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Memory

Output the block input from the previous integration step.

Library

Continuous

Description

The Memory block outputs its input from the previous time step, applying a one integration step sample-and-hold to its input signal.

This sample model (which, to provide more useful information, would be part of a larger model) demonstrates how to display the step size used in a simulation. The Sum block subtracts the time at the previous step, generated by the Memory block, from the current time, generated by the clock.


Note
Avoid using the Memory block when integrating with ode15s or ode113, unless the input to the block does not change.

Data Type Support

A Memory block accepts signals of any numeric type (complex or real) and data type, including user-defined types. If the input type is user-defined, the initial condition must be 0.

Parameters and Dialog Box

Initial condition
The output at the initial integration step.
Inherit sample time
Check this box to cause the sample time to be inherited from the driving block.

Characteristics

Direct Feedthrough
 No
Sample Time
 Continuous, but inherited if the Inherit sample time check box is selected
Scalar Expansion
 Of the Initial condition parameter
Vectorized
 Yes
Zero Crossing
 No


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