I want to write gnuplot command for a file which just I have one column of that. In the file and that column is Y, But in the file I don't have X's column.X's column element are

1

2

3

4

5

6

7

.Pay attention to the belowe think they are my in file witch they
"

12

43

65

76

12

56

"
As you see I have Y's element but I do not have X's element in my file,I mean X elemat is based on the row number.I guess there should be an command in gnuplot which does this.