Write the data element of a linear predictor
paste_data(matnam, index, col, isgk = FALSE)A vector of character strings of the form
M_id[i, 3] or M_id[i, 3, k].
characters string; name of the data matrix
character string; the index (e.g., "i", or "ii")
integer vector; the indices of the columns in matnam
logical; is this for within the Gauss-Kronrod quadrature?