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isaUnderlying

Determine if tall array data is of specified class

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Syntax

tf = isaUnderlying(X,cl)

Description

example

tf = isaUnderlying(X,cl)returns a tall array containing logical1(true) if the underlying data in tall arrayXis of classcl. Otherwise, the tall array contains logical0(false).

Examples

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Open Live Script

All tall tables and arrays belong to thetallclass. However, theunderlying数据type of a tall array can vary.

Create a datastore for theairlinesmall.csv数据set. Select a subset of the variables to work with, and treat'NA'values as missing data so that数据storereplaces them withNaNvalues. Convert the datastore into a tall table.

varnames = {“年”,'UniqueCarrier'}; ds = datastore('airlinesmall.csv','TreatAsMissing','NA',...'SelectedVariableNames',varnames); tt = tall(ds)
tt = M×2 tall table Year UniqueCarrier ____ _____________ 1987 'PS' 1987 'PS' 1987 'PS' 1987 'PS' 1987 'PS' 1987 'PS' 1987 'PS' 1987 'PS' : : : :

Test whether the underlying data type of the first table variableYearissingle.

tf = isaUnderlying(tt.Year,'single')
tf = tall logical 0

Determine the actual underlying data type ofYear.

udt = classUnderlying(tt.Year)
udt = 1×6 tall char array 'double'

Input Arguments

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Input array, specified as a tall array.

Data Types:single|double|int8|int16|int32|int64|uint8|uint16|uint32|uint64|logical|table|cell|categorical|datetime|duration|calendarDuration

Underlying class, specified as a character vector specifying any valid MATLAB®class name.

Example:tf = isaUnderlying(X,'double')

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Topics

Introduced in R2016b

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