length (Data Acquisition Toolbox)

Return the length of a 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.

`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.

Example

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

ai = analoginput('nidaq',1);
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',1);
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
```

See Also

Functions

size

isvalid load