<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:12pt"><div style="" class=""><span style="" class="">Dear GRASS GIS developers,</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br style="" class=""><span style="" class=""></span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span><span style="" class="">I am planning to use v.perturb to run a spatial simulated annealing exercise. Two drawbacks with </span><span style="" class="">v.perturb exist. First, "</span><span>output vector points are not guaranteed to be contained within the
current geographic region</span>". Second, all vector points are perturbed together.</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span><br></span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>Is it </span><span>very difficult to solve this issues?</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span><br></span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>Another option for perturbation would be v.edit, but
in that case the direction and distance are not random.</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: italic;"><br></div><div class="" style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: italic;">Best,<br></div><div style="" class=""> </div><div style="" class="">Alessandro Samuel-Rosa
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<br style="" class="">Graduate School in Agronomy - Soil Science
<br style="" class="">Federal Rural University of Rio de Janeiro
<br style="" class="">Seropédica, Rio de Janeiro, Brazil
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<br style="" class="">Guest Researcher at ISRIC - World Soil Information
<br style="" class="">Wageningen, the Netherlands
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<br style="" class="">Homepage: soil-scientist.net Skype: alessandrosamuel</div></div></body></html>