Hello,
here is an example from the manual. How to turn this minimization
problem into maximization problem, i.e. -(0 5 0) %*% b - 1/2 b^T b?
# Assume we want to minimize: -(0 5 0) %*% b + 1/2 b^T b
# under the constraints: A^T b = b0
# with b0 = (-8,2,0)^T
# and (-4 2 0)
# A = (-3 1 -2)
# ( 0 0
Hi everybody,
I'm trying to use cross-validation (cv.glm) for count data. Does someone know
which is the appropriate cost function for Poisson distribution?
Thank you in advance.
Valerio.
--
Scopri il nuovo MOTOROLA K1, il cellulare con
2006/11/8, Agner Fog [EMAIL PROTECTED]:
Thanks for the tip. I had thought of using the demo facility for this
but I didn't know how to check for the operating system.
See help about '.Platform'. I.e.,
.Platform$OS.type
can be useful.
This is a clumsy solution, but better than nothing. I
64bit does not make anything faster. It is only of use if you want to
use more then 4 GB of RAM of if you need a higher precision of your
variables
The dual core question: dual core is faster if programs are able to use
that. What is sure that R cannot make (until now) use of the two cores
if you
I'd like to compare tests based on the mixed model representation of
additive models, testing among others
y=f(x1)+f(x2) vs y=f(x1)+f(x2)+f(x1,x2)
(testing for additivity)
In mixed model representation, where X represents the unpenalized part of
the spline functions and Z the wiggly
Dear R developers
I am currently working on the seqinR package. The seqinR package
allows a remote access to biological databases via a socket connection.
We are using the functions socketConnection, writeLines and readLines
to open the socket, send request to the server and receive
On Wed, 8 Nov 2006, Stefan Grosse wrote:
64bit does not make anything faster. It is only of use if you want to
use more then 4 GB of RAM of if you need a higher precision of your
variables
The dual core question: dual core is faster if programs are able to use
that. What is sure that R
On Tuesday 07 November 2006 19:28, Randall C Johnson [Contr.] wrote:
On 11/7/06 11:28 AM, Ramon Diaz-Uriarte [EMAIL PROTECTED] wrote:
On Tuesday 07 November 2006 15:56, Randall C Johnson [Contr.] wrote:
Hello everyone,
I've been fiddling around with the snow and Rmpi packages on my new
Does anyone know where I can find any tool for Windows that converts
dates from ordinary formats into POSIX?
I need it to import sime time series from Excel into R and use them
with its package.
Thanks!
__
R-help@stat.math.ethz.ch mailing list
Thank you for help with the first part. The second part I do not understand.
All I get is 3 3. Presumably this is the factor that you refer to. Is there
no simple way of extracting the text alone
- Forwarded Message
From: Peter Alspach [EMAIL PROTECTED]
To: Jabez Wilson [EMAIL
Hi to all,
I have some problems to get the times-scale to the x-axis the times are
coming from an excel sheet f. e
[1] 0:01:00 0:02:00 0:03:00 0:04:00 0:05:00 0:06:00 0:07:00
[8] 0:08:00 0:09:00 0:10:00 0:11:00 0:12:00 0:13:00 0:14:00
[15] 0:15:00 0:16:00 0:17:00 0:18:00 0:19:00 0:20:00 0:21:00
?strptime in R.
However, if you want to convert dates (and not date-times), see ?as.Date,
using the 'format' argument.
On Wed, 8 Nov 2006, Ivan Kalafatic wrote:
Does anyone know where I can find any tool for Windows that converts
dates from ordinary formats into POSIX?
I need it to import
Xiaodong Jin wrote:
how to realize the following SQL command in R?
select distinct A, B, count(C)
from TABLE
group by A, B
;
quit;
Best Regards
You don't say which database you are using, but I have found RODBC to be
very effective.
library(RODBC)
Have a look at
Try this:
plot(z, xaxt = n)
xt - paste(23, seq(5, 50, 5), sep = :)
axis(1, times(paste(xt, 0, sep = :)), xt)
On 11/8/06, Carmen Meier [EMAIL PROTECTED] wrote:
Hi to all,
I have some problems to get the times-scale to the x-axis the times are
coming from an excel sheet f. e
[1] 0:01:00
There is a discussion and code in the R News 4/1 help desk article.
On 11/8/06, Ivan Kalafatic [EMAIL PROTECTED] wrote:
Does anyone know where I can find any tool for Windows that converts
dates from ordinary formats into POSIX?
I need it to import sime time series from Excel into R and use
'EBImage' R-package from www.bioconductor.org. It's based on ImageMagick and
will allow you to do this and much more with images of any time. The
prerequisite: either Linix/Unix or Mac (from source) -- will not work on
Windows.
On 07/11/06, Milton Cezar Ribeiro [EMAIL PROTECTED] wrote:
Hi
Thank you for your reply Gabor,
sure, the manually written axis works fine in any configuration.
but I would prefer an automatic input.
That means that I would like to use the datafield[1] for the minimum
time and the datafield[max] (means the last one) for the maximum time.
divided into x
Is the problem how to produce an axis with a given minimum tick,
maximum tick and given number of ticks? In that case try this
(if not explain further):
# input data
# z is from original example
mn - times(23:00:00)
mx - times(23:55:00)
n - 12
xt - times(seq(mn, mx, length = n))
plot(z, xaxt =
Hi,
I'ma having some troubles installing R under Unix.
As it is written in the how to install R the ./configure
passed on but when I type make I recieve this error message
:
gmake[1]: Entering directory `/usr/local/R_HOME/R-2.4.0/m4'
gmake[1]: Nothing to be done for `R'.
gmake[1]: Leaving
Gabor Grothendieck schrieb:
Is the problem how to produce an axis with a given minimum tick,
maximum tick and given number of ticks? In that case try this
yes but ... ;-)
I started with an plain R gui
library(zoo)
library(chron)
# input data
# z is from original example
mn - times(23:00:00)
mx
On Tue, 7 Nov 2006, yongchuan wrote:
I'm doing a cox regression with frailty:
model - coxph(Surv(Start,Stop,Terminated)~ X + frailty(id),table)
I understand that model$frail returns the group level frailty
terms. Does this mean this is the average of the frailty
values for the respective
Dear All,
Having now successfully started using Sweave, I have just noticed an odd
side effect with fonts.
Using plain LaTeX, I have had no problems using \usepackage{palatino} or
\usepackage{times} and the font correctly changes.
However, once I convert the tex document into Snw, and run it
My understanding is that the main point of your post was how to get times
on the X axis. hopefully at this point its clear how to do that and you can
come up with some algorithm to put whatever points you want on.
Here is a slight generalization although you will likely have to generalize
it
Jin,
Xiaodong Jin close2ceo at yahoo.com writes:
how to realize the following SQL command in R?
select distinct A, B, count(C)
from TABLE
group by A, B
;
quit;
if you want to perform such query on a data.frame! then
table(table$a, table$b)
will produce similar output, but
Dear All,
I am using wilcox.test to test two samples, data_a and data_b, earch sample has
3 replicates, suppose data_a and data_b are 20*3 matrix. Then I used the
following to test the null hypothesis (they are from same distribution.):
wilcox.test(x=data_a, y=data_b, alternative=g)
I got
?gzcon may help, depending exactly what you mean by `zlib-compressed
data'. If not, its code will provide you with a prototype to work on.
There are also private entry points in connections.c to (de)compress
blocks of data to/from a raw vector which again may be a useful statring
point for
Try
\usepackage[noae]{Sweave}
-roger
Mark Wardle wrote:
Dear All,
Having now successfully started using Sweave, I have just noticed an odd
side effect with fonts.
Using plain LaTeX, I have had no problems using \usepackage{palatino} or
\usepackage{times} and the font correctly changes.
Gabor Grothendieck schrieb:
My understanding is that the main point of your post was how to get times
on the X axis. hopefully at this point its clear how to do that and
you can
come up with some algorithm to put whatever points you want on.
That´s right thank you
Here is a slight
On Wed, 8 Nov 2006, Baoqiang Cao wrote:
Dear All,
I am using wilcox.test to test two samples, data_a and data_b, earch sample
has 3 replicates, suppose data_a and data_b are 20*3 matrix. Then I used the
following to test the null hypothesis (they are from same distribution.):
You indicated that one of the solutions did not work for you but
I am not clear which one you were referring to. To avoid confusion
I have deleted all my and your comments except for the following
which works for me if I paste it into a fresh session using
Edit | Paste commands only
menu in
The questions you ask about the interactions in the model not
making sense relates, I believe, to a multiple comparisons issue that is
not adequately addressed by the stepAIC analysis you did. To understand
this, note first that you've got something close to 2^(2^5) possible
models:
Hi R-friends
I need to read a big matrix (something like 1024000x1024) into 1000 small
matrices. After that, I need write each small matrix (1024x1024) into a asc
file, putting de index of matrix (1:1000) on the file name.
I´m makint it by a hard and unelegant way:
Thanks Torsten! I got it!
Best,
Baoqiang
Original message
Date: Wed, 8 Nov 2006 17:26:18 +0100 (CET)
From: Torsten Hothorn [EMAIL PROTECTED]
Subject: Re: [R] interprete wilcox.test results
To: Baoqiang Cao [EMAIL PROTECTED]
Cc: r-help@stat.math.ethz.ch
On Wed, 8 Nov 2006,
Ultimately, I would like to launch R (from another application) with a
script as an argument that creates a plot. I am running on Windows XP with
R 2.4.0. I currently can do this with S-Plus from my application by giving
this command:
C:\Program Files\Insightful\splus62\cmd\splus.exe
All,
I have tried to compile the RMySQL from source as specified in the
documentation. I am receiving the following errors
*** beginning of cygwin window
[EMAIL PROTECTED] /cygdrive/d/Program Files/R/bin
$ Rcmd build --binary ../library/RMySQL
*
Hi everyone,
I'm trying to integrate f(x) over x where f(x) does not have a close form
but only numerical values at certurn knots of x. Is there a way that I can
use any generical R function (such as integrate) or any package to do so?
Thanks! I appreciate your time.
Best Regards,
Martha Cao
You say, I have looked at a few spline packages in R, but didn't
find what I was looking for. Could somebody please point me in the
right direction? It's difficult to comment without more information on
what you've tried and why you thought it was not adequate. Please
provide
Yes this one works, but (sorry) in the OP there was a plot without data
to define the range
So I tried to use your working suggestion in that manner:
library(zoo)
library(chron)
time -
c(2:25:00,2:26:00,2:27:00,2:28:00,2:29:00,2:30:00,2:31:00,
You might try the statmod package which provides nodes and weights for
gaussian quadrature.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Xiaofan Cao
Sent: Wednesday, November 08, 2006 12:43 PM
To: r-help@stat.math.ethz.ch
Subject: [R] Numerical
Prof. Ripley,
Do you mind providing some pointers on how coarse-grained parallelism
could be implemented on a Windows environment? Would it be as simple as
running two R-console sessions and then (manually) combining the results of
these simulations. Or it would be better to run them as batch
Xiaodong Jin [EMAIL PROTECTED] writes:
y
[1] 1 11 42 64 108 173 214
t
[1] 1 2 3 4 5 6 7
nls(1/y ~ c*exp(-a*b*t)+1/b, start=list(a=0.001,b=250,c=5), trace=TRUE)
29.93322 :0.001 250.000 5.000
Error in numericDeriv(form[[3]], names(ind), env) :
Missing
I assume this is windoze. Have you considered using the Rterm? You can
have in your script the plot to be created as an eps file
Lanre
Bill Bachman wrote:
Ultimately, I would like to launch R (from another application) with a
script as an argument that creates a plot. I am running on Windows
You could approximate it with splines and then integrate that:
x - 0:10/10
f - function(x) 1 + x + x^2 + x^3 + x^4
y - f(x)
fs - splinefun(x, y)
integrate(fs, 0, 1)
integrate(f, 0, 1)
On 11/8/06, Xiaofan Cao [EMAIL PROTECTED] wrote:
Hi everyone,
I'm trying to integrate f(x) over x where f(x)
On Wed, 8 Nov 2006, Christos Hatzis wrote:
Prof. Ripley,
Do you mind providing some pointers on how coarse-grained parallelism
could be implemented on a Windows environment? Would it be as simple as
running two R-console sessions and then (manually) combining the results of
these
Your code plots x which has nothing to do with xt.
On 11/8/06, Carmen Meier [EMAIL PROTECTED] wrote:
Yes this one works, but (sorry) in the OP there was a plot without data
to define the range
So I tried to use your working suggestion in that manner:
library(zoo)
library(chron)
time -
All,
After staring at this error message for an hour or so yesterday and this
morning. I decided to try something else. Low and behold trying to
build the package in cygwin causes R to try and build under linux/unix
not windows. I went to the command prompt and was able to build the
Great. I will try it.
Thank you.
-Christos
-Original Message-
From: Prof Brian Ripley [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 08, 2006 1:21 PM
To: Christos Hatzis
Cc: 'Stefan Grosse'; r-help@stat.math.ethz.ch; 'Taka Matzmoto'
Subject: RE: [R] CPU or memory
On Wed, 8 Nov
Prof Brian Ripley wrote:
?gzcon may help, depending exactly what you mean by `zlib-compressed
data'. If not, its code will provide you with a prototype to work on.
There are also private entry points in connections.c to (de)compress
blocks of data to/from a raw vector which again may be a
On Nov 8, 2006, at 11:12 AM, Patrick Burns wrote:
My guess is that you have a data frame and not a matrix.
Try
barplot(as.matrix(rs))
See chapter 1 of S Poetry for an explanation of data structures
in R.
Thanks, Patrick,
You are completely right. I've been trying to plot a data frame.
2006/11/8, Lanre Okusanya [EMAIL PROTECTED]:
I assume this is windoze. Have you considered using the Rterm? You can
windows... afaic
try with R.exe or, as said and imho better, Rterm.exe. Examples
testR.bat:
set cmd=C:\Programme\R\R-2.3.1\Bin\R.exe
call %cmd% CMD BATCH --slave --vanilla
On Nov 8, 2006, at 11:41 AM, Michael Kubovy wrote:
On Nov 8, 2006, at 4:44 AM, Ricardo Rodríguez wrote:
Hi Ricardo,
You probably have two columns in 'rs'. You need to do the barplot
on one of them and use the other as the vector of labels. Assuming
that the first column is n and the
Hi everyone,
I downloaded the source code available at:
http://cran.fhcrc.org/src/base/R-2/R-2.4.0.tar.gz
to a linux machine (Linux 2.6.11-1.1369_FC4smp #1 SMP).
I successfully configured and compiled it, which means I'm able to
run it from the R-2.4.0/bin directory.
I want to do a system
Thank you to Paul Murrell for a solution:
# test.R
require(graphics)
a-c(1,2,3,4)
b-c(1,4,9,16)
plot(a,b)
-Original Message-
From: Lanre Okusanya [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 08, 2006 1:04 PM
To: Bill Bachman
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] can
should I be able to read in a table of 1mln by 100 into R or it's too
big?
Thank you very much
stephen
[[alternative HTML version deleted]]
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read
Is there any way to read and decompress inside R tar and bzip2 files ?
Thanks
D
-
Stay ahead of the information curve.
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Hello, new to the list, first message.
This question perhaps might be more appropriate to R-sig-teaching,
and I'd be happy to take it there if this is not the right place for it.
I am teaching applied statistics at a small liberal arts college with
limited resources, and we are currently
Gabor Grothendieck schrieb:
Your code plots x which has nothing to do with xt.
The same result if you change xt to x: 02:25 at the origin nothing else
- I do not know why
#-- your suggestion
mn - times(min_time)
mx - times(max_time)
n - 12
t - times(seq(mn, mx, length =
Hi,
Why do I get error msg by calling superpc.plotcv (see below)? I use superpc v.
1.0.4 and R 2.2.1
thanks
Haleh
--
set.seed(332)
x-matrix(rnorm(1000*40),ncol=40)
y-10+svd(x[1:60,])$v[,1]+ .1*rnorm(40)
censoring.status-
On Wed, Nov 08, 2006 at 09:49:50AM -0800, Spencer Graves wrote:
You say, I have looked at a few spline packages in R, but didn't
find what I was looking for. Could somebody please point me in the
right direction? It's difficult to comment without more information on
what you've tried
Christine A. Calmes [EMAIL PROTECTED] wrote:
[...] Basically, I am trying to test a
psychological model in which a person's level of passive, negative
communication with others in their environment (CORUMTO) on one week
predicts their level of depression on the following week (BDIAFTER)
R users,
I posted a message on error message for row names. I looked at a saved
file that has a list structure.
I found that some of list components have row.names = c(NA, 1000). I
compared what I did with R.2.3.0 with what I did with R.2.4.0.
Previously, with R.2.3.0, row.names = c(1, 2, 3,
Hi Ravi and Harold,
Thanks for the input. I'm using trapezoidal rule and like to know if
there's other alternatives. This f(x) is the kernel density estimator and
thus we can get an estimate of f(x) at any given x in theory.
Thanks again,
Martha
On Wed, 8
Nov 2006, Ravi Varadhan wrote:
I would like to thank all who replied to my question about the efficiency of
various cpu's in R.
Following the advice of Bogdan Romocea I have put a sample simulation and
the latest version of R on a USB drive and will go to a few suppliers to try
it out. I will report back if I find anything of
bzip2-ped files can be read via the bzfile() connection function. I don't
think
there's a way to read from tar files though.
-roger
DrakeGis wrote:
Is there any way to read and decompress inside R tar and bzip2 files ?
Thanks
D
-
Stay
Please provide a complete self contained example. I can't follow the
partial code below; however, its likely you are plotting one thing
and creating axes using another so there is no reason it should
come out right.
On 11/8/06, Carmen Meier [EMAIL PROTECTED] wrote:
Gabor Grothendieck schrieb:
Roger D. Peng wrote:
Try
\usepackage[noae]{Sweave}
-roger
Works perfectly - many thanks!
Best wishes,
Mark
--
Dr. Mark Wardle
Clinical research fellow and Specialist Registrar in Neurology,
C2-B2 link, Cardiff University, Heath Park, CARDIFF, CF14 4XN. UK
On Wed, 8 Nov 2006, Taka Matzmoto wrote:
Hi R users -
I got an error message when reading in a saved file (a list structure)
dget(REPLICATION001)
Error in attributes(.Data) - c(attributes(.Data), attrib) :
row names must be 'character' or 'integer', not 'double'
I don't need row
I am running R 2.3.1 on a Windows XP machine. I have a large dataset of
over 13 000 cases of a disease for which I am attempting to build a
prognostic model using Cox proportional hazards regression. Some of the
continuous covariates are skewed and therefore require transformation
for use in
Dear All,
I am lost about the following. I have got a large dataframe (largeset) with in
the first column identification numbers as factors
largeset$ID
p000345
p000356
p000569
etc
--
in order to use them to merge with another dataframe with numerical values
(000345, 000356) I
Taka Matzmoto [EMAIL PROTECTED] writes:
R users,
I posted a message on error message for row names. I looked at a saved
file that has a list structure.
I found that some of list components have row.names = c(NA, 1000). I
compared what I did with R.2.3.0 with what I did with R.2.4.0.
Hello Jenifer,
your question reflects some very interesting statistical problems,
surrounding the effects of subset selection upon estimation and
inference. There does not seem to be a right answer, as far as I am
aware, so I will offer an opinion. I'd welcome further discussion. I
don't have
Check http://cran.r-project.org/doc/FAQ/R-FAQ.html#R-and-S and
following links. R has a 95% overlap with S and S+, and those two are
popular enough that statistics books target them (e.g., Venables and
Ripley).
I am teaching applied statistics at a small liberal arts college with
limited
On Wed, 2006-11-08 at 23:16 +0100, Marco Boks wrote:
Dear All,
I am lost about the following. I have got a large dataframe (largeset)
with in the first column identification numbers as factors
largeset$ID
p000345
p000356
p000569
etc
in order to use them to merge with another
Joe Byers wrote:
All,
After staring at this error message for an hour or so yesterday and this
morning. I decided to try something else. Low and behold trying to
build the package in cygwin causes R to try and build under linux/unix
not windows. I went to the command prompt and was
Carmen,
Gabor has already given you the detail you ask for, but might try the
following plot to see what is going wrong:
plot(times(tt), x, type='l')
This does not give you the EXACT control of the axis you asked for, but this
simple plot command gives you a fairly nice result. It
On Wed, 2006-11-08 at 15:55 -0500, Charilaos Skiadas wrote:
Hello, new to the list, first message.
This question perhaps might be more appropriate to R-sig-teaching,
and I'd be happy to take it there if this is not the right place for it.
I am teaching applied statistics at a small
Hi everybody,
I'm a new member of the list. I'm just starting to use R.
I'm looking for information about stripcharts. I didn't find a lot on the web.
Outside http://www.maths.lth.se/help/R/.R/library/graphics/html/stripchart.html
there isn't much I found.
I'm trying to create three vertical
Hi List,
Is there anyway to estimate the parameters with integral forms?
Here is the function. The idea is to calculate the real mean from the censored
mean given normal distribution.
I have the function as
trun.mean- function(mu,sigma,t) # t is the threshold
{
f - function(x)
On 11/8/06, Marc Feuerstein [EMAIL PROTECTED] wrote:
Hi everybody,
I'm a new member of the list. I'm just starting to use R.
I'm looking for information about stripcharts. I didn't find a lot on the
web. Outside
http://www.maths.lth.se/help/R/.R/library/graphics/html/stripchart.html there
Hi,
I am using Tinn-R and somehow I cannot point it to
start a R shortcut with http_proxy settings including
authentification. It always shows the .exe.
Is there any way to set the proxy from within R or any
other ideas how to do it?
I am using R 2.4 for Windows.
Thanks a million,
Werner
On the other hand, at least one _other_ authoritative statistician I
know claims that he will never bother to test a term that he can't
interpret - he usually draws the line at three-way interactions. So,
opinions are divided among the authorities.
This leaves you very vulnerable to your
Good point, Hadley.
But for the purpose of discussion, then, what would you think about
5-way interactions? Or ten-way interactions? Surely one has to draw
the line somewhere.
I suppose that a generalization of my summary of that position would
be: ask yourself if you can interpret a term,
My understanding is that it doesn't have much to do with 32- vs. 64-bit,
but what the instruction sets of the CPUs. If I'm not mistaken, at the
same clock speed, a P4 would run slower than PIII simply because P4 does
less per clock-cycle. Also, I believe for the same architecture, single
core
Frank,
I will post a zip file of the RMySQL 5.10 on my university web site
www.cba.utulsa.edu/byersj under the Research and Analytics link in the
next day or two.
Here at the University we had a major technology problem in the college
of business causing IT to move up a migration time table
Are you familiar with www.bioconductor.org? They have a
listserve with people who may know more about the question you asked.
Spencer Graves
sun wrote:
Hi,
I am looking for genetic optimization package that allow to define my own
chromosome solution and crossover/mutation
Frank,
While I was replying to you our IT guys sent me a message as said I
could connect. I have posted the RMySQL zip file at
http://bus.cba.utulsa.edu/byersj/Research.asp
Good luck to all
Joe
Frank McCown wrote:
Joe Byers wrote:
All,
After staring at this error message for an hour or
Frank,
While I was replying to you our IT guys sent me a message as said I
could connect. I have posted the RMySQL zip file at
http://bus.cba.utulsa.edu/byersj/Research.asp
Good luck to all
Joe
Frank McCown wrote:
Joe Byers wrote:
All,
After staring at this error message for an hour or
Can R do a repeated measures MANOVA and tell what dimensionality the
statistical variance occupies?
I have been using MATLAB and SPSS to do my statistics. MATLAB can do ANOVAs
and MANOVAs. When it performs a MANOVA, it returns a
parameter d that estimates the dimensionality in which the means
On Thu, 9 Nov 2006, Werner Wernersen wrote:
I am using Tinn-R and somehow I cannot point it to
start a R shortcut with http_proxy settings including
authentification. It always shows the .exe.
Is there any way to set the proxy from within R or any
other ideas how to do it?
From the help
Gabor Grothendieck schrieb:
Please provide a complete self contained example. I can't follow the
partial code below; however, its likely you are plotting one thing
and creating axes using another so there is no reason it should
come out right.
You are right .. seems to be that it was too
Dear List,
I am (again) looking at meta-regression as a way to refine meta-analytic
results. What I want to do is to assess the impact of some fixed factors
on the results of a meta-analysis. Some of them may be crossed with the
main factor of the meta-analysis (e. g. clinical presentation of a
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