making different signals equal in length

Question

Lisa Justin 2012-12-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55491-making-different-signals-equal-in-length

评论： chaitanya 2016-2-27

采纳的回答： Jan

Hi, I am working with a set of data and i need all of them to be the same length. how can i do this?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2012-12-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55491-making-different-signals-equal-in-length#answer_67344

It depends. As said already you can crop the longer ones, pad the shorter ones or apply an interpolation. For the latter there are linear, cubic, spline, bsline, trigonometric and more complicated interpolation methods.

2 个评论
显示无隐藏无

aliya 2015-6-1

编辑：aliya 2015-6-1

What if we have multiple signals from a database of different sizes. how to make their length equal?

Walter Roberson 2015-6-1

在 MATLAB Online 中打开

Find the maximum of their lengths, say maxlen. Then for each,

ifft(fft(TheSignal),maxlen)

请先登录，再进行评论。

Answer 2

Walter Roberson 2012-12-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55491-making-different-signals-equal-in-length#answer_67295

在 MATLAB Online 中打开

S1 = size(FirstMatrix);
S2 = size(SecondMatrix);
MaxS = max(S1, S2);
if MaxS(1) > S1(1); FirstMatrix(end+1:MaxS(1), :) = 0; end
if MaxS(2) > S1(2); FirstMatrix(:, end+1:MaxS(2)) = 0; end
if MaxS(1) > S2(1); SecondMatrix(end+1:MaxS(1), :) = 0; end
if MaxS(2) > S2(2); SecondMatrix(:, end+1:MaxS(2)) = 0; end

You can simplify this a bit if you are using vectors and you know the orientation of the vectors.

3 个评论
显示 1更早的评论隐藏 1更早的评论

Lisa Justin 2012-12-3

编辑：Lisa Justin 2012-12-3

yes exactly. But then i lose some relevant part of the signal which is not good either. I am a bit unsure how best to make all the length equal. they are about 600 files

chaitanya 2016-2-27

thanks..it is useful

请先登录，再进行评论。

Answer 3

Muruganandham Subramanian 2012-12-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55491-making-different-signals-equal-in-length#answer_67302

Can you provide the data? you can do it by adding zeros, ones, any desirable data to the data having minimum sizes from data having maximum sizes by initializing max. data length caustiously..