Hello! I've got troubles on following thing: As output I need a string like: INPUT_FILENAMES = H:\\AKK_temp\\Modis\\MOD13Q1\\austria\\MOD09Q1.A2008073.h18v04.005.2008083134952.hdf|H:\\AKK_temp\\Modis\\MOD13Q1\\austria\\MOD09Q1.A2008073.h19v04.005.2008082182221.hdf The filenames (dates) are with pathname (wrkdr) and separated with "|". The number of input filenames changes (minimum 1, maximum n) wrkdr <- "H:\\akk_temp\\Modis\\MOD09" dates is a data.frame where each row is a date and each column is a Modis-image (the name of it) I did this as following: paste('INPUT_FILENAMES = ', for(g in 1:(ntiles-1)) {paste(wrkdr,'\\',dates[i,g+1],'|',sep='')} , for(g in ntiles){ paste(wrkdr,'\\',dates[i,g+1],sep='') } ,sep='') ....and this did work (in an other "wrkdr" and other "dates") but after changing, "for" gave no more output. And I don't know why!!! Why i use "for" twice? Because after the last file there is no "|"... Thanks for help Matteo
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