Data arithmatic addition with single precision

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GAGARIN BISWAL
GAGARIN BISWAL 2019-9-27
编辑： James Tursa 2019-9-27
Hello
I am adding 21 elements of an array by two different methods. The two methods should show same value. But while printing the results the are different. Please suggest.
clc
clear all
close all
x=rand(1,100)*10^16;
x = single(x)
method1 = sum(x(1:21))+x(22)-x(1);
method2 = sum(x(2:22));
sprintf('%f',method1)
sprintf('%f',method2)
Regards,
Gagarin

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回答（1 个）

James Tursa
James Tursa 2019-9-27
编辑：James Tursa 2019-9-27
Floating point operations will often yield slightly different results if you change the order of operations. This is to be expected.
https://www.mathworks.com/matlabcentral/answers/57444-faq-why-is-0-3-0-2-0-1-not-equal-to-zero

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