作业帮matlab求导数好像每次都不行,每次都说代码不完整或错误>> a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).|Error:Expression or statement is
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![matlab求导数好像每次都不行,每次都说代码不完整或错误>> a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).|Error:Expression or statement is](/uploads/image/z/2476829-29-9.jpg?t=matlab%E6%B1%82%E5%AF%BC%E6%95%B0%E5%A5%BD%E5%83%8F%E6%AF%8F%E6%AC%A1%E9%83%BD%E4%B8%8D%E8%A1%8C%2C%E6%AF%8F%E6%AC%A1%E9%83%BD%E8%AF%B4%E4%BB%A3%E7%A0%81%E4%B8%8D%E5%AE%8C%E6%95%B4%E6%88%96%E9%94%99%E8%AF%AF%3E%3E+a%3Ddiff%28%5Bsqrt%28x%5E2-+2%2Ax%2B5%29%2Ccos%28x%5E2%29%2B2%2Acos%282%2Ax%29%2C4%5E%28sin%28x%29%29%2Clog%28log%28x%29%29%5D%29.a%3Ddiff%28%5Bsqrt%28x%5E2-+2%2Ax%2B5%29%2Ccos%28x%5E2%29%2B2%2Acos%282%2Ax%29%2C4%5E%28sin%28x%29%29%2Clog%28log%28x%29%29%5D%29.%7CError%3AExpression+or+statement+is)
matlab求导数好像每次都不行,每次都说代码不完整或错误>> a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).|Error:Expression or statement is
matlab求导数好像每次都不行,每次都说代码不完整或错误
>> a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).
a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).
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Error:Expression or statement is incomplete or incorrect.这就是我的代码,哪里错了啊?
matlab求导数好像每次都不行,每次都说代码不完整或错误>> a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))]).|Error:Expression or statement is
这个问题简单,要先定义x为符号变量就可以了
代码
syms x;
a=diff([sqrt(x^2- 2*x+5),cos(x^2)+2*cos(2*x),4^(sin(x)),log(log(x))])
结果
a =
[ 1/2/(x^2-2*x+5)^(1/2)*(2*x-2), -2*sin(x^2)*x-4*sin(2*x), 4^sin(x)*cos(x)*log(4), 1/x/log(x)]