Use input vector S-function to define initial conditions x0()

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Is there any way how use input vector S-function to define initial conditions x0(). I know I can define these vector by varible in mask but it isn't good way for me.

Thanks a lot!

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Answer 1

Kaustubha Govind 2013-5-1

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No, this is not possible. At the time that the block Initialize method runs, none of the block's Output methods have fun. So whatever block is upstream to your S-function hasn't yet written to it's output (which becomes the input to the S-function). However, there are some special blocks like the Delay block which have an input port to specify the Initial Condition (S-functions currently do not have this functionality). So perhaps you can somehow use this block in combination with your S-function to achieve what you need?

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Jan 2013-5-1

Thank you for reply. But i dont understand your solutions with Delay block. Maybe I should say:

In S-function I solve set of ODE's for solve step response of chemical reactor output variable. To compute ODE's I need first solve initial conditions x(0). Initial conditions are function of input vector u() and I can't use this vector u(0) while initializing.

Is it solvable by mentioned Delay?I wrote it understandable? :-)

Thanks!

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