How to initialize the size of a Simulink vector with a constant block

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Jay Land 2013-4-8

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I have a nx1 length rand vector being used in a Simulink model. I would like to be able to change its length, n using a constant block. I am new to Simulink so this is probably a pretty basic question but I can't get it to work. I can create the vector as a constant with rand(10,1) for example or I can set N=10 in the Matlab workspace and use rand(N,1) as the constant but I want to be able to change N on the block diagram.

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Answer 1

Kaustubha Govind 2013-4-22

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If 'N' changes during simulation, it essentially means that the size of the signal (Nx1) changes during simulation. These types of signals are called Variable-size signals in Simulink and must be bounded (ie. you need to specify an upper bound for N). I can't think of an existing block that lets you output a variable-size signal with values rand(N,1), but you can easily implement such a block using a MATLAB Function block. Please also remember to configure the block to output a variable-size signal.