up previous next
E_

canonical vector
Syntax 

E_(K:INT, N:INT or MODULE):VECTOR

Description
If N is an integer, this function returns the K-th canonical vector of the free module of rank N over the current ring. If N is a module, it returns the K-th canonical vector of N.

Example 
  Use R ::= QQ[x,y];
  E_(4,7);
Vector(0, 0, 0, 1, 0, 0, 0)
-------------------------------
  M := Module([x^2,0,y^2],[x^3,x+y,y^3]);
  E_(2, M);
Vector(0, 1, 0)
-------------------------------