A*******s
发帖数: 23 | 1 send resume to a****************[email protected]
Hardware Systems Integration Engineer
Sr. HW Systems Integration Engineer
Hardware Systems Integration Engineer
Hardware Systems Integration Engineer
Hardware Systems Integration Engineer
Hardware Design Engineer
Hardware System Integrator
Hardware Systems Integration Engineer
Hardware System Integrator
Hardware Systems Integration Engineer
Job Number: 26059622Santa Clara Valley, California, United
StatesPosted: Jun. 26, 2013Weekly Hours: 4... 阅读全帖 |
|
m******t
发帖数: 273 | 2 【 以下文字转载自 Quant 讨论区 】
发信人: myregmit (myregmit), 信区: Quant
标 题: solve integral eq. embeeded with another integral eq.
发信站: BBS 未名空间站 (Sun Mar 23 14:20:18 2014, 美东)
I need to solve an integral equation embedded with another integral equation
by python 3.2 in win7.
There are 2 integral equations.
The code is here:
import numpy as np
from scipy.optimize.minpack import fsolve
from numpy import exp
from scipy.integrate.quadpack import quad
import matplotlib.pyplot as plt
impor... 阅读全帖 |
|
m******t
发帖数: 273 | 3 【 以下文字转载自 Quant 讨论区 】
发信人: myregmit (myregmit), 信区: Quant
标 题: solve integral eq. embeeded with another integral eq.
发信站: BBS 未名空间站 (Sun Mar 23 14:20:18 2014, 美东)
I need to solve an integral equation embedded with another integral equation
by python 3.2 in win7.
There are 2 integral equations.
The code is here:
import numpy as np
from scipy.optimize.minpack import fsolve
from numpy import exp
from scipy.integrate.quadpack import quad
import matplotlib.pyplot as plt
impor... 阅读全帖 |
|
m******t
发帖数: 273 | 4 【 以下文字转载自 Quant 讨论区 】
发信人: myregmit (myregmit), 信区: Quant
标 题: solve integral eq. embeeded with another integral eq.
发信站: BBS 未名空间站 (Sun Mar 23 14:20:18 2014, 美东)
I need to solve an integral equation embedded with another integral equation
by python 3.2 in win7.
There are 2 integral equations.
The code is here:
import numpy as np
from scipy.optimize.minpack import fsolve
from numpy import exp
from scipy.integrate.quadpack import quad
import matplotlib.pyplot as plt
impor... 阅读全帖 |
|
m******t
发帖数: 273 | 5 I need to solve an integral equation embedded with another integral equation
by python 3.2 in win7.
There are 2 integral equations.
The code is here:
import numpy as np
from scipy.optimize.minpack import fsolve
from numpy import exp
from scipy.integrate.quadpack import quad
import matplotlib.pyplot as plt
import sympy as syp
lb = 0
def integrand2(x, a):
print("integrand2 called")
return x**(a-1) * exp(-x)
def integrand1(x, b, c):
print(... 阅读全帖 |
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s******1
发帖数: 969 | 6 A==Integrate[Cos[x]^2*Log[-a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x, Pi, 2*Pi}]:
Introduce y=x-Pi so the range is [0,Pi].
Cos[x]=Cos[y+Pi]=-Cos[y]. Sin[x]=Sin[x+Pi]=-Sin[x].
A=Integrate[Cos[y]^2*Log[a*Cos[y] +Sqrt[1-a^2*Sin[y]^2]], {y,0, Pi}]
=Integrate[Cos[x]^2*Log[a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x,0, Pi}];
B==Integrate[Cos[x]^2*Log[-a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x, 0, Pi}];
Integrate[Cos[x]^2*Log[-a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x, Pi, 2*Pi}]
= A+B
=Integrate[Cos[x]^2*{Log[a*Cos[x] +Sqrt[1- |
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w******t
发帖数: 369 | 7 【 以下文字转载自 JobHunting 讨论区 】
发信人: wishlist (wishlist), 信区: JobHunting
标 题: Signal Integrity Characterization Engineer needed.
发信站: BBS 未名空间站 (Wed Mar 21 14:19:32 2012, 美东)
SIGNAL INTEGRITY CHARACTERIZATION ENGINEER
In this position, you will work in the centralized physical design
engineering group. You will be responsible for power delivery
characterization and correlation. You will work closely with circuit
designers and signal integrity engineers to characterize interfaces
connected to Nvidi... 阅读全帖 |
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g******n
发帖数: 339 | 8 For one dimensional integration, R has a function called integrate, but it
is for numerical integration, not for symbolic integration. R also has a
seperate multi-dimensional integration package. According to my experience,
R is not good in numerical interation in terms of ease of use and computing
efficiency compared to maple and matlab.
For symbolic integration, maple is definitely the best choice.
On the other hand, if you insist on doing this kind of thing using R, you
can create a function |
|
w*******y
发帖数: 60932 | 9 I know this doesn't sound like a 'deal' at first, but if you are a Sprint
mobile customer, there are several reasons why this news can save you money:
Free number porting to Google Voice((normally $20)
Free text messaging using the Google Voice app on Android or iPhone
Incredibly cheap international calls without having to launch Skype or
similar service
I will be updating this post with more information soon...
Link
Lifehacker Article:
http://lifehacker.com/#!5783812/google-voice-integrates-wit... 阅读全帖 |
|
w******t
发帖数: 369 | 10 SIGNAL INTEGRITY CHARACTERIZATION ENGINEER
In this position, you will work in the centralized physical design
engineering group. You will be responsible for power delivery
characterization and correlation. You will work closely with circuit
designers and signal integrity engineers to characterize interfaces
connected to Nvidia GPUs and mobile chips, including PCIe, DDR memory, HDMI,
DP, DAC and USB. Candidate will also be responsible for development of
validation procedures and SI model corre... 阅读全帖 |
|
H**********R
发帖数: 12 | 11 There are three positions open at Hana Innosys in Milpitas. Please see JD
below and reply to j*********[email protected] if you are interested and
think you are qualified.
Hana Innosys ( www.hanainnosys.com) is looking for energetic, creative S/W
Engineer, PM, SQA to join our solution integration team. HANA Micron's(www.
hanamicron.com) success in Semiconductor and Digital Industry is already
proven, and we're expanding our business to solution integration - Hana
Innosys. This team will be des... 阅读全帖 |
|
l******9
发帖数: 579 | 12 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: solve equations of integrals in python
发信站: BBS 未名空间站 (Fri Mar 21 12:21:31 2014, 美东)
I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, ... 阅读全帖 |
|
w********1
发帖数: 3492 | 13 Mon, 11 Jun 2012 11:57:40 PDT
At today's WWDC keynote event, Apple announced the next version of its
operating system for the iPad, iPhone, and iPod touch. iOS 6 will feature
new functionality for Siri, Facebook integration, a revamped Maps app,
Shared Photo Streams via iCloud, and more.
iOS 6 continues the rapid pace of innovation that is helping Apple reinvent
the phone and create the iPad category, delivering the best mobile
experience available on any device,” said Scott Forstall, Apple's se... 阅读全帖 |
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z***m
发帖数: 1602 | 14 请教个数学概念，能举个例子说明一下，某个函数是Riemann integrable 但不是
direct Riemann integrable 吗？Riemann integrable 和 direct Riemann
integrable 的主要区别是什么呢？ |
|
l******9
发帖数: 579 | 15 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: solve equations of integrals in python
发信站: BBS 未名空间站 (Fri Mar 21 12:21:31 2014, 美东)
I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, ... 阅读全帖 |
|
l******9
发帖数: 579 | 16 【 以下文字转载自 Statistics 讨论区 】
发信人: light009 (light009), 信区: Statistics
标 题: solve equations of integrals in python
发信站: BBS 未名空间站 (Fri Mar 21 12:21:31 2014, 美东)
I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, ... 阅读全帖 |
|
l*******e
发帖数: 262 | 17 【 以下文字转载自 EE 讨论区 】
发信人: lazyhorse (lazyhorse), 信区: EE
标 题: Power Systems - Verification/Integration Engineer (all leve (转载)
发信站: BBS 未名空间站 (Fri Jul 13 14:45:45 2012, 美东)
发信人: lazyhorse (lazyhorse), 信区: JobHunting
标 题: Power Systems - Verification/Integration Engineer (all levels) at Qualcomm
发信站: BBS 未名空间站 (Fri Jul 13 14:45:25 2012, 美东)
Please check here for more details and resume online submission. https://
jobs.qualcomm.com/public/jobDetails.xhtml?requisitionId=1896212&page=
jobSearch, you ... 阅读全帖 |
|
s*****a
发帖数: 438 | 18 As a Data Integration Manager you will lead a team of developers in
implementation of integration solutions interconnecting variety of internal
and third-party systems. The projects support business automation and BI/
BigData applications. Working closely with business users and operations
personnel, you will gather requirements, define the scope, and manage
delivery of high quality software products. You will partner across teams to
address technical problems and ensure smooth solution implemen... 阅读全帖 |
|
a**********g
发帖数: 48 | 19 BEOL integration manager (Ref: S1322)
BEOL integration manager position is located in Taiwan. This position is
responsible for managing the next generation (1x node) FINFET BEOL projects.
Specific responsibilities include:
1. Next generation (1x node) BEOL baseline process integration, test pattern
design and WAT data analysis.
2. SRAM yield improvement on BEOL issue.
3., BEOL process reliability Qualification
Qualification:
1. Ph.D. in Electrical Engineering or Materials Science and Engineering... 阅读全帖 |
|
a**********g
发帖数: 48 | 20 BEOL integration manager (Ref: S1322)
BEOL integration manager position is located in Taiwan. This position is
responsible for managing the next generation (1x node) FINFET BEOL projects.
Specific responsibilities include:
1. Next generation (1x node) BEOL baseline process integration, test pattern
design and WAT data analysis.
2. SRAM yield improvement on BEOL issue.
3., BEOL process reliability Qualification
Qualification:
1. Ph.D. in Electrical Engineering or Materials Science and Engineering... 阅读全帖 |
|
e*******n
发帖数: 174 | 21 No Chinese input here. Sorry about it.
I've got an integral that I was able to integrate with Mathematica. It does
not appear to be difficult. So I tried to solve it manually. I am not able
to figure it out. For the sake of my curiosity, I wonder if anybody could
help me out. Any hints would be greatly appreciated.
The integral has the following form:
Integrate[Cos[x]^2*Log[-a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x, 0, 2*Pi}]
where "a" is a real positive number less than 1.
Again, thanks for any hint |
|
s******1
发帖数: 969 | 22 积分分成[0,Pi]，[Pi,2Pi],
Integrate[Cos[x]^2*Log[-a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x, Pi, 2*Pi}]
= Integrate[Cos[x]^2*Log[a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x,0, Pi}]
然后：
Integrate[Cos[x]^2*Log[-a*Cos[x] +Sqrt[1-a^2*Sin[x]^2]], {x, Pi, 2*Pi}]
＝Integrate[Cos[x]^2*Log[1-a^2], {x,0, Pi}] |
|
w*****s
发帖数: 122 | 23 9月28日
Bentley的ModelServer Integrator宣布支持XML and aecXML.
Bentley合作公司今天宣布它的基于网络的ModelServer? Integrator(TM)产品支持XML and
aecXML(architecture, engineering and construction XML). ModelServer Integrator从不同的数据
库和软件应用中收集信息,然后及时迅速地吧信息在整个组织的成员面前表现出来.
ModelServer Integrator对XML的支持使得用户们可以充分利用在电子商务数据交换中已
有的各种支持工具,技术和标准. |
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e***7
发帖数: 118 | 24 本人烂校PhD，方向是signal integrity，老板是美国人，快退休了，一点都不push，
我目前在找signal integrity方向的实习或者full-time，看EE版上很少有人讨论
signal integrity的，想抛砖引玉，请各位大侠都来交流交流。
先抛砖：北美signal integrity方向最牛，出的SI方向的人最多的是哪个学校？我随便一搜，大把大把SI方向的中国人都是U Missouri Rolla 出来的。
欢迎大家讨论Stephen Hall, Eric Bogatin的书，讨论jitter, crosstalk, transmission line, VNA, TDR, HFSS, ADS...... |
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hs
发帖数: 1549 | 25 函数的问题，不赖integrate
举个例子：
> f <- function(x) sin(x)
> integrate(f, lower = 0, upper = 5, subdivisions = 100)
0.7163378 with absolute error < 3.6e-14
> f <- function(x) sin(1/x)
> integrate(f, lower = 0, upper = 5, subdivisions = 100)
Error in integrate(f, lower = 0, upper = 5, subdivisions = 100) :
maximum number of subdivisions reached
: |
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l******9
发帖数: 579 | 26 I need to solve system equations of integrals in python 3.2.
from sympy import S, Eq, solve, integrals
import sympy as sym
import scipy.integrate as integ
x, b, c, m, v, L, u = S('x, b, c, m, v, L, u'.split())
equations = [Eq(m, integ.quad(xf(x, b, c), L, u))]
def xf(x, b,c):
return x*f(x,b,c)
def f(x, b, c):
return g(x, b,c) * (x/b)**(c-1) * sym.exp(-x/b)
def g(x, b, c):
c = 1+c // TypeError: unsupported operand type(s) for +: 'int' and '
tuple'
L = 1
u = 10
... 阅读全帖 |
|
l****z
发帖数: 29846 | 27 By Elise Cooper
A basic and elementary right of every American is to be able to vote without
being intimidated and to make sure that he or she is not disenfranchised.
The Department of Justice has exclusively chosen laws it wants to uphold,
yet it looks the other way on laws that need to be enforced. Because Eric
Holder's Justice Department refuses to protect the integrity of the election
process, the states must step in and fulfill that responsibility. American
Thinker interviewed experts to... 阅读全帖 |
|
S*******i
发帖数: 2018 | 28 http://www.wsj.com/articles/german-towns-filled-with-refugees-ask-who-is-integrating-whom-1508074522
SALZGITTER, Germany—Late this summer, Nadine Langer took her six-year old
to her first day at school. The girl was one of two German children in her
class, she said, amid 20, mostly Syrian, refugees.
“I am not against foreigners,” said Ms. Langer, 41. “But there is a point
where we have to wonder who is integrating whom.”
Germany’s 2015 refugee crisis has largely disappeared from the headlines.
B... 阅读全帖 |
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t****z
发帖数: 14 | 29 对口的给我发邮件吧，CV, Resume to a******************[email protected]
这里有内部的职位refer，power systems基本都是AC,DC power supply design，相对
也有经验要求：
As a Jr. AC-DC Power Supply Design Engineer you will be driving innovative
product design and execution from concept investigation and design analysis
to successful production execution; that includes - design analysis,
modeling & simulations, schematic/BOM generation, PCB layout, DFM, prototype
developments, tests & validations, qualification, safety/REL certifications
and ... 阅读全帖 |
|
d******0
发帖数: 22800 | 30 short answer: integrated amplifier= power amp + pre-amp
long answer:
"A power amp usually just takes one signal input (or two for stereo) and
amplifies it so that it can drive a speaker.
An preamp takes several
inputs, provides a mechanism to switch between them, a volume control,
some sort of tone and balance control (usually but not always), and puts
out a single signal at line level. You plug your sources into the
preamp, plug the preamp into the power amp, and the power amp into the
speakers... 阅读全帖 |
|
j***k
发帖数: 2719 | 31 我不是大牛，只是有段时间玩HIFI比较疯，积累了一些经验。现在偶已经转战料理和甜
点制作了。最近对餐具，和BAKING的工具，食材比较发烧。
关于这个KRELL ４００，几年前我在买INTEGRATED AMP的时候到店里把几乎所有的
INTEGRATED牌子都听了一遍。开始对KRELL蛮感兴趣，因为对比KRELL其他的功放，这个
在价格上比较有优势。在NYC的PARK AVENUE AUDIO店里听的，用的是一对JOSEPH AUDIO
的书架，型号忘了，当年的价格大约是＄２K一对。用来对比的是一个ACRAM FMJ
INTEGRATED。
觉得４００的声音比较白开水，最失望的是DYNAMIC感觉比较压抑，这原本是KRELL的强
项。在细节上面，ARCAM完胜！
听后觉得这个合并机，只是挂了个KRELL的牌子，没有任何让人觉得惊喜或是心动的地
方。
同样的２手价格，考虑一下AYRE吧。。只是一个建议，同样的价格选择还是很多的。
ARCAM都不错，更加便宜。。 |
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u*****e
发帖数: 8 | 32 【 以下文字转载自 Returnee 讨论区 】
发信人: uknowme (uknowme), 信区: Returnee
标 题: Signal Integrity Engineering Manager in Singapore
发信站: BBS 未名空间站 (Tue Jul 5 01:37:23 2011, 美东)
My company, Molex Inc. (MOLX), has a signal integrity engineering manager
opening in Singapore. Requirements include but not limited to:
Master degree in EE with focus on signal integrity/high frequency
electromagnetics;
3~5 year+ experiences in gbps+ high-speed system channel design/interconnect
system (Professional experiences at IB... 阅读全帖 |
|
t****z
发帖数: 14 | 33 对口的给我发邮件吧，CV, Resume to a******************[email protected]
这里有内部的职位refer，power systems基本都是AC,DC power supply design，相对
也有经验要求：
As a Jr. AC-DC Power Supply Design Engineer you will be driving innovative
product design and execution from concept investigation and design analysis
to successful production execution; that includes - design analysis,
modeling & simulations, schematic/BOM generation, PCB layout, DFM, prototype
developments, tests & validations, qualification, safety/REL certifications
and ... 阅读全帖 |
|
m******t
发帖数: 273 | 34 【 以下文字转载自 Quant 讨论区 】
发信人: myregmit (myregmit), 信区: Quant
标 题: calculate an integral in python
发信站: BBS 未名空间站 (Fri Mar 21 09:39:52 2014, 美东)
I need to calculate an integral in python.
I have imported sympy.
g(a,z) = integral_from_z_to_inf of ( t^(a-1) * e^(-1))
in python:
x,a,z = symbols('x a z')
g = integrate(x**(a-1) * exp(-x), z, oo)
I got error:
ValueError: Invalid limits given: (z, oo)
Any help would be appreciated !
Thanks ! |
|
m**********t
发帖数: 385 | 35 Position: Integral Project Leader in Philips Research Asia
Department Description:
PRA-S focus on breakthrough innovation, aimed to generate new business for
Philips, and to support existing business. Working with industrial and
academic partners to speed up innovation and help create technologies that
really matter and get adopted.
PRA-S is an integral part of Philips' international research program and
have extensive collaborations with the Philips labs across the world. PRA-S
currently has ov... 阅读全帖 |
|
d*******3
发帖数: 6550 | 36 An integral garage is an attached garage that is built within the walls of
the main property and is an element of the building's structure. These
garages can allow admission to the house through an integral door. Integral
garages were first constructed in the late 19th and early 20th centuries in
Britain and developed in the United States in the 1920s. |
|
t***u
发帖数: 20182 | 37 http://us.blizzard.com/en-us/company/press/pressreleases.html?100505
BATTLE.NET® AND FACEBOOK INTEGRATION ANNOUNCED
Blizzard Entertainment's next-generation online gaming platform will
integrate with Facebook to enhance social gaming experience
IRVINE, Calif. – May 5, 2010 – Blizzard Entertainment, Inc. announced
today that its Battle.net® gaming service will integrate with Facebook&
reg;, linking the world's premier online gaming platform with the world's
most popular social platform. T |
|
l****u
发帖数: 2166 | 38 "A person endowed with these four qualities can be known as 'a person of
integrity.' Which four?
"There is the case where a person of integrity, when asked, doesn't reveal
another person's bad points, to say nothing of when unasked. Furthermore,
when asked, when pressed with questions, he is one who speaks of another
person's bad points not in full, not in detail, with omissions, holding back
...
"Then again, a person of integrity, when unasked, reveals another person's
good points, to say nothi |
|
o**********n
发帖数: 367 | 39 【 以下文字转载自 Working 讨论区 】
发信人: optionoption (option), 信区: Working
标 题: Look for expert to integrate Paypal web payment Pro into a (转载)
发信站: BBS 未名空间站 (Sun Aug 9 16:31:12 2009, 美东)
发信人: optionoption (option), 信区: SanFrancisco
标 题: Look for expert to integrate Paypal web payment Pro into a website
发信站: BBS 未名空间站 (Sun Aug 9 10:38:18 2009, 美东)
Dear Friend,
If you did Paypal integration before or know someone who can do it, please
drop me an email to my MITBBS mailbox.
Thanks a lot! |
|
m********y
发帖数: 1867 | 40 Integrity form这种东西白纸黑字的可小可大，尽量不要签，弄不好将来成为你的bad
record就麻烦了，影响找工作，一上升到Integrity这个层次就比较定性比较严重。
你能不能找你们学校的international students office，让他们帮你跟professor谈谈
，说明一下文化差异/语言差异等等，看能不能不上升到integrity这个层面，最多drop
掉这门课。 |
|
m****n
发帖数: 51 | 41 Integrate[f[r1] Integrate[g[r2]/Sqrt[r1+r2],{r2,0,Infinity}],{r1, 0,Infinity}]
f[0], g[0]!=0
In this integration, how can I treat the sigurity induced by 1/Sqrt[r1+r2]?
Also, how to calculate r1*r2/Sqrt[r1^2+r2^2] when both r1 and r2 approach to
0? |
|
j***u
发帖数: 26 | 42 I designed an integrator, it is actually a low pass filter, a simple one
stage differential amplifier with one terminal input short to the output and
connected to a capacitor. In this case, the input is a signal, the output
would be the input average voltage. All the transistors work in the weak
inversion. The integrator has a tail current of 100pA. The transistor were
sized to have a DC offset of 5mV, that means the output is 5mV apart from
the input DC level. However, when I tested this integr |
|
l*******e
发帖数: 262 | 43 【 以下文字转载自 JobHunting 讨论区 】
发信人: lazyhorse (lazyhorse), 信区: JobHunting
标 题: Power Systems - Verification/Integration Engineer (all levels) at Qualcomm
发信站: BBS 未名空间站 (Fri Jul 13 14:45:25 2012, 美东)
Please check here for more details and resume online submission. https://
jobs.qualcomm.com/public/jobDetails.xhtml?requisitionId=1896212&page=
jobSearch, you can email me your name through mitbbs email or message once
you submit your resume.
Job Function Qualcomm CDMA Technologies, a.k.a. QCT ... 阅读全帖 |
|
l*******e
发帖数: 262 | 44 【 以下文字转载自 JobHunting 讨论区 】
发信人: lazyhorse (lazyhorse), 信区: JobHunting
标 题: Power Systems - Verification/Integration Engineer (all levels) at Qualcomm
发信站: BBS 未名空间站 (Fri Jul 13 14:45:25 2012, 美东)
Please check here for more details and resume online submission. https://
jobs.qualcomm.com/public/jobDetails.xhtml?requisitionId=1896212&page=
jobSearch, you can email me your name through mitbbs email or message once
you submit your resume.
Job Function Qualcomm CDMA Technologies, a.k.a. QCT ... 阅读全帖 |
|
n**h
发帖数: 22 | 45 对，tau是常数。
那f要满足什么条件才叫不变态呢？如果是continuous是不是就足够了？
在网上搜了很多stochastic integration，发现都是integrator是random process，是
一个deterministic function的例子反倒一个都没有，应该像你说的是因为这种情况太
简单根本不属于stochastic integration。但是有什么theorem可以直接用吗？如果要
严格的证明好像还不知道如何下手。。。 |
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m******t
发帖数: 273 | 46 【 以下文字转载自 Quant 讨论区 】
发信人: myregmit (myregmit), 信区: Quant
标 题: calculate an integral in python
发信站: BBS 未名空间站 (Fri Mar 21 09:39:52 2014, 美东)
I need to calculate an integral in python.
I have imported sympy.
g(a,z) = integral_from_z_to_inf of ( t^(a-1) * e^(-1))
in python:
x,a,z = symbols('x a z')
g = integrate(x**(a-1) * exp(-x), z, oo)
I got error:
ValueError: Invalid limits given: (z, oo)
Any help would be appreciated !
Thanks ! |
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