Converting iddata to a double

Question

Nick 2011-4-29

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6489-converting-iddata-to-a-double

回答： Koke Yao 2020-2-24

I have a data set from an experiment that I have converted to an iddata object to simplify filtering. However, after filtering the data, I would like to perform algorithms that would normally be performed on vector data. I cannot find a way to do these processes to the iddata object, so I would like to convert back to a vector. I have found no way to convert these data back to a vector format to manipulate it. Is this possible to do in Matlab? Or would it be easier to filter the data in the vector format initially?

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Answer 1

Jarrod Rivituso 2011-4-29

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6489-converting-iddata-to-a-double#answer_8981

在 MATLAB Online 中打开

Is this what you mean?

%Create fake data
u = (0:0.01:2*pi)';
y = sin(u) + 0.1*randn(size(u));
%Create iddata object
data = iddata(y,u,0.01);
%Filter iddata object
dataFilt = idfilt(data,{[1/3 1/3 1/3],[1]})
%Get new data back
uNew = dataFilt.u;
yNew = dataFilt.y;

As for other ways to filter, there are many. Check out demos for the Signal Processing Toolbox, or the basic MATLAB filter function.

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Answer 2

Julian Antolin 2017-4-13

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6489-converting-iddata-to-a-double#answer_262854

Note: This question was asked a long time ago and you surely have figured out what you need to do. However, I will post my reply just in case it's helpful to somebody else.

I had the same question as you. Looking through search results, I came across a Mathworks site that answered it for me.

If, say, you have a 2 channel signal in an iddata structure, you can access the output channels by: y1 = data.y(:,1); y2 = data.y(:,2);

Now y1 and y2 are regular double arrays.

Julian