In article <39A2016F.7B1ED0D2@usb.ve>, jac### [at] usbve wrote:

> Sorry, there is a simpler solution. Replace the previous macro by
...snip...
> No restriction in the domain of definition

You don't need a macro for this, a plain old function will do fine.

#declare Heaviside = function {if(x - y, 1, 0)}
// x=the value, y=the jump threshold, z=nothing

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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