Error with chart series

Question

Hi everyone!
I have a problem with charts with multiple series.
If the series are incomplete (with lacks of data for some columns), the values lose the right correspondence with the column.
How can I deal with this?
Thank so...
DrPlexi
Maybe an example would be clarifying, i attach here the xml data and two charts' xml:
<ROWSET>
<ROW>
<series>5</series>
<col_names>300C</col_names>
<values>71.91701276542868</values>
</ROW>
<ROW>
<series>3</series>
<col_names>300C</col_names>
<values>20.48012540803013</values>
</ROW>
<ROW>
<series>Wagon</series>
<col_names>300C</col_names>
<values>7.600472191820757</values>
</ROW>
<ROW>
<series>2</series>
<col_names>300C</col_names>
<values>0.0023896347204366342</values>
</ROW>
<ROW>
<series>5</series>
<col_names>DODGE</col_names>
<values>65.13503987886224</values>
</ROW>
<ROW>
<series>Wagon</series>
<col_names>DODGE</col_names>
<values>15.728327698513192</values>
</ROW>
<ROW>
<series>2</series>
<col_names>DODGE</col_names>
<values>14.781938987298812</values>
</ROW>
<ROW>
<series>3</series>
<col_names>DODGE</col_names>
<values>4.354693435325753</values>
</ROW>
<ROW>
<series>5</series>
<col_names>HUMMER</col_names>
<values>43.14889344162732</values>
</ROW>
<ROW>
<series>Wagon</series>
<col_names>HUMMER</col_names>
<values>27.14205893546898</values>
</ROW>
<ROW>
<series>2</series>
<col_names>HUMMER</col_names>
<values>13.45361200411366</values>
</ROW>
<ROW>
<series>3</series>
<col_names>HUMMER</col_names>
<values>8.480779975868687</values>
</ROW>
<ROW>
<series>4</series>
<col_names>HUMMER</col_names>
<values>7.7746556429213465</values>
</ROW>
<ROW>
<series>5</series>
<col_names>CHEVY</col_names>
<values>74.89464972938943</values>
</ROW>
<ROW>
<series>3</series>
<col_names>CHEVY</col_names>
<values>25.105350270610575</values>
</ROW>
<ROW>
<series>3</series>
<col_names>CADILLAC</col_names>
<values>39.497342869700724</values>
</ROW>
<ROW>
<series>5</series>
<col_names>CADILLAC</col_names>
<values>64.38519904375845</values>
</ROW>
<ROW>
<series>Wagon</series>
<col_names>JEEP</col_names>
<values>60.66246011233522</values>
</ROW>
<ROW>
<series>5</series>
<col_names>JEEP</col_names>
<values>39.33753988766478</values>
</ROW>
</ROWSET>
And here's the xml of two charts (both showing wrong results):
chart:
<Graph graphType="LINE_VERT_ABS">
<Title text="" visible="true" horizontalAlignment="CENTER"/>
<LocalGridData colCount="{count(xdoxslt:group(.//ROW, 'col_names'))}" rowCount="{count(xdoxslt:group(.//ROW, 'series'))}">
<RowLabels>
<xsl:for-each-group xmlns:xsl="http://www.w3.org/1999/XSL/Transform" select=".//ROW" group-by="series">
<Label>
<xsl:value-of select="current-group()/series"/>
</Label>
</xsl:for-each-group>
</RowLabels>
<ColLabels>
<xsl:for-each-group xmlns:xsl="http://www.w3.org/1999/XSL/Transform" select=".//ROW" group-by="col_names">
<Label>
<xsl:value-of select="current-group()/col_names"/>
</Label>
</xsl:for-each-group>
</ColLabels>
<DataValues>
<xsl:for-each-group xmlns:xsl="http://www.w3.org/1999/XSL/Transform" select=".//ROW" group-by="series">
<RowData>
<xsl:for-each-group select="current-group()" group-by="col_names">
<Cell>
<xsl:value-of select="sum(current-group()/values)"/>
</Cell>
</xsl:for-each-group>
</RowData>
</xsl:for-each-group>
</DataValues>
</LocalGridData>
</Graph>
chart:
<Graph type="BAR_VERT_PERCENT">
<Title text="" visible="true" horizontalAlignment="CENTER"/>
<LocalGridData colCount="{count(xdoxslt:group(.//ROW, 'col_names'))}" rowCount="{count(xdoxslt:group(.//ROW, 'series'))}">
<RowLabels>
<xsl:for-each-group xmlns:xsl="http://www.w3.org/1999/XSL/Transform" select=".//ROW" group-by="series">
<Label>
<xsl:value-of select="current-group()/series"/>
</Label>
</xsl:for-each-group>
</RowLabels>
<ColLabels>
<xsl:for-each-group xmlns:xsl="http://www.w3.org/1999/XSL/Transform" select=".//ROW" group-by="col_names">
<Label>
<xsl:value-of select="current-group()/col_names"/>
</Label>
</xsl:for-each-group>
</ColLabels>
<DataValues>
<xsl:for-each-group xmlns:xsl="http://www.w3.org/1999/XSL/Transform" select=".//ROW" group-by="series">
<RowData>
<xsl:for-each-group select="current-group()" group-by="col_names">
<Cell>
<xsl:value-of select="sum(current-group()/values)"/>
</Cell>
</xsl:for-each-group>
</RowData>
</xsl:for-each-group>
</DataValues>
</LocalGridData>
</Graph>

Answer 1

I was having the same error while trying to plot a moving average across 7 days. The work around I found was rather simple.
If you right click your report in the solution explorer and select "View Code" it will give you the underlying XML of the report. Find the entry for the value of your calculated series and enter a formula to dynamically create your periods.
<ChartFormulaParameter Name="Period">
                  <Value>=IIf(Count(Fields!Calls.Value) >= 7 ,7, (Count(Fields!Calls.Value)))</Value>
</ChartFormulaParameter>
What I'm doing here is getting the row count of records returned in the chart. If the returned rows are greater than or equal to 7 (The amount of days I want the average) it will set the points to 7. If not, it will set the number to the amount of returned rows. So far this has worked great. I'm probably going to add more code to handle no records returned although in my case that shouldn't happen but, you never know.
A side note:
If you open the calculated series properties in the designer, you will notice the number of periods is set to "0". If you change this it will overwrite your custom formula in the XML.