Hi everybody,

If I've a data frame like this:

dataframe a

      X0  X2  X4  X6  X8 X10 X12 X14 X16
1957   0   0   0   0   0   0   0   0   0
1958   0   0   0   0   0   0   0   0   0
1959 831   0   0   0   0   0   0   0   0
1960 544 282   0   0   0   0   0   0   0
1961 446 365   0   0   0   0   0   0   0
1962 442 473   0   0   0   0   0   0   0
1963 595 468   0   0   0   0   0   0   0
1964 400 397 516   0   0   0   0   0   0
1965 417 382 401   0   0   0   0   0   0
1966 642 518 509 453   0   0   0   0   0
1967 505 340 621 458   0   0   0   0   0
1968 451 383 428 318 339   0   0   0   0

> length (a)
[1] 9

I've a questions...

There is a function for show the lenght of single observation?

> ???? (a)
[1] 12



Best Wishes,

Alfredo

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