11.4 ANATOMY OF AN EXTERNAL FUNCTION
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Getting example/development code
The ~_init subroutine (required)
The ~_compute subroutine (required)
The ~_work_size subroutine (required when work arrays are defined)
The ~_result_limits subroutine (required if result has a custom or abstract axis)
The ~_custom_axes subroutine (required if result has a custom axis)
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ef_set_axis_inheritance(id, Xsrc, Ysrc, Zsrc, Tsrc)
ef_set_piecemeal_ok(id, Xyn, Yyn, Zyn, Tyn)
ef_set_arg_name(id, arg, name)
ef_set_arg_desc(id, arg, desc)
ef_set_arg_unit(id, arg, unit)
ef_set_arg_type(id, arg, type)
ef_set_axis_extend(id, arg, axis, lo_amt, hi_amt)
ef_set_axis_influence(id, arg, Xyn, Yyn, Zyn, Tyn)
ef_set_axis_reduction(id, Xred, Yred, Zred, Tred)
ef_set_axis_limits(id, axis, lo, hi)
ef_set_custom_axis(id, axis, lo, hi, delta, unit, modulo)
ef_set_num_work_arrays(id, nwork)
ef_set_work_array_dims(id, iarray, xlo, ylo, zlo, tlo, xhi, yhi, zhi, thi)
ef_get_res_subscripts(id, res_lo_ss, res_hi_ss, res_incr)
ef_get_arg_info(id, iarg, arg_name, arg_title, arg_units)
ef_get_arg_string(id, iarg, text)
ef_get_one_arg_string(id, iarg, text)
ef_get_axis_info(id, iarg, axname, ax_units, backward, modulo, regular)
ef_get_axis_dates(id, iarg, taxis, numtimes, precision, datebuf)
ef_get_axis_calendar(id, iarg, calname, yrdays, nmonths, days_in_month)
ef_get_arg_subscripts(id, arg_lo_ss, arg_hi_ss, arg_incr)
ef_get_arg_ss_extremes(id, num_args, ss_min, ss_max)
ef_get_bad_flags(id, bad_flag, bad_flag_result)
ef_get_coordinates(id, arg, axis, lo, hi, coords)
ef_get_box_size(id, arg, axis, lo, hi, size)
ef_get_box_limits(id, arg, axis, lo, hi, lo_lims, hi_lims)
ef_get_one_val(id, arg, value)
ef_get_string_arg_element(id, arg, i,j,k,l, str_arg, slen, text)
ef_get_string_arg_element_len (id, arg, str_arg, i,j,k,l, slen)
ef_get_string_arg_max_len (id, arg, str_arg, slen)
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