Hello all!
I have a big problem now. I want a data frame like this:
dput(head(test,100))
structure(c(NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, "medium",
"medium", "medium", "medium", "medium", "medium", "medium", NA,
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NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, "medium",
"medium", "major", "major", "major", "major", "medium", NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
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NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, "medium", NA, "medium", "medium", NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, "medium",
"medium", "medium", "medium", NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA), .Dim = c(100L, 30L), .Dimnames =
list(
    c("1592", "1593", "1594", "1595", "1596", "1597", "1598",
    "1599", "1600", "1601", "1602", "1603", "1604", "1605", "1606",
    "1607", "1608", "1609", "1610", "1611", "1612", "1613", "1614",
    "1615", "1616", "1617", "1618", "1619", "1620", "1621", "1622",
    "1623", "1624", "1625", "1626", "1627", "1628", "1629", "1630",
    "1631", "1632", "1633", "1634", "1635", "1636", "1637", "1638",
    "1639", "1640", "1641", "1642", "1643", "1644", "1645", "1646",
    "1647", "1648", "1649", "1650", "1651", "1652", "1653", "1654",
    "1655", "1656", "1657", "1658", "1659", "1660", "1661", "1662",
    "1663", "1664", "1665", "1666", "1667", "1668", "1669", "1670",
    "1671", "1672", "1673", "1674", "1675", "1676", "1677", "1678",
    "1679", "1680", "1681", "1682", "1683", "1684", "1685", "1686",
    "1687", "1688", "1689", "1690", "1691"), c("01", "02", "03",
    "04", "05", "06", "07", "08", "09-236", "10-63T", "11", "12",
    "13", "14", "15", "16", "17-234", "18", "19", "20", "23",
    "24", "25", "26", "27", "HAR133", "HAR105", "HAR211", "HUMH255",
    "HUMH276")))
Now I want to group rownames (in this case year) in 10 years classes and I
want to count for each 10 years classe (decade) the number of major and
minor events.
I try this code to group values in classes but don't work and I don't know
how to count a  value for each row and sum them for each 10 years classes.

test$year<-as.numeric(row.names(test))
q<-cut(rownames(test),seq(0,ceiling(max(rownames(test)+10),by=10),
labels=seq(10,ceiling(max(rownames(test)+10), by=10))))

Please help me to solve this problem!

Thank very much!

-- 
---
Catalin-Constantin ROIBU
Lecturer PhD, Forestry engineer
Forestry Faculty of Suceava
Str. Universitatii no. 13, Suceava, 720229, Romania
office phone     +4 0230 52 29 78, ext. 531
mobile phone   +4 0745 53 18 01
                       +4 0766 71 76 58
FAX:                +4 0230 52 16 64
silvic.usv.ro

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