User:Hyp cos/Dimensional Array Notation

Dimensional array notation (DAN) is the 4th part of R function.

Up to a flatten brace
Now I bring you a new thing - {0,,1} - called a flatten brace. The double comma here is a separator string. Actually, in R function only separator string can separate entries, but separator itself cannot. Notice that a separator string can contain only 1 separator, such as the normal comma separator string.

When {0,,1} appears in an array that doesn't contain double-comma separator strings, it will be flatten into a string: 0,1,1,...,1,1 with a 0 and n 1's, where n is the base number.