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CLASS ndi.element.timeseries

NDI_ELEMENT - define or examine a element in the session

Documentation for ndi.element.timeseries
   doc ndi.element.timeseries

Superclasses

ndi.element, ndi.ido, ndi.epoch.epochset, ndi.documentservice, ndi.time.timeseries

Properties

Property Description
session
name
type
reference
underlying_element
direct
subject_id
dependencies
identifier

Methods

Method Description
addepoch add an epoch to the ndi.element
buildepochgraph compute the epochgraph among epochs for an ndi.epoch.epochset object
buildepochtable build the epoch table for an ndi.element
cached_epochgraph return the cached epoch graph of an ndi.epoch.epochset object
cached_epochtable return the cached epochtable of an ndi.epoch.epochset object
doc_unique_id return the document unique reference for an ndi.element object
elementstring Produce a human-readable element string
epoch2str convert an epoch number or id to a string
epochclock return the ndi.time.clocktype objects for an epoch
epochgraph graph of the mapping and cost of converting time among epochs
epochid Get the epoch identifier for a particular epoch
epochnodes return all epoch nodes from an ndi.epoch.epochset object
epochsetname the name of the ndi.element object, for EPOCHNODES
epochtable Return an epoch table that relates the current object's epochs to underlying epochs
epochtableentry return the entry of the EPOCHTABLE that corresonds to an EPOCHID
getcache return the NDI_CACHE and key for ndi.element
id return the document unique identifier for an ndi.element object
issyncgraphroot should this object be a root in an ndi.time.syncgraph epoch graph?
load_all_element_docs load all of the ndi.element objects from an session database
load_element_doc load a element doc from the session database
loadaddedepochs load the added epochs from an ndi.element
matchedepochtable compare a hash number from an epochtable to the current version
ndi_unique_id Generate a unique ID number for NDI projects
newdocument need docs here
numepochs Number of epochs of ndi.epoch.epochset
readtimeseries read the ndi.element.timeseries data from a probe based on specified time relative to an NDI_TIMEFERENCE or epoch
resetepochtable clear an ndi.epoch.epochset epochtable in memory and force it to be re-read from disk
samplerate return the sample rate of an ndi.time.timeseries object
samples2times convert from the timeseries time to sample numbers
searchquery need docs here
t0_t1
times2samples convert from the timeseries time to sample numbers
timeseries define or examine a element in the session
underlyingepochnodes find all the underlying epochnodes of a given epochnode

Methods help

addepoch - add an epoch to the ndi.element

[NDI_ELEMENT_OBJ, EPOCHDOC] = ADDEPOCH(NDI_ELEMENT_TIMESERIES_OBJ, EPOCHID, EPOCHCLOCK, T0_T1, TIMEPOINTS, DATAPOINTS)

Registers the data for an epoch with the NDI_ELEMENT_OBJ.

Inputs: NDI_ELEMENT_OBJ: The ndi.element object to modify EPOCHID: The name of the epoch to add; should match the name of an epoch from the probe EPOCHCLOCK: The epoch clock; must be a single clock type that matches one of the clock types of the probe T0_T1: The starting time and ending time of the existence of information about the ELEMENT on the probe, in units of the epock clock TIMEPOINTS: the time points to be added to this epoch; can also be the string 'probe' which means the points are read directly from the probe (must be Tx1). Timepoints must be in the units of the EPOCHCLOCK. DATAPOINTS: the data points that accompany each timepoint (must be TxXxY...), or can be 'probe' to read from the probe Outputs: If a second output is requested in EPOCHDOC, then the DOC is NOT added to the database


buildepochgraph - compute the epochgraph among epochs for an ndi.epoch.epochset object

[COST,MAPPING] = BUILDEPOCHGRAPH(NDI_EPOCHSET_OBJ)

Compute the cost and the mapping among epochs in the EPOCHTABLE for an ndi.epoch.epochset object

COST is an MxM matrix where M is the number of EPOCHNODES. For example, if there is one epoch with clock types 'dev_local_time' and 'utc', then M is 2. Each entry COST(i,j) indicates whether there is a mapping between (epoch, clocktype) i to j. The cost of each transformation is normally 1 operation. MAPPING is the ndi.time.timemapping object that describes the mapping.

In the abstract class, the following NDI_CLOCKTYPEs, if they exist, are linked across epochs with a cost of 1 and a linear mapping rule with shift 1 and offset 0: 'utc' -> 'utc' 'utc' -> 'approx_utc' 'exp_global_time' -> 'exp_global_time' 'exp_global_time' -> 'approx_exp_global_time' 'dev_global_time' -> 'dev_global_time' 'dev_global_time' -> 'approx_dev_global_time'

See also: ndi.time.clocktype, ndi.time.clocktype/ndi.time.clocktype, ndi.time.timemapping, ndi.time.timemapping/ndi.time.timemapping, ndi.element.timeseries/EPOCHNODES

Help for ndi.element.timeseries/buildepochgraph is inherited from superclass NDI.EPOCH.EPOCHSET


buildepochtable - build the epoch table for an ndi.element

ET = BUILDEPOCHTABLE(NDI_ELEMENT_OBJ)

ET is a structure array with the following fields: Fieldname: | Description


'epoch_number' | The number of the epoch (may change) 'epoch_id' | The epoch ID code (will never change once established) | This uniquely specifies the epoch (with the session id). 'epoch_session_id' | Session of the epoch 'epochprobemap' | The epochprobemap object from each epoch 'epoch_clock' | A cell array of ndi.time.clocktype objects that describe the type of clocks available 't0_t1' | A cell array of ordered pairs [t0 t1] that indicates, for each ndi.time.clocktype, the start and stop | time of this epoch. The time units of t0_t1{i} match epoch_clock{i}. 'underlying_epochs' | A structure array of the ndi.epoch.epochset objects that comprise these epochs. | It contains fields 'underlying', 'epoch_number', and 'epoch_id'

Help for ndi.element.timeseries/buildepochtable is inherited from superclass NDI.ELEMENT


cached_epochgraph - return the cached epoch graph of an ndi.epoch.epochset object

[COST,MAPPING] = CACHED_EPOCHGRAPH(NDI_EPOCHSET_OBJ)

Return the cached version of the epoch graph, if it exists and is up-to-date (that is, the hash number from the EPOCHTABLE of NDI_EPOCHSET_OBJ has not changed). If there is no cached version, or if it is not up-to-date, COST and MAPPING will be empty. If the cached epochgraph is present and not up-to-date, it is deleted.

See also: NDI_EPOCHSET_OBJ/EPOCHGRAPH, NDI_EPOCHSET_OBJ/BUILDEPOCHGRAPH

Help for ndi.element.timeseries/cached_epochgraph is inherited from superclass NDI.EPOCH.EPOCHSET


cached_epochtable - return the cached epochtable of an ndi.epoch.epochset object

[ET, HASHVALUE] = CACHED_EPOCHTABLE(NDI_EPOCHSET_OBJ)

Return the cached version of the epochtable, if it exists, along with its HASHVALUE (a hash number generated from the table). If there is no cached version, ET and HASHVALUE will be empty.

Help for ndi.element.timeseries/cached_epochtable is inherited from superclass NDI.EPOCH.EPOCHSET


doc_unique_id - return the document unique reference for an ndi.element object

UNIQUE_REF = DOC_UNIQUE_REF(NDI_ELEMENT_OBJ)

Returns the document unique reference for NDI_ELEMENT_OBJ. If there is no associated document for the element, then empty is returned.

Help for ndi.element.timeseries/doc_unique_id is inherited from superclass NDI.ELEMENT


elementstring - Produce a human-readable element string

ELEMENTSTR = ELEMENTSTRING(NDI_ELEMENT_OBJ)

Returns the name as a human-readable string.

For ndi.element objects, this is the string 'element: ' followed by its name

Help for ndi.element.timeseries/elementstring is inherited from superclass NDI.ELEMENT


epoch2str - convert an epoch number or id to a string

S = EPOCH2STR(NDI_EPOCHSET_OBJ, NUMBER)

Returns the epoch NUMBER in the form of a string. If it is a simple integer, then INT2STR is used to produce a string. If it is an epoch identifier string, then it is returned.

Help for ndi.element.timeseries/epoch2str is inherited from superclass NDI.EPOCH.EPOCHSET


epochclock - return the ndi.time.clocktype objects for an epoch

EC = EPOCHCLOCK(NDI_ELEMENT_OBJ, EPOCH_NUMBER)

Return the clock types available for this epoch.

The ndi.element class always returns the clock type(s) of the element it is based on

Help for ndi.element.timeseries/epochclock is inherited from superclass NDI.ELEMENT


epochgraph - graph of the mapping and cost of converting time among epochs

[COST, MAPPING] = EPOCHGRAPH(NDI_EPOCHSET_OBJ)

Compute the cost and the mapping among epochs in the EPOCHTABLE for an ndi.epoch.epochset object

COST is an MxM matrix where M is the number of ordered pairs of (epochs, clocktypes). For example, if there is one epoch with clock types 'dev_local_time' and 'utc', then M is 2. Each entry COST(i,j) indicates whether there is a mapping between (epoch, clocktype) i to j. The cost of each transformation is normally 1 operation. MAPPING is the ndi.time.timemapping object that describes the mapping.

Help for ndi.element.timeseries/epochgraph is inherited from superclass NDI.EPOCH.EPOCHSET


epochid - Get the epoch identifier for a particular epoch

ID = EPOCHID (NDI_EPOCHSET_OBJ, EPOCH_NUMBER)

Returns the epoch identifier string for the epoch EPOCH_NUMBER. If it doesn't exist, it should be created. EPOCH_NUMBER can be a number of an EPOCH ID string.

The abstract class just queries the EPOCHTABLE. Most classes that manage epochs themselves (ndi.file.navigator, ndi.daq.system) will override this method.

Help for ndi.element.timeseries/epochid is inherited from superclass NDI.EPOCH.EPOCHSET


epochnodes - return all epoch nodes from an ndi.epoch.epochset object

[NODES,UNDERLYINGNODES] = EPOCHNODES(NDI_EPOCHSET_OBJ)

Return all EPOCHNODES for an ndi.epoch.epochset. EPOCHNODES consist of the following fields: Fieldname: | Description


'epoch_id' | The epoch ID code (will never change once established, though it may be deleted.) | This epoch ID uniquely specifies the epoch within the session. 'epoch_session_id' | The ID of the session that contains the epoch 'epochprobemap' | Any contents information for each epoch, usually of type ndi.epoch.epochprobemap or empty. 'epoch_clock' | A SINGLE ndi.time.clocktype entry that describes the clock type of this node. 't0_t1' | The times [t0 t1] of the beginning and end of the epoch in units of 'epoch_clock' 'underlying_epochs' | A structure array of the ndi.epoch.epochset objects that comprise these epochs. | It contains fields 'underlying', 'epoch_id', and 'epochprobemap' 'objectname' | A string containing the 'name' field of NDI_EPOCHSET_OBJ, if it exists. If there is no | 'name' field, then 'unknown' is used. 'objectclass' | The object class name of the NDI_EPOCHSET_OBJ.

EPOCHNODES are related to EPOCHTABLE entries, except a) only 1 ndi.time.clocktype is permitted per epoch node. If an entry in epoch table contains multiple ndi.time.clocktype entries, then each one will have its own epoch node. This aids in the construction of the EPOCHGRAPH that helps the system map time from one epoch to another. b) EPOCHNODES contain identifying information (objectname and objectclass) to help in identifying the epoch nodes across ndi.epoch.epochset objects.

UNDERLYINGNODES are nodes that are directly linked to this ndi.epoch.epochset's node via 'underlying' epochs.

Help for ndi.element.timeseries/epochnodes is inherited from superclass NDI.EPOCH.EPOCHSET


epochsetname - the name of the ndi.element object, for EPOCHNODES

NAME = EPOCHSETNAME(NDI_ELEMENT_OBJ)

Returns the object name that is used when creating epoch nodes.

For ndi.element objects, this is ndi.element/ELEMENTSTRING.

Help for ndi.element.timeseries/epochsetname is inherited from superclass NDI.ELEMENT


epochtable - Return an epoch table that relates the current object's epochs to underlying epochs

[ET,HASHVALUE] = EPOCHTABLE(NDI_EPOCHSET_OBJ)

ET is a structure array with the following fields: Fieldname: | Description


'epoch_number' | The number of the epoch. The number may change as epochs are added and subtracted. 'epoch_id' | The epoch ID code (will never change once established, though it may be deleted.) | This epoch ID uniquely specifies the epoch. 'epoch_session_id' | The session ID that contains this epoch 'epochprobemap' | Any contents information for each epoch, usually of type ndi.epoch.epochprobemap or empty. 'epoch_clock' | A cell array of ndi.time.clocktype objects that describe the type of clocks available 't0_t1' | A cell array of ordered pairs [t0 t1] that indicates, for each ndi.time.clocktype, the start and stop | time of this epoch. The time units of t0_t1{i} match epoch_clock{i}. 'underlying_epochs' | A structure array of the ndi.epoch.epochset objects that comprise these epochs. | It contains fields 'underlying', 'epoch_number', 'epoch_id', and 'epochprobemap'

HASHVALUE is the hashed value of the epochtable. One can check to see if the epochtable has changed with ndi.epoch.epochset/MATCHEDEPOCHTABLE.

After it is read from disk once, the ET is stored in memory and is not re-read from disk unless the user calls ndi.epoch.epochset/RESETEPOCHTABLE.

Help for ndi.element.timeseries/epochtable is inherited from superclass NDI.EPOCH.EPOCHSET


epochtableentry - return the entry of the EPOCHTABLE that corresonds to an EPOCHID

ET_ENTRY = EPOCHTABLEENTRY(NDI_EPOCHSET_OBJ, EPOCH_NUMBER_OR_ID)

Returns the EPOCHTABLE entry associated with the ndi.epoch.epochset object that corresponds to EPOCH_NUMBER_OR_ID, which can be the number of the epoch or the EPOCHID of the epoch.

Help for ndi.element.timeseries/epochtableentry is inherited from superclass NDI.EPOCH.EPOCHSET


getcache - return the NDI_CACHE and key for ndi.element

[CACHE,KEY] = GETCACHE(NDI_ELEMENT_OBJ)

Returns the CACHE and KEY for the ndi.element object.

The CACHE is returned from the associated session. The KEY is the probe's ELEMENTSTRING plus the TYPE of the ELEMENT.

See also: ndi.file.navigator

Help for ndi.element.timeseries/getcache is inherited from superclass NDI.ELEMENT


id - return the document unique identifier for an ndi.element object

UNIQUE_REF = ID(NDI_ELEMENT_OBJ)

Returns the document unique reference for NDI_ELEMENT_OBJ. If there is no associated document for the element, then an error is returned.

Help for ndi.element.timeseries/id is inherited from superclass NDI.ELEMENT


issyncgraphroot - should this object be a root in an ndi.time.syncgraph epoch graph?

B = ISSYNCGRAPHROOT(NDI_ELEMENT_OBJ)

This function tells an ndi.time.syncgraph object whether it should continue adding the 'underlying' epochs to the graph, or whether it should stop at this level.

For ndi.element objects, this returns 0 so that underlying ndi.probe epochs are added.

Help for ndi.element.timeseries/issyncgraphroot is inherited from superclass NDI.ELEMENT


load_all_element_docs - load all of the ndi.element objects from an session database

ELEMENT_DOCS = LOAD_ALL_ELEMENT_DOCS(NDI_ELEMENT_OBJ)

Loads the ndi.document that is based on the ndi.element object and any associated epoch documents.

Help for ndi.element.timeseries/load_all_element_docs is inherited from superclass NDI.ELEMENT


load_element_doc - load a element doc from the session database

ELEMENT_DOC = LOAD_ELEMENT_DOC(NDI_ELEMENT_OBJ)

Load an ndi.document that is based on the ndi.element object.

Returns empty if there is no such document.

Help for ndi.element.timeseries/load_element_doc is inherited from superclass NDI.ELEMENT


loadaddedepochs - load the added epochs from an ndi.element

[ET_ADDED, EPOCHDOCS] = LOADADDEDEOPCHS(NDI_ELEMENT_OBJ)

Load the EPOCHTABLE that consists of added/registered epochs that provide information about the ndi.element.

Help for ndi.element.timeseries/loadaddedepochs is inherited from superclass NDI.ELEMENT


matchedepochtable - compare a hash number from an epochtable to the current version

B = MATCHEDEPOCHTABLE(NDI_EPOCHSET_OBJ, HASHVALUE)

Returns 1 if the current hashed value of the cached epochtable is identical to HASHVALUE. Otherwise, it returns 0.

Help for ndi.element.timeseries/matchedepochtable is inherited from superclass NDI.EPOCH.EPOCHSET


ndi_unique_id - Generate a unique ID number for NDI projects

ID = NDI_UNIQUE_ID

Generates a unique ID character array based on the current time and a random number. It is a hexidecimal representation of the serial date number in UTC Leap Seconds time. The serial date number is the number of days since January 0, 0000 at 0:00:00. The integer portion of the date is the whole number of days and the fractional part of the date number is the fraction of days.

ID = [NUM2HEX(SERIAL_DATE_NUMBER) '_' NUM2HEX(RAND)]

See also: NUM2HEX, NOW, RAND

Help for ndi.element.timeseries.ndi_unique_id is inherited from superclass NDI.IDO


newdocument - need docs here


numepochs - Number of epochs of ndi.epoch.epochset

N = NUMEPOCHS(NDI_EPOCHSET_OBJ)

Returns the number of epochs in the ndi.epoch.epochset object NDI_EPOCHSET_OBJ.

See also: EPOCHTABLE

Help for ndi.element.timeseries/numepochs is inherited from superclass NDI.EPOCH.EPOCHSET


readtimeseries - read the ndi.element.timeseries data from a probe based on specified time relative to an NDI_TIMEFERENCE or epoch

[DATA, T, TIMEREF] = READTIMESERIES(NDI_ELEMENT_TIMESERIES_OBJ, TIMEREF_OR_EPOCH, T0, T1)

Reads timeseries data from an ndi.element.timeseries object. The DATA and time information T that are returned depend on the the specific subclass of ndi.element.timeseries that is called (see READTIMESERIESEPOCH).

In the base class, this function merely calls the element's probe's READTIMESERIES function. TIMEREF_OR_EPOCH is either an ndi.time.timereference object indicating the time reference for T0, T1, or it can be a single number, which will indicate the data are to be read from that epoch.

DATA is the data for the probe. T is a time structure, in units of TIMEREF if it is an ndi.time.timereference object or in units of the epoch if an epoch is passed. The TIMEREF is returned.


resetepochtable - clear an ndi.epoch.epochset epochtable in memory and force it to be re-read from disk

NDI_EPOCHSET_OBJ = RESETEPOCHTABLE(NDI_EPOCHSET_OBJ)

This function clears the internal cached memory of the epochtable, forcing it to be re-read from disk at the next request.

See also: ndi.element.timeseries/EPOCHTABLE

Help for ndi.element.timeseries/resetepochtable is inherited from superclass NDI.EPOCH.EPOCHSET


samplerate - return the sample rate of an ndi.time.timeseries object

SR = SAMPLE_RATE(NDI_TIMESERIES_OBJ, EPOCH)

Returns the sampling rate of a given ndi.time.timeseries object for the epoch EPOCH. EPOCH can be specified as an index or EPOCH_ID.

If NDI_TIMESERIES_OBJ is not regularly sampled, then -1 is returned.

Help for ndi.element.timeseries/samplerate is inherited from superclass NDI.TIME.TIMESERIES


samples2times - convert from the timeseries time to sample numbers

SAMPLES = TIME2SAMPLES(NDI_TIMESERIES_OBJ, EPOCH, TIMES)

For a given ndi.time.timeseries object and a recording epoch EPOCH, return the sample index numbers SAMPLE that corresponds to the times TIMES. The first sample in the epoch is 1. The TIMES requested might be out of bounds of the EPOCH; no checking is performed.

TODO: convert times to dev_local_clock

Help for ndi.element.timeseries/samples2times is inherited from superclass NDI.TIME.TIMESERIES


searchquery - need docs here


t0_t1 - **

T0_T1 - return the t0_t1 (beginning and end) epoch times for an epoch

T0T1 = T0_T1(NDI_EPOCHSET_OBJ, EPOCH_NUMBER)

Return the beginning (t0) and end (t1) times of the epoch EPOCH_NUMBER in the same units as the ndi.time.clocktype objects returned by EPOCHCLOCK.

The abstract class always returns {[NaN NaN]}.

See also: ndi.time.clocktype, EPOCHCLOCK

TODO: this must be a bug, it's just self-referential

Help for ndi.element.timeseries/t0_t1 is inherited from superclass NDI.ELEMENT


times2samples - convert from the timeseries time to sample numbers

SAMPLES = TIMES2SAMPLES(NDI_TIMESERIES_OBJ, EPOCH, TIMES)

For a given ndi.time.timeseries object and a recording epoch EPOCH, return the sample index numbers SAMPLE that corresponds to the times TIMES. The first sample in the epoch is 1. The TIMES requested might be out of bounds of the EPOCH; no checking is performed.

Help for ndi.element.timeseries/times2samples is inherited from superclass NDI.TIME.TIMESERIES


timeseries - define or examine a element in the session


underlyingepochnodes - find all the underlying epochnodes of a given epochnode

[UNODES, COST, MAPPING] = UNDERLYINGEPOCHNODES(NDI_EPOCHSET_OBJ, EPOCHNODE)

Traverse the underlying nodes of a given EPOCHNODE until we get to the roots (an ndi.epoch.epochset object with ISSYNGRAPHROOT that returns 1).

Note that the EPOCHNODE itself is returned as the first 'underlying' node.

See also: ISSYNCGRAPHROOT

Help for ndi.element.timeseries/underlyingepochnodes is inherited from superclass NDI.EPOCH.EPOCHSET