similar to: Area between 2 curves

Dear Community, i have read in a table with two column from a *txt-File. What i get is a data-frame wit two column. After that i allocate this 2 column to x and y. Plotting this, i obtain a picture that looks like a bar plot (something like a grid). Is that because x and y is in factor-formatted? A conversion with "asnumeric" doesnt work. I get a vector with "NA". Here is my

After many months, I am now banging my head against the wall because I can't find a solution to this seemingly trivial problem.  Any help would be appreciated: I am trying to apply a nonlinear fitting routine to a 3D MR image on a voxel-by-voxel basis.  I've tested the routine using simulated data and things went well.  As for the real data, the fitting routine

I have a question that must have a simple answer (but eludes me). I need a row-by-row logical comparison across three numeric variables in a data frame: foo$x, foo$y, foo$z. The logic is if( x < y || x > z ) 1 else 0 for a particular row. It is simple and very inefficient to use for(i in 1:length(foo$x)){ } loops. How can I accomplish this using sappy( ) / lapply( ) / apply( ) or

Hi all, I would like to calculate the area under the ROC curve for my predictive model. I have managed to plot points giving me the ROC curve. However, I do not know how to get the value of the area under. Does anybody know of a function that would give the result I want using an array of specificity and an array of sensitivity as input? Thanks, Olivier -- View this message in context:

Hello, I want to colorize the area between two curves, but one of these curves isn't continuous. The best solution I found is the 2nd example in the help of polygon, but how can I get no area filling for the missing data in the 2nd curve. example: x1 = c(1:8) x2 = c(1:8) y1 = c(1,5,6,1,4,5,5,5) y2 = c(0,3,3,NA,NA,1,3,4) plot(x1,y1,type="l") lines(x2,y2) for the missing parts I

Dear R helpers, I have a graph as following; I would like to highlight the overlapping area between the two curves. Do you know how to do this? Thank you in advance for your help. Nguyen ###START x1 <- rnorm(10000, 0.70,0.12) x2 <- rnorm(10000, 0.90,0.12) d1 <- density(x1) d2 <- density(x2) plot(range(d1$x,d2$x), range(d1$y, d2$y), type = "n", xlab = "X

Hello, I have a question regarding shading regions under curves to display 95% confidence intervals. I generated bootstrap results for the slope and intercept of a simple linear regression model using the following code (borrowed from JJ Faraway 2005): > attach(allposs.nine.d) > x<-model.matrix(~log(d.dist,10))[,-1] > bcoef<-matrix(0,1000,2) > for(i in 1:1000){ +

Trying to start one of my vms, a centos one at that, but am getting the following message: [root@vmhost ~]# virsh start voip --paused error: Failed to start domain voip error: cannot open file '/var/tmp/FreePBX-5.211.65-3-x86_64-Full-1388073872.iso': No such file or directory [root@vmhost ~]# But, virsh dumpxml voip shows no info onto the .iso <disk type='file'

I would like to integrate the area under a curve without any smoothing or the like- just on the raw numbers. I looked at integrate() but it requires a function which I assume means something like x+x^2+x^3 is there a built in function in R for this? #let's say x <- seq(1:50) y <- seq(1:50) plot(y~x) # the are would be 1250 # I would like to be able to do this but on more complicated

Hello, I want to know if there are some functions or packages to solve differential and integral equation using R. Thanks. Shao chunxuan. [[alternative HTML version deleted]]

Hello, does anybody know, how to reverse the elements of the x-axis. At now my x-axis for example goes from 0, 0.5, 1, 1.5, ... to 99.5, 100.0 Is there a way to change the x-axis, like this: 100.0, 99.5, 99.0, ..., 0.5, 0. The 100.0 should start at left x-axis and the 0 shold be on the right. Greeting -- View this message in context:

Hi, I have a data frame of 2 columns with the following types : data$day char data$value num And I plot my data with : plot(strptime(donnees$day,format="%Y-%m-%d %H:%M:%S"),donnees$value, type="l") And I'd just like to get the numerical value of the integration of this graph. I looked at ?integrate but, as far as I understood (that is, not very much, due to my poor

Hi, I want to make a plot with abline where the area below or above the curve is shaded. I can't find any documentation on that. Can anybody help me with that? thanks, Juffi

Dear Listers, I am drawing a plot of two density curves, for male and female incomes. I would like to shade/hatch/color (whatever) the areas under the curves which are distinctive for each gender. This is the code I have tried so far: m <- density(topmal.d$y, bw = "sj") f <- density(topfem.d$y, bw = "sj") par(mfrow = c(1,1)) plot(x = c(0,400), y = c(0,0.02), type =

I might be missing something but I thought that AUC was a measure for comparing ROC curves, so there is nothing else needed to "compare" them. The larger AUC is the higher correlation of 2 variables compared. No other measures or calculations are needed. Jarek Tuszynski -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On

Dear all, I try to compare the performances of several parameters to diagnose lameness in dogs. I have several ROC curves from the same dataset. I plotted the ROC curves and calculated AUC with the ROCR package. I would like to compare the AUC. I used the following program I found on R-help archives : From: Bernardo Rangel Tura Date: Thu 16 Dec 2004 - 07:30:37 EST

Hi, I want to know the area under a curve, which is not given as a function, but as values in a time series. It is not a smooth curve, but switches often between positive values and zero (the values describe the moisture in the soil over a year, one entry is one day). I already tried area.between.curves, but got only 0 as result. I guess, it doesn't work because of these multiple changes

Hi I have dataset that consists of two columns AB 0.102 AC -0.002 BA -0.102 BC 0.270 CA 0.002 CB -0.270 I wish to create a matrix so that I can eventually plot the data. A B C A 1 0.102 -0.002 B -0.102 1 0.27 C 0.002 -0.27 1 Any help or guidance would be greatly

Question on graphs: The default case for drawing a graph in R, is where a little space is left on the x and y axis before the first tick i.e. even if I say xlim=c(0,1) -- there will be some space between the edge of the x-axis and where 0 is placed. If I want 0 on the edge, how do I do it in R? Area under the curve: I have a 45 degree line and a curve above or below it. Is there a way in R

Dear useRs, my question could be very basic for which i apologize in advance. Each column of a matrix with dimensions 365 rows and 37 columns was drawn against another matrix of dimensions 365 rows and 1 column. with that i was able to draw 37 curves on the same axis. now i want to draw an average curve of these 37 curves on the same axis in such a way that all the curves (average and 37