6.3.17 Sorting
The sort command
sorts lists and expression in various ways.
-
sort takes one mandatory argument and one optional
argument:
-
L, a list or expression.
- Optionally, f, a boolean function of two variables
(by default, f if the function (x,y) -> x<=y).
- sort(L,f) (for a list L) returns a copy of
L sorted according to the order given by f. By default, this
means that it will be sorted in increasing order.
- sort(L,f) (for an expression L) returns a copy of
L with the terms in sums and products collected and sorted.
Note that using (x,y)->x>=y for f will
to sort the list in decreasing order.
This may also be used to sort a list of lists
(that sort with one argument does not know how to sort).
Examples
| sort(exp(2*ln(x))+x*y-x+y*x+2*x) |
| simplify(exp(2*ln(x))+x*y-x+y*x+2*x) |
| sort([3,4,2],(x,y)->x>=y) |