<div dir="ltr">Dear Jumana,<div><br></div><div>> I am not using the GUI so do I need to specific double precision every time I reload the data?</div><div><br></div><div>Yes, you still need to change the EEGLAB option.<br><br>> Also, as I batch process 600 subjects, I save the data after nearly every major processing step.<br><br>That's a big number of datasets!<br><br>> Unfortunately I did not realise the file options were ticket to single precision. Therefore I filtered the data and referenced to a single electrode, deleted bad segments of data and then saved, loaded the data and then ran ICA.<br>> I realise that pop runica converts to double precision, but would I have lost information in previous process of steps by having the 'single' default ticked?<br>> Do I therefore need to redo my analysis? And if so, how should I concert to double in code? And do I do it after every save, or after every computation?<br></div><div><br></div><div>You don't need to worry about it. Single precision becomes a problem when you deal with matrix operations such as pinv() etc. For standard processes, using single precision is ok; infomax was automatically performed as double precision as you mentioned, which is a requirement!</div><div><br></div><div>Makoto</div><div><br></div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Dec 4, 2016 at 3:23 AM, Ahmad, Jumana <span dir="ltr"><<a href="mailto:jumana.ahmad@kcl.ac.uk" target="_blank">jumana.ahmad@kcl.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Dear all,<br>
<br>
I understand the rationale for using double precision, but am confused as to when to convert the data. I am not using the GUI so do I need to specific double precision every time I reload the data?<br>
<br>
Also, as I batch process 600 subjects, I save the data after nearly every major processing step.<br>
<br>
Unfortunately I did not realise the file options were ticket to single precision. Therefore I filtered the data and referenced to a single electrode, deleted bad segments of data and then saved, loaded the data and then ran ICA.<br>
<br>
I realise that pop runica converts to double precision, but would I have lost information in previous process of steps by having the 'single' default ticked?<br>
<br>
Do I therefore need to redo my analysis? And if so, how should I concert to double in code? And do I do it after every save, or after every computation?<br>
<br>
Best wishes,<br>
Jumana<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div></div>
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