     suivant: Apply a bivariate function monter: Lists and vectors précédent: Product of elements of   Table des matières   Index

## Apply a function of one variable to the elements of a list : map apply of

map or apply or of applies a function to a list of elements.
of is the prefixed function equivalent to the parenthesis : Xcas translates f(x) internally to of(f,x). It is more natural to call map or apply than of. Be carefull with the order of arguments (that is required for compatibility reasons).
Note that apply returns a list ([]) even if the second argument is not a list.
Input :
apply(x->x`^`2,[3,5,1])
or
of(x->x`^`2,[3,5,1])
or
map([3,5,1],x->x`^`2)
or first define the function h(x) = x2, input :
h(x):=x`^`2
then
apply(h,[3,5,1])
or
of(h,[3,5,1])
or
map([3,5,1],h)
Output :
[9,25,1]
Next example, define the function g(x) = [x, x2, x3], input :
g:=(x)->[x,x`^`2,x`^`3]
then
apply(g,[3,5,1])
or
of(g,[3,5,1])
or
map([3,5,1],g)
Output :
[[3,9,27],[5,25,125],[1,1,1]]
Warning!!! first purge x if x is not symbolic.
Note that if l1,l2,l3 are lists sizes([l1,l2,l3]) is equivalent to map(size,[l1,l2,l3].     suivant: Apply a bivariate function monter: Lists and vectors précédent: Product of elements of   Table des matières   Index
giac documentation written by Renée De Graeve and Bernard Parisse