
204 Functions and commands
Example:
reduced_conic(x^2+2*x-2*y+1) returns
ref Performs Gaussian reduction of a matrix.
ref(Matrix)
Example:
ref returns
remove Given a vector or list, removes the occurrences of Value or
removes the values that make Test true and returns the
resulting vector or list.
remove(Value, List) or remove(Test, List)
Examples:
remove(5,{1,2,5,6,7,5}) returns {1,2,6,7}
remove(x→x≥5, [1 2 5 6 7 5]) returns [1 2]
reorder Given an expression and a vector of variables, reorders the
variables in the expression according to the order given in the
vector.
reorder(Expr, Vector)
Example:
reorder(x
2
+2*x+y
2
,[y,x]) gives y
2
+x
2
+2*x
residue Returns the residue of an expression at a value.
residue(Expr, Var, Value)
Example:
residue(1/z,z,0) returns 1
restart Purges all the variables.
restart(NULL)
resultant Returns the resultant (i.e. the determinant of the Sylvester
matrix) of two polynomials.
resultant(Poly1, Poly2, Var)
[][]
⋅+⋅⋅
−
⋅−+−+⋅−⋅+−
⋅+⋅⋅−⋅−+−⋅+
−
− xixxiyxxxxixxixy )(
2
1
)(11221.044
2
1
121
01
10
01
22
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