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Trying to perform averages on columns

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By: Alan Shiers - ashiers

Trying to perform averages on columns

2005-05-27 07:56

Hi there,


I'm new to JasperReports and trying to understand how it works. I'm trying to figure out what I'm doing wrong with my xml file. I'm using the OpenReports Designer to help me design the xml file but not getting much help on using the application. Perhaps someone here can help.


I declared a variable and referenced one of the fields from the database named Q2 and set the calculation element to "Average". Then in the columnFooter band I set a textField that calls the variable Q2Average to perform the average calculation on the column.



<field name="Q2" class="java.lang.Byte">



<variable name="Q2Average" class="java.lang.Integer" calculation="Average">





<band height="20">

<textField evaluationTime="Report">

<reportElement positionType="Float" isPrintRepeatedValues="false" x="120" y="2" width="26" height="17"/>


<font fontName="sansserif" size="12" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false" pdfFontName="Helvetica" pdfEncoding="Cp1252" isPdfEmbedded="false"/>


<textFieldExpression class="java.lang.String"><![CDATA[$V{Q2Average} + "%"]]></textFieldExpression>





Problem is, when I test it out, OpenReports Designer throws up an error message that states:


Error Evaluating Expression: variable_Q2Average

SourceText: $F{Q2}


I don't get it. What does it mean? What does it want me to do to fix it?


Please Advise,


Alan Shiers





By: Alan Shiers - ashiers

RE: Trying to perform averages on columns

2005-05-27 11:43

Ok, I've figured out my problem. No need to repond to this post.





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