Lua table insert append
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Local samples = myAttr : getSamples () for i = 0, # samples - 1 do local sample = samples : get ( i ) for j = 0, # sample - 1 do print ( i, j, sample : get ( j )) end end size ( ) → int ¶ Unlike Lua tables, sample objects are indexed from 0, not 1. Ipairs() function, as well as taking the size with the # Like Lua tables, sample objects support iteration using the Sample objects represent a lightweight, read-only view into a particlar time ReturnsĪ read-only view into the sequence of sample times in the The index of the sample closest to time getSampleTimes ( ) → ArrayView ¶ Returns 0 if theĪccessor contains no time samples. Returns the index of the sample closest to time. The sample closest to time getNearestSampleIndex ( float time ) → int ¶ If the accessor contains no time samples. The sample at index sampleIndex getNearestSample ( float time ) → Sample ¶ SampleIndex – the sample index to query Returns The number of values in each time sample. The number of samples in the attribute getNumberOfValues ( ) → int ¶ Returns the number of samples in the attribute. The last sample getNumberOfTimeSamples ( ) → int ¶ Raises an error if there are no time samples. True if the attribute has no time samples, false otherwise. Tests whether if the attribute has no time samples. Number of samples in the attribute empty ( ) → boolean ¶ Sample accessor objects support iterating over all time samples using theįor i, sample in ipairs ( myAttr : getSamples ()) do ProcessSample ( sample ) end size ( ) → int ¶Īlias of getNumberOfTimeSamples(). SampleAccessor provides access to the sample buffers contained in a
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class StringAttribute ¶Ī class representing a data attribute containing strings. class DoubleAttribute ¶Ī class representing a data attribute containing double-precision floats. class FloatAttribute ¶Ī class representing a data attribute containing single-precision floats. class IntAttribute ¶Ī class representing a data attribute containing integers. However, if defaultValue is provided and throwOnError isįalse, defaultValue will be returned. Single sample of a single value at time 0.0.īy default, throws exception if there are no time samples or no valuesĪvailable. This is aĬonvenience for the extremely common case of an attribute that stores a Returns the first value from the time sample nearest 0.0. Return the number of data values per tuple for this attribute. If the index is not valid, 0.0 is returned.
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Returns a float value containing the time at a particular index for thisĪttribute. getSampleTime ( int sampleIndex ) → float ¶ This will beĮqual to getNumberOfTuples() * getTupleSize(). Returns the total number of data values for this attribute. Returns the number of tuples in this attribute. Returns the number of time samples at which data is recorded in this Returns a read-only view into the samples of the attribute. GetSamples() to inspect and manipulate large attributes. Lua tablesĬannot contain more than 2^27 (134 million) values. Designing Node Graphs for Optimal Performance.Profiling and Optimization Guide: Start Here.More friendly to be distributed across many Redis instances.Īn example sampling the temperature of a sensor using fixed-size strings (usingĪ binary format is better in real implementations). Samples per key, to avoid dealing with very big keys, and to make this pattern Time, in this way it is possible to have just a relatively small amount of Hint: it is possible to switch to a different key based on the current Unix
#Lua table insert append series#
However the space efficiency of time series stored in this way is remarkable. Of operation, there is no way to cut the time series to a given size easilyīecause Redis currently lacks a command able to trim string objects. The limitation of this pattern is that we are forced into an append-only mode