H***F
发帖数: 2501 | 1 1, create symbol .sym file for mos
2, creat model .sub file
3, in the schematic, place the symbol and use .inc command to include the .
sub file
4, done
一下是spice model，网上找了很多导入BJT Diode的，就是没找到cmos的，求大大们赐教
.MODEL MN NMOS
LEVEL=2
VTO=0.3V
LD=0.04U
UO=210
TOX=4E-09
+CGSO=230P CGDO=230P TPG=1 NSUB=3.7E17 MJ=0.4 CJ=1030U
+CJSW=130P MJSW=0.3 XJ=0.1U GAMMA=0.4 PHI=0.6 LAMBDA=0.2 |
|
a****h
发帖数: 3780 | 2 【 以下文字转载自 Mathematics 讨论区 】
发信人: aumath (数学), 信区: Mathematics
标 题: matlab求教:怎样定义n个symbolic变量呀？
发信站: BBS 未名空间站 (Mon Jul 18 18:36:56 2005), 转信
我用这个命令好像不行：
for i=1:n
syms xi
end
matlab把i看成字母了，这样好像就定义了一个symbolic变量xi
哪位大侠能帮忙说一下该怎么定义，非常感谢！！ |
|
l********r
发帖数: 14 | 3 【 以下文字转载自 Programming 讨论区 】
【 原文由 littledear 所发表 】
偶的具体问题是这样的。
偶有一个sym object, such as:
y=3*x^2+5*x^7
想把系数和阶次取出放到数组里面。
偶能想到的办法是用字符串比较，找'x','*','^'等关键字，然后取出相应的
字符串，然后转换成数。这在c里面应该不难，不知道matlab是否方便？
有更好的办法实现这个吗？ |
|
a****h
发帖数: 3780 | 4 我用这个命令好像不行：
for i=1:n
syms xi
end
matlab把i看成字母了，这样好像就定义了一个symbolic变量xi
哪位大侠能帮忙说一下该怎么定义，非常感谢！！ |
|
w*******a
发帖数: 27 | 5 symbolic math toolbox
有积分，help里应该有。其实内核就是maple.
Ex：
syms x,a;
f = exp(-a*x^2);
int(f,x,-inf,inf)
This returns
ans =
1/(a)^(1/2)*pi^(1/2)
数值积分的话就quad吧。 |
|
|
j*****n
发帖数: 8 | 7 syms a b c d Z;
solve('Z^3+(c+b+a)*Z^2+(a*c+a*b+b*c)*Z-d+a*b*c=0','Z'); |
|
w****1
发帖数: 4931 | 8 Anyone who claims this don't really understand physics.
Let me give you some examples. Mathematicians are often interested in very
general properties of theories, and global aspects (i.e. topology).
Physicists (by which I mean string theorists :) ) are more interested in the
dynamics. Many things physicists are interested in are uninteresting to
mathematicians. For instance, the cusp anomalous dimension of N=4 SYM, which
is extremely interesting to string theorists, would hardly draw any
interes |
|
s******e
发帖数: 841 | 9 【 以下文字转载自 EE 讨论区 】
发信人: shawjone (保持一个良好的心态), 信区: EE
标 题: 问一个Matlab的问题
发信站: BBS 未名空间站 (Fri Oct 24 20:23:02 2008), 转信
六个变量五个方程，我想把b, a1, a2, b1, b2都用a表示，
syms a b a1 a2 b1 b2;
[b,a1,a2,b1,b2]=solve('a1*125+b1=a*125+b*1.1','a2*80+b2=a*80+b*1.1', ...
'a1*100+b1*1.1=a2*100+b2*1.1', ...
'(a1*156.25+b1*1.1)*2/3+(a1*100+b1*1.1)/3=(a1*125+b1)*1.1', ...
'(a2*100+b2*1.1)*2/3+(a2*64+b2*1.1)/3=(a2*80+b2)*1.1');
这个代码得到的结果并没有给出每个变量都用a表示的结果，而是比如b1表示成了a,a1
和b的组合，请问我怎么样才能解决这个问题
谢谢 |
|
w****1
发帖数: 4931 | 10 It is not different. Mirror symmetry is a statement about 1+1 dimensional
superconformal field theories. The geometric version has to do with SCFTs
arising from sigma models on Calabi-Yau manifolds. The Calabi-Yau manifold
in the GL context is the Hitchin moduli space, which is hyperkahler and is a
special case of the more general story. N=4 SYM motivates this story but is
not a necessarily ingredient.
of
and
blabla
different. |
|
r**a
发帖数: 536 | 11 可能我没有表达清楚。我和你的侧重点不同。正如你所说Mirror in GL就是借用了最一
开始Mirror symmetry 在SCFT中的意思。但是"normal” mirror symmetry有很多方面
侧重于spacetime的意义，而不是worldsheet上面的。"normal” mirror symmetry对于
理解弦论如何能得到低能物理起着很重要的作用。他解释了typeIIA and typeII B之间
的关系。这也就是为啥向gromov-witten, donaldson-thomas, gupakumar-vafa都能联
系在一起的原因。我的意思是说从spacetime的这个角度来看，normal mirror 和
mirror in GL是很不一样的。我个人感觉，如果说某个人是做mirror symmetry的话，
似乎意味着此人的工作应着重于gromov-witten, donaldson-thomas, gupakumar-vafa
等等，而不是说GL or N=4 SYM。至少这句话在物理圈子里面适用。
你的话更强调的是从worldsheet角度理解。另 |
|
h**********c
发帖数: 4120 | 12 用matlab跑了一下,不行!
A x = b, A 的RANK 好象只有12.
脚本如下,谁知道什么好PACKAGE,或者MATLAB怎么改一下?
syms x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 x16 x17 x18 x19
eq1 = 'x1 + x2 + x3 = 38';
eq2 = 'x4 + x5 + x6 + x7 = 38';
eq3 = 'x8 + x9 + x10 + x11 + x12 = 38';
eq4 = 'x13 + x14 + x15 + x16 = 38';
eq5 = 'x17 + x18 + x19 = 38';
eq6 = 'x1 + x4 + x8 = 38';
eq7 = 'x2 + x5 + x9 + x13 = 38';
eq8 = 'x3 + x6 + x10 + x14 + x17 = 38';
eq9 = 'x7 + x11 |
|
h**********c
发帖数: 4120 | 13 最新进展 June 2
根据昨天的echelon form,我们得到A的COLUMN VECTORs的线性相关性
Run matlab commands,
syms x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 x16 x17 x18 x19
eq1 = 'x1 + x2 + x3 = 38';
eq2 = 'x4 + x5 + x6 + x7 = 38';
eq3 = 'x8 + x9 + x10 + x11 + x12 = 38';
eq4 = 'x13 + x14 + x15 + x16 = 38';
eq5 = 'x17 + x18 + x19 = 38';
eq6 = 'x1 + x4 + x8 = 38';
eq7 = 'x2 + x5 + x9 + x13 = 38';
eq8 = 'x3 + x6 + x10 + x14 + x17 = 38';
eq9 = 'x7 + x11 + x15 + x18 = 38';
eq10 = 'x12 + x16 + x19 = 38';
eq11 = 'x8 + x13 + |
|
n***e
发帖数: 651 | 14 syms t;
x=1;
c1=int(cos(pi/2*t^2), 0,x)
结果总是返回 FresnelC(1)
怎么得到这个返回的数值？
thanks |
|
z**********4
发帖数: 467 | 15 Hi everyone, I have great post step 3 syndrome. It has been almost 5 days.
The symptoms are lethargic, fatigue and social withdrawal.I was just
indulged in movies and lack interest in anything else. But prior or during
exam, I was very energetic. I did 40 min physical workup everyday. But I did
not exercise at all post exams. I try to cheer myself up but in vain. I
think that I must strain too much. I got all exam done in 20 mos with 258
and 250 in both step 1 and ck. Any help to address the sym |
|
s********p
发帖数: 1319 | 16 补充三点：
第一：一旦急性心包炎的脏层和壁层分离，心包摩擦音就消失——留给听到心包摩擦音
的时间窗口并不长。
第二：坐位或前倾位缓解胸痛的理由：A，这个体位大大缓解了壁层心包的张力；B，我
认为也大大缓解了神经比如内脏神经等的张力（牵拉）。
第三：我个人认为：急性心包炎的胸痛症状和体征（心包摩擦音）在某种的程度上是分
离的。
Attached the description of the chest pain from the 6th edition of Heart
Disease, Text book, please check.
ACUTE PERICARDITIS
SYMPTOMS.
The onset may be abrupt or insidious. Bacterial and viral pericarditis often
strike dramatically, whereas the uremic or tuberculous pericarditis often
goes unnoticed. Diagnosis can be suggested by sym |
|
r*****1
发帖数: 805 | 17 还有部分Abx总结，以前有经验贴分享USMLEforum的经典贴。但自己总结的东西容易记
住。希望给大家一点帮助。
P.S.: 顺着iamreallybad&斑竹思路，旁注中文为mnemonics.
Menigitis: G- use Ceftriaxone; bacilli use Gentamycin; DXM- in S. pneumonia
& unknown microb infection
G+ cocci: Vancomycin+Ceftriaxon
G+ bacilli (Listeria): Ampicillin + Gentamycin +
dexamethasone
G- cocci: Ceftriaxon
G- bacilli: Ceftriaxon+ Gentamycin
Fungus: Amphotericin+ Flucytosin IV-> Flucona... 阅读全帖 |
|
z******8
发帖数: 844 | 18 ☆─────────────────────────────────────☆
rhcrc11 (Rebel) 于 (Thu May 15 00:13:42 2014, 美东) 提到:
Step3考场壮烈回来。第一天挺累人，最后一个block甚至做到有心无力状，看着题反应
不过来，导致来不及做完。非常没有信心能否通过。所以match之前先考Step3的童鞋，
需要考前调整生物钟，坚持锻炼，提高耐力。
MCQ没有资格说，CCS有一点小感受，拿出来分享下。大家请轻拍砖。
复习资料：
UW 52 online cases : 基础。最好复习早起找高手一起过一遍，尽快摸熟软件，进入
状态。第二遍找一位水平相近童鞋过一遍，不断总结protocol. 考前迅速做一遍，熟练
运用protocol.
UW 41 offline cases: 我当时和partner每个case仔细做一遍，虽然不像online有反馈
，但对练临床思维，补充protocol非常有帮助。最后考试与41 case有异曲同工之处，
遇到复杂case也不慌神。
CD 6 cases： 最后再熟悉下考试软件。与UW相近，但... 阅读全帖 |
|
w****1
发帖数: 4931 | 19 there are common features shared by strongly coupled CFTs, supersymmetric or
not. For instance, N=4 SYM vs QCD. It is not clear what are all the lessons
one can learn from the maximally supersymmetric models, but there are
definitely something to make out it, even if one is ultimately interested in
the purely bosonic theory.
sachdev
=8 |
|
w****1
发帖数: 4931 | 20 By the way, N=8 SYM is only a UV description, which can be deceiving. The IR
dynamics may look very different. For instance, now we believe that the IR
CFT is described by a strongly coupled Chern-Simons-matter theory at CS
level k=1, which has no propagating gauge field. Of course, the
superconformal algebra is there and governs the spectrum and correlation
functions of certain operators in the CFT, so that tells you it's different
from the bosonic theory.
sachdev
=8 |
|
w****1
发帖数: 4931 | 21 Dude, if you tell me that AdS/CFT is the only active field in string theory,
then I could say that there is no active field in condensed matter theory.:)
Let me give one simple example of something we know from AdS/CFT about the
field theory, that is almost certainly true, but has not been possible to
derive directly using field theory techniques: the free energy of N=4 SYM at
finite temperature in the strong 't Hooft coupling limit. Note that the
cusp anomalous dimension at strong coupling has |
|
w****1
发帖数: 4931 | 22 Well it's not much harder than any other strongly coupled theories -- it's
probably a bit more complicated than N=4 SYM, even if it turns out to be
integrable.
but
time
approximately. |
|
w****1
发帖数: 4931 | 23 Well that depends. RG is also a form of extrapolation, and it often does not
work very well, e.g. going from N=8 SYM in 3d to M2-branes. In ABJM, there
is potentially integrability, which may help.
The only parameter for the world volume theory of N M2-branes in flat space
is, well, N. And we already know the weakly coupled description in the large
N limit -- 11d supergravity on AdS4xS7. It is almost impossible to have two
equivalent "dual" descriptions both at weak coupling at the same time,
be |
|
c****e
发帖数: 2097 | 24 right, either of those could have a go. but if the N=4 SYM had a string
dual, maybe the N=8 supergravity would regain string theory status
somehow too.
so yeah, the signature of string theory is such that it does not complete
gravity in the UV by making it a renormalizable model in the usual
and 4d sense. it's actually pretty 'nasty' due to all these extra stuff.
potentially |
|
s*n
发帖数: 245 | 25 Thanks. But some error.
m = {{1, 2}, {3, 4}};
Table[Save[ToString[i] <> ".dat", m[[i]]], {i, 1, Length[m]}]
Save::sym: "Argument m[[i]] at position 2 is expected to be a symbol." |
|
c*******6
发帖数: 24 | 26 set Z=X+Y, then E[X|X+Y=1]=E[Z-Y|Z=1]=E[1-Y]=0.5
or
due to sym E[X|X+Y=1]=E[Y|X+Y=1], then 1=E[X+Y|X+Y=1]=E[X|X+Y=1]+E[Y|X+Y=1]=
2E[X|X+Y=1] -> E[X|X+Y=1]=0.5 |
|
r****y
发帖数: 1437 | 27
Because you redefine them as symbolic variables.
Solution
function z=test1(x1, y1)
syms x y z1;
z1=int((2/3*abs(-y*(6-12*x)-y*(-2+6*x))^2,y);
x=x1; y=y1;
z=eval(z1);
|
|
C***r
发帖数: 759 | 28 【 以下文字转载自 Thoughts 讨论区,原文如下 】
发信人: Camer (铁划银钩), 信区: Thoughts
标 题: Albert Einstein on: Religion and Science
发信站: The unknown SPACE (Sun Jul 16 11:35:56 2000) WWW-POST
Albert Einstein on:
Religion and Science
In this file:
Religion and Science, New York Times Magazine,
November 9, 1930
Science and Religion I, Address: Princeton
Theological Seminary, May 19, 1939
Science and Religion II, Science, Philosophy and
Religion, A Sym |
|
D******n
发帖数: 2836 | 29 check out symbolic
in ur case,
syms x y;
b=[1 x;3 y] |
|
T****n
发帖数: 2195 | 30 我觉得用列向量比较好，A= [a1;a2;a3....], 然后预先定义列，比如第一，三列是常
数，二四列定义个变量。
当然SYMS也可以。 |
|
m*********k
发帖数: 10521 | 31 [paladin] OldMonk Nov 26 ● 感恩节包子 前50个有效
10*50=500
成功奖励 10 伪币的用户: asnow, beka, bluefairy, bwi, capriccio, cef, chleen, codycody, Diadora, diamondking, dylandong, fanzhuce, fireballuser, goaway, hlhvln6, hock, ILoveNews, ISO9001, jaff1973, jinghai1979, johnwj, kissingfire, laoliang, luxilon, maodaren, mingfm, mir, mrp, OldMonk, oyeyy7, parfume, qmqnsh1, quakeiii, rapala, RL, s3, scoajov175, sglz, starysky, statman, supercnm, syms, szxp, that, TINS, treeline, trump, umwfop977, univers |
|
f**o
发帖数: 12685 | 32 1）个人申请：手续费10%；
2）若统计复杂，需提供名单，一行一ID，无空格无标点；
zhizunbao123
magicfinger2
Targaryen
ForYouForMe
yindua3
Bifujian
MZeins
teiyua
souffle71
omo
lijie201005
redalert19
AmFarmer
fzjpx
futures1
take5
TofE
qiatdc
aple
hourwork
merfeel
lagrangelp
SetTimer
syms
beijingren
nonono
cards
lq558
goodveal
Mitobbs
xxm0822
umutata
AFADFF
dxnju
Reek
renren123
bbdou
zhunbeizhe
LoveinGod
tend
bridge24
mbp
archet
mjyu
tankPhD
xinchong
rbs
action119
futurist
wyp9136608
3）同一ID多项奖励，请合计最终金额。
代发版面/ID:fwdo
代发事由(主题标题及链接，如有链接必须附... 阅读全帖 |
|
m*********k
发帖数: 10521 | 33 "[Military]
fwdo Oct 5 ● 【已结束】一人一个包子夸屠呦呦和毛主席，发50个！"
成功奖励 10 伪币的用户: zhizunbao123, magicfinger2, Targaryen, ForYouForMe,
yindua3, Bifujian, MZeins, teiyua, souffle71, omo, lijie201005, redalert19,
AmFarmer, fzjpx, futures1, take5, TofE, qiatdc, aple, hourwork, merfeel,
lagrangelp, SetTimer, syms, beijingren, nonono, cards, lq558, goodveal,
Mitobbs, xxm0822, umutata, AFADFF, dxnju, Reek, renren123, bbdou, zhunbeizhe
, LoveinGod, tend, bridge24, mbp, archet, mjyu, tankPhD, xinchong, rbs,
a... 阅读全帖 |
|
V*****G
发帖数: 337 | 34 Thanks for your cases, always can learn more!!!
For that case of food poisoning, I doubt it is staphy aureus, because the
main part of presentation is vertigo. The only thing I find close to that
presentation is Botulism. (I didn't reply at that time is because I cannot
surf often), I really think answer should be Clostridium Botulinum
http://www.livestrong.com/article/111800-botulism-poisoning-sym
Vision Changes
Patients who develop botulism poisoning typically experience vision changes
within ... 阅读全帖 |
|
V*****G
发帖数: 337 | 35 Thanks for your cases, always can learn more!!!
For that case of food poisoning, I doubt it is staphy aureus, because the
main part of presentation is vertigo. The only thing I find close to that
presentation is Botulism. (I didn't reply at that time is because I cannot
surf often), I really think answer should be Clostridium Botulinum
http://www.livestrong.com/article/111800-botulism-poisoning-sym
Vision Changes
Patients who develop botulism poisoning typically experience vision changes
within ... 阅读全帖 |
|
a****t
发帖数: 720 | 36 来自主题: WeddingBells版 - 奔个小钻 .92, h, ex cut, vs2, vg sym, vg polish |
|
|
x*****u
发帖数: 3419 | 38 ft ")
回车就是Sym右边的那个键。
比如用windows下notepad,点save as，出来的窗口中有一个encoding的选项，点击选择
utf8。 |
|
x*****u
发帖数: 3419 | 39 【 以下文字转载自 PDA 讨论区 】
发信人: Tsar (wahaha), 信区: PDA
标 题: Re: Kindle的FAQ！不定时更新
发信站: BBS 未名空间站 (Sat Dec 4 01:34:28 2010, 美东)
再来一个
http://blog.tianya.cn/blogger/post_show.asp?idWriter=0&Key=0&BlogID=75241&PostID=22681707
总结一下Kindle DX的一些使用方法及技巧：
一、文件支持和转换
1、文档支持：Kindle支持的文件格式包括Kindle (.AZW, .AZW1)，Text (.TXT)，
PDF (.PDF)，Unprotected Mobipocket (.MOBI, .PRC)，Audible (.AA, .AAX)，MP3 (
.MP3)。
2、文档转换：
另外，用户可以转换以下类型的文件，转换后导入Kindle即可显示，这些文件类型
包括：Microsoft Word (.DOC, .DOCX)，Structured HTML (.HTML, .HTM)，TX... 阅读全帖 |
|
|
|
