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[xsl] Calculating a Moving Average

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G'day,

I am trying to calculate a moving average based on the below XML, according to
a number of days parameter. Ie 20 day moving average, would sum the last
(starting at the end 20040528) 20 days closing price <cl> and divide by 20.

<xsl:param name="varDays" select="0" />
<xsl:variable name="varTotalMA" select="sum(day[(last() - $varDays) and
last()]/cl)" />

<xsl:variable name="varMA" select="$varTotalMA / $varDays" />

Any help appreciated

John

	<asx id="AAC" coy="AUSTRALIAN AGRICULTURAL COMPANY LIMITED."
sector="Food Beverage &amp; Tobacco" asxNo="ASX300" currHi="122" currOp="121"
currCl="120" currVol="113728" currDate="20040528">
		<day id="20040329" weekno="1">
			<op>116</op>
			<hi>116</hi>
			<lo>114</lo>
			<cl>114</cl>
			<vol>73200</vol>
		</day>
		<day id="20040330" weekno="1">
			<op>114</op>
			<hi>115</hi>
			<lo>114</lo>
			<cl>115</cl>
			<vol>73745</vol>
		</day>
		<day id="20040331" weekno="1">
			<op>115</op>
			<hi>115</hi>
			<lo>113</lo>
			<cl>113</cl>
			<vol>262756</vol>
		</day>
		<day id="20040401" weekno="1">
			<op>114</op>
			<hi>114</hi>
			<lo>113</lo>
			<cl>114</cl>
			<vol>95200</vol>
		</day>
		<day id="20040402" weekno="1">
			<op>114</op>
			<hi>114</hi>
			<lo>113</lo>
			<cl>113</cl>
			<vol>198992</vol>
		</day>
		<day id="20040405" weekno="2">
			<op>113</op>
			<hi>116</hi>
			<lo>113</lo>
			<cl>116</cl>
			<vol>643913</vol>
		</day>
		<day id="20040406" weekno="2">
			<op>116</op>
			<hi>116</hi>
			<lo>115</lo>
			<cl>116</cl>
			<vol>421525</vol>
		</day>
		<day id="20040407" weekno="2">
			<op>116</op>
			<hi>116</hi>
			<lo>115</lo>
			<cl>116</cl>
			<vol>351438</vol>
		</day>
		<day id="20040408" weekno="2">
			<op>116</op>
			<hi>116</hi>
			<lo>114</lo>
			<cl>116</cl>
			<vol>154881</vol>
		</day>
		<day id="20040409" weekno="2">
			<op>116</op>
			<hi>116</hi>
			<lo>116</lo>
			<cl>116</cl>
			<vol>0</vol>
		</day>
		<day id="20040413" weekno="3">
			<op>116</op>
			<hi>117</hi>
			<lo>115</lo>
			<cl>115</cl>
			<vol>127715</vol>
		</day>
		<day id="20040413" weekno="3">
			<op>116</op>
			<hi>117</hi>
			<lo>115</lo>
			<cl>115</cl>
			<vol>127715</vol>
		</day>
		<day id="20040414" weekno="3">
			<op>115</op>
			<hi>116</hi>
			<lo>115</lo>
			<cl>116</cl>
			<vol>133444</vol>
		</day>
		<day id="20040415" weekno="3">
			<op>114</op>
			<hi>115</hi>
			<lo>113</lo>
			<cl>114</cl>
			<vol>218466</vol>
		</day>
		<day id="20040416" weekno="3">
			<op>114</op>
			<hi>114</hi>
			<lo>113</lo>
			<cl>114</cl>
			<vol>151423</vol>
		</day>
		<day id="20040419" weekno="4">
			<op>113</op>
			<hi>114</hi>
			<lo>113</lo>
			<cl>113</cl>
			<vol>79202</vol>
		</day>
		<day id="20040420" weekno="4">
			<op>114</op>
			<hi>115</hi>
			<lo>113</lo>
			<cl>115</cl>
			<vol>151972</vol>
		</day>
		<day id="20040421" weekno="4">
			<op>114</op>
			<hi>114</hi>
			<lo>113</lo>
			<cl>113</cl>
			<vol>125633</vol>
		</day>
		<day id="20040422" weekno="4">
			<op>114</op>
			<hi>119</hi>
			<lo>113</lo>
			<cl>118</cl>
			<vol>744055</vol>
		</day>
		<day id="20040423" weekno="4">
			<op>118</op>
			<hi>119</hi>
			<lo>118</lo>
			<cl>118</cl>
			<vol>513601</vol>
		</day>
		<day id="20040426" weekno="5">
			<op>118</op>
			<hi>118</hi>
			<lo>117</lo>
			<cl>117</cl>
			<vol>198288</vol>
		</day>
		<day id="20040427" weekno="5">
			<op>118</op>
			<hi>118</hi>
			<lo>117</lo>
			<cl>117</cl>
			<vol>191337</vol>
		</day>
		<day id="20040428" weekno="5">
			<op>118</op>
			<hi>120</hi>
			<lo>118</lo>
			<cl>118</cl>
			<vol>323800</vol>
		</day>
		<day id="20040429" weekno="5">
			<op>118</op>
			<hi>119</hi>
			<lo>117</lo>
			<cl>119</cl>
			<vol>260638</vol>
		</day>
		<day id="20040430" weekno="5">
			<op>119</op>
			<hi>119</hi>
			<lo>117</lo>
			<cl>118</cl>
			<vol>163400</vol>
		</day>
		<day id="20040503" weekno="6">
			<op>119</op>
			<hi>119</hi>
			<lo>117</lo>
			<cl>118</cl>
			<vol>123565</vol>
		</day>
		<day id="20040504" weekno="6">
			<op>117</op>
			<hi>120</hi>
			<lo>117</lo>
			<cl>120</cl>
			<vol>470247</vol>
		</day>
		<day id="20040505" weekno="6">
			<op>120</op>
			<hi>124</hi>
			<lo>120</lo>
			<cl>124</cl>
			<vol>1646033</vol>
		</day>
		<day id="20040506" weekno="6">
			<op>124</op>
			<hi>124</hi>
			<lo>122</lo>
			<cl>122</cl>
			<vol>191631</vol>
		</day>
		<day id="20040507" weekno="6">
			<op>122</op>
			<hi>123</hi>
			<lo>122</lo>
			<cl>122</cl>
			<vol>179778</vol>
		</day>
		<day id="20040510" weekno="7">
			<op>122</op>
			<hi>122</hi>
			<lo>120</lo>
			<cl>121</cl>
			<vol>474624</vol>
		</day>
		<day id="20040511" weekno="7">
			<op>121</op>
			<hi>122</hi>
			<lo>121</lo>
			<cl>122</cl>
			<vol>148610</vol>
		</day>
		<day id="20040512" weekno="7">
			<op>122</op>
			<hi>123</hi>
			<lo>122</lo>
			<cl>122</cl>
			<vol>84962</vol>
		</day>
		<day id="20040513" weekno="7">
			<op>121</op>
			<hi>121</hi>
			<lo>119</lo>
			<cl>119</cl>
			<vol>153598</vol>
		</day>
		<day id="20040514" weekno="7">
			<op>119</op>
			<hi>120</hi>
			<lo>118</lo>
			<cl>120</cl>
			<vol>58598</vol>
		</day>
		<day id="20040517" weekno="8">
			<op>119</op>
			<hi>119</hi>
			<lo>118</lo>
			<cl>119</cl>
			<vol>145304</vol>
		</day>
		<day id="20040518" weekno="8">
			<op>118</op>
			<hi>120</hi>
			<lo>117</lo>
			<cl>120</cl>
			<vol>425565</vol>
		</day>
		<day id="20040519" weekno="8">
			<op>120</op>
			<hi>121</hi>
			<lo>120</lo>
			<cl>120</cl>
			<vol>91171</vol>
		</day>
		<day id="20040520" weekno="8">
			<op>121</op>
			<hi>121</hi>
			<lo>120</lo>
			<cl>121</cl>
			<vol>218439</vol>
		</day>
		<day id="20040521" weekno="8">
			<op>121</op>
			<hi>121</hi>
			<lo>120</lo>
			<cl>120</cl>
			<vol>80331</vol>
		</day>
	</asx>

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