is_string.i4.v = is_interpolated_common_transform_c(common_index.i4.v)

	This routine determines if a common transform uses an
	interpolation table to perform the scaling.

	common_index	common transform index

	This function returns status values as follows:

	TRUE			uses an interpolation table
	FALSE			doesn't use an interpolation table

	This function requires the following include files:

	clib_h, cnsparam_h

	Related functions:

	read_scaling_interpolation_table_c, is_linear_common_transform_c,
	is_unscalable_primary_transform_c, is_string_common_transform_c,
	common_transform_num_const_c, pdudpu, pdudpu_ext, pdudcu, pdudcu_ext,
	pdpucu, pdpucu_ext, pdpucu8, pdcupu, pdcupu_ext, pdcupu8,
	pdcuud, pdcuud8, pcpuud, pdimax, pdulen, pdb_valid_length_c,

	C/C++ usage:

	int	is_interpolated;
	int	common_index = 20;

	is_interpolated = is_interpolated_common_transform_c(common_index);