cdm/src/main/java/ucar/ma2/StructureData.java
public StructureData getScalarStructure(String memberName) {
    StructureMembers.Member m = findMember(memberName);
    if (null == m) throw new IllegalArgumentException("Member not found= " + memberName);
    return getScalarStructure(m);
  }
public StructureData getScalarStructure(String memberName) {
    StructureMembers.Member m = findMember(memberName);
    if (null == m) throw new IllegalArgumentException("Member not found= " + memberName);
    return getScalarStructure(m);
  }
Get member data of type Structure.
@param memberName name of member Variable.
@return scalar StructureData value
@throws IllegalArgumentException if name is not legal member name.