matlab如何控制数值精度

Demyar

matlab如何控制数值精度

8 L! t5 O. k1 c& l9 U

% vpa函数，控制数值精度，a=3.14159......，取vpa(a,5)后，输出为3.1416

a=pi;

' X+ {6 h  }& W2 l8 H

vpa(a,5);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% round函数，将数据进行四舍五入

round(pi)    %输出为3

round(-1.9) %输出为-2

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

yxlk

不错