[xsl] How to improve the performance of my matrix addition function?

Hi Folks,

My application uses lots of matrix operations. I used the SAXON Tool Profile 
(-TP) option to generate a web page that shows the performance of each of my 
matrix operations. I found that my matrix addition function is taking an 
appallingly large amount of time. Below is my matrix addition function. Do you 
have suggestions on ways to improve its performance?  /Roger

<!-- 
    A matrix can only be added to another matrix if the two matrices 
    have the same dimensions. To add two matrices, just add the 
    corresponding entries, and place this sum in the corresponding 
    position in the matrix which results.
-->
<xsl:function name="matrix:addition" as="element(Matrix)">
    <xsl:param name="M" as="element(Matrix)" />
    <xsl:param name="N" as="element(Matrix)" />
    <xsl:param name="name-of-result-matrix" as="xs:string" />
    
    <Matrix id="{$name-of-result-matrix}">
        <xsl:for-each select="1 to count($M/row)">
            <xsl:variable name="i" select="." as="xs:integer"/>
            <row>
                <xsl:for-each select="1 to count($M/row[$i]/col)">
                    <xsl:variable name="j" select="." as="xs:integer"/>
                    <col>
                        <xsl:value-of select="$M/row[$i]/col[$j] + 
$N/row[$i]/col[$j]"/>
                    </col>
                </xsl:for-each>
            </row>
        </xsl:for-each>
    </Matrix>
</xsl:function>
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