Table of contents
CSPICE_GDPOOL returns the value of a double precision kernel
variable (scalar or array) from the kernel pool.
Given:
name the scalar string name of a pool variable associated to double
precision values.
help, name
STRING = Scalar
start a scalar integer value for the index indicating the first
component of the data vector assigned to `name' for return
(index 0 for all elements).
help, start
LONG = Scalar
room the scalar integer specifying the maximum number of components
that can return for `name'.
help, room
LONG = Scalar
the call:
cspice_gdpool, name, start, room, values, found
returns:
values a double precision array of the values copied from the kernel
pool data assigned to `name' beginning at index `start'.
help, values
DOUBLE = Array[N]
found a scalar boolean that flags whether `name' exists in the kernel
pool and has double precision type.
help, found
BOOLEAN = Scalar
`values' has a size of `room' or less.
None.
Any numerical results shown for this example may differ between
platforms as the results depend on the SPICE kernels used as input
and the machine specific arithmetic implementation.
1) The following code example demonstrates how the data stored
in a kernel pool variable can be retrieved in pieces.
Use the kernel shown below to load the kernel pool with the
variables used within the example.
KPL/MK
File name: gdpool_ex1.tm
This kernel is intended to support operation of SPICE
example programs.
\begindata
CTEST_VAL = ('LARRY', 'MOE', 'CURLY' )
ITEST_VAL = ( 3141, 186, 282 )
DTEST_VAL = ( 3.1415, 186. , 282.397 )
\begintext
End of meta-kernel
Example code begins here.
PRO gdpool_ex1
;;
;; Load the test data.
;;
cspice_furnsh, 'gdpool_ex1.tm'
;;
;; Retrieve up-to 'ROOM' character entries for
;; kernel pool variable named 'DTEST_VAL' to
;; the array named 'cvals'. The first index to return,
;; 'START', has value 0 (this returns all components).
;;
VAR = 'DTEST_VAL'
ROOM = 25
START = 0
cspice_gdpool, VAR, START, ROOM, values, found
if (found) then begin
print, 'Found ' + VAR + ' in the kernel pool'
for i=0, n_elements(values)-1 do begin
print, ' Element ' + string(i) + ' of ' + VAR + $
': ', values[i]
endfor
endif else begin
print, 'Failed to find ' + VAR + ' in the kernel pool'
endelse
;;
;; It's always good form to unload kernels after use,
;; particularly in IDL due to data persistence.
;;
cspice_kclear
END
When this program was executed on a Mac/Intel/IDL8.x/64-bit
platform, the output was:
Found DTEST_VAL in the kernel pool
Element 0 of DTEST_VAL: 3.1415000
Element 1 of DTEST_VAL: 186.00000
Element 2 of DTEST_VAL: 282.39700
This routine provides the user interface to retrieving
numeric data stored in the kernel pool. This interface
allows you to retrieve the data associated with a variable
in multiple accesses. Under some circumstances this alleviates
the problem of having to know in advance the maximum amount
of space needed to accommodate all kernel variables.
However, this method of access does come with a price. It is
always more efficient to retrieve all of the data associated
with a kernel pool data in one call than it is to retrieve
it in sections.
See also the routines cspice_gipool and cspice_gcpool.
1) If the value of `room' is less than one, the error
SPICE(BADARRAYSIZE) is signaled by a routine in the call tree
of this routine.
2) If any of the input arguments, `name', `start' or `room', is
undefined, an error is signaled by the IDL error handling
system.
3) If any of the input arguments, `name', `start' or `room', is
not of the expected type, or it does not have the expected
dimensions and size, an error is signaled by the Icy
interface.
4) If any of the output arguments, `values' or `found', is not a
named variable, an error is signaled by the Icy interface.
None.
None.
ICY.REQ
KERNEL.REQ
None.
J. Diaz del Rio (ODC Space)
E.D. Wright (JPL)
-Icy Version 1.0.3, 25-AUG-2021 (JDR)
Edited the header to comply with NAIF standard. Added
example's meta-kernel and problem statement. Modified example
to use "cspice_kclear".
Added -Parameters, -Particulars, -Exceptions, -Files, -Restrictions,
-Literature_References and -Author_and_Institution sections.
Removed reference to the routine's corresponding CSPICE header from
-Abstract section.
Added arguments' type and size information in the -I/O section.
-Icy Version 1.0.2, 26-AUG-2016 (EDW) (JDR)
Edit to example code. Typos in kernel names; "pool_t.ker"
and "pool_t.pro" rather than "pool_t.tm."
-Icy Version 1.0.1, 03-JAN-2007 (EDW)
Edit to -I/O section for 'room' and 'start' to improve clarity.
-Icy Version 1.0.0, 16-JUN-2003 (EDW)
RETURN the d.p. value of a pooled kernel variable
RETURN the numeric value of a pooled kernel variable
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