Data Acquisition Toolbox™

length - Length of device object, channel group, or line group

Syntax

out = length(obj)
out = length(obj.Channel)
out = length(obj.Line)

Arguments

`obj`	A device object or array of device objects.
`obj.Channel`	The channels contained by `obj`.
`obj.Line`	The lines contained by `obj`.
`out`	A double.

Description

out = length(obj) returns the length of the device object obj to out.

out = length(obj.Channel) returns the length of the channel group contained by obj.

out = length(obj.Line) returns the length of the line group contained by obj.

Examples

Create the analog input object ai for a National Instruments^® board and add eight channels to it.

ai = analoginput('nidaq','Dev1');
aich = addchannel(ai,0:7);

Create the analog output object ao for a National Instruments board, add one channel to it, and create the device object array aiao.

ao = analogoutput('nidaq','Dev1');
aoch = addchannel(ao,0);
aiao = [ai ao]

Index:    Subsystem:         Name:
   1         Analog Input       nidaq1-AI
   2         Analog Output      nidaq1-AO

To find the length of aiao:

length(aiao)
ans =
     2

To find the length of the analog input channel group:

length(aich)
ans =
     8

length - Length of device object, channel group, or line group

Syntax

Arguments

Description

Examples

See Also

Functions