cspice_spkw08 |
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## AbstractCSPICE_SPKW08 writes a type 8 segment to an SPK file. ## I/OGiven: handle the file handle of an SPK file open for writing. [1,1] = size(handle); int32 = class(handle) body the SPICE ID code for an ephemeris object whose state relative to another body is described by the segment to be created. [1,1] = size(body); int32 = class(body) center the SPICE ID code for the center of motion of the object identified by body. [1,1] = size(center); int32 = class(center) frame the name for a reference frame relative to which the state information for body is specified. [1,c1] = size(fname); char = class(fname) or [1,1] = size(fname); cell = class(fname) first, last are, respectively, the start and stop times of the time interval over which the segment defines the state of body. [1,1] = size(first); double = class(first) [1,1] = size(last); double = class(last) segid is the segment identifier. An SPK segment identifier may contain up to 40 characters. degree the degree of the Lagrange polynomials used to interpolate the states. All components of the state vectors are interpolated by polynomials of fixed degree. [1,1] = size(degree); int32 = class(degree) states contains a time-ordered array of geometric states ( x, y, z, dx/dt, dy/dt, dz/dt, in kilometers and kilometers per second ) of body relative to center, specified relative to frame. [6,m] = size(states); double = class(states) epoch1 the epoch corresponding to the first state in the state array. Because extra states are needed at the beginning and end of the segment in order for the interpolation method to work, epoch1 will normally precede first. [1,1] = size(epoch1); double = class(epoch1) step the time step separating the epochs of adjacent states in the input state array. step is specified in TDB seconds. [1,1] = size(step); double = class(step) the call: ## ExamplesAny 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. Example: % % Define the segment identifier parameters. % BODY = 3; CENTER = 10; REF = 'J2000'; POLY_DEG = 3; SPK8 = 'test8.bsp'; N_DISCRETE = 9; % % A set of epochs. % DISCRETEEPOCHS = (1:9)*100; % % An array of discrete states to write to the SPK segment. % base = [ (1:6)*100 ]'; % % Create the 6xN array of states. % DISCRETESTATES = [(base+1), (base+2), (base+3), ... (base+4), (base+5), (base+6), ... (base+7), (base+8), (base+9) ]; % % Create a segment identifier. % segid = 'SPK type 8 test segment'; % % Open a new SPK file. Delete if a file of the same name exists. % if ( exist( SPK8, 'file' ) == 2 ) delete( SPK8 ) end handle = cspice_spkopn( SPK8, segid, 4 ); step = DISCRETEEPOCHS(2) - DISCRETEEPOCHS(1); % % Create a type 8 segment. % ## ParticularsNone. ## Required ReadingFor important details concerning this module's function, please refer to the CSPICE routine spkw08_c. ## Version-Mice Version 1.0.0, 23-MAY-2012, EDW (JPL) ## Index_Entrieswrite spk type_8 ephemeris data segment |

Wed Apr 5 18:00:35 2017