is.multiple             package:PROcess             R Documentation

_F_i_n_d _m_u_l_t_i_p_l_e-_c_h_a_r_g_e_d _p_o_l_y_p_e_p_t_i_d_e_s.

_D_e_s_c_r_i_p_t_i_o_n:

     For each of the polypeptides in a vector, find its
     multiple-charged species in the vector.

_U_s_a_g_e:

     is.multiple(v, k = 2, eps = 0.003)

_A_r_g_u_m_e_n_t_s:

       v: a vector of polypeptides.

       k: a vector of integers, that is, multiples of interest.

     eps: a user specified precision of peak position.

_D_e_t_a_i_l_s:

     If abs(v-k*u)/v <= eps, then v is considered to be u with k
     charges.

_V_a_l_u_e:

     A list named with the m/z values of polypeptides who have
     multiple-charged species; each component is a named vector of
     polypeptides with number of charges as names.

_E_x_a_m_p_l_e_s:

     bmks <- c(2360.25, 2666.34, 3055.72, 3058.04, 
     3776.94, 3778.24, 3779.53, 4712.37,7559.76, 4587.03, 
     4589.88, 9155.59, 13298.7)
     is.multiple(bmks, k=2:5)

