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how to estimate 1-a/b with (a close to b) correct

how to estimate 1-a/b with (a close to b) correct# Computation - 科学计算

s*i2005-06-06 07:06

1 楼

Hi,
it is well known that we should try to avoid the subtration of two nearly equal
numbers due to the cancellation error.
Is there any smart way to rewrite 1-a/b when a and b are close?
Thanks.

r*y2005-06-06 07:06

2 楼

double precision a, b
double precision c
c = 1.0d0/b
1.0d0 - a * c

equal

【在 s**i 的大作中提到】

: Hi,
: it is well known that we should try to avoid the subtration of two nearly equal
: numbers due to the cancellation error.
: Is there any smart way to rewrite 1-a/b when a and b are close?
: Thanks.