(1) The common logarithm of a positive number A can generally be written as log A = n + log A ', where n is an integer and log A ' is the positive fractional part, 0≦ log A '<1. In this case, the integer part n is called the index or characteristic, and the fractional part log A ' is called the mantissa. (2) Nowadays, (1) has been repurposed to mean that in floating-point representation, the part expressed as a decimal, for example, 2.99873 × 10 8 , is called the mantissa. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
(1) 正の数 A の常用対数は,一般に log A=n+ log A' と書ける。ここで n は整数, log A' は正の小数部分であって 0≦ log A'<1 。このときの整数部分 n を指標または標数,小数部分 log A' を仮数という。 (2) 現在では (1) を転用して,浮動小数点表現において,たとえば 2.99873× 108 という数の,小数で表わされた部分を,仮数と呼ぶ。
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