Subject: Re: [xsl] Filtering Numeric Output with Changing Parameter From: Joerg Heinicke <joerg.heinicke@xxxxxx> Date: Sat, 20 Jul 2002 02:50:22 +0200 |
<xsl:template match="root"> <root> <xsl:apply-templates select="stock[1]"/> </root> </xsl:template>
<xsl:template match="stock"> <xsl:variable name="threshold" select="1"/> <xsl:copy-of select="."/> <xsl:apply-templates select="following-sibling::stock [price >= current()/price + $threshold or price <= current()/price - $threshold][1]"/> </xsl:template>
I'd like to take a pile of numeric data and filter it down to a smaller pile by selecting for output only values that change by more than a threshold amount from the beginning value. If a value gets selected for
output, then the next output value would have to be different from it by
more than the threshold. For example, say I have a pile of stock price data and I want to plot only values that change by more than 1.00. If the first value is 27.50, then I want to look through the data and ignore it until I find a price >= 28.50 or <= 26.50. If I find a price of 28.50, then I want to continue my search, but now I am looking for prices >= 29.50 or <= 27.50.
So given:
<stock> <time>0.0</time> <price>27.50</price> </stock> <stock> <time>1.0</time> <price>27.75</price> </stock> <stock> <time>3.0</time> <price>27.20</price> </stock> <stock> <time>4.0</time> <price>28.50</price> </stock> <stock> <time>5.0</time> <price>28.25</price> </stock> <stock> <time>6.0</time> <price>27.75</price> </stock> <stock> <time>7.0</time> <price>27.80</price> </stock> <stock> <time>8.0</time> <price>25.50</price> </stock>
I want:
<stock> <time>0.0</time> <price>27.50</price> </stock> <stock> <time>4.0</time> <price>28.50</price> </stock> <stock> <time>8.0</time> <price>25.50</price> </stock>
I understand that I cannot use a for-each loop because the value of my comparison "variables" needs to be variable. I also understand that I need to use recursion to do it. However, I struggle mightily with procedural programming, so functional programming and recursion chew me up and spit me out.
Any guidance would be appreciated. An actual named template to get this job done would be even more wondeful!
TIA,
Tim Lewis
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