Symbolic Math Toolbox

vpa

Variable precision arithmetic

Syntax

• R = vpa(A)
  R = vpa(A,d)
  

Description

vpa(A) uses variable-precision arithmetic (VPA) to compute each element of A to d decimal digits of accuracy, where d is the current setting of digits. Each element of the result is a symbolic expression.

vpa(A,d) uses d digits, instead of the current setting of digits.

Examples

The statements

• digits(25)
  q = vpa(sin(sym('pi')/6))
  p = vpa(pi)
  w = vpa('(1+sqrt(5))/2')
  

return

• q =
  .5000000000000000000000000
  
  p = 3.141592653589793238462643
  
  w =
  1.618033988749894848204587
  

vpa pi 75 computes to 75 digits.

The statements

• A = vpa(hilb(2),25)
  B = vpa(hilb(2),5)
  

return

• A =
  [                        1., .5000000000000000000000000]
  [.5000000000000000000000000, .3333333333333333333333333]
  
  B =
  [    1., .50000]
  [.50000, .33333]
  

See Also
digits, double

triu

zeta