search for: ptitbleu

Hello, I have a text file with one column containing long number but stored as string. I download the file with read.table (and colClass) and the first row of this column is : "095842087016731010" As I need to make some calculations with these numbers, I tried to convert them using as.numeric. But then I get as.numeric("095842087016731010") 95842087016731008 I understand

Hello, I discovered R two years ago and thanks to the R-community I managed to write some scripts to analyze my data stored in mysql databases. The only problem is that I am the only one using R in the lab. Colleagues mainly use Matlab (but not with mysql, only with text files) but regularly come to me to get data treated with R-scripts !!!. To allow the use of my scripts by other people, my

Hello, I'm looking for a R-package to solve such an equation : http://n4.nabble.com/file/n1590462/iv.png which is one current-voltage equation of a solar cell. Thanks in advance, Ptit Bleu. -- View this message in context: http://n4.nabble.com/looking-for-a-package-to-solve-current-voltage-equation-I-f-I-tp1590462p1590462.html Sent from the R help mailing list archive at Nabble.com.

Hello, In one of my functions, I need to extract the hour from a date. For example: as.POSIXlt("2010-03-27 02:00:00")$hour gives 2 as expected. It works for all the dates I've tested except the following one which is in my list of dates: as.POSIXlt("2010-03-28 02:00:00")$hour which gives 0. I don't understand why it doesn't work with this particular date. Any

Hello, I would like to know if it exists a package including something equivalent to this page: http://www.developpez.net/forums/d740403/autres-langages/algorithmes/contribuez/image-geometrie-projective-homography/ http://www.developpez.net/forums/d740403/autres-langages/algorithmes/contribuez/image-geometrie-projective-homography/ I've searched with these keywords: R-project homography

Hello, I convinced our new Ph student to work with R and I managed to convince the guy in charge of the computer networks to install R 2.12.0 (we haven't the admin rights). I wanted to install on his computer the same packages I use (but I have R 2.11) and especially RMySQL. Problem : there is no more RMySQL package in the list pf the packages. I've tried to install my version but it is

Hello, I've two data.frames (data1 and data4), dec="." and sep=";". http://r.789695.n4.nabble.com/file/n4199964/data1.txt data1.txt http://r.789695.n4.nabble.com/file/n4199964/data4.txt data4.txt When I do plot(data1$nx,data1$ny, col="red") points(data4$nx,data4$ny, col="blue") , results seem very similar (at least to me) but the R-squared of

Hello, I have a "friday" problem. I'm trying to plot the number of measures by day with this command between the 2008-07-31 and the 2009-11-13 (it works) : plot(unique(as.Date(strptime(data$date, format="%Y-%m-%d %H:%M:%S))), measuresbyday) then I would like to plot vertical lines for each month. But it doesn't work because par()$usr gives 14071.16 14579.84 -7.16 213.16

Hello, Sorry in advance for adding a silly question on this forum but I haven't found the right keywords to find a solution to this basic problem. I'm just looking a way to have a white background behind the legend to hide the grid. Thanks in advance. The silly example for my silly question: xyplot(1~1, panel = function(x,y, ...) { panel.xyplot(x,y)

Hello, I would like to get a lattice plot of 8 panels (unique(df$fact)=8) with 2 graphs (df$y1 and df$y2 as a function of df$x) and 1 red point at (500, ymax) per panel. The script below is quite ok but I'm not able to define two different colors for the two graphs. If you have an idea how to use the "col" function in order to attribute the colors, it will be very kind of you to

I'm plotting a lattice bwplot from a data.frame and would like to add some horizontal lines indicating some reference values (preferably with text annotation) as well as a grid of regular log tics. The following illustrates the plot: data(ToothGrowth) require("lattice") p = bwplot(exp(len) ~ supp, ToothGrowth, panel = function(..., box.ratio) { panel.grid(h=-1,

Hello, I'm trying to fit experimental data with a model and nls. For some experiments, I have data with x from 0 to 1.2 and the fit is quite good. But it can happen that I have data only the [0,0.8] range (see the example below) and, then, the fit is not correct. I would like to add a constraint, for example : the second derivative must be positive. But I don't know how to add this to

Hello, I would like to plot the following xyplot : for each date of fff (1 date per panel), bbb=f(aaa) for the two groups (ddd=1 and ddd=2) superimposed. I can do it by group (see below) but not together. I looked at http://lmdvr.r-forge.r-project.org/figures/figures.html but I haven't found what I was looking for (to be honest, I haven't understood all the examples). Any help will be

Hello, I would like to replace a for loop with lapply in order to speed up the treatment of my data (I've read lapply can help to do it). At the end of the message, you will find a simple example (function is more complex and data frames is more than 1 million of rows) of what I would like to do, that is applying the same calculation to all the rows of the data frame (knowing that I cannot

...imum > likelihood (Steven Craig) > 37. Re: How to turn a LaTeX Sweave file (Rnw) into > .HTML/.odf/.docx? (under windows) (Frank Harrell) > 38. spatstat => owin + image (tkdweber) > 39. tikzDevice install problem (Helena Pe?a) > 40. Homography with R (PtitBleu) > 41. Re: identifying cells in data frames with the same value > (stevesp101) > 42. [R-pkgs] new package 'SeleMix' for selective editing > (Teresa Buglielli) > 43. Re: tikzDevice install problem (Uwe Ligges) > 44. sorting multiple columns of a ma...

...tp://decisionstats.com [[alternative HTML version deleted]] ------------------------------ Message: 85 Date: Sat, 22 Jan 2011 08:58:11 +0100 (CET) From: Sascha Vieweg <saschaview@gmail.com> To: Spencer Graves <spencer.graves@structuremonitoring.com> Cc: r-help@r-project.org, PtitBleu <ptit_bleu@yahoo.fr> Subject: Re: [R] Accessing MySQL Database in R Message-ID: <alpine.OSX.2.00.1101220856040.18654@dngan> Content-Type: TEXT/PLAIN; charset=UTF-8; format=flowed I think this is not an R issue, but one of MAMP. On my server's sql service, I can connect using passwo...

Hello, I'm trying to modify my r-script to use RODBC instead of DBI/RMySQL (no more ready-to-use package for windows). I would like to copy a data.frame of 44 columns to a table of 45 columns (the 45th is an autoincremental column). With the following commands, colnames(df)<- a vector with the names of the 44 columns

Hello, I'm still trying to modify my script in order to use RODBC instead of RMySQL (no more ready-to-use package for windows). My new problem is the following one (not seen with RMySQL): I'd like to copy a data.frame to a mysql table. One column is a numeric one with big integer like : 2005000206110 (13 figures) If I type this number in R, I get: 2.005e+12 and when I use sqlSave to

Hello, After a (bad) first try some months ago, I'm trying again to use RODBC package instead of DBI+RMySQL packages to populate MySQL database. The main command is sqlSave(channel, data_df, tablename, append=T, rownames=FALSE, colnames=FALSE, fast=FALSE, varTypes=vartypes) where data_df is the data.frame I want to save and vartypes is obtained following the tip given here

Hello, >From the data provided in the attached file, I would like to find the seasonal effect and the trend (if there are some) like in page 10 of the following document: http://www.statoek.wiso.uni-goettingen.de/veranstaltungen/zeitreihen/sommer03/ts_r_intro.pd http://www.statoek.wiso.uni-goettingen.de/veranstaltungen/zeitreihen/sommer03/ts_r_intro.pd f Small problem: I don't know how to