length (Data Acquisition Toolbox)

Return the length of a data acquisition device object, channel group, or line group.

Syntax

length(obj)

length(obj.Channel)

length(obj.Line)

Description

length(obj) returns the length of data acquisition device object obj. It is equivalent to maxsize(obj).

length(obj.Channel) returns the length of the channel group obj.Channel.

length(obj.Line) returns the length of the line group obj.Line.

Example

Suppose you create the analog input object ai for a National Instruments board and add 8 channels to it.

ai = analoginput('nidaq', 1);
ch = addchannel(ai, 0:7);

To find the length of the device object

length(ai)
ans =
     1

To find the length of the channel group

length(ch)
ans =
     1