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Xizeng Feng


Last seen: 2 years 前 |  自 2021 起处于活动状态

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提问


what is wrong with my calculation?
It hints the expresion was wrong when I solve the equations as follow: >>syms rs xs rp xp >> [xs,xp]=solve(rs*rp^2/(rs^2+(xs+x...

2 years 前 | 1 个回答 | 0

1

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提问


Why the results are different when use different letters?
I solve same equations in different ketters and got fifferent results as follow: But rs=a, xs=b, rp=c and xp=d. the equations...

2 years 前 | 3 个回答 | 0

3

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提问


How to draw a ball by plot3?
I am learning the MATLAB,

2 years 前 | 3 个回答 | 0

3

个回答

提问


How to vectorize the function?
I run the following codes and had the result of fplot. But comes also some warning as in the bottom, Can anyone tell me how to...

2 years 前 | 2 个回答 | 0

2

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提问


In the Symbolic toolbox,how to get the results like in the old version
In the symbolic toolbox, the results in newer version are different from the old version. For example: >> syms x >> int(1/(x-...

2 years 前 | 2 个回答 | 0

2

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提问


如何处理符号运算在不同版本的差别
同样的符号运算，在MATLAB的新旧版本里得到的结果是不一样的，比如 >> syms x >> int(1/(x-x^2)) 在新版本里： ans = 2*atanh(2*x - 1) 在旧版本里： ans= log(x)-log(x-1)...

2 years 前 | 0 个回答 | 0

0

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提问


How to multiply 2 arrays by elements
I have 2 arrays of complex numbers and want to get the result of multiply element by element. What can I do? thanks a lot!

2 years 前 | 1 个回答 | 0

1

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提问


how to vectorize a function?
I ran the following and got some reply: >> y=@(x)x^2; >> fplot(y) 警告: 函数处理数组输入时行为异常。要改善性能，请将您的函数正确向量化，以返回大小和形状与输入参数相同的输出。 >...

3 years 前 | 0 个回答 | 0

0

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提问


What is the prblem?
I run the following sentens and got the warnings, someone can explain them? >> y=@(x)x^2; >> fplot(y) 警告: 函数处理数组输入时行为异常。要改善性能...

3 years 前 | 0 个回答 | 0

0

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