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zhouweixia铁杆木虫 (正式写手)
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[求助]
求助键长进位的问题
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| 在生成的cif文件中,键长的不确定标准偏差大于十时,如何通过进位,使得其小于十,进位规则是什么。比如,Cu-Cu键长为2.5927(14),那么要使得括号内的值小于十,咋么进位?希望各位高手给我支支招,谢谢! |
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wormma
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【答案】应助回帖
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帝夫(金币+2, CMEI+1): 很好!授予CMEI一枚,欢迎继续关注晶体版! 2011-12-16 14:57:32
帝夫(金币+2, CMEI+1): 很好!授予CMEI一枚,欢迎继续关注晶体版! 2011-12-16 14:57:32
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找到了“晶体学会的规定”。按作者自己的说法,只是‘recommadation'.如果想在误差中保留1位有效数字,仍然是符合规定的,只是舍入误差稍大。下面是原文,供查阅。 12. The numerical value of an estimate y and its standard uncertainty u(y) should not be reported with an excessive number of digits. However, y should be quoted with sufficient accuracy to minimize the effect of roundoff error* in subsequent calculations. In order to limit the round-off error of y (denoted by e) to 25% of u(y), u(y) should be quoted to two significant digits in the range 10 to 19, implying that corresponding digits also be quoted for y, and to one significant digit in the range 2 to 9. In general, uncertainties should be rounded up rather than to the nearest digit. For example, a bond distance of 1.542 49/~ with a s.u. of 0.015 32/~ should be reported as 1.542 (16)/~ (e = 3%), and one of 2.163 52A with a s.u. of 0.004 81/~ should be reported as 2.164 (5)/~ (e = 10%). Correlation coefficients should normally be quoted with two significant figures unless their absolute value is close to the value of 1.0, in which case three significant figures should be used. |

15楼2011-12-16 12:53:02
wormma
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2楼2011-12-14 09:46:53
zhouweixia
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3楼2011-12-14 10:22:05
wormma
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4楼2011-12-14 11:37:53







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