Ipopt is the solver engine, GAMS is the interface that let you use such engine (and many others) from an high-level point of view.<br>If you don't like gams, you can try other interfaces to ipopt or to other solver engines.<br>
<br>If you are looking for open source, you may want give a try to Pyomo or OpenOpt, but they are not documented so extensively like GAMS or AMPL.<br><br>Antonello<br><br><div class="gmail_quote">2013/2/25 Gaspar Núñez <span dir="ltr"><<a href="mailto:nuroga@yahoo.com" target="_blank">nuroga@yahoo.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-size:12pt;font-family:times new roman,new york,times,serif"><div>hi</div><div><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
i´m an economist and<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">i´ve been using ipopt with GAMS</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
to solve large squared nonlinear systems of equations</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
but i'd like not to use GAMS anymore</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">but some free open source software or interface</div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
i will very much appreciate every piece of help</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">to do this in the easiest possible way</div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">using a programming language similar to that of GAMS if possible <br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
since i´m not a programmer and not an expert on implementing algorithms</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
thankyou very much</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
gaspar<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">on <br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:times new roman,new york,times,serif"></div></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Antonello Lobianco<br>INRA, Laboratoire d'Economie Forestière<br>14 Rue Girardet - 54000 Nancy, France<br>Tel: +33.652392310<br>Email: <a href="mailto:antonello.lobianco@nancy-engref.inra.fr" target="_blank">antonello.lobianco@nancy-engref.inra.fr</a><br>
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