"Warning: Integer operands are required for colon operator when used as index" in fft

1 次查看（过去 30 天）
Guglielmo Giambartolomei
评论： Guglielmo Giambartolomei 2016-10-11
Hello everyone, I tried to write a script in order to perform a fft of an accelerometric signal. When I run the code the warning in object appears. Below the faulty code line (second line):
xdft1=fft(x1-mean(x1))/N1;
xdft1=xdft1(1:N1/2+1);
where x1 is the accelerometric signal and N1=length(x1). I deem the problem is in the operation N1/2 and I think I have to use the function "floor". Can you help me? Thank you very much!

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2016-10-11
N1 is odd, so N1/2 is a fraction. Add 1 to that and it is still a fraction. You are then trying to index from 1 to that fraction. That will give you a warning.
You need to either prevent N1 from being odd, or else you need to use floor() or fix() or round() on the N1/2 so that it is no longer a fraction
  1 个评论
Guglielmo Giambartolomei
Guglielmo Giambartolomei 2016-10-11
Thank you Walter, I changed the code line with xdft1=xdft1(1:floor(N1/2)+1) and the warning disappeared. Now I have to understand better what the code do.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Correlation and Convolution 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by