search for: chromatogram

...chroms with R, which mimic my actual datasets, to play with, but after looking at the manuals of ALS, I'm affraid I can't get the job done. Can someone put me on the right way? Here is my code to generate the dummy chroms, which also plots the 2 chroms and the spectra of the 3 peaks: #2D chromatogram generation par(mfrow=c(3,1)) time <- seq(0,20,by=0.05) f <- function(x,rt) dnorm((x-rt),mean=0,sd=rt/35) c1 <- f(time,6.1) c2 <- f(time,5.6) c3 <- f(time,15) plot(c1+c2+c3~time,type="l",main="chrom1") #spectrum generation spectra <- function(x,a,b,c,d,e) a +...

I have two chromatograms I want plotted on the same axes. I would like the plots to be transparent, so the first chart is not obscured. I have tried adjustcolor(..., alpha.f=0.3), the problem is that my chromatogram is so dense with datapoints that they overlap and the entire graph just ends up a solid color. The second...

...ws are amounts of substances found in plant samples. Some substances are not present in some samples (=0). <o:p></o:p> <o:p> </o:p> The formula: Xi = (sum (from i=1 to n) (pi/Pi))/ n <o:p></o:p> <o:p> </o:p> *Xi* is a measure for the similarity of chromatograms with an ideal value of 1 (100 % similarity)*,n *is the number of peaks in both chromatograms to compare. xi is a measure for the similarity of the peaks in chromatograms.* **pi* is the integration (area) of the peak i (i=1 to n) of one chromatogram and *Pi,* the integration of the peak i (i=1 to n...

Hello! I am having an issue with the OrgMassSpecR package. I run my HPLC using a DAD detector. My raw data is exported form chemstation as a csv file. I then upload the csv into Rstudio no problem. Using the DrawChromatogram function, I get a nice chromatogram, and my retention time, peak area, and apex intensity values are given as well. The problem comes with the peak area value given. The peak area is much smaller than a value that would make sense. My peak area value is actually less than my apex intensity value....

I have 120 MS chromatograms containing two columns'Time' and 'Peak height'. how do in create a msSet file which is required by all the functions of 'msProcess' to process these files. I would appreciate help very much. Thanks Sharad -- View this message in context: http://r.789695.n4.nabble.com/msPro...

...0,6000), xlab = "DAX") points(interleave(EU$DAX, MIN = xi, MAX = xa, N = 130, channel = 2 ), EU$FTSE, col = "#EE000007", type = "h") Cheers, B. > On 2018-05-31, at 16:56, Ed Siefker <ebs15242 at gmail.com> wrote: > > I have two chromatograms I want plotted on the same axes. > I would like the plots to be transparent, so the first chart is > not obscured. > > I have tried adjustcolor(..., alpha.f=0.3), the problem is that > my chromatogram is so dense with datapoints that they > overlap and the entire graph just ends...

http://r.789695.n4.nabble.com/file/n3312061/x_and_y_values.txt x_and_y_values.txt I have the absorbance values form HPLC Chromatogram. I need to find the peaks in datapoints and area under each peak. I am not sure how how to find the peaks, I tried couple of libraries and peak function but they return me a list of values which when computed from area turns out to be huge nnumbers. In the dataset I know there are 4 peaks but i co...

I am pretty pleased with baselines I fit to chromatograms using the runquantile() function in caTools(v1.6) when its probs parameter is set to 0.2 and its k parameter to ~1/20th of n (e.g., k ~ 225 for n ~ 4500, where n is time series length). This ignores occasional low- side outliers, and, after baseline subtraction, I can re-adjust any negative val...

...weeks and every time I think I have the answer it still doesn't work. So I apologize in advance if this is painfully obvious, but I've run out of ideas and would really appreciate any input. My situation is this, I'm importing a number of tab delimited text files that contain chromatogram data that I am trying to display adjacent to a dendrogram. Since I look at multiple files I import them as file1, file2, file3, etc. To display them in the order that comes from the dendrogram I want to use order.dendrogram, which gives me a vector of numbers that is the order which I wan...

Hello all, I am trying to optimize my logistic regression model by using bootstrap. I was previously using SAS for this kind of tasks, but I am now switching to R. My data frame consists of 5 columns and has 109 rows. Each row is a single record composed of the following values: Subject_name, numeric1, numeric2, numeric3 and outcome (yes or no). All three numerics are used to predict