MATLAB爱好者论坛-LabFans.com - 【求助】新手關於 diff

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lythtang

2008-03-26 17:59

【求助】新手關於 diff

假設

syms x

y = sin(x);
Y=diff(y);

如何求 Y 的值當 x = pi/2 ?

fgabertb

2008-03-26 18:39

subs(Y,x,pi/2)

ans =

6.1232e-017

應該是0的不過浮點數誤差:redface:

所有时间均为北京时间。现在的时间是 12:20。