[R] Time series and correlation

Hi all, I have three columns. Resistance, Time and Frequency, and I need to find correlations between Resistance and Time by each of 100 Frequencies. I have set Frequencies to be a factor. Time is in the format "%m/%d/%Y %H:%M:%S", but correlations dont seem to like Time data. I can run this code

Re: [R] flag records

Lots of people here are touchy about homework and I can understand that. But sharing code and saying where you are stuck is a plus for me as compared to asking someone to do it all. So, without commenting on whether your shown code is right, assuming youhave a data.frame object sorted as describe

Re: [R] Convert one rectangle into two rectangles

Sounds like homework. We try not to do homework here (if it is). See the posting guide linked below for details. Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On

[R] Confusing fori or ifelse result in matrix manipulation

Hello, many thanks for your replies. The code I've posted was simplified and depicted my problem basically. Of course my intention was not to add 0-columns to a matrix, the problem resulted from my approach to add only eigenvectors to a matrix if the corresponding eigenvalue is element of rea

Re: [R] conversion of d m s (lat) d m s (long) coordinates into decimal coordinates

Hi Rui, I succeded to convert a coordinate from decimal to DMS formats but not the inverse!!! dd<- -52.55684 c<-dd2dms(dd, NS = FALSE) c [1] 52d33'24.624"W > The use of char2dms() function is not so easy because I cannot yet read() the text file with the DMS coordinates (one col. with the po