S-function 2 dimension Dwork?

Question

alex pabouctsidis 2013-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/76420-s-function-2-dimension-dwork

评论： Nshine 2020-2-12

Hello,

I'm coding a state estimator (EKF) using an matlab coded s-function, and need to store the state and covariance matrix at each time step.

Is it possible to set the Dwork to a 2 dimensional matrix? If so, how? If not, are there any other alternative methods to store the covariance matrix after each step?

Thanks, Alex

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Answer 1

Kaustubha Govind 2013-5-20

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No, AFAIK, S-function DWorks can only be vectors (1-D). Why not simply reshape the matrix to a vector and vice versa?

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Sepehr Ariaei 2019-4-16

Miss. Govind,

MATLAB should really develop this DWork vector for multi-dimensional approach. It has been 6 years since people commented this and still it's not possible to do it. If you please add this as a feature would come in handy in the future! I really needed this.

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Answer 2

Erwin Torreao Dassen 2013-9-2

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Humm... I was also needing this. Elsewhere in Simulink when specifying dimensions one can use an array like [2 3] to specify a 2D (or even more) signal. This doesn't work for the Dwork vector. Nowhere in the documentation is this stated and the "dimensions" name for the dwork property is misleading. It would be very good to support multidimensional work vectors (feature request?). For now at least state this in the documentation.

Kind regards,

Erwin

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Nshine 2020-2-12

I completely agree with this answer. The documentation is not clear, and in fact inconsisent with Matlab's typical use of 'dimension'. If it is stated somewhere, I havent been able to easily find it.

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