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Hello Jon,<br>
<br>
as I understand that correctly, if IPOPT detects a position in the
matrix that you mention twice in the row and column vectors of the
triplets it sums up the entries in the value vectors later on.<br>
<br>
This might come in hand if you have a well structured problem (eg
block structure) but some entries overlap with other blocks (think
of coupling constraints).<br>
<br>
This is how I understand that part of the documentation. If I am
completely wrong please correct me, I am just trying to take
advantage of this special feature in my next optimization problem
formulation.<br>
<br>
Chrees<br>
Christian<br>
<br>
<div class="moz-cite-prefix">Am 29.05.2015 um 12:57 schrieb Jonathan
Gan:<br>
</div>
<blockquote
cite="mid:CA+JW58iJ7-BUua44GF7FDsxKVPCXATyvEeixTd9Enu_tV5Rp7g@mail.gmail.com"
type="cite">
<p dir="ltr">It is mentioned in the documentation that multiple
entries might occur for the triplet format for matrix
representation for some nonzero positions. What is intended
with "the values provided for those positions are added"?</p>
<p dir="ltr">Does it mean the value for that particular nonzero
position with multiple entries should be arithmetically added?
Or should it be overwritten with a later occurring entry?</p>
<p dir="ltr">Cheers,<br>
Jon</p>
<br>
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