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Hi Valeria,
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<div class="">It’s a bit of an open door, but you get this message, because "<span style="font-family: Calibri, sans-serif; font-size: 11pt;" class="">Matrix is close to singular or badly scaled</span><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class="">”.</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class=""><br class="">
</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class="">That means that the outcome of the algorithm is not necessarily to be trusted. I have no clue what causes this, because I don’t have information
about your data, nor about the line where this occurs. If things like these happen, my recommendation always is to look at the output on the screen (often matlab prints a line number and a function filename to give you a clue of the problematic line). If you
manage to find this information, you can set a breakpoint in the code at exactly that location, and inspect the variables that go into the computation that occurs on the guilty line. If the guilty line is not easily found, then there’s no other way than setting
a breakpoint early in the code and going through it step-by-step.</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class=""><br class="">
</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class="">I assume that you are familiar with the matlab debugger. If not, it’s time to get acquainted. To get started, I think that google and youtube are
your friends.</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class=""><br class="">
</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class="">Best wishes,</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class="">Jan-Mathijs</span></font></div>
<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class=""><br class="">
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<div class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 14.666666984558105px;" class=""><br class="">
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<blockquote type="cite" class="">
<div class="">On 30 Aug 2022, at 10:48, Valeria Jaramillo via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Hi<o:p class=""></o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
I tried to run ft_scalpcurrentdensity on my 128-channel EEG data (Cz recording reference) to estimate scalp current density using the surface Laplacian. When I ran it, I received this warning message:<o:p class=""></o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 3.554116e-08.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Do you have any idea why I get this message and should I be concerned about it?<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Thanks,<o:p class=""></o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Valeria<o:p class=""></o:p></div>
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<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">fieldtrip
mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!6S1TL1fqf3l8sz54dl_LyivB7SRHJ4CL-vxCcXQYtc3Uyk8Hrg4lStzwzRFH344m8QIxDEbPL5oYx-xbOPWrolAVffSgdtMYJX4cMA$" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!6S1TL1fqf3l8sz54dl_LyivB7SRHJ4CL-vxCcXQYtc3Uyk8Hrg4lStzwzRFH344m8QIxDEbPL5oYx-xbOPWrolAVffSgdtMYJX4cMA$</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span> </span></div>
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