fnormal(e, digits, epsilon)
algebraic expression, or a list, set, relation, series, or range of algebraic expressions
(optional) number of digits for floating-point evaluation (defaults to the value of the global variable Digits)
(optional) error tolerance for ``fuzzy zero'' (defaults to the value Float(1,-digits+2))
The value returned by fnormal is an expression equivalent to e under the assumption that all numeric values with magnitude less than epsilon may be considered to be zero.
In addition, all floats in e which remain nonzero are converted to floats with digits precision.
fnormal preserves numeric type and sign information as much as possible. Thus, for example, fnormal(1e-20*I, 10) = 0.*I not 0. . This ensures that branching behavior is generally not affected by fnormal. Use simplify(expr, zero) to remove 0 real or imaginary parts of complex floating point numbers.
If e is a list, set, range, series, equation, or relation, then fnormal is applied recursively to the components of e.
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