k***t
发帖数: 57 | 1 二维sample 求出EX EY和Covariance matrix
由EX EY得到confidence ellipse的中心后 该如何实现方向，大小和相关程度的控制(
例如68% confidence ellipse)
哪位朋友能给讲解一下 或者介绍个网上资料看 谢谢了
类似的问题
直到conf. ellipse 能否算出cov matrix
在什么情况下可以算出
谢谢了 |
|
r*******y
发帖数: 1081 | 2 an other question:
After I graph this ellipse, I want to graph serval points on
this ellipse, for example (1.02, 0.39), (0.95, 0.32), (0.87, 0.27)
using * to denote these points. How can I do this job in mathematica.
In matlab, we can use "hold" to plot on the same figure frame. But
I have no idea in mathematica.
Thanks. |
|
p******u
发帖数: 30 | 3 发信人: YYalone (简单就是幸福), 信区: IQDoor
标 题: 100个著名初等数学问题 （41－60）
发信站: 两全其美网 (Fri May 25 15:52:56 2007), 本站(lqqm.net)
第41题 阿尔哈森弹子问题Alhazen's Billiard Problem 在一个已知圆内，作出一
个其两腰
通过圆内两个已知点的等腰三角形.
第42题 由共轭半径作椭圆An Ellipse from Conjugate Radii 已知两个共轭半
径的大
小和位置，作椭圆.
第43题 在平行四边形内作椭圆An Ellipse in a Parallelogram, 在规定的平
行四边形
内作一内切椭圆，它与该平行四边形切于一边界点.
第44题 由四条切线作抛物线A Parabola from Four Tangents 已知抛物线的四
条切线
，作抛物线.
第45题 由四点作抛物线A Parabola from Four Points. 过四个已知点作抛物
线.
第46题 由四点作双曲线A Hyperbola from Four Points. 已知直角（等 |
|
b******g
发帖数: 3883 | 4 http://social.msdn.microsoft.com/Forums/sqlserver/en-US/bda433a
Steps:
1. Click on package properties. Set "DelayValidation" property to True.
The package will not validate tasks, connections, until they are executed.
2. Create a package level variable "XLFileRootDir" as string and set it to
the root
directory where you want the excel file to be created.
Example: C:\Project\Data\
3. Create an Excel connection in the connection manager. Browse to the
target directory
and select the destination XL... 阅读全帖 |
|
o******r
发帖数: 259 | 5 厚脸皮吱一声，
其实我是搞image processing地，
以前。
而且我还做过你的这个问题。
就如前楼所说，
你要先作segmentation,
方法一把一把的，
那个digital image processing是bible,
很多image segmentation paper也可以参考
然后捏是ellipses recognition
就是拿ellipses方程往你的segmentation结果上套
本来我还想攒个conference paper,
没啥新意才作罢。 |
|
w**l
发帖数: 5 | 6 I am surprised that these CS guys are so ignorant of Math. If my understanding
is correct, this is almost a high shool level problem. If his ellipse means
the quadratic surface, then just solve the joint equations:
1. (x-x0)'A(x-x0)=1
2. x=x1+t*(x2-x1)
where A is a square matrix, x0 is the center of the ellipse, x1 and x2 are two
points on the line. Plug 2 into 1, it remain to check whether the following
eqaution about t has solution:
[x1+t*(x2-x1)]'A[x1+t*(x2-x1)]=1
which is a quadratic functio |
|
a*********3
发帖数: 660 | 7 定义 definition变量 variable面积 area直径 diameter半径 radius公式 formula
单价 unit price范围 range/scope/extent集合 set法则 principle本金 principal利
率 interest rate利息 interest单利 simple interest复利 compound interest正数
positive number负数 negative number解析式 analytic expression分类讨论
classified discussion性质 nature （不是很确定）奇函数 odd function偶函数
even function对称 symmetric坐标原点 origin单调性 monotonicity（不是很确定）
任意 random周期性 periodic 有界性 boundedness 数学 mathematics, maths(BrE)
, math(AmE) 公理 axiom 定理 theorem 计算 calculation 运算 operat... 阅读全帖 |
|
|
w*********g
发帖数: 30882 | 9 请聆听上帝通过重大事件传达的巨大脚步声吧
====================================================
美國國家聖誕樹倒了
发信站: BBS 未名空间站 (Mon Feb 21 21:42:08 2011, 美东)
http://www.nytimes.com/2011/02/20/us/20tree.html?_r=1&hp
February 19, 2011
Winds Topple National Christmas Tree
By EMMARIE HUETTEMAN
WASHINGTON — High winds whipped through the metropolitan Washington area on
Saturday, downing
power lines, fueling brush fires and even toppling the National Christmas
Tree.
The National Weather Service had issued a high wind warning for... 阅读全帖 |
|
J**i
发帖数: 166 | 10 Since completing the Astronomia nova, Kepler had intended to compose an
astronomy textbook.[53] In 1615, he completed the first of three volumes of
Epitome astronomia Copernicanae (Epitome of Copernican Astronomy); the first
volume (books I-III) was printed in 1617, the second (book IV) in 1620, and
the third (books V-VII) in 1621. Despite the title, which referred simply
to heliocentrism, Kepler's textbook culminated in his own ellipse-based
system. The Epitome became Kepler's most influential ... 阅读全帖 |
|
p**********d
发帖数: 7918 | 11 http://www.nytimes.com/2011/02/20/us/20tree.html?_r=1&hp
February 19, 2011
Winds Topple National Christmas Tree
By EMMARIE HUETTEMAN
WASHINGTON — High winds whipped through the metropolitan Washington area on
Saturday, downing
power lines, fueling brush fires and even toppling the National Christmas
Tree.
The National Weather Service had issued a high wind warning for the area,
cautioning that some gusts
could reach 60 miles per hour.
No one was reported injured from the fires in Montgomery Coun... 阅读全帖 |
|
|
u****u
发帖数: 229 | 13 Omac_1_man_army_corps • 15 hours ago
The Muslim Game:
In an effort to portray their religion as non-violent, Muslim apologists
vigorously employ verse 5:32, which would appear to promote a universal
principal that all life is sacred to Allah - especially the way it is
typically quoted by apologists:
"…if any one slew a person… it would be as if he slew a whole people; and
if any one saved a life, it would be as if he saved the life of a whole
people…"
(As quoted by the Fiqh Council of Nort... 阅读全帖 |
|
|
b***p
发帖数: 1398 | 15 查看Medtronic and ellipse growing rod for scoliosis |
|
b***p
发帖数: 1398 | 16 查看Medtronic and ellipse growing rod for scoliosis |
|
D******D
发帖数: 180 | 17 贴一个我们保险的policy，想问一下，以下各种lens的option，什么和国内的所谓的1.
67是一样的啊？专业名词都看不懂啊。
Lens
Single Vision $25 Copay
Bi-focal $25 Copay
Tri-focal $25 Copay
Standard Progressive Lens $90 Copay
Premium Progressive Schedule 1
Adaptar Digital/Short , Natural Digital , Ovation Digital , Small Fit/
Digital , Amplitude IQ , GP Wide , Proceed II/III , Genesis , Piccolo ,
Gradal Top , Instinctive HD , Synchrony , Adage , Concise , EOS... SEE YOUR
PROVIDER FOR A COMPLETE LIST $110 Copay
Premium Progressive... 阅读全帖 |
|
n********r
发帖数: 4558 | 18 Nothing. Ellipse orbit needs only one mass center, which
could be in either of the two positions. |
|
n********r
发帖数: 4558 | 19 That is why the object in the ellipse orbit always slows down
around the other center, trying to find out what is there. |
|
p**********9
发帖数: 3463 | 20 我们定了 3/31 eastern carribean， Celebrity Ellipse，
这个船是他家最大最新的
， 如果有朋友碰巧想一起去，会热闹些， 请站内。 |
|
m******p
发帖数: 5393 | 21 那就以白宫那中轴线把national mall一分为二，一天西半区，一天东半区悠哉悠哉就
闲逛完了
主要怕这几天过节人多。。Ellipse那一圈儿肯定抢不到车位啦是吧 |
|
s*******a
发帖数: 6 | 22 我5月中旬回国，房子签到9月份
我的房是HELIX-ELLIPSE的，在47街和12街，交通方便，步行10分钟到华大校区
1层得LOFT,1楼客厅厕所厨房，有个小YARD。
2楼是卧室WALK-IN CLOSET还有一个厕所，面积差不多800左右。
现在的租金是1499，6月到9月转租，价格面议
有兴趣的请EMAIL联系，z************[email protected]
或电话4256478737，联系人Eason Zhang
非诚勿扰 |
|
|
d*i
发帖数: 9453 | 24 ☆─────────────────────────────────────☆
westwind2006 (西风狂舞) 于 (Wed Dec 12 21:47:37 2007) 提到:
这两天因为腿上有伤，就改练椭圆机和划船机了。现就跑步，椭圆机和划船机做个比较。
monday: running
35min, cal 497, distance 4mile
tuesday: ellipse
35min, cal 653, distance 2.1mile, resistance 30-35
wedensday: boating
35min, cal unknown, distance 6300m, strok/m 30-40
感觉：跑步最爽，椭圆机最耗热量，划船机最适合女士（有氧，力量不大，肌肉部位：
胸，胳膊，腰，臀部）。
☆─────────────────────────────────────☆
mark (花生，微爷远爷的爸爸) 于 (Wed Dec 12 22:09:18 2007) 提到:
running is the only one you can |
|
t***k
发帖数: 610 | 25 I remembered the ellipse has a little fan on it you can use |
|
J****0
发帖数: 2400 | 26 Jogging is boring. Watching Chinese soap opera on an ellipse machine is
the way to go.
balls...
two
it |
|
p***r
发帖数: 20570 | 27 nobu HK. 看样子也不算太贵啊。
COLD DISHES
NOBU SPECIAL COLD APPETIZERS
Ceviche Lobster / Seafood / Tomato 180 / 190 / 120
Hirame Sashimi with XO Salsa 220
Hot Miso “Chips” Tuna and Scallops (4 pcs) 120
Inaniwa Pasta Salad with Lobster 285
Mirugai with Red Jalapeño and Coriander Dressing 290
NOBU Sashimi Tacos – Tuna, Salmon, Lobster and Crab (4 pcs) 160
Octopus Carpaccio with Dried Miso 180
Saga Beef Tacos (4 pcs) 220
Seared Toro with Jalapeño Dressing 398
Toro Tataki with Yuzu Miso 398
Tuna... 阅读全帖 |
|
b*s
发帖数: 82482 | 28 当然小说不会直说了，那个时代嘛。
关于McKee:
This would be the end of chapter two, before he meets, and falls instantly
in love with, Gatsby. He is in Manhattan with Tom, who wanted Nick to meet
“his girl,” Myrtle. They are at Myrtle’s apartment with her sister
Catherine (“Her eyebrows had been plucked and then drawn on again at a more
rakish angle,” we are told, “but the efforts of nature toward the
restoration of the old alignment gave a blurred air to her face.”) and some
neighbors, Mr. and Mrs. McKee—the forme... 阅读全帖 |
|
d********1
发帖数: 2462 | 29 会啊，我的驾照在钱包里，有几次开了半天，等要付钱了发现钱包没带，还无驾照开了
半天，真的很无语；）。。你要走那么多路啊？我基本就是车库到门口，停车场到门口
的路，gym踩ellipse原地踏步啊，我对鞋子不挑的，每样2-4双，都是平价的，
nordstrom rack或者是6pm淘来的，穿的最多的是球鞋，40块一双那种，还从来没穿烂
过呢：）。。你看那个tiffany的早餐里面，人家穿什么鞋子啊？（眼馋下，估计好看
不好穿诶：）。。 |
|
|
w*****w
发帖数: 28 | 31 詹姆斯.麦克斯韦
(James Clerk Maxwell, 1831-1879)
1831年6月13日, 英国物理学家詹姆斯.麦克斯韦(James Clerk Maxwell)出生在苏格兰
东南部的爱丁堡(Edinburgh, Scotland).麦克斯韦是独生子, 在中等阶级的家庭中长大
. 他的父亲(John Clerk)是位律师.
1841年, 即10岁时, 他在爱丁堡专科院校(Edinburgh Academy)开始正式上学, 并年仅
15岁时就发表了他第一份科学报告 — 有关椭圆(ellipse)的数学分析.
1847年(16岁时), 他进入爱丁堡大学(University of Edinburgh), 再发表了两份科学
报告. 1850年, 他以卓越成绩考进剑桥大学(Cambridge University)的数学系, 以一等
优异成绩毕业后, 便在剑桥大学任教.1856年, 麦克斯韦离开剑桥大学, 回到苏格兰,
并在阿伯丁的马里斯克学院(Marischal College in Aberdeen)任物理教授. 1857年,
他对土星光环的研究报告使他荣获剑桥大学的亚当斯 |
|
G******e
发帖数: 9567 | 32 http://sandwichesforsale.blogspot.com/2010/10/sir-william-mitch
In my last blog entry, we discovered Simon Greenleaf was not converted from
atheism to Christianity despite the numerous claims by Christian apologist
after apologist. In fact, if you search “Simon Greenleaf atheist” in
Google, you will find reams of pages, all with Christians gleefully stating
this. All wrong.
Another claimed conversion is that of Sir William Mitchell Ramsay. While I
was at, I decided to confirm this claim, and gue... 阅读全帖 |
|
j*******7
发帖数: 6300 | 33 http://www-scf.usc.edu/~kallos/what_is_real.htm
What is real?
Take for example the first successful theory of gravity, Ptolemy's system of
epicycles. It was used before Newton to describe the motion of the planets,
by assuming that the earth was static in the center of the world and the
planets and the sun revolved around it. It gave relatively accurate results
for astronomical observations. Was it real? I guess not. It just helped the
calculations, correctly, to be carried out.
Then Newton's th... 阅读全帖 |
|
a***u
发帖数: 383 | 34 请教一个问题：怎样从gml文件中提取数据？
比如下面这个gml文件，我想把node的信息读出来并存到一个java的类中。用什么方法
可以读
取出来呢？
graph
[
label ""
directed 1
node
[
id 0
label "fre.."
graphics
[
x 98.0
y 289.0
w 20.0
h 20.0
type "ellipse"
fill "#FFFF00"
outline "#000000"
]
idMap "Species: free basolateral
BSP"
typeMap 1
|
|
a***u
发帖数: 383 | 35 请教一个问题：怎样从gml文件中提取数据？
比如下面这个gml文件，我想把node的信息读出来并存到一个java的类中。用什么方法
可以读
取出来呢？
graph
[
label ""
directed 1
node
[
id 0
label "fre.."
graphics
[
x 98.0
y 289.0
w 20.0
h 20.0
type "ellipse"
fill "#FFFF00"
outline "#000000"
]
idMap "Species: free basolateral
BSP"
typeMap 1
|
|
z****e
发帖数: 54598 | 36 填充跟图形本身无关
你可以用来填充线或者圆形或者你想要什么图形都可以
问题在于，你如何画出这个图形来
如果是不规则的多边形
用polygon应该就可以了
以下是shape的实现类列表，找你喜欢的
Arc, Circle, CubicCurve, Ellipse, Line, Path, Polygon, Polyline, QuadCurve,
Rectangle, SVGPath, Text |
|
m**s
发帖数: 221 | 37
what
Thank you whkylp, i think most of them are round, or ellipses, but my
problem is that i don't have any backgroud about graphic programming. So,
could you suggest me some books to read? Thank you very much! |
|
g*****y
发帖数: 7271 | 38 这不就是circle和ellipse应该 who derived from who 的讨论么？ |
|
l**********n
发帖数: 8443 | 39 The following SVG elements are supported in React.DOM.*:
circle clipPath defs ellipse g image line linearGradient mask path pattern
polygon polyline radialGradient rect stop svg text tspan |
|
p****e
发帖数: 468 | 40 You can find the slopes of the two tangent lines starting from
any point on the line. If the slopes of the line is b/w these two
slopes, then the line intersect the ellipse. |
|
m**********d
发帖数: 1818 | 41 thanks
but how to find the ellipse which has the same second-moments as this region
???
is there only one answer? |
|
l********a
发帖数: 1154 | 42 cluster啊,annotation('ellipse',[x y w h])看看help就行
不过一般cluster都用circle就行了吧,没必要非椭圆啊 |
|
j**u
发帖数: 6059 | 43 ☆─────────────────────────────────────☆
quanqian123 (quanqian123) 于 (Tue Jul 26 12:19:15 2011, 美东) 提到:
想画出这样的圆环，感觉应该是用某一个函数画的，但是查了好久也没查到，请大牛们
指点一下，谢谢^_^
☆─────────────────────────────────────☆
jzxu (自然) 于 (Tue Jul 26 18:08:41 2011, 美东) 提到:
contour()?
☆─────────────────────────────────────☆
quanqian123 (quanqian123) 于 (Tue Jul 26 22:13:29 2011, 美东) 提到:
我试过contour，不行
☆─────────────────────────────────────☆
theds (tds) 于 (Wed Jul 27 01:24:39 2011, 美东) 提到:
contourc ?
☆──────────... 阅读全帖 |
|
a***n
发帖数: 578 | 44
no. It is not a polymer that containing C60. It is polymerized C60. kind of
hot in carbon technology.
Here is a paper related to C60 polymer.
"Debye-Scherrer ellipses" from 3D fullerene polymers: An anisotropic pressure
memory signature
SCIENCE
283 (5408): 1720-1723 MAR 12 1999
终
harder
observed
指
新
有
聚
合 |
|
h**********c
发帖数: 4120 | 45 写了一篇小文章，computational geometry方面的，
哪位牛人肯给看看，point to ellipse distance: a binary search approach,
有matlab的code
我老板不是搞这个方向的，这纯属于个人利用假期搞的，忙了一春假。
请牛人看看够不够发篇文章，latex 一共２１页。
如果能发在权威刊物最好，不行发哪个的大学的学报上也行。我现在很需要发文。
节选若干。
愿意帮忙请留言或站内方式联系。 |
|
g****t
发帖数: 31659 | 46 你的方法比牛顿法好？
写了一篇小文章，computational geometry方面的，
哪位牛人肯给看看，point to ellipse distance: a binary search approach,
有matlab的code
我老板不是搞这个方向的，这纯属于个人利用假期搞的，忙了一春假。
请牛人看看够不够发篇文章，latex 一共２１页。
如果能发在权威刊物最好，不行发哪个的大学的学报上也行。我现在很需要发文。
节选若干。
愿意帮忙请留言或站内方式联系。 |
|
c*******h
发帖数: 1096 | 47 The distance from a point (x,y) to an ellipse (x/a)^2 + (y/b)^2 = 1 is
ya^2*sin(t) + xb^2*cos(t)
- -----------------------------
a^2*sin^2(t) + b^2*cos^2(t)
where t satisfies
x^2+y^2-a^2-b^2
sin(2t+s) = ---------------------------------------
sqrt[ 4x^2y^2 + (b^2-y^2-a^2+x^2)^2 ]
and s satisfies
2xy
cos(s) = ---------------------------------------
sqrt[ 4x^2y^2 + (b^2-y^2-a^2+x^2)^2 ]
b^2-y^2-a^2+ |
|
b***e
发帖数: 1419 | 48 The first one is just a ellipse right? In that case, just compute the angle
of the plane with the cylinder. Quarter cirle and half circle is the same. |
|
