Data Acquisition Toolbox

size

Return the size of a device object, channel group, or line group

Syntax

• d = size(obj)
  [m1,m2,m3,...,mn] = size(obj)
  m = size(obj,dim)
  d = size(obj.Channel)
  [m1,m2,m3,...,mn] = size(obj.Channel)
  m = size(obj.Channel,dim)
  d = size(obj.Line)
  [m1,m2,m3,...,mn] = size(obj.Line)
  m = size(obj.Line,dim)
  

Arguments

obj	A device object or array of device objects.
dim	The dimension.
obj.Channel	The channels contained by obj.
obj.Line	The lines contained by obj.
d	A two-element row vector containing the number of rows and columns in obj.
m1,m2,m3,...,mn	Each dimension of obj is captured in a separate variable.
m	The length of the dimension specified by dim.

Description

d = size(obj) returns the two-element row vector d = [m,n] containing the number of rows and columns in obj.

[m1,m2,m3,...,mn] = size(obj) returns the length of the first n dimensions of obj to separate output variables. For example, [m,n] = size(obj) returns the number of rows to m and the number of columns to n.

m = size(obj,dim) returns the length of the dimension specified by the scalar dim. For example, size(obj,1) returns the number of rows.

d = size(obj.Channel) returns the two-element row vector d = [m,n] containing the number of rows and columns in the channel group obj.Channel.

[m1,m2,m3,...,mn] = size(obj.Channel) returns the length of the first n dimensions of the channel group obj.Channel to separate output variables. For example, [m,n] = size(obj.Channel) returns the number of rows to m and the number of columns to n.

m = size(obj.Channel,dim) returns the length of the dimension specified by the scalar dim. For example, size(obj.Channel,1) returns the number of rows.

d = size(obj.Line) returns the two-element row vector d = [m,n] containing the number of rows and columns in the line group obj.Line.

[m1,m2,m3,...,mn] = size(obj.Line) returns the length of the first n dimensions of the line group obj.Line to separate output variables. For example, [m,n] = size(obj.Line) returns the number of rows to m and the number of columns to n.

m = size(obj.Line,dim) returns the length of the dimension specified by the scalar dim. For example, size(obj.Line,1) returns the number of rows.

Example

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

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

To find the size of the device object:

• size(ai)
  ans =
       1     1
  

To find the size of the channel group:

• size(ch)
  ans =
       8     1
  

See Also

Functions

length

showdaqevents

softscope