ischannel (Data Acquisition Toolbox)

Check for channels.

Syntax

ischannel(obj.Channel(index))

Description

ischannel(obj.Channel(index)) returns a logical "1" if obj.Channel(index) is a channel. Otherwise, a logical "0" is returned. ischannel does not determine if channels are valid (associated with hardware). To check for valid channels, use the isvalid function.

Note:
Typically, you use ischannel directly only when you are creating your own M-files.

Example

Suppose you create the function func for use with the Data Acquisition Toolbox. If func is passed one or more channels as an input argument, then the first thing you should do in the function is check if the argument is a channel.

function func(obj.Channel)
% Determine if a channel was passed.
if ~ischannel(obj.Channel)
   error('The argument passed is not a channel.');
end

You can examine the Data Acquisition Toolbox M-files for examples using ischannel.