<div dir="auto">Just for the record, "mod" of a floating point number should be properly documented.</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, 7 Oct 2025, 18:53 Daniel Baston via gdal-dev, <<a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">It's fairly straightforward to define functions in C++ and register them with muparser. You can see how we do this with "isnan" and "isnodata" here:<div><br></div><div><a href="https://github.com/OSGeo/gdal/blob/ca7a2d38893a8d6cdc03653b47712f4442d99d65/frmts/vrt/vrtexpression_muparser.cpp#L27" target="_blank" rel="noreferrer">https://github.com/OSGeo/gdal/blob/ca7a2d38893a8d6cdc03653b47712f4442d99d65/frmts/vrt/vrtexpression_muparser.cpp#L27</a></div><div><br></div><div>I don't think we want too many custom functions, but adding "mod" seems like a good idea.</div><div><br></div><div>Dan</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 7, 2025 at 12:30 PM Scott via gdal-dev <<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank" rel="noreferrer">gdal-dev@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Greetings!<br>
<br>
I've been unable to find a modulo operator in CLI calc. It's not in the <br>
muparser functions or appear to be in the forth-coming 3.12 C pixel <br>
functions.<br>
<br>
This has been working with muparser, but it's messy every time you need <br>
a simple modulo. pixel is real or int, div is int:<br>
<br>
rint(pixel) - (rint(rint(pixel) / div) * div)<br>
<br>
Am I missing something? If not, consider this a feature request! :)<br>
<br>
Thanks!<br>
Scott<br>
<br>
-- <br>
<a href="http://www.postholer.com" rel="noreferrer noreferrer" target="_blank">www.postholer.com</a><br>
<br>
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