，上下curve
slider - 滑球，左右curve, away from RHH... 阅读全帖 |
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c****1
发帖数: 1095 | 26 关于这个standard curve，我想探讨下。
我们老板，要求我们每次qPCR，对每对primer都要用input的dilution做standard
curve。而且要用定量的input做standard curve （10, 1, 0.1, 0.01 ng/ul）然后
sample的定量就用这个standard curve。我觉得更合理的做法是，应该是根据实际IP的
样品量（1/20, 1/200, 1/2000 and 1/2000 of ChIP input）standard curve。这个问
题，跟他争论了好几次，后来就懒得跟他争了。
另外，至于就是是否需要每次都做standard curve？我觉得其实是没有必要的，甚至用
input做standard curve是完全不需要的。standard curve本身的目的就是为了计算
primer的efficiency，以方便定量。其实，模板的量，也会影响primer的efficiency，
primer对input样品的effficiency不一定跟IP样品的一样。而且，qPCR本身是有每次
PCR循环的数据的。根据li... 阅读全帖 |
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t**********m
发帖数: 205 | 27 来自主题: Mathematics版 - 伟哥之乐 The joy of viXra
https://telescoper.wordpress.com/2011/05/19/
Posted in The Universe and Stuff with tags arXiv, astronomy, Cosmology,
Physics, scientific publishing, viXra on May 19, 2011 by telescoper
From time to time on this blog I post rants about the state of scientific
publishing, open access, the importance of the arXiv for astronomy and
cosmology, and so on.
This morning, however, I discovered an “alternative” side to the whole
business of online science, a site by the name of viXra. Mos... 阅读全帖 |
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t**********m
发帖数: 205 | 28 The joy of viXra
https://telescoper.wordpress.com/2011/05/19/
Posted in The Universe and Stuff with tags arXiv, astronomy, Cosmology,
Physics, scientific publishing, viXra on May 19, 2011 by telescoper
From time to time on this blog I post rants about the state of scientific
publishing, open access, the importance of the arXiv for astronomy and
cosmology, and so on.
This morning, however, I discovered an “alternative” side to the whole
business of online science, a site by the name of viXra. Mos... 阅读全帖 |
|
d******a
发帖数: 32122 | 29 ☆─────────────────────────────────────☆
playadelrey (A smile is a curve gets things straight) 于 (Sun Jul 8 17:18:52 2012, 美东) 提到:
根据史实，报告，调查。横向对比，中共，国民党，苏联，美国。美国这边中学历史书
里面说的不知道可不可信，我国的近代史教课书可信度很低是真的，基本就是中共的意
淫史。
其实古代史也好不到哪去。。。
☆─────────────────────────────────────☆
microyu (yu) 于 (Sun Jul 8 17:21:32 2012, 美东) 提到:
现在的中共教科书要比弯弯的客观的多。毛时代的不算
☆─────────────────────────────────────☆
playadelrey (A smile is a curve gets things straight) 于 (Sun Jul 8 17:26:07 2012, 美东) 提到:
求更多史料。弯弯的教... 阅读全帖 |
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C****2
发帖数: 2904 | 30 美国国债20万亿，利率到3%，利息一年6000亿，关键是有人接手，要没人接呢？有人估
计要一万亿了，还有各种军事加大花费，修墙，还有公司大减税，美国不到两年破产。
How High Can Interest Rates Go Before National Debt Is Unsustainable?
t is a question we are all asking ourselves as the national debt approaches
$20 trillion with Donald Trump about to occupy the White House and planning
a $1 trillion infrastructure program.
Interest rates are climbing all across the yield curve having just been
exacerbated by Thursday's overnight funds rate hike by the Federal Reserve
Board. How ... 阅读全帖 |
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w****n
发帖数: 113 | 31 They are not equivalent. Shimura-Taniyama Conjecture (actually a special
case suffices), however, along with other existing results yields FLT.
A non-trivial solution to a Fermat equation x^p+y^p=z^p (*) corresponds to a
rational point (of infinite order) on an elliptic curve E that corresponds
to (*). Thus, to show that (*) has no non-trivial solutions, it suffices to
show that the curve E has (algebraic) rank 0 (ie. has no rational points of
infinite order). To an elliptic curve, there are tw... 阅读全帖 |
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c*********o
发帖数: 8367 | 32 Bonds Showing 60% Chance of Recession With Bernanke Behind Curve for BofA
Q
By Liz Capo McCormick - Oct 10, 2011 11:09 PM CT
Oct. 10 (Bloomberg) -- Scott Brown, chief economist at Raymond James &
Associates Inc., talks about the outlook for the U.S. economy. Brown also
discusses the U.S. labor market. He speaks with Mark Crumpton on Bloomberg
Television's "Bottom Line." (Source: Bloomberg)
The bond market indicator that has predicted every U.S. recession since 1970
shows that the economy has abo... 阅读全帖 |
|
H****h
发帖数: 1037 | 33 First, by mengyi, choose A on the curve and rotate the curve 60 degrees
about A, if the new curve and the old one intersect at some B!=A, let C
be the preimage of B before the rotation, then ABC is what we need.
However, not every A on the curve satisfies this property. For example,
if the curve is the boundary of some triangle, and A is one of the vertexes
with angle less than 60 degrees.
Now I assume the curve is a simple closed curve which is homeomorphic to
a circle. By Jordan curve theorem, |
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l****z
发帖数: 29846 | 34 On January 21 when the Canadian Central Bank unexpected slashed interest
rates, I wrote Canadian Recession Coming Up.
Following the rate cut, the yield curve in Canada inverted out to three
years. Inversion means near-term interest rates are higher than long-term
rates.
I saw no other person mention the inversion at the time. An inverted yield
curve generally portends recession.
Nine days later, the Canadian yield curve is still inverted. Let's compare
what I posted about the curve on January 21... 阅读全帖 |
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j**j
发帖数: 4 | 35 这个题目可以从高位到低位，逐个确定位的value，每个位只能是3或者5，如果是小于
33333。。。，那么就输出33333.。。。如果小于35555.。。， 那么确定最高位位是3
，否则这个位就是5。然后记录下来，再推下一个。
public static int largerInteger(int num) {
int digits = 1;
int d = 1;
int upper = 5; // for value boundaries.
int lower = 3;
while (num / d >= 10) {
digits++;
d *= 10;
upper = upper * 10 + 5;
lower = lower * 10 + 3;
}
if (num >= upper) return lower + 3 * d * 10;
if (num < lower) return lower;
int curV = 0;
fo... 阅读全帖 |
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a*********a
发帖数: 3656 | 36 dude, I don't think you understand that figure. it has nothing to do with
correctness of exposure. any exposure will have highlighs and shadows, unless it is an exposure of just a grey card. each of those curve spans the whole dynamic range of the image.
the horizontal is the brightness, the vertical is S/N. what it says is that
even at high ISO, highlights are still shot noise limited. but shadows are
read noise limited. while at low ISO, almost the entire dynamic range of the
image is shot noi... 阅读全帖 |
|
t**********m
发帖数: 205 | 37 The Structuring Force of Galaxies （3rd Version)
http://rxiv.org/pdf/1103.0110v3.pdf
The concept of rational structure was suggested in 2000. A flat material
distribution is called the rational structure if there exists a special net
of orthogonal curves on the plane, and the ratio of mass density at one side
of a curve (from the net) to the one at the other side is constant along
the curve. Such curve is called a proportion curve. Such net of curves is
called an orthogonal net of proportion curv... 阅读全帖 |
|
t**********m
发帖数: 205 | 38 The Structuring Force of Galaxies （3rd Version)
http://rxiv.org/pdf/1103.0110v3.pdf
The concept of rational structure was suggested in 2000. A flat material
distribution is called the rational structure if there exists a special net
of orthogonal curves on the plane, and the ratio of mass density at one side
of a curve (from the net) to the one at the other side is constant along
the curve. Such curve is called a proportion curve. Such net of curves is
called an orthogonal net of proportion curv... 阅读全帖 |
|
t**********m
发帖数: 205 | 39 The Structuring Force of Galaxies （3rd Version)
http://rxiv.org/pdf/1103.0110v3.pdf
The concept of rational structure was suggested in 2000. A flat material
distribution is called the rational structure if there exists a special net
of orthogonal curves on the plane, and the ratio of mass density at one side
of a curve (from the net) to the one at the other side is constant along
the curve. Such curve is called a proportion curve. Such net of curves is
called an orthogonal net of proportion curv... 阅读全帖 |
|
l***y
发帖数: 1166 | 40 Dynamic theory of gravity
引力的动态理论
Tesla published a prepared statement on his 81st birthday (July 10, 1937)
critiquing Albert Einstein's theory of relativity. The following is a
portion of that statement:
特斯拉在他81岁生日的时候（1937年6月10日）准备了一份发表声明，批评爱因斯坦的
相对论。以下是发表声明的一部分：
"... Supposing that the bodies act upon the surrounding space causing
curving of the same, it appears to my simple mind that the curved spaces
must react on the bodies, and producing the opposite effects, straightening
out the curves. ... 阅读全帖 |
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z*******3
发帖数: 13709 | 41 【 以下文字转载自 USANews 讨论区 】
发信人: lczlcz (lcz), 信区: USANews
标 题: 加拿大银行承认衰退开始了
发信站: BBS 未名空间站 (Sun Jul 19 16:28:19 2015, 美东)
Bank of Canada Admits Recession: Shades of Voldemort; The Solution: More
Bubbles; Operation Twist Canadian Style?
The Bank of Canada admitted on Wednesday that Canada was in Recession. Well
sort of.
Bank of Canada Governor Stephen Poloz is afraid to speak the "R-Word".
Instead, Poloz phrased it this way: "Real GDP is now projected to have
contracted modestly in the first half o... 阅读全帖 |
|
y****8
发帖数: 215 | 42 Faulty article. Flattening the curve is not a deadly delusion. Your title is
misleading. Curve flattening is inevitable and will happen, the question is
where and when will the curve flatten? Will it happen when it infects the 7
.7 billion people that exist on earth and there’s no one else to infect
further or hopefully much earlier than that. In reality linear exponential
regression curves never apply in the real world setting. Logistic
regressions are more applicable.
Flattening the curve is t... 阅读全帖 |
|
l****z
发帖数: 29846 | 43 Bank of Canada Admits Recession: Shades of Voldemort; The Solution: More
Bubbles; Operation Twist Canadian Style?
The Bank of Canada admitted on Wednesday that Canada was in Recession. Well
sort of.
Bank of Canada Governor Stephen Poloz is afraid to speak the "R-Word".
Instead, Poloz phrased it this way: "Real GDP is now projected to have
contracted modestly in the first half of the year."
Shades of Voldemort
Poloz further went out of his way to state the "R-word is unhelpful".
Pressed by re... 阅读全帖 |
|
a***n
发帖数: 1616 | 44 torque curve 描述的就是一条饱和曲线 (额定负载)。
在torque curve以下的未饱和点，以及在torque curve以上的过饱和点，
效率皆从torque curve线点的峰值效率往下递减(严格讲，也可能不是纯单调递减)
自己draw一条铅垂线思考吧。
x轴上的点效率没有定义 0/0。
(torque = 0, work = 0 [sb would say -]. for manual FI car above RPM0, fuel = 0)
//也许你很难达到torque curve以上的过饱和点，hoho
//actually, there might be multi torque curves, in which case, you may imagine
//multiple (may not be equal) peak efficiencies along the vertical cut line! |
|
t******l
发帖数: 10908 | 45 另一方面，我觉得 “美式构建式数学教育”，在 代数/前代数/Formal-Operation 阶
段最大的问题，两个：
其一：是在 Formal Operation 阶段，没有考虑 Formal Operation 阶段的特点，照抄
小学阶段 Concrete Operation 的 spiral 教学法。这带来 (a) 教学进度太慢，教授
的基础知识太少，花太多时间在不必要的 spiral 上，(b) 在 Formal Operation 的
spiral 的循序渐进层面，也有问题。
这个原因是 Formal Operation 是有明显的阶段性和结构性的，而 spiral 的时候很难
越过阶段性和结构性的边界。举个例子就是：
Algebra 1 和 "linear" geometry / "linear" analytic geometry，比如 solve
linear equation, solve system equations, complete a square, solve quadratic
equation, equation of line, slope of ... 阅读全帖 |
|
m*****m
发帖数: 242 | 46 这几台都贴出来问问吧
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4K UHD HU... 阅读全帖 |
|
b*********s
发帖数: 5382 | 47 ☆─────────────────────────────────────☆
playadelrey (A smile is a curve gets things straight) 于 (Tue May 17 14:46:58 2011, 美东) 提到:
http://www.youtube.com/watch?v=pMJHT3t4Pc4
☆─────────────────────────────────────☆
belone (黑老大) 于 (Tue May 17 14:56:05 2011, 美东) 提到:
不得不说，汤唯的语言能力确实不是其他女星拼的过的，虽然看起来还是稍微有点紧张
☆─────────────────────────────────────☆
playadelrey (A smile is a curve gets things straight) 于 (Tue May 17 15:04:02 2011, 美东) 提到:
agree...
☆─────────────────────────────────────☆
... 阅读全帖 |
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d**i
发帖数: 9682 | 48 【 以下文字转载自 Shanghai 讨论区 】
发信人: drei (drei), 信区: Shanghai
标 题: [合集] 汤唯戛纳英語訪談 (转载)
发信站: BBS 未名空间站 (Wed May 18 00:44:57 2011, 美东)
发信人: bubububbles (paopaopaopao), 信区: Fashion
标 题: [合集] 汤唯戛纳英語訪談
发信站: BBS 未名空间站 (Tue May 17 22:26:29 2011, 美东)
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playadelrey (A smile is a curve gets things straight) 于 (Tue May 17 14:46:58 2011, 美东) 提到:
http://www.youtube.com/watch?v=pMJHT3t4Pc4
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belone (黑老大) 于 (Tue May 17 14:56:05 201... 阅读全帖 |
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k**o
发帖数: 3006 | 49 ☆─────────────────────────────────────☆
majiaIIV (马甲丙) 于 (Sun Mar 31 12:37:34 2013, 美东) 提到:
首先声明我可不是专业的，大家问的多就来抛块砖头，鼓励专家多来切磋。
我这里主要针对有一定基础的新手，注重简单明快的调节手法，没有商业专家的精细手
段，避免过多的摄影和光学术语。
第一个问题为什么要调色？
很多人不喜欢后期，有的认为器材里出来才是原汁原味，后期是加味精。其实数码时代
机器本身就是一台自动PS机，直出的片子是机器电脑根据一些大众化的公式计算出来的
，用户只可以选择一下是vivid还是natural等几个flavor，哪有什么原味，机器和后期
就像自动挡和手动挡的区别。机器里内置的PS能满足大部分的到此一游照，也有很多满
足不了的时候，更重要的是机器自己调节的片子一般比较中性，往往掩盖了片子本身巨
大的潜力。因此我用数码机，从来都是用RAW模式，自己来发掘片子的潜力。不喜欢后
期的人真没必要上DSLR，因为DSLR注重的是RAW的潜力，机内配的JPEG engine还不如很
多小DC。... 阅读全帖 |
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p**o
发帖数: 3409 | 50 Reality Check:
1.) Most MTF curves are merely plotted from calculations, meaning they are
only true in the manufacturer's wildest dreams. No real lens from the
assembly line would ever be able to equal this, since tolerances are never
perfect. Real MTF curves are measured from real samples of lens.
2.) MTF curves look best when plotted for only one color, and worse if
plotted for several colors integrated at once. They look worst for white
light, which is how we actually use them photographicall... 阅读全帖 |
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