dyalog

Where can I learn APL?

I want to learn APL (more specifically Dyalog APL), but I can't seem to find any good sources to learn from. The only source I could find was Dyalog's Documentation Downloads, but other than that, can anyone recommend a good source? ...

How to increase variable precision in Dyalog APL?

I need to work with precision in Dyalog APL. I know the value of ⎕PP sets the precision, but I can't increase it over 18, so I can't get more precision than 18 digits and I need to operate with big numbers. Is there any way to increase precision? ...