Update a double precision column entry in a specified EK record. 

   EK 

   Variable  I/O  Description 
   --------  ---  -------------------------------------------------- 
   handle     I   Handle attached to EK file. 
   segno      I   Index of segment containing record. 
   recno      I   Record in which entry is to be updated. 
   column     I   Column name. 
   nvals      I   Number of values in new column entry. 
   dvals      I   Double precision values comprising new column entry. 
   isnull     I   Flag indicating whether column entry is null. 

   handle         is a file handle attached to an EK open for 
                  write access. 

   segno          is the index of the segment containing the column 
                  entry to be updated.  EK segment numbers range from
                  0 to N-1, where N is the number of segments
                  in the kernel.

   recno          is the index of the record containing the column 
                  entry to be updated.  This record number is 
                  relative to the start of the segment indicated by 
                  segno; the first record in the segment has index 0. 

   column         is the name of the column containing the entry to 
                  be updated. 

   nvals, 
   dvals          are, respectively, the number of values to insert into 
                  the specified column and the set of values 
                  themselves.  The data values are written in to the 
                  specifed column and record. 

                  If the  column has fixed-size entries, then nvals 
                  must equal the entry size for the specified column. 

                  For columns with variable-sized entries, the size 
                  of the new entry need not match the size of the 
                  entry it replaces.  In particular, the new entry 
                  may be larger. 

   isnull         is a logical flag indicating whether the entry is 
                  null.  If isnull is SPICEFALSE, the column entry 
                  defined by nvals and dvals is added to the 
                  specified kernel file. 

                  If isnull is SPICETRUE, nvals and ivals are ignored.
                  The column entry is marked as a null value. 
                  The contents of the column entry are undefined. 
                  If the column has fixed-length, variable-size 
                  entries, the number of entries is considered to 
                  be 1. 

                  The new entry may be null even though it replaces 
                  a non-null value, and vice versa. 

   None.  See $Particulars for a description of the effect of this 
   routine. 

   None. 

   This routine operates by side effects:  it modifies the named 
   EK file by adding data to the specified record in the specified 
   column.  Data may be added to a segment in random order; it is not 
   necessary to fill in columns or rows sequentially. Data may only 
   be added one logical element at a time.  Partial assignments of 
   logical elements are not supported. 

   Since columns of data type TIME are implemented using double 
   precision column classes, this routine may be used to update 
   columns of type TIME. 

   1)  Replace the value in the third record of the column DCOL in 
       the fifth segment of an EK file designated by HANDLE.  Set 
       the new value to 999.. 

          #include <SpiceUsr.h>
              .
              .
              .
          ekuced_c ( handle, 4, 2, "DCOL", 1, 999.0, SPICEFALSE ); 


   2)  Same as (1), but this time add a null value.  The argument 
       999. is ignored because the null flag is set to SPICETRUE 

          #include <SpiceUsr.h>
              .
              .
              .
          ekuced_c ( handle, 4, 2, "DCOL", 1, 999.0, SPICETRUE ); 


   3)  Replace the entry in the third record of the column DARRAY in 
       the fifth segment of an EK file designated by HANDLE.  Set 
       the new value using an array DBUFF of 10 d.p. values. 

          #include <SpiceUsr.h>
              .
              .
              .
           ekuced_c ( handle, 4, 2, "DARRAY", 10, dbuff, SPICEFALSE );

   None. 

   1)  If handle is invalid, the error will be diagnosed by routines 
       called by this routine. 

   2)  If segno is out of range, the error will diagnosed by routines 
       called by this routine. 

   3)  If column is not the name of a declared column, the error 
       will be diagnosed by routines called by this routine. 

   4)  If column specifies a column of whose data type is not 
       double precision, the error SPICE(WRONGDATATYPE) will be 
       signaled. 

   5)  If recno is out of range, the error will diagnosed by routines 
       called by this routine. 

   6)  If the specified column has fixed-size entries and nvals 
       does not match this size, the error will diagnosed by routines 
       called by this routine. 

   7)  If the specified column has variable-size entries and nvals 
       is non-positive, the error will diagnosed by routines 
       called by this routine. 

   8)  If an attempt is made to add a null value to a column that 
       doesn't take null values, the error will diagnosed by routines 
       called by this routine. 

   9)  If COLUMN specifies a column of whose class is not 
       a double precision class known to this routine, the error 
       SPICE(NOCLASS) will be signaled. 

   10) If an I/O error occurs while reading or writing the indicated 
       file, the error will be diagnosed by routines called by this 
       routine. 

   11) If the input column name string pointer is null, the error
       SPICE(NULLPOINTER) will be signaled.

   12) If the input column name string has length zero, the error
       SPICE(EMPTYSTRING) will be signaled.

   See the EK Required Reading for a discussion of the EK file 
   format. 

   N.J. Bachman   (JPL) 

   None. 

   -CSPICE Version 1.0.0, 28-AUG-2001 (NJB)

   replace d.p. entry in an EK column 
   replace time entry in an EK column