subf¶

symbolic subtraction

Calling Sequence¶

["c"]=subf("a","b")

:”a”,”b”,”c” strings :

returns the character string c`= `”a-b” Trivial simplifications such as subf(“0”,”a”) or subf(“1”,”2”) are performed.

subf('0','a')
subf('2','1')
subf('a','0')