d**u
发帖数: 1639 | 1 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Mon Aug 11 08:59:18 2008) 提到:
search了一下版面，大家suggest去walmart，但是查了一下地图，walmart比较远。请
问有没有在Bala-Cynwyd附近的信誉较好的车铺，多谢了
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JackSheng (重新振作) 于 (Mon Aug 11 15:10:32 2008) 提到:
ding
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ukyo (橘右京) 于 (Tue Aug 12 20:40:57 2008) 提到:
say's auto
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JackSheng (重新振作) 于 (Tue Aug 12 21:21:56 2008) 提到:
多谢，请问地址是？ |
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b***k
发帖数: 2673 | 2 ☆─────────────────────────────────────☆
leephy (leephy) 于 (Tue Sep 16 23:57:58 2008) 提到:
If X is uniform distributed in (0,pi), what is E(X|sinX)?
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JackSheng (重新振作) 于 (Wed Sep 17 00:00:18 2008) 提到:
pi/2?
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ccca (cc) 于 (Wed Sep 17 18:16:22 2008) 提到:
I think pi/2 is correct.
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JackSheng (重新振作) 于 (Wed Sep 17 20:40:50 2008) 提到:
why?
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b***k
发帖数: 2673 | 3 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 02:34:20 2009, 美东) 提到:
this one is pretty standard, from another i-bank
which one is larger, e^\pi or \pi^e?
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pcasnik (pcasnik) 于 (Fri Jun 19 10:38:42 2009, 美东) 提到:
for x>0, ln(x)/x gets its maximum at x=e.
hence ln(e)/e > ln(pi)/pi, i.e., e^pi > pi^e.
or use e^x>1+x, and take x=pi/e-1.
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JackSheng (重新振作) 于 (Fri Jun 19 20:34:18 2009, 美东 |
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b****g
发帖数: 1912 | 4 ☆─────────────────────────────────────☆
Zeratul (坚决不吵架) 于 (Tue Dec 16 09:40:38 2008) 提到:
Bless
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JackSheng (重新振作) 于 (Tue Dec 16 09:41:45 2008) 提到:
男人真惨，内外受气
bless
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xianqian (闲钱一点点) 于 (Tue Dec 16 09:44:09 2008) 提到:
不是受气，安慰性质，本人无心。
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zilch (Zilch Jr) 于 (Tue Dec 16 09:58:11 2008) 提到:
次数和频率有什么区别？请举例。
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xianqian (闲钱一点点) 于 (Tu |
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j******e
发帖数: 50 | 5 It's a post-doc job.
JackSheng, Do you know how much cost each month? |
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c*********t
发帖数: 30088 | 7 suwen：西南三日游，文字约2800字，奖励伪币100
感谢下列ID为活动做的捐款！
Suchelicht，13-08-2009, 888.00
FlyUpLife , 06-08-2009，20.00
FlyUpLife, 06-08-2009，80.00
MyCottage，06-08-2009，50.00
JackSheng，06-08-2009，10.00
suwen，06-08-2009，50.00
segawang，06-08-2009，50.00 |
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J*******g
发帖数: 267 | 10 来自主题: Mathematics版 - 问个问题 【 以下文字转载自 Quant 讨论区 】
发信人: JackSheng (重新振作), 信区: Quant
标 题: 问个问题
发信站: BBS 未名空间站 (Sat May 16 22:59:30 2009), 转信
证明matrix inversion和matrix multiplication是equivalent in terms of
complexity？
I can show one direction (realize matrix multiplication using matrix
inversion) but got stuck on the other direction. Someone assured me that
the other direction is true too. Any thoughts? |
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B*********h
发帖数: 800 | 11 ☆─────────────────────────────────────☆
progress2007 (progress@2007) 于 (Sat Mar 3 15:31:36 2007) 提到:
谁有经验介绍一下前台的情况吧，比如主要职责，工作时间，压力大小，要求技能，所
需教育背景和工作经历等等，大家讨论讨论，撞点儿火花出来。
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bysz (bysz) 于 (Sun Mar 4 18:57:06 2007) 提到:
不同group职责，时间，技能差别很大。干这行，时间是不可能少的，front office直
接跟钱打交道，压力自然大很多，出大岔子马上就被fire了，more challenging, more
promising, 当然淘汰率也更高。
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JackSheng (快乐每一天) 于 (Sun Mar 4 19:08:16 2007) 提到:
the career of thos |
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b***k
发帖数: 2673 | 12 ☆─────────────────────────────────────☆
littleegg (爱吃茶叶蛋) 于 (Wed Jul 9 09:09:24 2008) 提到:
what is the expected number of random numbers, uniformally distributed from
0 to 1 needed for the sum to be greater than 1?
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JackSheng (重新振作) 于 (Wed Jul 9 09:33:23 2008) 提到:
e
from
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littleegg (爱吃茶叶蛋) 于 (Wed Jul 9 10:05:01 2008) 提到:
but sum(n*P(N=n)) does not seem to be a finite number. not e either!
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b***k
发帖数: 2673 | 13 ☆─────────────────────────────────────☆
magnitude (难以释怀) 于 (Sun Aug 3 15:24:13 2008) 提到:
有做 Forcasting Modle的么?工作好做么?该看些什么书?
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stoneyl (stone) 于 (Mon Aug 4 06:31:12 2008) 提到:
u mean "forecasting model"
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stoneyl (stone) 于 (Mon Aug 4 06:57:18 2008) 提到:
u mean "forecasting model"
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JackSheng (重新振作) 于 (Mon Aug 4 09:15:49 2008) 提到:
forecasting what?
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b***k
发帖数: 2673 | 14 ☆─────────────────────────────────────☆
jejune (孑孓) 于 (Mon Oct 20 04:02:45 2008) 提到:
微分方程
dx/x=a*dy/y+dw(t)
a是常数，x,y是随机过程，w(t)是weiner process.
它的积分形式是什么？就是说
dln(x)=a*dln(y)+ ?
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JackSheng (重新振作) 于 (Mon Oct 20 13:39:29 2008) 提到:
I thought dln(x) =\= dx/x, if x is a stochastic process, actually dx/x = dln
(x) + (dx)^2/(2 x^2)
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jejune (孑孓) 于 (Wed Oct 22 02:08:10 2008) 提到:
you are right. otherwise it won't b |
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b***k
发帖数: 2673 | 15 ☆─────────────────────────────────────☆
moyuecha (抹月茶) 于 (Sat Oct 25 04:30:33 2008) 提到:
已知m(t)时间的函数 且满足以下条件
m'(t)-bm(t)=a m(t)一阶导数减其本身 得到常数a (b is constant)
m(0)=x
请问 m(t) 的函数是什么形式呢
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smilenuts (smilenuts) 于 (Mon Oct 27 02:02:50 2008) 提到:
It's just a regular affine ODE and more generally you can solve for am'' + bm' + c m = d.
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JackSheng (重新振作) 于 (Mon Oct 27 08:34:35 2008) 提到:
multiply both sides with ex |
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m*******e
发帖数: 15 | 16 1. you don't need to pay to renege offer
2. I think that's GS CVA desk strategist.
3. GS EM desk trades EM FX, EM rates and exotics
CVA desk stratesgist is a typical quant role, you will learn a lot of
correlation and modeling stuff
obviously EM desk quant is the best choice,I know last year EM new york was
looking to hire some phds |
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p****u
发帖数: 2596 | 17 what is this post about?? where is the original water??
was |
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b***k
发帖数: 2673 | 20 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 00:09:32 2009, 美东) 提到:
I have been trying to post my interview experience, but found it quite tedious to write down the procedure in one post, so I would rather put down the questions individually in posts. Here is one from an "investment bank". Well, you guess which one i
You are asked to store a symmetric matrix of, say integers, efficiently. All you know about the matrix is that it is symmetric. Please write me a func |
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b***k
发帖数: 2673 | 21 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 02:33:24 2009, 美东) 提到:
this question from an i-bank, still, you guess which one
how many subsets does {1, 2, ..., n} have that contains no consecutive
integers? for example, {1, 2} not okay, while {1, 3, 5} okay.
think recursion
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daj (肉丝炒饭--小吵肉fan) 于 (Fri Jun 19 14:39:01 2009, 北京) 提到:
赛 。。。
没找到感觉 .....
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accessto (11) 于 (Fri Jun 19 02: |
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b***k
发帖数: 2673 | 22 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 02:39:03 2009, 美东) 提到:
this one is also from an i-bank
given a length-n array of real numbers (either positive or negative), find
the contiguous sub-array of maximum sum in linear time
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daj (肉丝炒饭--小吵肉fan) 于 (Fri Jun 19 14:44:42 2009, 北京) 提到:
谢谢
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ChinaTian (Work on my dream) 于 (Fri Jun 19 09:37:43 2009, 美东) 提到:
good, mark
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b***k
发帖数: 2673 | 23 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 02:44:53 2009, 美东) 提到:
this one is too standard ...
a unit-length stick, broken into three pieces at two uniformly randomly
selected points. what is the probability that the three pieces can form a
triangle.
i know i know this is tooooold, please bear with me, just for the record
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xmly (xmly) 于 (Fri Jun 19 04:22:41 2009, 美东) 提到:
tooold我还是不知道答案
ft
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b***k
发帖数: 2673 | 24 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 02:48:58 2009, 美东) 提到:
this one is from an i-bank
given an Gaussian random number generator, how would you estimate \pi?
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daj (肉丝炒饭--小吵肉fan) 于 (Fri Jun 19 15:02:01 2009, 北京) 提到:
gaussian a ?
orz......
正反 distribution to get a uniform ?
这个以前没见到过
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netghost (Up to Isomorphism) 于 (Fri Jun 19 04:22:35 2009, 美东) 提到:
Just let Z=sqrt(X^2+Y^ |
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b***k
发帖数: 2673 | 25 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 20:43:46 2009, 美东) 提到:
question from an i-bank
write a function, with a directed graph as the input, output whether the
graph contains a path that passes all vertices exactly once (a.k.a.
Hamiltonian path)
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Jadeson (Jadeson) 于 (Fri Jun 19 21:00:33 2009, 美东) 提到:
你这个是电话面试还是on site?
我看你前几个问题都象是电面啊。
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swordmans (风云第一刀) 于 (Fri Jun 19 22:00: |
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b***k
发帖数: 2673 | 26 ☆─────────────────────────────────────☆
JackSheng (重新振作) 于 (Fri Jun 19 21:01:08 2009, 美东) 提到:
question from an i-bank
suppose there are k denominations in a coin system, denoted as d_1, ..., d_k
. give me an efficient algorithm that makes an amount of n using as few
coins as possible.
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swordmans (风云第一刀) 于 (Fri Jun 19 21:59:47 2009, 美东) 提到:
Dynamics programming, and for some special cases, Greey method may work
_k
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b***k
发帖数: 2673 | 27 ☆─────────────────────────────────────☆
miernikcx (nik) 于 (Wed Oct 14 18:10:01 2009, 美东) 提到:
在两张纸A,B上分别随机写两个数字，两个数字不相等。所以猜对哪个大的概率为1／2
。
现在随机翻开A或者B，再猜A或者B上哪个数字大。设计一种策略使得你猜对的概率大于
1/2。
我没什么思路，有知道的给点思路么？
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JackSheng (重新振作) 于 (Wed Oct 14 18:18:30 2009, 美东) 提到:
呵呵，这道题也大众化了。。。
2
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california11 (加州) 于 (Wed Oct 14 18:33:53 2009, 美东) 提到:
请问怎么做
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simple1987 (simple) 于 (Wed O |
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m*********k
发帖数: 10521 | 28 [NextGeneration] snowforever May 18 ● 为宝爸求祝福发400个包子
10*400=4000
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m*********k
发帖数: 10521 | 29 [MedicalCareer] yugan2005 May 24 ● 求助 500个包子 国内朋友的母亲需要处
方药治疗?
10*500=5000
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m*********k
发帖数: 10521 | 30 "[Military]TempBM Oct 31. ● （过十万，再接再励！）众志成城，白宫请愿
签名需要你"
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