conf, set_conf
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conf, set_conf

conf, set_conf — query and set confidence factors.

Synopsis

conf (s_exp)
set_conf (s_exp, number|s_exp)

Arguments

s_exp

Any Gamma or Lisp expression.

number|s_exp

Any number, or any expression that evaluates to a number. Non-numbers are treated as zero.

Returns

The confidence factor of the number or s_exp.

Description

All Gamma and Lisp expressions in Gamma have an associated confidence factor between 0 and 100 which may be queried using the conf function. This is typically 100, or fully confident. Exceptions arise only when the user explicitly sets the confidence to another value, or when the DataHub instance provides a confidence value to the interpreter. The set_conf function will set the confidence of an expression to any numerical value, though legal values are between 0 and 100. Numbers less than 0 indicate indeterminate confidence. Numbers greater than 100 will produce strange results.

Example

Gamma> x = 3;
3
Gamma> set_conf(x, 40);
40
Gamma> conf(x);
40
Gamma>
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