subPoint -- This function evaluates a polynomial or matrix at a point.

Synopsis

• Usage:

  subPoint(f,v,p)

• Inputs:
  • f, a thing, A polynomial or a matrix.
  • v, a list, List of variables that we will be evaluated at the point.
  • p, a thing, A point or a list of coordinates or a matrix.
• Optional inputs:
  • M2Precision (missing documentation) => ..., default value 53,
  • SpecifyVariables (missing documentation) => ..., default value false,
  • SubIntoCC (missing documentation) => ..., default value false,

Description

i1 : R=CC[x,y,z]

o1 = R

o1 : PolynomialRing

i2 : f=z*x+y

o2 = x*z + y

o2 : R

i3 : subPoint(f,{x,y},{.1,.2})

o3 = .1z + .2

o3 : R

i4 : subPoint(f,{x,y,z},{.1,.2,.3},SpecifyVariables=>{y})

o4 = x*z + .2

o4 : R

i5 : R=CC_200[x,y,z]

o5 = R

o5 : PolynomialRing

i6 : f=z*x+y

o6 = x*z + y

o6 : R

i7 : subPoint(f,{x,y,z},{.1,.2,.3},SubIntoCC=>true)

o7 = .23

o7 : CC (of precision 53)

i8 : subPoint(f,{x,y,z},{.1234567890123456789012345678901234567890p200,
             0,1},SubIntoCC=>true,M2Precision=>200)

o8 = .123456789012345678901234567890123456789

o8 : CC (of precision 200)

Caveat