I am trying to find the analytical solution to this differential equation
dR/dt = k1*(R^k2)*(1-(R/Rmax)); R(0) = Ro
If there is an analytial solution to this differential equation then it
It is a polynomial function of R, so just develop the expression and
when you get the two terms in R
Which format is better? pdf, jpeg or tiff?
png and jpeg are bitmap formats, and you can trigger the resolution
playing with options width, height (in pixels) and res (nominal DPI)
till you find what is suitable for your purpose. Png is definitely the
way to go for graphs.
Pdf is the overall best
Hi,
I recently have started using R again on a Linux box after spending several
years on a Mac. Last I checked, the best way to use R was through EMACS
using something like ESS. I remember that being serviceable but not always
the most convenient.
Is there anything comparable to the mac
,
scionforbai
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)
plot3d(mydata)
solution 2:
td - as.numeric(td)
...
price - as.numeric(price)
plot3d(td,contractdate,price)
Bye,
ScionForbai
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My question: is there a way to add axes the usual way (as tried for the
first graphic), but to erase the margin, so that the axes start at point
(0/0) in my case.
Not really sure if this is what you ask, but maybe you should call
your first plot() with xaxs=i and yaxs=i. It reduces the default
Hi Czqiu,
short answer:
?expression
?eval
?quote
?parse
?deparse
?substitute
Bye,
Scionforbai
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(and quickest) moving average that you can do.
For more complicated examples, and for 3d, you have to go a little
further, but the principle holds.
ScionForbai
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working and
avoid problems.
Should I install another flavour of Linux ?
It depends. Ubuntu is good to start, and has the widest users base;
Archlinux my best choice (but you need to be already somewhat
advanced).
ScionForbai
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- krigging in package fields, which also requires irregular spaced data
That kriging requires irregularly spaced data sounds new to me ;) It
cannot be, you misread something (I feel free to say that even if I
never used that package).
It can be tricky doing kriging, though, if you're not
I found this link:
http://jesus-loves-grass.blogspot.com/search/label/R%20server
Which points to RSOAP and Rserver.
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help.start(), then Writing R extensions.
You can link fortran subroutines to R by compiling them in a shared
library (.so or .dll depending on your system) by the command:
R CMD SHLIB file1.f file2.f -o myfortransubroutines.so
and then from R you first
dyn.load(myfortransubroutines.so)
and
Hi Denver,
I want to calculate the return say AMR,so I use
If data is a matrix or a data.frame you need to use the correct
index: [row,col] instead of [row]. Try:
re=numeric(10)
for (i in 2:nrow(data)) {
re[1]=0
re[i]=log(data[i,1]/data[i-1,1])
}
This works, but of course you have
Do you need something more than a simple ssh connection to a remote
host in which you run R (trivial when the server is Linux)?
My advice is to run R in a screen session on the remote host (it
protects from sudden disconnections). Then you have a window on your
screen with the R command line,
If what you want is a lognormal distribution of n values you can use
the following transformations:
lognorm1 - M*exp((rnorm(n)*sigma)-sigma^2/2.)
which gives a lognormal distribution such that:
mean(lognorm1)=M ;
var(lognorm1)=M^2*(exp(sigma^2)-1);
Changing the sigma (standard deviation) you
).
ScionForbai
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plot(x1,y1,b,xlim=range(x1), ylim=c(0, 170),pch=16,cex=2,axes=FALSE,ann=FALSE)
par(col=grey50, fg=grey50, col.axis=grey50)
axis(1, at=seq(0, 16, 4))
axis(2, at=seq(0, 170, 10))
axis(4, at=seq(0, 170, 10))
par(new=TRUE)
plot(x2,y2,b,xlim=range(x2), ylim=c(0, 170),pch=21,cex=2,axes=FALSE,ann=FALSE)
Any suggestions?
When generating a bitmap (png is then the best solution) you can
control the resolution with width and height parameters (in
pixels):
png(myimage.png,width=1800,height=1800)
Then you just need to raster yor graph in an adequate resolution (more
pixels means bigger file, of
It would be dumb to ignore the fact that Excel is a very widespread
program, and therefore in the real world we are very likely to
encounter data formatted by Excel.
Of course I know the widespreading of such programs. But the point is:
how can we start to change this in the real world? People
I would start R with the command:
http_proxy=http://SERVER:3128; R
and then from R I would try:
install.packages(Rcmdr, dep = TRUE, method = wget)
provided that you have wget installed on your system (which I think).
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Such workarounds should normally be avoided.
You forgot to mention: Excel should normally be avoided.
Risk of scrambling data while exporting to a simple ascii formatted text file?
Is it a joke?
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I just wonder: why should R and its community try to support such an
awful program, with its protected formats and unmantained
features/bugs?
I mean, from both philosophical and technical point of view: R is free
software and should rather try to be 'viral' than to compete. It
already has the
is it only me or has anyone else the problem that running an R
process within emacs is way much slower than in a regular terminal/
console?
It's just you, and if you think some more about it, you'll see
why we are all grinning. [ Hint: it can't be slower, outside of
ridiculous corner
great.
ScionForbai
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of continuity.
I very often have to produce 512x512 images, and it doesn't seem to be
any particularly intensive procedure; I mean, it is done within
seconds.
ScionForbai
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version.string R version 2.4.1 (2006-12-18)
locale is: LANG=it_IT.UTF-8
What is this multibyte string? Does it depend on LOCALE settings?
Where can I find further docs on this way to pass character
descriptors?
Thanks,
ScionForbai
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