d*******a
发帖数: 518 | 1 First, plots are very important in diagnosis and model specification.
Plots can identify problems that no diagnostic tests can do in some cases.
在做所有统计分析前，先看data，plot经常比analysis更重要
所以如果是我，在做 ANOVA 之前，先看看一些plot，看看一些基本的assumption 是否
明显背 violated。
第二，仍然是做analysis 之前，仔细考虑一下 experimental design 是很重要的，it
may help identify some random effects, and improve your statistical model.
A two sample t-test is an easy thing to do, but not necessarily the right
one.
e.g. sometimes a paired-t-test is more reasona |
|
l**********1
发帖数: 5204 | 2 Continue:
第四乐章 Finale
找有关的PhD dissertation 里边的 R source code program
while U can debug it or even rewrite it for another task,
then you already masted NGS coding skills.
比如
http://www.dspace.cam.ac.uk/handle/1810/218542
DSpace at Cambridge
title: Genome-wide analyses using bead-based microarrays
Authors: Dunning, Mark J
Issue Date: 4-Sep-2008
Files in This Item:
File Description Size Format
dunning_thesis_.pdf 10.47 MB Adobe PDF
its Appendix B
R source Code f... 阅读全帖 |
|
s***t
发帖数: 195 | 3 matlab by default use different colors for different lines if you
plot them in one plot function.
if you want to use your own colors, you can define a color matrix (Nx3)
in rgb colors. each time take a row from that matrix and plot using that
color by plot(x, y, 'Color', colors(ii,:)).
you can also get the default line colors used by matlab by
colors = colormap('Lines') |
|
d******n
发帖数: 509 | 4 Thanks!
But plotyy will give me a two y-axis plot. it means I need to write
something extra in the figure legend correspondingly. Since all of my other
plots only have one axis, I still prefer to present everything in the same
plot.
Someone mentioned that I could try SigmaPlot. I have never used that, but
will see if it is easy to plot it in the same format as others.
Thanks again! |
|
s***e
发帖数: 1490 | 5 用plot画图，16条曲线没有问题，17条，就出了 Error using plot - too many input
parameters. 是不是plot最多允许plot 16条线？怎么解决这个问题？
谢谢 |
|
r****y
发帖数: 1437 | 6 It sounds impossible, I am usually plots >100 curves on one plot
during exploration phase of some data analysis.
I think you might do
plot(x1, y1, x2, y2, ..., x16, y16) and it breaks matlab?
If so, try just
plot(x, [y1;y2;y3;...])
make y an matrix, interpolate them to common x
input |
|
i**g
发帖数: 134 | 7 h0=plot(x,y,'b-*','visible','off');
hold on;
h1=plot(x,y,'b-');
h2=plot(x(1:20:end),y(1:20:end),'*');
h3=plot(xother,yother,'r-');
legend([h0,h3]); |
|
b********2
发帖数: 5 | 8 我现在对如下的时滞微分方程组写了个小code:
y1'=-a*y1^2-pai*S*(c-y1-y2）+k*y2*y2(t-\tau);
y2'=ip*y2*(c-y1-y2)-k*y2*y2(t-\tau)
(这里\tau是时滞。 y1,y2是变量， a， pai， k， c, ip是参数。
\tau=2, t in [0, 5].)
这个程序运行起来没有问题，但是我不知道我的code是不是正确的描述了这个方程组。
1。 特别是我的ylag1(2）的表达
2。 还有在figure(2) 和figure（4）中，我想分别画 时间t与 y1, y1与y2的图形，
不知
道我的code的表达对不对？ 我用了 sol.y(1,:), sol.y(2,:).这样写是正确的吗？
谢了
。
function v=manuf(t, Z, y)
v=zeros(2, 1);
a=2; pai=3; c=20; k=3; ip=2;
ylag1=Z(:,1);
v(1)=-a*y(1)*y(1)-pai*y(1)*(c-y(1)-y(2))+k*y(2)*ylag1(2);
v(2)=ip*... 阅读全帖 |
|
v***o
发帖数: 51 | 9 我maple用的多。好多学校都免费下载的。要入门，按help-Manual,Dictionary and
More...-Plotting Guide(v12)。那里有好多样图，你可以指哪打哪。基本一点不用学
coding。maple有很好的GUI帮助你画图的。参看以上Plotting
Guide里的Interactive Plotting。
画game tree,参看以上guide里的Draw Graph and Network或help里search Graph(
theory)。还有就是结合Drawing Tools(help 里search)，比如要加注释或画
information set。这个类似word的draw。
不过我还是建议你学点CODING和软件制图背后的一些原理。可以看这里的第5和6章：http://ems.calumet.purdue.edu/mcss/kraftrl/mfmm/ 。 特别是第6章,比如Adaptive Plotting Algorithm。我碰到不少实际问题，还是要花时间捉摸一下背后的计算和视觉效果问题，比如最近就碰到search/match |
|
f*****g
发帖数: 30 | 10 例子：
% plot (x,y1) and (x,y2) on the same graph
plot(x,y1);
axes; % generate a new axes system on the same figure
set(gca,'color','none');
% remove the default white background, so the first plot will be seen.
set(gca,'yaxis','right');
% move the y axis to the right side.
plot(x,y2);
接下来的修饰，应该都差不多了。 |
|
l*******G
发帖数: 1191 | 11 Assume it is y=f(x) curve.
in matlab,
help imread
will tell you how to read a image
help imshow
will tell you how to show the image on your screen
help hold
will tell you how to plot one figure on top of another
help plot
you can use it to plot a frame that just covers the image with
or you can plot 4 dots that overlap with the 4 corners of the image
appropriate
x and y axises
help ginput
will tell you how to read position from the figure |
|
a****l
发帖数: 8211 | 12 I wrote this Matlab script to examine the effect mentioned in previous posts:
x=[1:pi/100:pi*100];
y=sin(2*pi*200*x);
hold on;
fy=log(abs(fft(y)));
plot(fy,'b')
fy=log(abs(fft(y.*y)));
plot(fy,'.k')
fy=log(abs(fft(abs(y))));
plot(fy,'r')
I believe this plot explains the difference pretty well. Very interesting.
Nshaper |
|
a****l
发帖数: 8211 | 13 I wrote this Matlab script to examine the effect mentioned in previous posts:
x=[1:pi/100:pi*100];
y=sin(2*pi*200*x);
hold on;
fy=log(abs(fft(y)));
plot(fy,'b')
fy=log(abs(fft(y.*y)));
plot(fy,'.k')
fy=log(abs(fft(abs(y))));
plot(fy,'r')
I believe this plot explains the difference pretty well. Very interesting.
Nshaper |
|
w*******x
发帖数: 489 | 14 这个已经指定格式了，应该生成数据的软件自己可以话的吧。
简单的可以linux脚本提取前面设置信息，调用gnuplot画图。gnuplot应该是默认装好
了的。
gnuplot画图大概是这样：
plot data.dat using 1:2:3 w yerr
大概你可以写一个如下脚本：save 成plot.sh, 调用bash plot.sh youdata.dat 就可
以了
tail -15 $1 >draw.dat #选出某位的数据行，比如有15行
gnuplot -persist <
plot draw.dat using 1:2:3 w yerr ls 1
EOF
|
|
a****o
发帖数: 42 | 15 who don't you try this:
x=linspace(0,1);
y=x.^2;
figure(1);
plot(x,y);
figure(2);
plot(x,y,'d-');
figure(3);
plot(x,y,'s');
after this, it might be a good idea to type:
help plot
Hope this is what you want |
|
t*****9
发帖数: 19 | 16 Hi,for example, use this:
x = seq(-pi,pi,.001);
plot(x,sin(x),xlim=c(-pi,pi));
par(new=T)
plot(y,cos(y),xlim=c(-pi,pi));
par(new=T)
plot(....)
will overlap, be careful of the x=axis, can use xaxis = F in plot argument,
etc.
Hope this will help. |
|
h*****o
发帖数: 240 | 17 谢谢各位
请给看看如下程序哪里有错？
为何不出线图？
data ar1;
u1=0.95;
u2=0.75;
u3=0.2;
u4=-0.9;
n = 15;
do h=0 to n by 1;
ph1 = u1^h;
ph2 = u2^h;
ph3 = u3^h;
ph4 = u4^h;
end;
run;
SYMBOL1 V=star C=red I=JOIN width= 1;
proc gplot data = ar1;
plot ph1*h;
plot ph2*h;
plot ph3*h;
plot ph4*h;
run; |
|
d*******1
发帖数: 854 | 18 有一个dataframe, 很多column, 想对任意一对column做scatter plot.
比如 plot(data$columnXXXXX, data$columnYYYYY)
但是每次命名column太麻烦了， 就想到用下面这个办法
plot(names(data)[2], names(data)[3]), 但是不work
又变成plot(data$names(data)[2],data$names(data)[3]). 还是不work,
有没有大侠给提个思路？ |
|
d*******1
发帖数: 854 | 19 以前都是用lm(y~x), plot(y,x), abline(fm, col=4)
regression line 就自动加到scatter plot里了，
如下：
fm<- lm(y~x, data)
attach(data)
plot(y~x)
abline(fm, col=4)
但是现在只产生了SCATTER PLOT, ABLINE 加不上去。好象什么被turn off了， 请帮助
谢谢 |
|
w******a
发帖数: 25 | 20 Here is an R example to impute one or two missing data in each record:
The data will look like
col1 col2 col3
x
x x x
x x
x x
x x x
x
x x x
...
library(Rlab)
alp = 1
K_delta = 2
len_Y1 = 200
#Sample setting:
#Measurment N_
patient Percent
# 1 12
0.18
# 1 2 4
0.05... 阅读全帖 |
|
T*******I
发帖数: 5138 | 21 我准备接受goldmember的挑战公布Code。
SAS Code (Part I): Simulation for a Dichotomic Regression wirh Julious's Sample
我要公布的code仅仅是一个关于dichotomic regression simulation的SAS code。是我在4年多前写的。仅仅作了一点小小的更改。我的code写得很笨拙，但it runs good。请大家保存好你的500个随机样本。以备后用。
我将分段公布，这里是第一部分，data generation and random check.
这个例子是想要告诉大家，如果你的分析逻辑正确，根本不需要simulation。
正如我对goldmember说过，在接受这个挑战前，让我问大家几个问题：
如果总体中存在一个临界点，你认为样本临界模型一定在临界点处连续吗？如果你的回答是肯定的，你的哲学的或/和数学和/或统计学的逻辑基础是什么？然后再问问你自己，总体给了你连续性的保证吗？你可以在样本基础上假设总体的连续性吗？为什么？
大家回答了我的这几个问题后我再公布后面的正式算法... 阅读全帖 |
|
S********a
发帖数: 359 | 22 请教个sample size calculation for logistic reg的问题，predictor是PM(25%的人
是在exposure下，trial的个数我自己写了个1000）, outcome 是MI(4个人里有一个人
是MI，所以P＝0.25,trial的个数也是自己写的1000),我想看sample size 要多少才可
以significantly odd ratio>1.
proc power;
logistic
vardist("pm")=binomial(0.25, 1000)
vardist("MI")=binomial(0.25, 1000)
testpredictor="MI"
responseprob=0.25
testoddsratio=1
alpha=0.05
power=0.8
ntotal=.;
plot y=power min=0.01 max=0.99 yopts=(ref=0.8 crossref=yes) vary(symbol);
run;
结... 阅读全帖 |
|
A*******s
发帖数: 3942 | 23 case by case.
for your case generally i would say,
1. check Y's properties. is it bounded/truncated?
2. fit a linear model as benchmark
3. then u can talk one day about how to analyze residual plots
4. continue to talk one more day about how to analyze residual plots
5. continue to talk one more day about how to analyze residual plots
6. continue to talk one more day about how to analyze residual plots
7 .... |
|
w*******e
发帖数: 666 | 24 在SAS的官网上找到个链接，有画forest plot的code。
想请教：
如果sohn 2002 snow 1999 和raine2003 下还分别有A B C 三个race，该怎么修改上面
的code呢？
我试了半天，连input data都一直报错。
或者哪位在哪里看到相似的例子，能否发我一份呢？
非常感谢！
得出的图如下：
http://support.sas.com/kb/35/773.html
code 如下：
/* Set the graphics environment */
goptions reset=all cback=white border htitle=12pt htext=10pt;
... 阅读全帖 |
|
S******y
发帖数: 1123 | 25 I have finally got Hadoop working on my Linux box. Next I would like to try
to see if I could to parallel model estimation for some commonly used models
such as logistic regression.
My question now is - how to paralell gradient descent for logistic model
estimation for real large data set?
Any thoughts would be greatly appreciated. Thanks in advance!
PS. See R code below. If needed, I could rewrite the following code in Java
or Python. But the question is how to decompose the following estimatio... 阅读全帖 |
|
h******n
发帖数: 190 | 26 Okay, I think the question is about how do you treat a continues variable in
your model ?
First of all, you need plot to see the distribution of this variable, and
another plot to see its relationship with outcome - with this plot, you may
want to try use logit(Y) as Y-axis in addition to a binary Y.
Then, based on your plots, you may decide the way you want to use it - you
can use it as lienar, as with this way, it might be better to be
centered, or be devided by a unit such as 10 or 100 or 100... 阅读全帖 |
|
a**j
发帖数: 60 | 27
Using R:
#dendogram for unsplitted efron2004 data set
install.packages("care")
library("care")
install.packages("rpart")
library("rpart")
install.packages("partykit")
library("partykit")
data(efron2004)
attach(efron2004)
efron2004
efron2004_rpart<-rpart(y~x[,1]+x[,2]+x[,3]+x[,4]+x[,5]+x[,6]+x[,7]+x[,8]+x[,
9]+x[,10], data=efron2004, control=rpart.control(numsplit=10))
plot(as.party(efron2004_rpart),main = "Dendogram of Y~ Xis for Efron data
sets", font.main = 4)
#dendograms for splitted efron20... 阅读全帖 |
|
R******d
发帖数: 1436 | 28 来自主题: Statistics版 - PCA作图 用SAS把PC算出来了，想作漂亮一点的图片，plot做出来的太丑了，还隐藏了很多点不
出来。
proc plot data=out;
plot prin1*prin2 $id="*";
run;quit;
别人的图片都挺漂亮，有的有3个pc做的立体图相当好看。
请问，能用SAS做出漂亮的PC plot图吗，如果SAS不行，哪个工具可以？（数据已经产
生了，光作图就行）
谢谢。 |
|
s**********t
发帖数: 1846 | 29 我的悲伤只有上帝知道：
Restraining order application: Case # GQ008930
Additional Declaration
After the initial application was filed, there were continuous wiretapping
and stalking activities by Mr. Ernest Hiroshige.
I believed Mr. Hiroshige approach to my my new tenant Frnk Castellanos, who
was reply a rental ad I post on the crag list on Sept 2nd 2012. Mr. Frank
Castellanos is a new tenant who had apply the plaintiff’s rental ad from
the crag list. And had him pass on threatening message to me on Sept 6t... 阅读全帖 |
|
y***u
发帖数: 7039 | 30 锡安protocols 的关于共济会的:
SECRET SOCIETIES
4. Meantime, however, until we come into our kingdom, we shall act in the
contrary way: we shall create and multiply free masonic lodges in all the
countries of the world, absorb into them all who may become or who are
prominent in public activity, for these lodges we shall find our principal
intelligence office and means of influence. All these lodges we shall bring
under one central administration, known to us alone and to all others
absolutely unknown, wh... 阅读全帖 |
|
w*********g
发帖数: 30882 | 31 Chinese Smuggler Tried to Sneak Carbon Fiber for Fighter Jets, Feds Claim
By Robert BeckhusenEmail AuthorSeptember 28, 2012 | 6:30 am | Categories:
Spies, Secrecy and Surveillance
Exporting aerospace-grade carbon fiber isn’t easy, as it can be used to
build military planes like the F-22 Raptor. Photo: Air Force
The U.S. has busted up a plot to smuggle tons of carbon fiber to China,
where the material would ostensibly be used in the construction of new
fighter planes. That might seem worrying, bu... 阅读全帖 |
|
y***o
发帖数: 145 | 32 to get a lawyer to settle? please see that is how much the mother has spend
on all of her lawsuit, that is how many lawyers we have been going though.
Lawyers took money and did nothing, TOOK MONEY AND DID NOTHING!!!!
FILE COMPLAINT TO JUDICIAL PERFOMANCE COMMISSION, NOTHING HAPPENED!!! FILE
TO BAR ASSOCIATION, NOTHING HAPPENING.
WHERE IS JUSTICE???!!!!
Restraining order application: Case # GQ008930
Additional Declaration
that is the restraining order the mother file to the co... 阅读全帖 |
|
y***o
发帖数: 145 | 33 我的悲伤只有上帝知道：
Restraining order application: Case # GQ008930
Additional Declaration
After the initial application was filed, there were continuous wiretapping
and stalking activities by Mr. Ernest Hiroshige.
I believed Mr. Hiroshige approach to my my new tenant Frnk Castellanos, who
was reply a rental ad I post on the crag list on Sept 2nd 2012. Mr. Frank
Castellanos is a new tenant who had apply the plaintiff’s rental ad from
the crag list. And had him pass on threatening messa... 阅读全帖 |
|
c*********d
发帖数: 9770 | 34 论林彪反党集团的社会基础
On the Social Basis of the Lin Piao Anti-Party Clique
姚文元
by Yao Wen-yuan
[This article is reprinted from Peking Review, #10, March 7, 1975, pp. 5-10.]
毛主席在讲到必须搞清楚无产阶级对资产阶级专政的问题时明确指出：“林彪一类如上
台，搞资本主义很容易。因此，要多看点马列主义的书。”这就提出了一个极其重要的
问题：即“林彪一类”的阶级本质是什么？林彪反党集团产生的社会基础是什么？把这
个问题弄清楚，对于巩固无产阶级专政、防止资本主义复辟，对于坚定地执行党在社会
主义历史阶段的基本路线，一步一步地造成资产阶级既不能存在也不能再产生的条件，
无疑是十分必要的。
SPEAKING of the necessity for a clear understanding of the question of the
proletariat exercising dictatorship over the bourgeoisi... 阅读全帖 |
|
O**e
发帖数: 569 | 35 2014年09月29日 12:36
来源：中国日报网
16人参与 2评论
原标题：ISIS成员：正筹划在纽约发动猛烈袭击
中国日报网9月29日电（小唐） 据《纽约每日新闻》27日报道称，极端组织“伊斯兰国
”（ISIS）的一名成员宣称，该组织正筹划在纽约发动袭击，而其目标是未来让该组织
旗帜在白宫上空飘荡。
“如果情况允许的话，我们很快就会在纽约发动恐怖袭击。”这名自称法拉赫·希雷顿
的加拿大人通过视频对外界说，“很多兄弟正在那里进行活动。”他还断定美国的武装
分子势必发动一场猛烈的袭击。
他还说：“我还知道很多人——数以千计的人——目前生活在西部，准备好在你们的土
地上行动。”他们的终极目标是看到ISIS的旗帜飘扬在白宫上空。
伊拉克总理阿巴迪最近也提醒称恐怖分子要在纽约和巴黎的地铁发动袭击。为了安抚民
众的恐慌情绪，纽约市市长白思豪25日出现在纽约地铁，向市民保证地铁的安全性。此
外，警长和纽约州的州长还分别乘坐不同的地铁线，向公众证明地铁的安全性。白宫也
回应说，美方情报部门没有收到任何针对地铁的恐怖袭击情报，但表示会进一步研究伊
拉克方面的情报。
The great Ameri... 阅读全帖 |
|
l*y
发帖数: 21010 | 36 Remarks of President Barack Obama – State of the Union Address As Delivered
The White House is once again making the full text of the State of the
Union widely available online. The text, as prepared for delivery, is also
available on Medium and Facebook notes, continuing efforts to meet people
where they are and make the speech as accessible as possible. Through these
digital platforms, people can follow along with the speech as they watch in
real time, view charts and infographics on key areas... 阅读全帖 |
|
c******a
发帖数: 4400 | 37 http://www.amazon.com/The-Dark-Forest-Cixin-Liu/product-reviews
Probably the most cerebral (yet still accessable) book I've ever read. A
fantastic sequel to an incredible first book. If I say anything I think I'd
give it away. But if you want to know what our future could look like if we
were driven by fear, this is a great read. If you want to see how society
could change, how it would react differently, how the old becomes mythical,
larger than life, whilst still being just as human as any of ... 阅读全帖 |
|
|
l****z
发帖数: 29846 | 39 沙特阿拉伯公民被美国警方拘捕，涉嫌计划使用大规模毁灭性武器发动恐怖袭击，居住
在美国得克萨斯
Khalid Ali-M Aldawsari, 20, a citizen of Saudi Arabia and resident of
Lubbock, Texas, was arrested late yesterday by FBI agents in Texas on a
federal charge of attempted use of a weapon of mass destruction in
connection with his alleged purchase of chemicals and equipment necessary to
make an improvised explosive device (IED) and his research of potential U.S
. targets.
The arrest and the criminal complaint, which was unsealed in the Northern
Distri... 阅读全帖 |
|
l****z
发帖数: 29846 | 40 http://snowball5212.blog.hexun.com/71838905_d.html
中新网有篇报道名为《南苏丹共和国或将面临战争罪和反人类罪指控》, 它是这样肆无
忌惮造谣的：
据联合国新闻中心网站的消息, 联合国人权高级专员办公室本月早些时候发表初步
报告指出, 南苏丹军队在南科尔多凡州涉嫌严重侵权行为, 包括法外处决、任意逮捕和
非法拘禁、袭击平民等, 已致使大量平民流离失所。该消息称, 上述行为若被证实, 南
苏丹恐会面临战争罪和反人类罪的指控。
这个“南科尔多凡州(Southern Kordofan)”被划在北苏丹境内, 鬼知道“南苏丹军队
”怎么可能在那里搞什么“法外处决、任意逮捕和非法拘禁、袭击平民”, 况且该州人
民(努巴人)在从前的苏丹内战中支持南方, 在1993年就被巴希尔政府定了“叛教”罪名
(也就意味着可以随便杀), 今年从六月起的这场屠杀属于秋后算帐。
北苏丹政府军和民兵PDF(Popular Defence Forces)早就封锁了该地区的主要通道、连
联合国维和人员都不许进去, 就为了能杀得痛快彻底。那个“联合国新闻中心网站的消
息... 阅读全帖 |
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l****z
发帖数: 29846 | 41 Chavez: U.S. May Be Behind Leaders’ Cancer
Q
By Daniel Cancel - Dec 28, 2011 2:49 PM ET
Venezuelan President Hugo Chavez gives a speach during the swearing in of
the People's Guard to strengthen the fight against crime in Caracas.
Photographer: Leo Ramirez/AFP/Getty Images
Venezuelan President Hugo Chavez hinted that the U.S. may be behind a “very
strange” bout of cancer affecting several leaders aligned with him in
South America.
Chavez, speaking a day after Argentine President Cristina Fernand... 阅读全帖 |
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l****z
发帖数: 29846 | 42 July 9, 2012 by Warner Todd Huston
We are soon to be regaled by yet another movie from Hollyweird that likely
misunderstands the difference between liberty (or freedom) and equality.
This we might infer from the recently released advance plot synopsis for the
upcoming movie Elysium from Director Neil Blomkamp, director of the
surprise 2009 Sci Fi hit District 9.
Blomkamp’s new film is set in the not-too-distant future where the human
elite live in a cushy space station circling the Earth while... 阅读全帖 |
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w*********g
发帖数: 30882 | 43 【 以下文字转载自 Military 讨论区 】
发信人: wayofflying (小破熊), 信区: Military
标 题: 看来兔子的四代让美国抓狂了 FBI到处乱抓科技WSN
发信站: BBS 未名空间站 (Mon Nov 12 13:16:00 2012, 美东)
Chinese Smuggler Tried to Sneak Carbon Fiber for Fighter Jets, Feds Claim
By Robert BeckhusenEmail AuthorSeptember 28, 2012 | 6:30 am | Categories:
Spies, Secrecy and Surveillance
Exporting aerospace-grade carbon fiber isn’t easy, as it can be used to
build military planes like the F-22 Raptor. Photo: Air Force
The U.S. has busted up a plot to smuggle tons ... 阅读全帖 |
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l****z
发帖数: 29846 | 44 Muslims Think They Should Be Allowed to Ban ‘Others’ From Public Cemetery
Warner Todd Huston February 9, 2015
Over the weekend the family of a Muslim man buried in a British cemetery
demanded that a man of Gypsy descent be dug up and moved away after his
burial near their loved one. The Muslims claimed that in their “religion of
peace” it wasn’t permitted to have a Gypsy buried near a Muslim and so
demanded the right to control who is allowed to be buried in a public, non-
denominational cemet... 阅读全帖 |
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l****z
发帖数: 29846 | 45 There Have Been More Jihadist Terror Cases in U.S. in 2015 Than in Any Year
Since 9/11
By Michael W. Chapman | September 4, 2015 | 4:57 PM EDT
(CNSNews.com) – The “Terror Threat Snapshot” for August 2015, released by
the majority staff of the House Homeland Security Committee, states the
terror threat level in America is high and “getting steadily worse,” and
that there have been “more U.S.-based jihadist terror cases in 2015 than in
any full year since 9/11.”
The “Terror Threat Snapshot” also... 阅读全帖 |
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l*y
发帖数: 21010 | 46 【 以下文字转载自 Military 讨论区 】
发信人: ldy (大才001), 信区: Military
标 题: Obama的告别State of the Union Address演讲全文！太精彩了！
发信站: BBS 未名空间站 (Thu Jan 14 01:37:09 2016, 美东)
Remarks of President Barack Obama – State of the Union Address As Delivered
The White House is once again making the full text of the State of the
Union widely available online. The text, as prepared for delivery, is also
available on Medium and Facebook notes, continuing efforts to meet people
where they are and make the speech as accessible as... 阅读全帖 |
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s*******u
发帖数: 259 | 47 有的， search a journal, 然后点box plot, 就能看Q区了，就是排名的percentile.
The category box plot depicts the distribution of Impact Factors for all
journals in the category. The horizontal line that forms the top of the box
is the 25th percentile (Q1). The horizontal line that forms the bottom is
the 75th percentile (Q3). The horizontal line that intersects the box is the
median Impact Factor for the category.
Horizontal lines above and below the box, called whiskers, represent maximum
and minimum values.
The t... 阅读全帖 |
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E*******1
发帖数: 3464 | 48 Come on, man. This is not an issue about what programs are better, but a
thing about what programs are better suitably used or recognized, all right?
I know Word and Excel are perfect, but in scientific area, no paper will
accept Excel. On the other hand, can you accept a paper with handwriting now
? That is not because handwriting is not beautiful but because it is not
proper to use right here. And secondly, matlab is not for plotting, but for
program to plot, as long as you have data, you are ... 阅读全帖 |
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D**********s
发帖数: 3139 | 49 最近收到个问题，都是有关headroom的频响曲线的。可能里面有点小误区，我就画蛇添
足稍微说一下，尽量不罗嗦。
第一张附件图是一张plot出来的频响对比图，其中首先注意下面x轴，10,100,1000。。
。是log plot，所以有很多人为什么不测到20000的听力极限，其实测试是cover到的，
就在右面没有标横轴数字的竖线处。
第二张附件，是一个音乐的频响范围图，也是log plot，本来是给speaker的，借来用
用，可以看到，不少乐器都在100-10000这个区间，而且让这些乐器或者人声发出100或
10000附近的极限频率是在音乐中是比较少的，所以如果近似成高斯分布的话，围绕中
心就有个critical range，图上也标出了。欣赏音乐也更仰仗speaker在这个区间段的
表现。10k-16k之间多是谐振产生的区域，很多时候偶次的harmonic是很好听的，改善
音色令人愉悦，并不令人反感，录音的时候也很重视这个区间。但是接近20k附近的时
候，其实在音乐出出现几率很小，更多的时候只是一闪而过或者大动态的harmonic延伸
，声压过大也是会引起人反感的因素，有时候高... 阅读全帖 |
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p*****u
发帖数: 310 | 50 A group of farmers has some elevation data, and we’re going to help them
understand how rainfall flows over their farmland. We’ll represent the land
as a two-dimensional array of altitudes and use the following model, based
on the idea that water flows downhill:
If a cell’s four neighboring cells all have higher altitudes, we call this
cell a sink; water collects in sinks. Otherwise, water will flow to the
neighboring cell with the lowest altitude. If a cell is not a sink, you may
assume it has ... 阅读全帖 |
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