difference of a vector, diff()

Question

DN 2016-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/296782-difference-of-a-vector-diff

评论： DN 2016-7-22

Hi, I'm trying to figure out how to do a simple difference of a vector using HDL coder compatible Simulink blocks. I want to shift the bits so to speak and subtract essentially, so probably need to use some bitrol or something. I.e. I would like to implement the DIFF(X), for a vector X, being [X(2)-X(1) X(3)-X(2) ... X(n)-X(n-1)] using blocks. Thanks

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Answer 1

Azzi Abdelmalek 2016-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/296782-difference-of-a-vector-diff#answer_229486

在 MATLAB Online 中打开

Use Matlab function block with this code

function y = fcn(u)
%#codegen
y = diff(u);

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DN 2016-7-22

Thanks Azzi, but I don't think its that simple. Type in your command window hdllib, and you will see there is no block supported for this, nor if you look into the HDL documentation is the function diff() supported among the list of functions for HDL Coder regardless if you use a user defined function block as wrapping. Have you actually tried converting to HDL code when use the above by right clicking, not just C/C++ code generation ready but HDL, there's a difference. Perhaps I'm missing something, thanks for your help.

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