<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="">Dear All,<div class=""><br class=""></div><div class=""> According to the document, function igradsF() can compute an array given the gradients in x and y directions. I hope to reconstruct the original variable that produces these gradients with the procedure gradsf. How can I do it? and what is the detailed formula of the function igradsF()? Thanks a lot.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Best regards,</div><div class=""><br class=""></div><div class="">Xuguang Sun</div><div class=""><br class=""></div></body></html>