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Determine the order of elements in an array of character strings.
None.
VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- lenvals I String length. array I Input array. ndim I Dimension of array. iorder O Order vector for array.
lenvals is the declared length of the strings in the input string array, including null terminators. The input array should be declared with dimension [ndim][lenvals] array is the input array. ndim is the number of elements in the input array.
iorder is the order vector for the input array. iorder[0] is the index of the smallest element of array; iorder[1] is the index of the next smallest; and so on. Strings are ordered according to the ASCII collating sequence. Trailing white space is ignored when comparing strings. The elements of iorder range from zero to ndim-1.
None.
orderc_c finds the index of the smallest element of the input array. This becomes the first element of the order vector. The process is repeated for the rest of the elements. The order vector returned by orderc_c may be used by any of the reord* routines to sort sets of related arrays, as shown in the example below.
In the following example, the order and reord routines are used to sort four related arrays (containing the names, masses, integer ID codes, and visual magnitudes for a group of satellites). This is representative of the typical use of these routines. #include "SpiceUsr.h" . . . /. Sort the object arrays by name. ./ orderc_c ( namlen, names, n, iorder ); reordc_c ( iorder, n, namlen, names ); reordd_c ( iorder, n, masses ); reordi_c ( iorder, n, codes ); reordd_c ( iorder, n, vmags );
1) String comparisons performed by this routine are Fortran-style: trailing blanks in the input array or key value are ignored. This gives consistent behavior with CSPICE code generated by the f2c translator, as well as with the Fortran SPICE Toolkit. Note that this behavior is not identical to that of the ANSI C library functions strcmp and strncmp.
1) If the input string pointer is null, the error SPICE(NULLPOINTER) will be signaled. 2) If the input array string's length is less than 2, the error SPICE(STRINGTOOSHORT) will be signaled. 3) If ndim < 1, this routine returns immediately. This case is not considered an error.
None.
N.J. Bachman (JPL) I.M. Underwood (JPL)
None.
-CSPICE Version 1.0.0, 18-JUL-2002 (NJB) (IMU)
order of a character array