First take a look at your data and understand its structure.  What you have
is a named vector and not a matrix:

> str(x)
 Named num [1:213] 2.58 1.73 3.43 2.19 1.93 ...
 - attr(*, "names")= chr [1:213] "1799" "1800" "1801" "1802" ...
> x1 <- x[names(x) > '1820']
> x1
  1821   1822   1823   1824   1825   1826   1827   1828   1829   1830
1831   1832   1833   1834
1.4250 1.0990 1.0070 1.1795 1.3855 1.4065 1.1380 1.5140 1.4605 1.7560
1.4165 1.2200 1.8250 1.8365
  1835   1836   1837   1838   1839   1840   1841   1842   1843   1844
1845   1846   1847   1848
1.8100 1.8180 2.1085 2.2330 2.5605 2.2850 2.8210 2.1600 1.9140 1.7470
2.0310 1.8470 1.7715 1.7925
  1849   1850   1851   1852   1853   1854   1855   1856   1857   1858
1859   1860   1861   1862
1.6510 1.4345 1.2910 1.9895 1.9900 1.7300 1.9120 1.7760 1.5960 1.6915
1.8245 1.7730 2.1730 2.2345
  1863   1864   1865   1866   1867   1868   1869   1870   1871   1872
1873   1874   1875   1876

On Tue, Mar 12, 2013 at 1:50 PM, catalin roibu <catalinroibu@gmail.com>wrote:

> Hello all!
> I have a problem to extract values greater that for example 1820.
> I try this code: x[x[,1]>1820,]->x1
> Please help me!
>
> Thank you!
>
> The data structure is:
> structure(c(2.576, 1.728, 3.434, 2.187, 1.928, 1.886, 1.2425,
> 1.23, 1.075, 1.1785, 1.186, 1.165, 1.732, 1.517, 1.4095, 1.074,
> 1.618, 1.677, 1.845, 1.594, 1.6655, 1.1605, 1.425, 1.099, 1.007,
> 1.1795, 1.3855, 1.4065, 1.138, 1.514, 1.4605, 1.756, 1.4165,
> 1.22, 1.825, 1.8365, 1.81, 1.818, 2.1085, 2.233, 2.5605, 2.285,
> 2.821, 2.16, 1.914, 1.747, 2.031, 1.847, 1.7715, 1.7925, 1.651,
> 1.4345, 1.291, 1.9895, 1.99, 1.73, 1.912, 1.776, 1.596, 1.6915,
> 1.8245, 1.773, 2.173, 2.2345, 2.105, 1.922, 1.802, 1.6385, 1.6545,
> 2.1785, 1.868, 2.1855, 2.5175, 2.025, 2.435, 1.809, 1.628, 1.327,
> 1.3485, 1.4335, 2.052, 2.2465, 2.151, 1.7945, 1.79, 1.6055, 1.616,
> 1.633, 1.665, 2.002, 2.152, 1.736, 1.7985, 1.9155, 1.7135, 1.548,
> 1.568, 1.713, 2.079, 1.875, 2.12, 2.072, 1.906, 1.4645, 1.3025,
> 1.407, 1.5445, 1.437, 1.463, 1.5235, 1.609, 1.738, 1.478, 1.573,
> 1.0465, 1.429, 1.632, 1.814, 1.933, 1.63, 1.482, 1.466, 1.4025,
> 1.6055, 1.279, 1.827, 1.201, 1.425, 1.678, 1.5535, 1.599, 1.826,
> 1.964, 1.68, 1.492, 1.509, 1.666, 1.5665, 1.666, 1.4885, 1.8205,
> 1.5965, 1.84, 1.551, 1.4835, 1.805, 1.7145, 1.902, 1.2085, 0.9095,
> 0.9325, 1.34, 1.6135, 1.5825, 1.757, 1.7105, 1.3115, 1.288, 1.567,
> 1.7795, 1.642, 1.4375, 1.4495, 1.4225, 1.4885, 1.251, 1.179,
> 1.188, 1.3605, 1.373, 1.2185, 1.405, 1.016, 0.979, 1.018, 1.0335,
> 1.39, 1.3005, 1.3955, 1.301, 1.6475, 1.1945, 1.3215, 1.0535,
> 1.1645, 1.0895, 1.041, 1.155, 1.322, 1.1615, 0.933, 1.1215, 1.022,
> 0.922, 0.8465, 1.103, 1.1375, 1.23, 1.289, 1.222, 1.4865, 1.4025,
> 1.4295, 1.156, 0.9085, 0.8755, 0.9135, 0.982, 1.145, 1.1295,
> 1.3475, 1.2415, 1.2505), .Names = c("1799", "1800", "1801", "1802",
> "1803", "1804", "1805", "1806", "1807", "1808", "1809", "1810",
> "1811", "1812", "1813", "1814", "1815", "1816", "1817", "1818",
> "1819", "1820", "1821", "1822", "1823", "1824", "1825", "1826",
> "1827", "1828", "1829", "1830", "1831", "1832", "1833", "1834",
> "1835", "1836", "1837", "1838", "1839", "1840", "1841", "1842",
> "1843", "1844", "1845", "1846", "1847", "1848", "1849", "1850",
> "1851", "1852", "1853", "1854", "1855", "1856", "1857", "1858",
> "1859", "1860", "1861", "1862", "1863", "1864", "1865", "1866",
> "1867", "1868", "1869", "1870", "1871", "1872", "1873", "1874",
> "1875", "1876", "1877", "1878", "1879", "1880", "1881", "1882",
> "1883", "1884", "1885", "1886", "1887", "1888", "1889", "1890",
> "1891", "1892", "1893", "1894", "1895", "1896", "1897", "1898",
> "1899", "1900", "1901", "1902", "1903", "1904", "1905", "1906",
> "1907", "1908", "1909", "1910", "1911", "1912", "1913", "1914",
> "1915", "1916", "1917", "1918", "1919", "1920", "1921", "1922",
> "1923", "1924", "1925", "1926", "1927", "1928", "1929", "1930",
> "1931", "1932", "1933", "1934", "1935", "1936", "1937", "1938",
> "1939", "1940", "1941", "1942", "1943", "1944", "1945", "1946",
> "1947", "1948", "1949", "1950", "1951", "1952", "1953", "1954",
> "1955", "1956", "1957", "1958", "1959", "1960", "1961", "1962",
> "1963", "1964", "1965", "1966", "1967", "1968", "1969", "1970",
> "1971", "1972", "1973", "1974", "1975", "1976", "1977", "1978",
> "1979", "1980", "1981", "1982", "1983", "1984", "1985", "1986",
> "1987", "1988", "1989", "1990", "1991", "1992", "1993", "1994",
> "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002",
> "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010",
> "2011"))
>
>
> --
> ---
> Catalin-Constantin ROIBU
> Forestry engineer, PhD
> 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
>
>         [[alternative HTML version deleted]]
>
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

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