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mata:
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`Factor' __factor_gtools(
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`Varlist' vars,
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`String' touse,
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`Boolean' verbose,
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`Boolean' sort_levels,
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`Boolean' count_levels,
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`Boolean' save_keys)
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{
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`Factor' F
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`Integer' num_vars, num_levels, num_obs
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`String' levels_var, tag_var, counts_var, cmd, if_cmd, counts_cmd
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`Vector' levels, counts, idx
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`Matrix' keys
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if (verbose == .) verbose = 0
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if (sort_levels == .) sort_levels = 1
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if (count_levels == .) count_levels = 1
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if (save_keys == .) save_keys = 1
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assert_msg(count_levels == 0 | count_levels == 1, "count_levels")
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assert_msg(save_keys == 0 | save_keys == 1, "save_keys")
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levels_var = st_tempname()
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counts_var = st_tempname()
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if_cmd = touse == "" ? "" : " if " + touse
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counts_cmd = count_levels ? sprintf("counts(%s) fill(data)", counts_var) : ""
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cmd = "gegen long %s = group(%s)%s, missing %s"
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cmd = sprintf(cmd, levels_var, invtokens(vars), if_cmd, counts_cmd)
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if (verbose) printf(cmd + "\n")
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stata(cmd)
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num_levels = st_numscalar("r(J)")
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num_obs = st_numscalar("r(N)")
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num_vars = cols(vars)
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levels = st_data(., levels_var, touse)
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if (count_levels) {
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counts = st_data( (1,num_levels) , counts_var, .)
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}
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if (save_keys) {
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idx = J(num_levels, 1, .)
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idx[levels] = 1::num_obs
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keys = st_data(idx, vars, touse)
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}
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if (count_levels) assert_msg(num_levels == rows(counts), "num_levels")
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assert_msg(num_obs == rows(levels), "num_obs")
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assert_msg(num_obs > 0, "no observations")
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assert_msg(num_vars > 0, "no variables")
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F = Factor()
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F.num_levels = num_levels
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F.num_obs = num_obs
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if (save_keys) swap(F.keys, keys)
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swap(F.levels, levels)
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swap(F.counts, counts)
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F.method = "gtools"
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assert_msg(rows(F.levels) == F.num_obs & cols(F.levels) == 1, "levels")
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if (save_keys==1) assert_msg(rows(F.keys) == F.num_levels, "keys")
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if (count_levels) assert_msg(rows(F.counts)==F.num_levels & cols(F.counts)==1, "counts")
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F.is_sorted = 0
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return(F)
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}
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end
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