s*****y 发帖数: 897 | 1 再弱问一个问题,
careercup 150上面代码如下:22 public double slope;
23 public double intercept;
24 private boolean infinite_slope = false;
25 public Line(GraphPoint p, GraphPoint q) {
26 if (Math.abs(p.x - q.x) > epsilon) { // if x’s are different
27 slope = (p.y - q.y) / (p.x - q.x); // compute slope
28 intercept = p.y - slope * p.x; // y intercept from y=mx+b
29 } else {
30 infinite_slope = true;
31 intercept = p.x; // x-intercept, since slope is infinite
32 }
33 }
34
35 public boolean isEqual(double a, doub... 阅读全帖 |
|
t******l 发帖数: 10908 | 2 看样子还是我比较狠一点。。。当然我娃也比较大一点。。。我这么
给娃 spiral 概念的:
========================================================
第一攻击波:
先说朴素集合论
然后说 slope (rise over run) 的概念
然后说 point-slope 的概念
然后用 “朴素集合论 + point-slope + linear equation” 推导
point-slope 方程。。。当然从 y = x 开始。。。
然后推导 point-point / point-intercept 方程
然后特么没教会,撤。。。
========================================================
第二攻击波:
先教欧几里德平面几何概念,第四公理,第五公理,平行线定义,
相似三角形。。。
然后朴素集合论 <=> 实数集,实数 pair 集 (R1 R2)
然后平几二维空间 和 解几二维空间 的对应关系(第四/第五公理,矩形)。
然后朴素集合论的点集合形成直线 <=> 实数 pair... 阅读全帖 |
|
f**d 发帖数: 768 | 3 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 |
|
s********u 发帖数: 1109 | 4 做了一下7.6,就是找经过点最多的直线。
答案给的比较复杂,是用一个 >的hashmap,在斜率匹配的情况
下,再去vector找匹配的line,而且感觉有bug,在匹配斜率的时候没有考虑斜率无穷
大的情况。
我想了一下C++的做法,比较直观的做法是建立 的hashtable,然后重载一下
预算符,当斜率差和截距差都小于eps = 0.0001的时候视作两条线是同一条线。
但是因为重载这一块不太熟,不知道写的对不对,请大牛们指点一下:
//Given a two-dimensional graph with points on it,find a line which passes
the most number of points.
class Line{
private:
double slope;
double intercept;
bool infinity_slope;
static double eps;
public:
... 阅读全帖 |
|
j*s 发帖数: 46 | 5 Quoting from Blue Ridge Outdoors Magazine.
Fill in the Blank: The steepest terrain in the southeast is found at _______
__ and _________.
A: Sugar Mountain Resort and Snowshoe Mountain Resort
North Carolina’s Sugar Mountain tops out at 5,300 feet and has a total
vertical drop of 1,200 vertical feet, one of the longest cumulative drops of
any resort in the Southeast. But vertical drop alone doesn’t belie a slope
’s steepness. For that, you have to look at the slope’s actual grade or
pitch. That’s... 阅读全帖 |
|
s***c 发帖数: 1664 | 6 前阵面试碰到过这个题,我觉得是fit a linear mixed model, diet是fixed effect
, weeks是random effect (random slope and intercept)
就是每一只老鼠,都fit a linear model, random slope and intercept是normal
distributed
我可能想复杂了,weeks可以算作fixed effect。。其实一直没搞明白GEE怎么回事
library(nlme)
fit<-lme(weight~diet*weeks,data=data, random=1+weeks|id, method="ML")
Model Specification:
𝑌𝑖𝑗 = 𝛽0 + 𝛽1 ∗ diet + beta2 &
#8727; weeks + 𝛽3 ∗diet ∗ weeks +bi,0 + 𝑏
119894;,1ͨ... 阅读全帖 |
|
A**********t 发帖数: 19 | 7 房子从前往后是一个slope,还有点陡。deck和padio都在侧边(后院不大,也不能往后
做)
单门是basement的出口,上面有一楼deck的出口。由于slope,basement的出口离后院
的地平面都有一人高。
原来一开始计划的是一楼出来做常规的deck。下面basement的出口处做一个同deck一样
大小(12*10)的concrete padio。当然需要沿着房子后墙做一个retaining wall,做
到跟basement地面一样高,先填土,然后倒水泥。
现在这个manager跟我说,建议我不做concrete padio,而是再做一个跟一楼一样的
deck,这样就是两层deck。这么建议的原因是(如图),因为房子前后的slope,如果
下雨的话,前面的雨水会顺着slope留到concrete padio上。但如果做不填土做实心的
padio而做架起来的deck,deck下就保持原来的slope,从而雨水能正常留到后面去。
按照表明的价格上看做deck的成本比padio要贵一倍左右。不知道这是在忽悠我加钱呢
还是这问题比较严重。
我现在的想法是如果做concrete... 阅读全帖 |
|
t******l 发帖数: 10908 | 8 y = x^2 ,这个得教。也就是 perceptual-conceptual priming。
(对称性/单边之类的 Concrete Operation 分析也略去了)。
在概略画图后,曲线上取两点 (x1, y1) 和 (x2, y2),画一直角三角形,求 slope (
rise-over-run)。(perceptual-priming)。得 slope
m = (y2 - y1) / (x2 - x1)
substitution (semantic priming) 后,
m = (x2^2 - x1^2) / (x2 - x1)
但是我们要 infinitesimal close,所以问题是能不能避免分母是零,或者干脆
cancel 掉分母。这样就 difference of two squares (play with algebraic squares
的一种),得:
m = ((x2 + x1) * (x2 - x1)) / (x2 - x1)
现在是因为 infinitesimal close, 所以没有被零除的问题。
m = x2 + x1
还是因为 infin... 阅读全帖 |
|
t*******t 发帖数: 1656 | 9 你打的场子难度(slope rating)区别大不大?
我的感觉,如果经常打难度120左右的场子,我大概可以拿到15左右的 handicap
,也就是+16左右的成绩。 但是一去slope>140的场子,我就破不了百,handicap
马上降到22-25。
弯曲这里,muni 场地大概就是slope 120左右.slope>140的场子,有著名的 the
ranch, blue tee slope rating 147. 我每次感觉有长进的时候就去受虐一把,迄今为
止最好103 杆,换算成 handicap 24. |
|
f*****e 发帖数: 57 | 10 On Friday I had a serious accident, but came out without a scratch. My only
lost is an ice axe and a pair of sunglasses.
It was a Mountaineer's scramble trip. Our original destination was West
Granite, but changed to Pratt Mountain because of cornices. Pratt Mountain
is supposed to have a "safe" route to the summit following the ridge. It is
on the ridge that I slipped off for about 300 vertical feet.
Going up to the summit was uneventful, as we all know, most accidents
happened on the way d... 阅读全帖 |
|
q*c 发帖数: 17993 | 11 http://www.forbes.com/sites/christophersteiner/2014/11/18/the-t
The Top 10 Ski Resorts In North America For 2015
1. Jackson Hole Mountain Resort, Wyoming — PAF: 99.0
We have crowned Jackson Hole as the preeminent place to ski not only in the
United States, but also within the whole of North America. More skiers are
finding out that Jackson is the right place for more than just the hucker/
powder set. Jackson established a record for its skier visits last year with
563,631, a 12% increase compare... 阅读全帖 |
|
发帖数: 1 | 12 Yangtze River
RIVER, CHINA
WRITTEN BY: Aleksandr Pavlovich Muranov Charles E. Greer
See Article History
Alternative Titles: Ch’ang Chiang, Chang Jiang, Da Jiang
Yangtze River, Chinese (Pinyin) Chang Jiang or (Wade-Giles romanization) Ch
’ang Chiang, longest river in both China and Asia and third longest river
in the world, with a length of 3,915 miles (6,300 kilometres). Its basin,
extending for some 2,000 miles (3,200 km) from west to east and for more
than 600 miles (1,000 km) from north to so... 阅读全帖 |
|
发帖数: 1 | 13 Yangtze River
RIVER, CHINA
WRITTEN BY: Aleksandr Pavlovich Muranov Charles E. Greer
See Article History
Alternative Titles: Ch’ang Chiang, Chang Jiang, Da Jiang
Yangtze River, Chinese (Pinyin) Chang Jiang or (Wade-Giles romanization) Ch
’ang Chiang, longest river in both China and Asia and third longest river
in the world, with a length of 3,915 miles (6,300 kilometres). Its basin,
extending for some 2,000 miles (3,200 km) from west to east and for more
than 600 miles (1,000 km) from north to so... 阅读全帖 |
|
l****z 发帖数: 29846 | 14 SLIPPERY SLOPE: Politico Writer Calls for Legalization of Polygamy
Michael Cantrell
June 26, 2015 4:33 pm
When a conservative is debating a fruitcake liberal about why homosexual
marriage shouldn’t be legal and uses the “slippery slope” theory, he or
she is immediately ridiculed, laughed at, made fun of, and called every
kooky name in the book.
Mr. Liberal will tell you there’s no such thing, that no one intends to
legalize any other kind of nuttiness, you’re just a bigot!
Well, just a few hours... 阅读全帖 |
|
k*j 发帖数: 153 | 15 careercup那本书上一道题。
10.3 Given two lines on a Cartesian plane, determine whether the two lines
would intersect.
书里是用slope来做。
return abs(line1.slope-line2.slope)>esp || abs(line1.yintercept - line2.
yintercept) < esp
但明显这没有考虑slope infinite的情况。所以不是很好的solution.
想问问这题有没有更general的解法呢?多谢! |
|
G******i 发帖数: 5226 | 16 ☆─────────────────────────────────────☆
eeyy (angelling) 于 (Sun Oct 30 21:30:51 2011, 美东) 提到:
湾区medical device公司 Base 110K+Bonus (~10K, depends on performance)+
Options。发现BME(Biomedical Engineering)专业工资真是不能和CS的比,看着版上G
M A F L大offer眼红。。。。女怕嫁错郎,男怕入错行,上天曾经给过我转CS的机会,
而我没有好好珍惜。。。。
说说这个公司的面试经验吧,电面两轮,HM+一个Scientist,问技术问题
Onsite presentation + 7个人interview,其中4个Scientists/Engineers,一个HM,
一个CTO,一个HR
Presentation是一个展示能力的机会。并不是要用来显示自己的work有多牛,而是显示自
己多么适合这个职位,直接拿自己的thesis去肯定不行的,要针对Opening job
requiremen... 阅读全帖 |
|
s********u 发帖数: 1109 | 17 如果是C++的话,用map,只需要重载<或者给一个comp就行了,这样省去写hashcode。就
算是这样,因为double不能判断相等的问题,写起来也相当麻烦。
比如像这样:
bool operator<(const Line& l)const{
if( infinity_slope&& l.infinity_slope )
return intercept - l.intercept < eps;
if( infinity_slope)
return true;
if( l.infinity_slope)
return false;
if( (slope - l.slope) > eps )
return true;
if( (slope... 阅读全帖 |
|
w*******s 发帖数: 96 | 18 牛人,居然用double的方法做出来了。能解释一下比较函数和思路吗?先找平行线?然
后看点是不是在那个上面?
struct Comp{
static double eps;
bool operator()( const Line &l1, const Line &l2){
if( l1.slope - l2.slope < -eps )
return true;
if( l1.slope - l2.slope > eps)
return false;
return (l1.intercept - l2.intercept < -eps);
}
}; |
|
c***t 发帖数: 1021 | 19 12月份又作了一次inspection 这次屋内地面海拔高度差别达到了2.1 inches。7个月内
增加了0.7 inches,是不是有点快啊?
inspector说不用修,只要正确浇水
——————————————————————————————————————
dallas,1997年的2-story house
2012年5月做的foundation evaluation,简单说就是有一些minimal distress,屋内地
面海拔高度在55 feet距离内有1.4 inches的差别。
Exterior distress was observed as follows:
1. Minimal exterior distress, caulk separation on front right second floor
window.
Interior distress was observed as follows:
1. Tile cracks in the entry hall.
2. Up right bath door rubs frame.
Elevation ... 阅读全帖 |
|
t******l 发帖数: 10908 | 20 不过话说回来,很多小学老师也不一定真正理解了 angle vs slope 的概念,就是一笔
糊涂账。
其实说白了就这么简单:
What is angle? Imagine you slice the pizza, whenever you slice the circle (
from the center), and you look at the rotational symmetry, you have the
angle.
What is slope? Imagine you climb stairs, whenever you see a right angle
triangle (could be infinitesimal), and you look at translational symmetry,
you have your "rise" versus your "run", so you have the slope.
And what connect them? Trigonometry.
当然上网看看还是有好处的,至少对娃会比较耐心点。
:其实从初中 A... 阅读全帖 |
|
t******l 发帖数: 10908 | 21 因为 parabola 可能把许多心理系的测试者自己给先放翻(比如像初中生一个给个 U
shape 啥的 elevator pitch, not precis at all),所以我先给答案:
a. They are all continuous curves.
1. "straight" line maintains a constant slope (rise-over-run) at any point.
2. circle maintains a constant distance (radius) to a given fixed point (
center).
3. parabola : Rate of change of the slope is constant (from left to right).
The slope at the vertex point is zero. (BTW: Slope means rise-over-run
between two "infinitesimal adjacent" points) .
given |
|
t******l 发帖数: 10908 | 22 欧几里德确实伟大,但有争议的说,这哥们更多的是个哲学家而不是实干家。
拿最基本的直线的例子说,这哥们的 “两点一直线” 的最大问题,就是不能 beyond
arms reach,两个点都在沙滩上。所以最后也没挡住罗马海军。
而牛顿这哥们,更多的是个实干家。
而实干家则认为,在解析几何里,直线的 point-slope (rise-over-run) 概念是基石。
这是因为奥运女子七项全能选手 Jessica Ennis-Hill 说,只有 point-slope 的概念
,才能让标枪 (javelin) 可以 beyond arm's reach。(滚动字幕:欧几里德老哥的“
两点一直线”早犯规出局啦啦啦,这哥们以为是一百米比赛,直接跑到标枪落点!!)。
而 Piaget 老先生说,这就是人类进化史上 object-permanence 这种大杀器的威力。
老虎狮子既跑不过标枪,又扛不住标枪,只有跪舔一条路!
但是英王詹姆士II说,Jessica Ennis-Hill 这小蛮妞,就比蛮力扔的远,准头不行。
但我们皇家海军揍西班牙无敌舰队,舰炮光远不行,更重要的是准。但这标枪地面投影
是... 阅读全帖 |
|
t******l 发帖数: 10908 | 23 或者更进一步好了。下面的这个智商测试如果做慢或者做的磕磕碰碰,对解 “球面上
每一圈上升一米,求路径总长度” 的题目,有没有哪怕特么一点点影响。
或者这个寓言的 moral story 就是:
(1)再复杂的 2-D 能力,不一定跟最最简单的 3-D 和 high-dimension 的能力,有
那么一点点相关性。
(2)再复杂的 point-point 的 perception,不一定对最最简单的 point-slope 的
perception(一阶导数)的能力,有那么一点点相关性。
诚然,每个娃的 perception 的成长过程都是从 2-D / 3-D 到 high-dimension,从
point-point 到 point-slope 到 slope-on-slope。但是:
(1)这不是说一定要成为 2-D 三八红旗手阿姨,实际上 2-D 三八红旗手阿姨最后多
半 end-up 在猴子,8 billion 猴子。
(2)大脑在掌握 high-order thinking skill 以后,为了防止自己成为金三胖的体型
而 neuro-atypical,不一定保留 lo... 阅读全帖 |
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t******l 发帖数: 10908 | 24 回到数学问题上,比如解析几何直线的 point-slope 概念(其中 slope 是 rise-over
-run),其实就是 chunking。
而区别于 “死记硬背直线方程型 chunking” 的区别,就是 domain-specific vs
domain-
general。争议的说,point-slope 的 chunking,可以一直延伸到 微积分/运动学/甚
至曲面几何等等的 perceptual processing。
而死记硬背直线方程的 chunking,you know,高考考完就可以 decay 了。// run
类似的,complete a square vs 二次方程求根公式。
当然,domain-specific chunking 也有其优点,最大的优点就是迅速准确。
其实我自己高考绝对不会去 complete a square 或者 point-slope,直接考前把公式
给背个滚瓜烂熟,然后高考备考一年把题目给刷成滚瓜烂熟用脊髓就可以刷刷刷做完。
否则我就是大沙比。
但高考一旦考完,我立马跑到数学老师那里,把那些公式统统还给高中数学老师。而高
中数学... 阅读全帖 |
|
E*******e 发帖数: 1371 | 25 也不一定,现在气温还是比较高的
有人昨天目测说山的南坡已经看不到雪了
by jdorje » Wed Sep 21, 2011 8:32 am
Following more snow Thursday-Saturday, most ascents failed on Saturday and
Sunday. By Monday Challenger was climbable. From Sunday on every day has
been sunny and warm (55ish at 14k).
As of yesterday:
* North of Mount Adams, no snow at all is visible on the Sangre 13ers.
* From Adams down to Crestone Needle, there is some snow still on north
slopes. South slopes do not appear to have any visible snow from the valley.
H... 阅读全帖 |
|
n****r 发帖数: 1568 | 26 偶现在就居住在prospect park west 旁某栋3层的limestone house。这个社区就是著
名的park slope (公园坡)。基本上算是布鲁克林最好的社区之一。park slope 的规
划和建筑设计同样出自于central park 的设计师之手。本社区90%居民是中上产白人。
有很多好莱坞电视电影明星也居住在这里。另外女同也特别多哦。亚裔这2年也多起来
。估计是奔着优秀的学区而来。另外本社区女多男少,有志外藩的女性会遇到很强的竞
争。建议华男来此攻城略地。
P.S.
park slope (公园坡)纵向在9th street 到 sterling place之间。横向是4th ave 到
prospect park west之间。9th street 之后虽然也叫park slope建议不要去了。这个
9th street 相当于曼哈顿的96街,不过9th street 向下都是些white trash 和
hippies 居住。地铁可坐BDNQ2345在atlantic ave 转乘 bay ridge 方向的 R 车,坐
一站在union street ... 阅读全帖 |
|
u*****a 发帖数: 6276 | 27 你如果以亚裔人口占 5%;加上 AA;就得出 弯曲 IT 公司以后亚裔只有 5% 的结论的
话,就是:
没明白怎么回事儿?好说,下面举两个例子:
The anecdotal track record of people making slippery-slope predictions in
the political domain is replete with bad forecasts. An opponent of women’s
suffrage once predicted that giving women the right to vote would create a
“race of masculine women and effeminate men and the mating of these would
result in the procreation of a race of degenerates.” Another opponent,
noting that women represent more than half the population... 阅读全帖 |
|
G***G 发帖数: 16778 | 28 maybe. I don't know yet.
when I was young, old people in my hometown taught me to distinguish
them by their direction.
A snake's hole is with a slope angle going up.
.
.
---------water surface
but a Chinese eel's hole is with a slope angle going down.
---------water surface
.
.
But someday when I went fishing Chinese eel with my father, my father caught
a big snake from a hole with a slope angle going down.
so it is quite difficult to tell the difference.... 阅读全帖 |
|
ET 发帖数: 10701 | 29 i didn't read his article. i don't like reading people writing articles in
that style..
but definitely 150 slope is crazy. it's like US Open golf course slope. It'
s quite often to see 120-135 slope in Texas, but barely see 150, except the
one I played the Texas mid-am course - UT golf club.
i saw some golf coures in florida getting high slope. i don't think it's
that difficult tho. mainly i guess there are too many water ponds. |
|
v*****r 发帖数: 2325 | 30 los lagos or spring valley slope around 110, while summit pointe slope 130 (
gusty wind makes matter worse).
davis municipal slope 97. no wonder i shot a lower score with probably
inferior game at Davis... now got some feeling about what slope means.
heard oobgolf.com from birdie 2005, good website to bookkeep our play. not
only calculate score, but also you can write notes there.
it also show the same day score by other golfers, one guy with 10+ handicap,
shoot from forward red tee, score over |
|
|
|
y**********7 发帖数: 769 | 33 Slope 113是球场的标准(平均)难度. 用它计算应该是准确的.
The formula for converting a Handicap Index to a Course Handicap is:
Course Handicap = (Handicap Index x Slope Rating) divide by 113
So, for example, a golfer with a Handicap Index of 11.2 will have a Course
Handicap of 12 on a course with a Slope Rating of 124. The calculation is (
11.2 x 124) / 113 = 12.3 so the course handicap definition becomes 12 when
the decimal is rounded down.
The standard slope rating value is 113, which represents a course of average |
|
b********l 发帖数: 84 | 34 你那里地形比较平?
bay area 有几个在荒山沟谷中建的球场, slope 都较高。
我倒是倾向打一般的muni, 但是这个高slope 球场离我太近了,用它的练习设施最多。
最近它终于开始提供happy hour.
你在slope 120多的muni 打 80s, 这种高slope球场适应一下, 也应该80s.
主要是forced carry 多一些, uneven lie 多, 有些fw就是不容易drive, 一出fw
first cut 10吗, 就是native area, 丢球或很难找球了。如果你在一般muni不丢球,
这这估计要丢2-4 个球吧。
我还不是很明确这个场地的OB, 说是有黑顶的白桩,没怎么看到。 不知道native area
算OB 还是lat hazard. 如果OB的话, 得分影响更大。 |
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b********l 发帖数: 84 | 35 你那里地形比较平?
bay area 有几个在荒山沟谷中建的球场, slope 都较高。
我倒是倾向打一般的muni, 但是这个高slope 球场离我太近了,用它的练习设施最多。
最近它终于开始提供happy hour.
你在slope 120多的muni 打 80s, 这种高slope球场适应一下, 也应该80s.
主要是forced carry 多一些, uneven lie 多, 有些fw就是不容易drive, 一出fw
first cut 10吗, 就是native area, 丢球或很难找球了。如果你在一般muni不丢球,
这这估计要丢2-4 个球吧。
我还不是很明确这个场地的OB, 说是有黑顶的白桩,没怎么看到。 不知道native area
算OB 还是lat hazard. 如果OB的话, 得分影响更大。 |
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o*****e 发帖数: 379 | 36 Chutla Peak在Raininer的南边,是Tatoosh range西端的一个山峰。星期六天难得的好
,雪崩风险预报4000ft以下是moderate,往上南面就是considerable了;Chutla最顶上
有一段还比较陡的向南的open slope,不过Tord觉得问题不大。其他人都没有带beacon
,我也只好把我的留在车里了。说好7点在longmire集合,纠结了两天,还是没勇气冰
天雪地的睡trailhead,星期六早上4点半爬起来carpool去的,几乎睡了一路,真困啊
。第一次碰到有人迟到了将近20分钟,Tord很好脾气的等;那个家伙get ready也特别
的慢,用了差不多半个小时,最后快8点才出发的,真是白起那么早了。从桥上过了
Tahoma creek之后,就是trailhead。大部分溪水都冻住了,上面盖着层薄薄的雪。太
阳正打在Rainier的山顶上,照的偌大的山体一道暗一道亮的。
沿着树林里的trail一路zig-zag的往上走,出发没多久就要穿snowshoe了;trail显然
是很久没有人走过的了,路上不时能碰到些横倒、未及清理的树木,路上的雪也... 阅读全帖 |
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q*c 发帖数: 17993 | 37 ☆─────────────────────────────────────☆
qmc (qmc) 于 (Thu May 20 01:26:09 2010, 美东) 提到:
http://www.willisskiandboard.com/Wil/pages/Rocker%20Skis%20and%
Every few years an evolutionary shift happens in the world of snow sports.
When snowboarding was first born it changed the industry forever. Shaped
skis had a similar impact and now Rocker Technology has impacted the slopes
by creating a whole new way to relate to the mountain.
To fully understand Rocker Technolgy and how it has effected sk... 阅读全帖 |
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H*****A 发帖数: 114 | 38 多谢回复。你说得太对了。自己滑的时候转弯技术完全难以实施。不过他的确是只带了
我一个上lift的,而且全程倒着滑带我一个人下来。现在想来是不是去的时候人少,赶
上了private lesson的待遇?
另外这个要搭lift上去的是不是就不可能是bunny slope了?我们是先在一个小雪包上
教学的。这个一点都不陡的小雪包可能是bunny slope吗?可能有两个bunny slope吗?
这么多年来我一直不敢再尝试滑雪就是一直认为bunny slope都好陡啊。 |
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l**********9 发帖数: 716 | 39 >45°? lol, hills are NOT as steep as you think they are.
25到30度就妥妥的黑道了。
There are two ways of measuring slope steepness. The first is a measurement
using degrees, which measures the angle of the slope in degrees from the
horizontal. The second is a percentage. This is calculated using the formula
100*rise/run. Rise is the vertical change and run is the horizontal
distance. A 100% slope is angled at 45 degrees.
10% is equivalent to 5.71o
20% is equivalent to 11.31o
30% is equivalent to 16.7o
40% ... 阅读全帖 |
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l**********9 发帖数: 716 | 40 >45°? lol, hills are NOT as steep as you think they are.
25到30度就妥妥的黑道了。
There are two ways of measuring slope steepness. The first is a measurement
using degrees, which measures the angle of the slope in degrees from the
horizontal. The second is a percentage. This is calculated using the formula
100*rise/run. Rise is the vertical change and run is the horizontal
distance. A 100% slope is angled at 45 degrees.
10% is equivalent to 5.71o
20% is equivalent to 11.31o
30% is equivalent to 16.7o
40% ... 阅读全帖 |
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t***n 发帖数: 1494 | 41 ☆─────────────────────────────────────☆
tweety2006 (抵制日货) 于 (Fri Jul 1 02:50:54 2011, 美东) 提到:
麻烦给个逻辑解释,很好奇,同性恋是如何看待这个问题的。
另外说同性恋是天生的,那么麻烦给篇权威的研究表明同性恋是天生的。如果这只是一
种可能的话,那么父女,母子之恋可否也是可能天生的,那么父女,母子也可以结婚的
。
☆─────────────────────────────────────☆
suifeng (godhelpme) 于 (Fri Jul 1 03:02:20 2011, 美东) 提到:
瑞士可以
☆─────────────────────────────────────☆
suifeng (godhelpme) 于 (Fri Jul 1 03:04:03 2011, 美东) 提到:
但是那个貌似属于另外一个话题了,和异性恋婚姻不是一个level的 而同性婚姻和异性
婚姻是属于并列关系
☆──────────────────────────────... 阅读全帖 |
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o******g 发帖数: 185 | 42 五月二日,康奈尔Slope Day。这一天是学期结束,暑期开始的标志。学生们扔掉书本
,冲到钟楼下面的大斜坡上,发泄掉一个学期的郁闷,回归正常的生活。
我本来没打算去。当时我正卧在Kennedy Hall前的草地上,读石强给我的文章。那篇文
章讨论的是一幅中世纪的人物画。在我看来,那幅画还不错,也不难理解,就是几个农
民在地里干活,但是文章我却看不大懂,它只字不提所画之物,而在谈一些别的东西。
我强忍着读完了,闭上眼睛,想象不出它和画有什么关系。我又翻出了那幅画,那幅画
还是那幅画。我又把文章重新读了一遍,读得非常仔细,频频动用词典。我读懂了每一
个词,但是当这些词连在一起的时候,摇身一变成了个巨大的迷宫,每一个词汇都可能
是个陷阱,或者迷宫的一个分叉,一步走错,就在迷途中越陷越远。在我和这些文字之
间,竖着一道看不见的高墙,即使我能翻越它,那个日子也一定遥遥无期。
一辆敞篷车飞驰而至,滋的一声停在我面前,花枝乱颤地放着一首歌,地上的渣儿跟着
节奏乱抖。上面坐着两个花枝乱颤的女孩子,一个金发一个褐发。金发向我大喊:
“What the hell you doing here,boy?!... 阅读全帖 |
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s**g 发帖数: 66 | 43 I guess the answer to Q1 shall be:
3 stage buffer approach leads to more jitter
Here is my reasoning:
single stage buffer jitter can be defined by
jtter_single = vn / slope
where vn is buffer input referred noise (assume the same in both cases),
slope is input signal rising/falling edge slope
since jitter from each stage is uncorrelated, we have
jitter_total = sqrt( N * (jitter_single)^2 )
where N is number of buffer stages
If we assume in both cases, buffer signal swing are the same Vswing and ... 阅读全帖 |
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b****e 发帖数: 227 | 44 转贴 纽约住房攻略(转自NYU BBS)
纽约有那些地方呢?五个区,Manhattan,就是平时所指的city,东北-西南走向。
Brooklyn, 也是历史悠久的地方,在Manhattan的东南方向。Queens,移民很多,在
Manhattan的东面,Brooklyn的上面。Bronx,黑人聚居区,Manhattan的北面。Staten
Island,小岛,Manhattan的南面。
住到Staten Island是不现实的,乘一次渡轮也要半个小时。大家有机会可以去玩玩,
至少可以乘乘免费渡轮。Bronx呢,还是算了,不适合我们。所以其实可以住的地方也
只有Manhattan, Brooklyn和Queens了。加上Manhattan西面的Jersey City(NJ)。
有这么一个有趣的现象:房租 x 到NYU的时间 = 25000。
我们一个个地方来看:
Manhattan,59街以南。其实就是中央公园以南到最南面。这块地方就是人人都想看一
下的地方。NYU在哪里呢,中间。假如你有幸从NJ方向或者 Queens方向看Manhattan的
话,你会发现北面都是高楼大厦,南面也都是... 阅读全帖 |
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h***y 发帖数: 834 | 45 ☆─────────────────────────────────────☆
blulue (小黑) 于 (Sat May 14 19:54:07 2011, 美东) 提到:
最近忙着搬家,估计搬好了也一时半会没网络,
先写个纽约租房子的简易版心得:
1.首先要想明白,租房的需要。单身汗还是家有父母小孩,空间大小,neightbourhood
需求是完全不同的。然后上班的远近?交通的方便安全?etc。
2.先在网上看好几个地方。也可以找broker(收费15% 1 year rental或者一个月房租
),事先与他交流,一来二去的邮件,他能更明白你想要的。broker是地头蛇,他带你
看一天,可以获得很多很多信息。及时最后没成交,也算是交个朋友。
3.向总住院当面询问租住房信息。人家很忙,邮件是不回的,趁去医院的时候,逮着机
会赶紧问。他几句话,可以省下很多功夫上网research。
4.纽约租房 background check相当严格,提前带齐所需材料(问broker需要什么材料
,或者联系你看中的apartment),可以当场提交application。几十块appl... 阅读全帖 |
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n*****1 发帖数: 172 | 46 y=a+b*x+b2*dummy的话, 你改变的是intercept, 就是说x是负数的时候, model变成y=(
a+b2)+b*x, slope还是b, 但
是intercept变成a+b2
y=a+b*x+b2*dummy*x的话, 你改变的是slope, 当x是负数的时候, model变成y=a+(b+b2
)*x, intercept还是a, 但是
slope变成b+b2
具体怎么设置, 你得看你究竟想test什么, 是slope变了, 还是intercept变了, 不过你
说"觉得当x为负数的时候suppose对y
的影响更大", 可能选y=a+b*x+b2*dummy*x比较好
如果coefficient是significant的话, 那么dummy就是确实有影响 |
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c*****n 发帖数: 14445 | 47 http://politicalticker.blogs.cnn.com/2012/10/24/cnn-shifts-nort
Frank
Let me ask everyone something. If Romney wins, would he be inheriting the
country better or worse then what Obama inherited in 2008?
Lets be sincere here, if Romney wins, He will be inheriting the country way
better than what Obama inherited in 2008.
Obama inherited the country losing 800,000 jobs a month in 2008.
If Romney wins, he would be inheriting the country making over 100,000 jobs
a month.
Obama inherited the country w... 阅读全帖 |
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c*****n 发帖数: 14445 | 48 http://politicalticker.blogs.cnn.com/2012/10/24/cnn-shifts-nort
Frank
Let me ask everyone something. If Romney wins, would he be inheriting the
country better or worse then what Obama inherited in 2008?
Lets be sincere here, if Romney wins, He will be inheriting the country way
better than what Obama inherited in 2008.
Obama inherited the country losing 800,000 jobs a month in 2008.
If Romney wins, he would be inheriting the country making over 100,000 jobs
a month.
Obama inherited the country w... 阅读全帖 |
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