Data Acquisition Toolbox

Creating an Array of Device Objects

In MATLAB, you can create an array from existing variables by concatenating those variables together. The same is true for device objects. For example, suppose you create the analog input object ai and the analog output object ao for a sound card:

• ai = analoginput('winsound');
  ao = analogoutput('winsound');
  

You can now create a device object array consisting of ai and ao using the usual MATLAB syntax. To create the row array x:

• x = [ai ao]
  
     Index:    Subsystem:         Name:
     1         Analog Input       winsound0-AI
     2         Analog Output      winsound0-AO
  

To create the column array y:

• y = [ai;ao];
  

Note that you cannot create a matrix of device objects. For example, you cannot create the matrix

• z = [ai ao;ai ao];
  ??? Error using ==> analoginput/vertcat
  Only a row or column vector of device objects can be created.
  

Depending on your application, you might want to pass an array of device objects to a function. For example, using one call to the set function, you can configure both ai and ao to the same property value.

• set(x,'SampleRate',44100)
  

Refer to Function Reference, to see which functions accept a device object array as an input argument.

Creating a Device Object

Where Do Device Objects Exist?