Thank you very much for your help, you have been excused to have a suspicion, but dont worry i am not cheating, it is not a home work, rather it is a pre-project task that i have to deal with in order to prepare to my project, and i cant understand this programming things alone, i tried my best but still i cant deal with it properly, i am studying master and PhD in bioinformatics, and i need to develop a good understanding of programming languages. still a beginner but i start to have some fears ... what ever you send me, i study it and know exactly how it works, and believe me that can help a lot to develop my skills. Moreover i am dealing with it in a very honesty way that does not break any academic regulations.
thanks again i will try what you sent me .. Yours che wrote: > > hello every one, > > How to function more than one loop in R? I have the following problem to > be solved with the a method of three loops, can you help me please? > > The data is attached with this message. > > The data is composed of two parts, cleaved (denoted by “cleaved”) and non > cleaved (denoted by “noncleaved”). > • to access to the ith peptide, you can use X$Peptide[i] > • to access to the ith label, you can use X$Label[i] > > define a set of amino acids using string or other format if you want > amino.acid<-"ACDEFGHIKLMNPQRSTVWY" > define two matrices with initialised entries, one for cleaved peptides > and one for none-cleaved peptides > • matrix(0,AA,mer),where AA is the number of amino acids, and mer is the > number > of residues detected from data using the nchar function > • both matrices have the same size, the number of rows being equal to the > number > of amino acids and the number of columns being equal to the number of > residues > in peptides > > > use one three-loop structure to detect the frequency of amino acids in > cleaved peptides > and one three-loop structure to detect the frequency of amino acids in > non-cleaved > peptides. They should not be mixed in one three-loop structure. The best > way to > handle this is to use a function. The three-loop structure is exampled as > below > for(i in 1:num)#scanning data for all peptides, where num means the number > of peptides > { > for(j in 1:mer)#scanning all residues in a peptide > { > for(k in 1:AA)#scanning 20 amino acids > { > #actions > } > } > } > http://n4.nabble.com/file/n1015851/hiv.dat hiv.dat > -- View this message in context: http://n4.nabble.com/More-than-on-loop-tp1015851p1015863.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.