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<p class="MsoNormal">Hello Huibin,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1. Let f_N be the Nyquist frequency. The wavelet scale j is related to the frequency range [f_N/2^{j+1}, f_N/2^j]. So, if the sample rate = 1 second and you set up the option range=[1, 5], it would correspond to the frequency range [0.015625,
0.5] Hz. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">2. The signal length should be a power of 2 in DWT. However, the input signal to bfn_mfin_ml is not necessary to have the length of power of 2 since it will automatically truncate the signal; for example, the signal with 100 will be truncated
as 2^6=64.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I wish it is helpful for you. Thank you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Wonsang<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> nonfractal-commits-bounces@www.nitrc.org [mailto:nonfractal-commits-bounces@www.nitrc.org]
<b>On Behalf Of </b>Hui-bin Jia<br>
<b>Sent:</b> Monday, October 16, 2017 10:33 AM<br>
<b>To:</b> nonfractal-commits <nonfractal-commits@www.nitrc.org><br>
<b>Subject:</b> [Nonfractal-commits] how to define the scale range<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear Wonsang,<o:p></o:p></p>
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<p class="MsoNormal"> I have only limited knowledge about DWT. In the function bfn_mfin_ml we need to define the scale range. I think this option is used to define the frequency range in Hurst estimation.<o:p></o:p></p>
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<p class="MsoNormal">Usually, the frequency range in fMRI analysis is defined to be [0.01 0.1] Hz. Could you give me some tips about how to define the scale range according to the frequency range?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In some papers, the authors argue that the signal length should be a power of 2 in order to obtain DWT-based Hurst exponent. I'm asking whether the signal length should be a power of 2 in function bfn_mfin_ml?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you!<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best Regards,<o:p></o:p></p>
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<p class="MsoNormal">Huibin Jia<o:p></o:p></p>
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