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Re: different results in fft of an chirp in matlab and octave

From: Dietmar Warning
Subject: Re: different results in fft of an chirp in matlab and octave
Date: Thu, 8 Mar 2018 06:40:52 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0


for all the response.

I have tried to file a report but I have no account and I am an temporary user of octave.

Sorry, can someone post a bug report. I have used octave 4.2.1 under windows.

Thank you,


Am 07.03.2018 um 22:33 schrieb Mike Miller:
On Wed, Mar 07, 2018 at 14:47:54 +0100, Dietmar Warning wrote:
can anybody help me to find out why I get different results by
plotting the fft results of a 800 ... 50kHz chirp Signal in matlab and

Please see the attached screenshots and the used script. It looks for
me that the behaviour in low frequency end is more reasonable in
Yes, this is likely an error in the Octave chirp function with the
"logarithmic" option. It would be very helpful if you could file a bug
with your example showing the difference at

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