Rounding a template var.

[leefish]

I am working on presenting some threadfield results in a star format (like the rating system) and I am struggling on the rounding of the outputted values. I need them to be a number like 1.5 or 2 or 2.5 etc, but I cannot figure out the correct conditional to do this.

This is my code so far:

Code:

<setvar q>$GLOBALS['threadfields']['pfrating1']+$GLOBALS['threadfields']['pfrating2']+$GLOBALS['threadfields']['pfrating2']</setvar>

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The values for the threadfields are 3, 3 and 2 which gives me a result of 8.
I then divided 8 by 3

Code:

<setvar r>$tplvars['q']/3</setvar>

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and that gave me a result of 2.66666667 and it is this number I want to round to 2.5.

I tried the code below but it just gave no output. I was hoping it would round it to the decimal point.

Code:

<?=round("$tplvars['r']",1)?>

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All help appreciated.