I would like to know how to convert a list like (actual elements may be more) [-#-#--, #-----, -#--#-, ---###] Convert according to certain rules, # convert to true, - convert to false, the result is { { true, false, true, false, true }, { false, true, false, true, false }, { true, true, true, true, true }, { false, true, false, true, false }, { true, false, true, false, true }} thanks for help