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Return the size of a data acquisition 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)
Description
d = size(obj) returns the two-element row vector d = [m, n] containing the number of rows and columns in the data acquisition device object 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
Suppose you create the analog input objectai for a National Instruments board and add 8 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