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Clarification over Directional derivatives for vector variables. #618

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masoud-najafi opened this issue Sep 12, 2019 · 0 comments

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@masoud-najafi
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commented Sep 12, 2019

I have a concern over directional derivatives for vector and multi dimensional case. Take for example the directional derivatives of a vector output Y which is expressed as:
Delata Y=(del F/del X) *Delata X + (del F/del Ui) *Delta Ui
where Y is an output, X is the state vector and Ui is ith input.
Unlike in FMI2.0, all Y, X, and Ui can be vector or multi-dimensional.
My question is the meaning of partial derivatives in case of multi-dimensional or matrix elements?
For example how to provide del F/del Ui. Maybe I am missing something, but it leads to tensorial calculus.
Also, I do not remember if matrix state vector is allowed or not? if yes, what is the meaning of del F/del X?
Any comment to clarify this?

@chrbertsch chrbertsch added this to the v3.0 milestone Sep 28, 2019
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