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Extracting certain frequency band

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I have a signal that runs for 1 year. I'm only interested on the signal with frequency within 0.01 to 0.1 Hz. How do I extract this range of signal? I have tried several methods but I'm not sure if I did it correctly. For instance, I have tried using a function from this particular user (link: but the output doesn't seem right (refer picture). The "filtered" signal looks too weak and it's even symmetrical. I don't think that's possible since the original signal is anything but left-right symmetrical. Please help me.

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Walter Roberson
Walter Roberson on 15 Nov 2017
  1 Comment
Adib Yusof
Adib Yusof on 15 Nov 2017
I will look up to the manual. Will be back to you once I've tried it. Thanks!

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