<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Salim,<div class=""><br class=""></div><div class=""> The Chimera MRC file writer puts the minimum, maximum and mean value of exactly the grid values that are being written to the MRC file. So for instance if you are writing out a subvolume of a bigger map, the min, max, mean are not the values for the bigger map, they are the values for the subvolume. Likewise if you write a subsampled map where only every other data value is included along each axis, then only those values are included in the min, max, mean.</div><div class=""><br class=""></div><div class=""> Here is the Chimera code that writes MRC:</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="http://plato.cgl.ucsf.edu/trac/chimera/browser/trunk/libs/VolumeData/mrc/writemrc.py" class="">http://plato.cgl.ucsf.edu/trac/chimera/browser/trunk/libs/VolumeData/mrc/writemrc.py</a></div><div class=""><br class=""></div><div class=""> Tom</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 13, 2017, at 11:59 AM, SALIM SAZZED wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hello,<div class="">I am a Ph.D. student of Computer Science department at Old Dominion University, USA. I am using Chimera for my research. Can you please tell me how Chimera calculates <b class="">DMIN, DMAX, DMEAN </b>value of MRC header after chopping a portion of original MRC/MAP<b class="">?</b></div><div class=""><br class=""></div><div class="">My understanding about that-</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><b class="">DMIN: T</b>he minimum density value of the voxels in the MRC/MAP Cube.<b class=""><br class=""></b></div><div class=""><br class=""></div><div class=""><b class="">DMAX: T</b>he maximum density value of the voxels in the MRC/MAP Cube.<br class=""></div><div class=""><br class=""></div><div class=""><b class="">DMEAN: </b>The average density of voxels (add all the voxels density value and divide it by the number of voxels).<br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">It will be really helpful if you clarify.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Thanks</div><div class="">Salim Sazzed </div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></div>
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