[amibroker] Is there a way to calculate the ticker symbol tick size automatically?

[wooziwog]

I have tried to determine a way to calculate or get the tick size for 
a ticker automatically to use for the following functions:

TickSize=0.25; (I want to automatically calculate this)

function tickdn(array)
{
return (floor(array/TickSize)*TickSize);
}
function tickup(array)
{
return (ceil(array/TickSize)*TickSize);

It seems there should be a way to automatically determine the tick 
size (for Forex and Future ticker symbols) but I am drawing blanks 
and have not been able to find any solutions in the library or 
knowledgebase.

Any help will be appreciated.

Thanks,

David K.