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: http://www.stsci.edu/~sontag/spicedocs/cspice/valid_c.html
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Create a valid CSPICE set from a CSPICE Cell of any data type.
SETS
VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- size I Size (maximum cardinality) of the set. n I Initial no. of (possibly non-distinct) elements. set I/O Set to be validated.
size is the maximum cardinality (number of elements) of the set. size must not exceed the declared size of the set's data array. n is the number of (possibly non-distinct) elements initially contained in the set's data array. N cannot be greater than the size of the set. set is a CSPICE set. set must be declared as a character, double precision, or integer SpiceCell. On input, set contains n elements.
set on output is a valid set created from the input set. To create a valid set, the elements are ordered, and duplicate elements are removed. The set's size and cardinality members are assigned their correct values. The set is ready for use with other set routines. When validating a character set, trailing blanks are not considered significant in process of sorting and removing duplicates. Trailing blanks are not preserved on output.
None.
Because a set is ordered and contains distinct values, to create a set from a cell, it is necessary to sort the data array and remove duplicates. Once the array has been sorted, duplicate elements (adjacent after sorting) are removed. The size and cardinality of the set are initialized, and the set is ready to go. This routine is typically used to create a CSPICE set from a CSPICE cell whose array which has been initialized via calls the appnd*_c routines, or through compile-time array initializers, or I/O statements. The resulting set can then be used with the other set routines. When a set is constructed from a large set of unordered values, it is far more efficient to append the values to the set and then validate the set, than to build up the set via calls to the insrt*_c routines. The latter sort the set and remove duplicates on each insertion. Because validation is done in place, there is no chance of overflow.
1) Build a double precision cell via a series of calls to appndd_c. Create a set from this set by calling valid_c. #include "SpiceUsr.h" int main() { /. Declare the set. SETSIZ is the maximum capacity of the set. ./ #define SETSIZ 1000000 SPICEDOUBLE_CELL ( dpSet, SETSIZ ); /. INISIZ will be the initial number of elements in the set. ./ #define INISIZ 100000 /. Other local variables: ./ SpiceInt i; /. Initialize the cell's data array. We use bogus values to simplify the example. ./ for ( i = 0; i < INISIZ; i++ ) { appndd_c ( (SpiceDouble)(-i), &dpset ); } /. Validate the set. The elements of the set will be arranged in increasing order after this call. ./ valid_c ( SETSIZ, INISIZ, &dpSet ); return ( 0 ); }
None. Literature_References 1) String comparisons performed by this routine are Fortran-style: trailing blanks in the input sets 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 size of the set is too small to hold the set BEFORE validation, the error SPICE(INVALIDSIZE) is signaled. The set is not modified.
None.
N.J. Bachman (JPL) C.A. Curzon (JPL) W.L. Taber (JPL) I.M. Underwood (JPL)
-CSPICE Version 1.0.0, 08-AUG-2002 (NJB) (CAC) (WLT) (IMU)
validate a set