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====== Joining strings in an input file ====== You can concatanate strings in a text file to build up complex filenames etc using the following: macro data_directory {c:\data\storage_directory\} macro file_stem {dataname_} macro run_number {0000} macro suffix {.xy} macro file_dets(data_directory, file_stem, run_number, suffix) { data_directory##file_stem##run_number##suffix } macro file { file_dets(data_directory, file_stem, run_number, suffix) } file which will expand to: c:\data\storage_directory\dataname_0000.xy The ## concatenation sequence is a c pre-processor construct and only concatenates macro arguments hence the double step. Similarly you can e.g. change the name of an output .xy file with macros like: macro lor { 1000 } macro File_Out_(n) { voigt##n##.xy } Out_X_Ycalc(File_Out_(lor))