Displaying 7 results from an estimated 7 matches for "copellifulvio".
2004 Feb 21
3
saving variables created by functions in the workspace
Hello ,
just a simple question from a beginner:
I write the function:
plotsinx <- function()
{
x<-seq(0,2*pi,0.01)
sinx<-sin(x)
plot(sinx)
}
I recall it:
plotsinx()
and the plot works properly.
but then in the workspace if I want to look at the
values of sinx the following error is displayed:
Error: Object "sinx" not found.
How to save the variables created by the function on
2004 Mar 08
2
getting the std errors in the lm function
Hello,
I have a simple question for you:
making:
mylm<-lm(y~x)
summary(mylm)
I get the following results:
******************************************************
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 16.54087 0.19952 82.91 <2e-16 ***
x[1:19] -2.32337 0.04251 -54.66 <2e-16 ***
******************************************************
2004 Feb 23
2
deleting elements from an array/object
Hello,
I created a simple histogram with:
myHist<-hist(myData)
the object myHist now has two arrays (among the others):
myHist$mids
myHist$counts
Since myHist$counts contains some "0", and I want to calculate the linear fit among myHist$mids and log(myHist$counts), I want remove the elements of both arrays where these "0" occurs.
which are the possible solutions to
2004 Feb 15
1
linear regression of data with standard deviation
Hello everyone,
I know that to calculate the linear regression between x and y I
have to use the function "lm".
But how to do if x and y have a standard deviation like in the
following example?
How to compute the chi square test in this case?
Thank you,
Fulvio.
example:
x +- dx
5 2
13 4
17 4
23 6
y +- dy
6.3 0.6
9.2 0.9
14 1
21 4
2004 Mar 03
3
plot(x,y) with errors
Dear all,
I have 2 variables,
x<-c(1,2,3,4,5,6,7,8,9,10)
y<-c(1.3,2.5,4.6,5.3,5.9,6.7,7.4,8.5,9.4,10.4)
each point of the y variable has an error:
erry<-(0.2,0.3,0.2,0.1,0.4,0.2,0.3,0.4,0.3,0.2)
how to plot(x,y) with the errors segments?
Thank you,
Copex
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2004 Sep 28
1
call R scripts from python
Hello,
I have just learnt some python, and would like to call R scripts from python, without using batch mode.
I learnt how to do it from perl, in fact reading in the mail archive I found the following good example:
***************************************
#!/usr/local/bin/perl
open (FILE, ">test.txt");
print FILE "a,b,c,d,e\n1,2,3,4,5";
close FILE;
####### Start R
2004 Feb 28
1
Basic general statistical problem.
Hello everyone,
I'd like to have suggestions about a common basic statistical approach,
hope to be useful also for other R beginners.
When you first get some data (i.e length of river) you may want to look at its distribution.
Then you probably want to find which law follows this distribution,
and to test the goodness of the fit.
For doing this simple analysis I am writing some code