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orderd_c

 Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input Detailed_Output Parameters Exceptions Files Particulars Examples Restrictions Literature_References Author_and_Institution Version Index_Entries

#### Procedure

```   orderd_c ( Order of a double precision array )

void orderd_c ( ConstSpiceDouble  * array,
SpiceInt            ndim,
SpiceInt          * iorder )

```

#### Abstract

```   Determine the order of elements in a double precision array.
```

```   None.
```

#### Keywords

```   ARRAY
SORT

```

#### Brief_I/O

```   VARIABLE  I/O  DESCRIPTION
--------  ---  --------------------------------------------------
array      I   Input array.
ndim       I   Dimension of array.
iorder     O   Order vector for array.
```

#### Detailed_Input

```   array       is the input array.

ndim        is the number of elements in the input array.
```

#### Detailed_Output

```   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.

The elements of iorder range from zero to ndim-1.
```

#### Parameters

```   None.
```

#### Exceptions

```   Error free.

1)  A negative input dimension causes this routine to leave the
output order vector unchanged.
```

#### Files

```   None.
```

#### Particulars

```   orderd_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 orderd_c may be used by any of
the reord* routines to sort sets of related arrays, as shown
in the example below.
```

#### Examples

```   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 visual magnitude.
./

orderd_c ( vmags,  n,  iorder );

reordc_c ( iorder, n, namlen, names  );
reordd_c ( iorder, n,         masses );
reordi_c ( iorder, n,         codes  );
reordd_c ( iorder, n,         vmags  );
```

#### Restrictions

```   None.
```

#### Literature_References

```   None.
```

#### Author_and_Institution

```   N.J. Bachman        (JPL)
J. Diaz del Rio     (ODC Space)
I.M. Underwood      (JPL)
```

#### Version

```   -CSPICE Version 1.0.2, 04-JUL-2021 (JDR)

Edited the header to comply with NAIF standard.

-CSPICE Version 1.0.1, 23-MAR-2010 (NJB)

Header example was updated to show use of this routine.
-Exceptions section was updated. Header sections were
re-ordered.

-CSPICE Version 1.0.0, 08-JUL-2002 (NJB) (IMU)
```

#### Index_Entries

```   order of a d.p. array
```
`Fri Dec 31 18:41:10 2021`