g****u
发帖数: 695 | 1 All right, part 2, Technical Analysis.
I threw out a little hint at the end of part 1 by saying TA doesn't
work, and it got some defensive words back already. It will be
interesting to see what happens after I finish this part, because
if you accept what I am going to say, you probably will have to start
over in your trading adventure (which I think you should).
It is worth a few words to talk about what TA is trying to solve
first. Market price, no matter what the underlying product is, all
com... 阅读全帖 |
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N***S
发帖数: 189 | 2 正在学习option,有一个想法:
For straddle option, 能不能两个legs都用vertical spread?
For example
AAPL
Current price 560
Call vertical debit spread 560- 570 2 months
Put vertical debit spread 550-560 2 months
这样风险很小,make profit 的可能性还很大
★ 发自iPhone App: ChineseWeb - 中文网站浏览器 |
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E***r
发帖数: 1037 | 3 这次 UVXY IV-HV 的走法几乎完全复制 Brexit
虽然现在才说已经马后炮了，但不得不说又是一次难得的 short IV 的机会
这货 IV overstates HV 的程度，已经远远超过了 SPX
UVXY（和 VXX）是仅有的一个非常适合用 OTM call vertical 来 short 的产品
原因有三：
1. 干股难以借到，而且 short interest 高，还容易被 recall
2. positive Theta，一直挣时间价值
3. IV contraction works in your favor
第3点要解释一下：一般的股票，下跌时候 IV 是上升的，
你如果 short OTM call vertical，IV的升高会 dampen your directional gain
（这点如果不理解，以后再专门开贴讲）。
而 UVXY 和 VXX 恰好相反，股价下跌时 IV 下降，
你如果 short OTM call vertical，这里的 IV contraction 会放大你的收益。
OTM |
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E***r
发帖数: 1037 | 4 这次 UVXY IV-HV 的走法几乎完全复制 Brexit
虽然现在才说已经马后炮了，但不得不说又是一次难得的 short IV 的机会
这货 IV overstates HV 的程度，已经远远超过了 SPX
UVXY（和 VXX）是仅有的一个非常适合用 OTM call vertical 来 short 的产品
原因有三：
1. 干股难以借到，还容易被召回
2. positive Theta，一直挣时间价值
3. IV contraction works in your favor
第3点要解释一下：一般的股票，下跌时候 IV 是上升的，
你如果 short OTM call vertical，IV的升高会 dampen your directional gain
（这点如果不理解，以后再专门开贴讲）。
而 UVXY 和 VXX 恰好相反，股价下跌时 IV 下降，
你如果 short OTM call vertical，这里的 IV contraction 会放大你的收益。
OTM |
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E***r
发帖数: 1037 | 5 错开 strikes 就是 diagonal spread，其实就是 vertical 和 calendar 的简单叠加
，兼有两者特性。如果你是要 short (delta < 0)，需要 long strike > short
strike，不管用 put 还是用 call 做。
BTW，只要是互相 offset 的两腿组合，不管是 vertical、calendar、diagonal、
strangle 还是 straddle，沿options table 左右翻转以后（call 变 put、put 变
call）都是完全等效的，所有 greeks 都一样。比如 vertical -30C/+50C 跟 -30P/+
50P 等效，ITM strangle +30C/+50P 跟 OTM +30P/+50C 等效。既然等效，选谁呢？谁
OTM 选谁，毕竟 OTM 比 ITM liquid。put 和 call 是一样的。 |
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j********n
发帖数: 24 | 6 【 以下文字转载自 PhotoGear 讨论区 】
发信人: jianbujian (见不见), 信区: PhotoGear
标 题: [For Sale] 便携式摄影移动器
发信站: BBS 未名空间站 (Fri Jul 9 23:49:53 2010, 美东)
自从有了无敌兔，一直想用它拍电影。研究了很久，自己设计了一个便携式摄影移动器（HDolly Camera Slider Vertical），用起来感觉不错。:)
多做了一个放在三藩版的craiglist在卖。有兴趣的朋友请和我联系，也欢迎给我一些建议。谢谢了。
HDolly Camera Slider Vertical is a camera slider or glider offers film
makers a portable camera dolly system. Made in USA. It provides vertical,
horizontal and angle mounting options on a tripod, light stands, table top,
floor or grou |
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p*********e
发帖数: 201 | 9 這是從珠江鋼琴送出來的資料有關珠江鋼琴希望能對大家有幫助。
PEARL RIVER TALKING POINTS
• World’s largest piano factory
• Founded in 1956 – 56 years ago
• World’s most-selected piano – more pianos built per year than
any other manufacturer
• Sold in over 80 countries throughout the world
• Piano name same as factory
• Working partner with other prestigious piano companies
• Best value for the money spent
• 10 year warranty
Design
• Engineering st... 阅读全帖 |
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s*****i
发帖数: 5548 | 10 ☆─────────────────────────────────────☆
wm178 (wm178) 于 h 提到:
Houston有没有人要团购珠江钢琴？ 46寸，10人以上$3500， 包括税，十年保修和琴凳
。
☆─────────────────────────────────────☆
dw0453 (Di) 于 (Sat Jul 7 11:55:15 2012, 美东) 提到:
I am interested.
☆─────────────────────────────────────☆
pianomaggie (all about pianos) 于 (Sat Jul 7 11:57:38 2012, 美东) 提到:
48"不是46"
☆─────────────────────────────────────☆
pianomaggie (all about pianos) 于 (Sat Jul 7 12:10:22 2012, 美东) 提到:
這是從珠江鋼琴送出來的資料有關珠江鋼琴希望能對大家有幫助。
PEARL ... 阅读全帖 |
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G******y
发帖数: 1831 | 11 魔兽vertical应该不到40，不过也快了，37左右吧
身高7尺再vertical 40很可怕的了，Shannon Brown多少vertical,这家伙蹦起来真高 |
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p*********y
发帖数: 2288 | 12 不是，我所知道的veritcal jump都是垫子上原地上纵的
我们学校给的侧vertical jump的仪器，就是让你站在垫子上，不做任何助跑或者垫步
直接起
还给出了统计，美国常人的平均vertical jump高度大概26的样子，10%的常人能跳到34
以上。大婶忘了十多少了，好像是不到40，记得是37？
作为基因突变的老北京，vertical jump 43不稀奇，哈哈 |
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m*****g
发帖数: 12253 | 13 ☆─────────────────────────────────────☆
cowbee (牛蜜蜂简称牛疯) 于 (Thu Feb 23 21:07:37 2012, 美东) 提到:
比这还牲口？
☆─────────────────────────────────────☆
TaiYouCai (有才) 于 (Thu Feb 23 21:08:18 2012, 美东) 提到:
170-190之间
☆─────────────────────────────────────☆
Bernanke (Ben) 于 (Thu Feb 23 21:08:42 2012, 美东) 提到:
football player的身体素质要更好，不一定是那么高，美国都是天赋打不了football
的才去考虑其他运动包括basketball
☆─────────────────────────────────────☆
monksgs (monk) 于 (Thu Feb 23 21:09:56 2012, 美东) 提到:
天赋是哪些？跑锋还是四分卫？
前面人墙的... 阅读全帖 |
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t******y
发帖数: 5040 | 14 网上找来的：
VERTICAL JIGGING IS A VERY INEXPENSIVE WAY TO FISH BECAUSE IT DOESN’T
REQUIRE ANY EXPENSIVE EQUIPMENT. YOU CAN USE ANY TYPE OF ROD THAT YOU ARE
COMFORTABLE WITH, BUT I LIKE TO USE AN ULTRALITE ROD BETWEEN 8 AND 10 FEET
LONG. MY FRIEND BUDDY STILL USES 8 FOOT FLY RODS. AND YOU DON’T NEED A
COSTLY REEL BECAUSE YOU DO NOT CAST AND RETRIEVE AS YOU DO WHEN SPIN CASTING
.
ALL THE REEL IS USED FOR IN VERTICAL JIGGING IS TO HOLD YOUR EXCESS LINE.
THE REELS THAT I USE ARE PROBABLY THE CHEAPEST ONE... 阅读全帖 |
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g*********r
发帖数: 1443 | 15 vertical jigging的杆100刀以下基本不用考虑， 因为不存在。在kayak上垂直机耕可
行，但是在New England大概不太用的着。New England kayak可以够得着的而且可以
vertical jigging 鱼也就是striper和bluefish了. New England kayak能去的地方，
水不会太深。这样浅的水，vertical jigging虽然可以，但是不太用的着。一根7尺的
inshore杆，换几个深度yo-yo jigging就搞定了。
你如果想玩jigging的话，弄一根150g rating的杆在New England这边钓striper和blue
。我有一根spinal 150g，觉得还不错，你可以试试我的杆再决定。 |
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c******t
发帖数: 1733 | 16 On one end, strength determines how much force you can generate. For a lot
of people, getting stronger will make you faster and jump higher.
On the other end, there is plyometrics, which would be more related to how
quickly you can create force.
It is hard to beat Olympic lifts for improving the vertical.Olympic lifters
have excellent vertical leaping ability. It comes from jumping with the
weight every time you clean, snatch or jerk. I would also recommend pistol
and jumping boxes.
Sometime, it... 阅读全帖 |
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t*n
发帖数: 14458 | 17 Miami Hurricanes,小小摩丝跑得也挺快
Here are the highlights:
Marcus Maxey: 41.5-inch vertical jump with a clocking of 4.40-seconds in
the forty. Some had Maxey in the 4.3's.
Kelly Jennings: 12-reps on the bench and a 40-inch vertical. Performed very
well in position drills and had the Jacksonville Jaguars very interested
.
Sinorice Moss: 42-inch vertical and a 10'-3" broad jump. Ran routes and caught
punts but did not run the forty as the left quad he hurt at the combine
is still a problem. Moss clocked |
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t*n
发帖数: 14458 | 18 Miami Hurricanes,小小摩丝跑得也挺快
Here are the highlights:
Marcus Maxey: 41.5-inch vertical jump with a clocking of 4.40-seconds in
the forty. Some had Maxey in the 4.3's.
Kelly Jennings: 12-reps on the bench and a 40-inch vertical. Performed very
well in position drills and had the Jacksonville Jaguars very interested
.
Sinorice Moss: 42-inch vertical and a 10'-3" broad jump. Ran routes and caught
punts but did not run the forty as the left quad he hurt at the combine
is still a problem. Moss clocked |
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s*****r
发帖数: 477 | 19 身高臂长弹跳速度以及手的尺寸都是神仙级的
这么说吧，NFL的big size threat差不多是身高>6'2,vertical >39in，deep threat应
该是40yard <4.40s
根据combine，威震天身高6'5，vertical 42.5in, 40yard 4.35s
而联盟顶级的CB也就身高6'0，vertical 39in，40yard 4.4s |
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s*****h
发帖数: 44903 | 20 Vertical jump:
LSU’s Leonard Fournette had a vertical of 28 1/2”.
Dalvin Cook had a 30.5” vertical, and Christian McCaffrey had a 37.5” vert
.
For comparison, Adrian Peterson’s was 38.5”, and Derrick Henry’s was 37”.
==
状元秀Myles Garrett太牲口了，41 in |
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B**I
发帖数: 601 | 21 http://ezine.kungfumagazine.com/info/tournament/2010RULES_PushH
US Rules
RULES FOR TAI CHI PUSH HAND DIVISIONS
1. General Rules
a. Competitors must be over 18 years of age, have practiced Tai Chi Kung Fu
for more than 2 years, be able to show proof of coverage by a valid health
insurance policy (a valid insurance card is sufficient), and be willing to
sign the Liability Waiver. Competitors are required to follow the rules and
demonstrate courtesy to the judges and officials, the audience, and fe... 阅读全帖 |
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l*****y
发帖数: 4887 | 22 Key里面的是出手
Players occupying a legal marked lane space may not have either
foot beyond the vertical plane of the outside edge of any legal lane
boundary or beyond the vertical plane of any edge of space (2 x 36
inches) designated by a legal lane space mark or beyond the vertical
plane of any edge of the lane until the ball is released by the freethrower.
外面的是沾框
Players not in a legal marked lane space shall remain behind the freethrow
line extended and behind the three-point field-goal line until... 阅读全帖 |
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p********r
发帖数: 1432 | 23 It's a much simplified and preliminary version of Whirly Bird or Cartwheel
movements. Basically, in flat water, just move the boat vertical and hold, with or without paddle. Your upper body is kind of parallel to water surface. Eventually, you want make vertical rotation of the boat with control.
I can only make the boat vertical with paddle, but I can't hold and rotate. |
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p****l
发帖数: 1098 | 24 研究了半天，就five ten的能分出三个等级，
vertical milage，应该是初级，
vertical meter，应该中级，
vertical micro， 应该是高级。
其他的看起太累，都没分类，从价钱上看不出来，都有低的和贵的。 |
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g*2
发帖数: 658 | 25 Overview of running injuries of the lower extremity
Author
Lisa R Callahan, MD Section Editor
Karl B Fields, MD Deputy Editor
Jonathan Grayzel, MD, FAAEM
All topics are updated as new evidence becomes available and our peer review
process is complete.
Literature review current through: Feb 2012. | This topic last updated: Oct
20, 2011.
INTRODUCTION — Running is one of the world’s most popular forms of
exercise, with millions of regular participants. In the United States alone,
up to 40 mil... 阅读全帖 |
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t****n
发帖数: 3 | 26 It is a great article. However, looks like the calculation is wrong.
Considering the duration of each stride is "t", then H=g*t^2/4/2 = g*t^2/8.
In other words, it should be divided by 8 not by 4.
The reason is simple, it only takes t/2 (not t) to reach the maximum height
(when vertical speed becomes zero). Therefore, the initial vertical speed V
= g * t/2, and the average vertical speed from ground to H is V/2. then H =
V/2 * t/2 = g * t / 8.
Using this equation, the estimated energy consumptio... 阅读全帖 |
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l*******o
发帖数: 669 | 27
pressure
turn
on
frame
Thanks for your detailed comments. I have a few questions on your comments
though.
> 1. He is spraying snow directly down the hill.
Given the soft, slushy snow of the day, what would be the direction of the
spraying snow if skied properly?
> His edging is only for lateral push off in the middle or after fall line.
Is this wrong or is this correct but there is other use of edging which I
did not execute?
> 6. His flexsion and extension is done vertically, causing his back... 阅读全帖 |
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i*********5
发帖数: 19210 | 28 【 以下文字转载自 Triathlon 俱乐部 】
发信人: ironman2015 (ironman circa 2015), 信区: Triathlon
标 题: Bigfuzzydoug’s Ten Points to Swimming
发信站: BBS 未名空间站 (Thu Jan 13 09:23:59 2011, 美东)
Bigfuzzydoug’s Ten Points to Swimming:
http://www.beginnertriathlete.com/discussion/forums/thread-view
The key to swimming is reducing drag, not endurance or powering through the
water. This is not just my opinion; it is the law of physics. I’ll
explain it in a simple way: When you bike, you have to push air in front of
you ou... 阅读全帖 |
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t*******r
发帖数: 22634 | 29 同意 vertical flutter kick 很难。我觉得那个是 TI 教程有点误导
的地方，那个只是给大众看看。一般人先练习躺着 kick。俺个人觉得对大众
而言 vertical flutter kick 不是必须的。
我游泳的 YMCA pool，池比较浅，我都不敢让小孩做 vertical kick，
怕踢在池底伤了脚。。。 |
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c********n
发帖数: 1964 | 30 做了一点功课，总结如下：
kawai的baby grand （我指GE, GM models）是不怎么样。特别是soundboard用材不好, 而且没有tapered soundboard. 真正的grand piano的soundboard 必须有tapered edges. 这样soundboard 能够更自由的震动。Kawai的grand piano从RX 系列才开始用好的soundboard. (注：RX-1虽然和GM-30体积一样，但是用材好很多，soundboard工艺也上了一个台阶，所以可以归于小grand piano，而不是baby grand.) 所以，kawai的baby grand事实上还不如professional vertical piano，可能只是和studio vertical piano 在一个档次上。
可惜的是昨天去看琴，店里刚好没有kawai 的 baby grand或grand。没能亲身体验一下。
非常能体会斑竹的心情。有几次老师让我溜进recital hall弹了2个小时的6尺新
steinway，再弹琴房里的破破老vertical stei |
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z***x
发帖数: 851 | 31 来自主题: Collectibles版 - 菜鸟请教2 邮票图案不在中间，切的时候off center，两边margin 不一样。 这几张都是。美国早
期邮票这样的很多，
copied from some website:
Grade is about centering, cancels and gum. Grade describes
how well the stamp's design is centered between the
perforations*, both horizontally and vertically, on the paper,
and the condition of the gum for mint stamps, or the effect of
the cancellation on used stamps. (*or margins in the case of
imperforates)
Grades are meted out like school exam scores: "superb" all
the way down to "poor," but an adequate descr... 阅读全帖 |
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z***i
发帖数: 1122 | 32 大幅摄影因为有tilt/shift,可以做到两边的楼垂直:
如果用135,没有tilt/shift镜头应该用什么焦距?
以下器材5DII + 17-40mm/f4.光从透视,变形来看,大概什么焦距最接近上边这张的感觉?
是不是24mm TSE是最好的选择?
17mm, no correction
17mm, photoshop vertical -75
28mm, no correction
28mm, photoshop vertical -30
40mm, no correction
40mm, photoshop vertical -6
这个测试不太标准,28mm, 40mm应该先向后退,再照,使得最后构图一致,但当时没想到那
么多... |
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z***i
发帖数: 1122 | 33 多谢！这下应该明白了。以前我还看到他的一个访谈，说的是这一张：
D: When I was taking your photograph earlier today, with well-intended
whimsy I tilted my camera in an attempt to make my own Winogrand. From what
I understand, that's not how it's done. What is the meaning of the
horizontal tilted frame that you often use? And is your camera tilted when
you make the picture?
W: It isn't tilted, no.
D: What are you doing?
W: Well, look, there's an arbitrary idea that the horizontal edge in a frame
has to be the point of reference.... 阅读全帖 |
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j********n
发帖数: 24 | 34 自从有了无敌兔，一直想用它拍电影。研究了很久，自己设计了一个便携式摄影移动器（HDolly Camera Slider Vertical），用起来感觉不错。:)
多做了一个放在三藩版的craiglist在卖。有兴趣的朋友请和我联系，也欢迎给我一些建议。谢谢了。
HDolly Camera Slider Vertical is a camera slider or glider offers film
makers a portable camera dolly system. Made in USA. It provides vertical,
horizontal and angle mounting options on a tripod, light stands, table top,
floor or ground. The setup is easy. The roller bearing linear motion design
with brand name aluminum rail makes HDolly quiet, smooth and sturdy.
Mod |
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l*****e
发帖数: 8596 | 35 from wiki visual field
The normal human visual field extends to approximately 60 degrees nasally (
toward the nose, or inward) from the vertical meridian in each eye, to 100
degrees temporally (away from the nose, or outwards) from the vertical
meridian, and approximately 60 degrees above and 75 below the horizontal
meridian.[citation needed] In the United Kingdom, the minimum field
requirement for driving is 60 degrees either side of the vertical meridian,
and 20 degrees above and below horizon... 阅读全帖 |
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h*******g
发帖数: 10585 | 36 原帖地址： http://www.mu-43.com/f67/voigtlander-40mm-viewfinder-unboxing-10642/
Target distance = 3m
The centre of the viewfinder image is the black keyhole of the window on the
left.
Due to the vertical distance between the viewfinder and the taking lens, as
one approaches the target, parallax error will occur - anything vertically
centred in the viewfinder will move upwards from the taking lens'
perspective.
This is dead centre.
Target distance = 2.2m
Still vertically centred.
Target distance = 1.5... 阅读全帖 |
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z********4
发帖数: 1668 | 37 我一摄影师朋友近期需要购买一个显示器，用于给客户挑选照片（婚纱照）。要求如下
，麻烦各位大牛推荐：
I need my monitor to be:
1. Large – 42” is good
2. Wide viewing angle- two people (clients) need to be able to view it
sitting side by side
3. Must be able to rotate to vertical position because most of my images
are vertical and they show larger in vertical format.
4. High resolution to show details of the portraits.
5. Excellent color.
6. Price –$650. or less
个人觉得650买满足上述条件的有点难，麻烦懂行的朋友们看一下。谢谢啦！ |
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L*****y
发帖数: 4290 | 38 650连27寸的都买不下来吧
我一摄影师朋友近期需要购买一个显示器，用于给客户挑选照片（婚纱照）。要求如下
，麻烦各位大牛推荐：
I need my monitor to be:
1. Large – 42” is good
2. Wide viewing angle- two people (clients) need to be able to view it
sitting side by side
3. Must be able to rotate to vertical position because most of my images
are vertical and they show larger in vertical format.
4. High resolution to show details of the portraits.
5. Excellent color.
6. Price –$650. or less
个人觉得650买满足上述条件的有点难，麻烦懂行的朋友们看一下。谢谢啦！ |
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k********a
发帖数: 446 | 39 这篇文章里关于5D2的部分都不对啊。例如文章里说：
“5D MARKII只有中心点是十字对焦。而1Ds3是所有辅助对焦点以外都是十字对焦。而
这两款机型的十字对焦点配置均是一个横向F2.8的线性感应器+一个纵向的F5.6线性感
应器。”
“也就是说。即使5D2中心点是十字对焦。但是如果你配置的镜头光圈小于F2.8时（比
如F4）.那么，中心点也只能触发F5.6感应器的反差检测。此时你的中心点十字对焦依
然只能当一字对焦使用。不具备高精度。”
可是5D2 English Manual 里是：
【【5D2】】:
【With lenses whose maximum aperture is larger than f/5.6】
With the center AF point, cross-type AF (sensitive to both vertical and
horizontal lines) is possible.
【With lenses whose maximum aperture is larger than f/2.8】
With the center AF point... 阅读全帖 |
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d*****0
发帖数: 68029 | 41 sensor外的对焦系统是19点11个十字点，定价2800。。。
Sony Introduces New Full-Frame α99 Camera with Translucent Mirror
Technology and Dual AF System
Flagship α A-mount camera delivers new levels of image quality, focus
capabilities and video performance
SAN DIEGO, Sept 12, 2012 – Sony’s long awaited α99 digital camera sets a
new performance standard for professional-class DSLRs, combining all of the
benefits of full-frame imaging with the responsiveness and speed of
Translucent Mirror Technology.
The successor to S... 阅读全帖 |
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l*x
发帖数: 396 | 42 参考canon EF 50 vs EF 300, the ratio of Angle of View:
Diagonal: ~5.6 X
Horizontal: ~5.9 X
Vertical: ~5.9 X
Specifications Canon EF 50mm f/1.4 USM Lens
Focal Length Range 50mm
APS-C Sensor DSLRs Only? N
Lenses / Groups 7/6
Angle of View: Diagonal 46°
Angle of View: Horizontal 40°
Angle of View: Vertical 27°
Specifications Canon EF 300mm f/2.8 L IS II USM Lens
Focal Length Range 300mm
APS-C Sensor DSLRs Only? N
Lenses / Groups 16/12
... 阅读全帖 |
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r****a
发帖数: 1350 | 43
1. finding nontrivial upper and lower bounds of critical thresholds for
percolation on 3D lattice, and prove.
2. Prove the unsplittable multicommodity flow problem is NP-hard
3. With the additional constraint that for two given sets S1 and S2
of pairs of vertices, we need to ensure that every pair of vertices in S1 is
on the same side of the cut, while every pair of vertices in S2 is
separated by the cut, write new quadratic program and vector programs for
this constrained maximum cut problem a... 阅读全帖 |
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y*********u
发帖数: 14561 | 44 ☆─────────────────────────────────────☆
yanyan123456 (球球) 于 (Thu Oct 21 15:36:02 2010, 美东) 提到:
寄养的猫猫,最近开始到处挠东西.买了个专门的挠板,她也不挠,还是最爱我的沙发靠垫.
刚才想训练一下,就抱到板子前,按着爪爪模拟挠的动作,挠4,5下就给个treat,这么反复
了几次.好像她还是迷迷糊糊不知道什么意思.
请问有什么好的训练方法么?
☆─────────────────────────────────────☆
papayaleaf (木叶) 于 (Thu Oct 21 15:57:09 2010, 美东) 提到:
1. sprinkle some catnip onto the scratching post/mat
2. place the scratching post/mat next to the object you don't want him to
scratch. You may need to buy more than one.
3. some... 阅读全帖 |
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g****p
发帖数: 94 | 45 Let G = (V, E) be a weighted, directed graph with weight function w : E → {
1, 2, ..., W } for some positive integer W , and assume that no two vertices
have the same shortest-path weights from source vertex s. Now suppose that
we define an unweighted, directed graph G' = (V ∪ V', E') by replacing each
edge (u, v) ∈ E with w(u, v) unit-weight edges in series.
Questions：
1. How many vertices does G' have?
2. Now suppose that we run a breadth-first search on G'. Show that the order
in which vertic |
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c*********n
发帖数: 128 | 46 A graph {E, V}. The edges of the graph are assigned randomly between
vertices.
For two random vertices i and j, with degrees k_i and k_j, respectively,
what is the probablity that there is an edge between them?
I think the result is
k_i*k_j/m
where m is the total number of edges in the graph.
For any edge E, the probability that E is connecting vertices j is
k_j/m
Considering i is connected with k_i edges, then the probability is
k_i * (k_j/m)
But some paper gives
k_i*k_j/(2m)
What do you guys s |
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f**n
发帖数: 401 | 47 【 以下文字转载自 Programming 讨论区 】
发信人: fern (宝宝会翻身了), 信区: Programming
标 题: data structure for set of path in a graph
发信站: BBS 未名空间站 (Tue Mar 23 17:33:56 2010, 美东)
Suppose we have a one-directional graph. Define a path as a sequence of
vertices such that from each of its vertices there is an edge to the next
vertex in the sequence. So a path of three vertices would be recorded
somehow as v1->v2->v3.
Now I need to store a set of paths that are different from each other. For
example, path 1 is v1->v2->v |
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w***g
发帖数: 5958 | 48 how about this:
while graph not empty
do
pick a vertex V at random
for each pair of different U1, U2 in V's neighbors
do
if edge exists then emit triangle {V, U1, U2}
done
remove V from graph
done
It's not O(N^3), but O(ND^2), D=maximal degree.
One refinement of the algorithm would be to eliminate vertices according to
ascending order of degree, and keep that order as you remove vertices. At
each loop, the removal of one vertex will cause the degree of a few vertices
(the number is m |
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z********4
发帖数: 1668 | 49 我一摄影师朋友近期需要购买一个显示器，用于给客户挑选照片（婚纱照）。要求如下
，麻烦各位大牛推荐：
I need my monitor to be:
1. Large – 42” is good
2. Wide viewing angle- two people (clients) need to be able to view it
sitting side by side
3. Must be able to rotate to vertical position because most of my images
are vertical and they show larger in vertical format.
4. High resolution to show details of the portraits.
5. Excellent color.
6. Price –$650. or less
个人觉得650买满足上述条件的有点难，麻烦懂行的朋友们看一下。谢谢啦！ |
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发帖数: 1 | 50 What Happened To GaN And SiC?
Early predictions were overly optimistic, but these technologies are
starting to make inroads.
About five years ago, some chipmakers claimed that traditional silicon-based
power MOSFETs had hit the wall, prompting the need for a new power
transistor technology.
At the time, some thought that two wide-bandgap technologies—gallium
nitride (GaN) on silicon and silicon carbide (SiC) MOSFETs—would displace
the ubiquitous power MOSFET. In addition, GaN and SiC were suppos... 阅读全帖 |
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