one useful way is to use a matrix_indirect object in which with another integer matrix you can specifiy each row and column that you need.<br><br><br><div class="gmail_quote">On Mon, Jul 12, 2010 at 23:57, Kraus Philipp <span dir="ltr">&lt;<a href="mailto:philipp.kraus@flashpixx.de">philipp.kraus@flashpixx.de</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div style="word-wrap: break-word;">Hi,<div><br></div><div>I have a NxM matrix and I would like to extract some rows / columns. I have try to use the matrix_slice command, but I need specify only the rows / columns and need the full range for columns / rows:</div>

<div><br></div><div>For illustrating (not syntactic correct):</div><div><br></div><div>unsigned int rows[5];</div><div>// dynamic fill rows[i]</div><div><span style="color: rgb(0, 116, 0); font-family: Monaco; font-size: 12px;"><br>

</span></div><div><span style="color: rgb(0, 116, 0); font-family: Monaco; font-size: 12px;">ublas::matrix_slice&lt; ublas::matrix&lt;double&gt; &gt; extract(mymatrix, ublas::slice(rows), ublas::range(0, mymatrix::size2()-1));</span></div>

<div><span style="color: rgb(0, 116, 0); font-family: Monaco; font-size: 12px;"><br></span></div><div><span style="color: rgb(0, 116, 0); font-family: Monaco; font-size: 12px;">// create </span></div><div><span style="color: rgb(0, 116, 0); font-family: Monaco; font-size: 12px;">ublas::matrix&lt;double&gt; newmatrix = extract;</span></div>

<div><span style="color: rgb(0, 116, 0); font-family: Monaco; font-size: 12px;"><br></span></div><div><font color="#007400" face="Monaco">How can I create a new matrix with the full row / column range from some columns / rows?</font></div>

<div><font color="#007400" face="Monaco"><br></font></div><div><font color="#007400" face="Monaco">Thanks</font></div><div><font color="#007400" face="Monaco"><br></font></div><div><font color="#007400" face="Monaco">Phil</font></div>

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