UserData (Data Acquisition Toolbox)

UserData stores data that you want to associate with the device object.

Characteristics


Device Objects	AI, AO
Class	Common
Access	Read/write
Data Type	Any type
Modify while Running	Yes

Values

The default value is an empty vector.

Example

Suppose you create an analog input object ai and want to access filter coefficients during an acquisition. A structure can be created to store these coefficients, which can then be stored in UserData.

coeff.a = 1.0
coeff.b = -1.25
ai.UserData = coeff;

To return the second coefficient

x = ai.UserData;
x.b
ans =
   -1.2500

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