`digits`

Sets or reports the precision, in decimal digits, used by vpa.

Category: Mathematics > Numbers and Precision

Syntax

digits

Prints the current precision (32 by default).

digits(d)

Sets the precision to d decimal digits.

d = digits

Returns the current precision as a double.

Description

digits controls how many significant digits vpa uses for variable-precision arithmetic. The setting is global for the session, so changing it affects every later vpa call that does not give its own precision. A larger value gives more accurate results at the cost of speed.

The precision of vpa(x, d) with an explicit d overrides the global value for that call only. An argument that is not a positive integer is an error.

Input arguments

d: Positive integer number of significant decimal digits.

Output arguments

d: The current number of digits, as a double.

Example

Change the precision

digits(10);
vpa(sym(pi))
d = digits
digits(32);
vpa(sym(pi))

Output

ans = 3.141592654
d = 10
ans = 3.1415926535897932384626433832795

digits