Hi, using latest git on Ubuntu 20.10, mread() using relative paths fails here. Here is a sample script: <hansl> clear set verbose off # Set according to your path string BASE_PATH = "/home/at/tmp" string DATA_NAME = "matrix.csv" print "Absolute path" string filename = sprintf("%s/mread_csv/%s", BASE_PATH, DATA_NAME) catch matrix m = mread(filename) if $error print "Failed to read matrix 'm'" else print m endif printf "\nUse relative path\n" set workdir "BASE_PATH" string filename = sprintf("./mread_csv/%s", DATA_NAME) catch matrix a = mread(filename) if $error print "Failed to read matrix 'a'" else print a endif # open command works using relative path open "@filename" summary quit </hansl> mread() works fine with an absolute path though. The "open" command handles relative paths without any problem. Best, Artur