Can i get a zml snippet to show a value that is generated by a function

Can i get a zml snippet to show a value that is generated by a function

Hi All,

Any help would be appreciated, i am trying to show the last record of data on a dashboard page and below is my code used but i don't think it will allow me.

Before you say i know the text value is incorrect, but i was trying different methods.

<%{
last_record = Digester_Data[ID>0] sort by Date_field desc;
a = last_record.Water_Temp;
{%>
<panel>
  <pr height='fill' width='fill'>
<pc width='100%' bgColor='#FFFFFF' padding='20px' hAlign='center' vAlign='middle'>
      <pr height='auto' width='auto'>
        <pc>
          <pr>
            <pc>
              <text value=a size='8' color='#FF4C2F' bold='true' textAlign='center' displayType='actual' decimalSeperator='.' numberScale='none'> </text>
            </pc>
          </pr>
          <pr>
            <pc>
              <text type='Text' value='Current Water Temp' size='3' color='#333333' textAlign='center'> </text>
            </pc>
          </pr>
        </pc>
      </pr>
    </pc>
  </pr>
</panel> 
<%}}%>