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- _E_x_t_r_a_c_t _S_u_b_s_t_r_i_n_g_s _f_r_o_m _a _C_h_a_r_a_c_t_e_r _V_e_c_t_o_r
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- substr(x, start, stop)
- substring(text, first, last = 1000000)
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- _D_e_s_c_r_i_p_t_i_o_n:
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- substr takes a character vector as an argument and
- returns a vector whose elements contain the substring
- starting with the character at position start up to the
- character at position stop. If start is larger than the
- string length then NA is returned. If stop is longer
- than start and error is signalled.
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- substring is compatible with S. For vector arguments,
- it expands the arguments cyclically.
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- _S_e_e _A_l_s_o:
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- paste, nchar, strsplit
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- _E_x_a_m_p_l_e_s:
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- x <- c("asfef","qwerty","yuiop[","b","stuff.blah.yech")
- substr(x,3,5)
- substring(x,3,5)
- substring(x,3,3:5)
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