为什么看起来有效的语句在 MATLAB 中会出错？
这是来自这个 问题。
为什么这两个解决方案不起作用，尽管它对我来说看起来非常有效：
>> t = -pi:0.1:pi;
>> r = ((sin(t)*sqrt(cos(t)))*(sin(t) + (7/5))^(-1)) - 2*sin(t) + 2 ;
??? Error using ==> mtimes
Inner matrix dimensions must agree.
>> t = -pi:0.1:pi;
>> r = ((sin(t).*sqrt(cos(t))).*(sin(t) + (7/5)).^(-1)) - 2*sin(t) + 2 ;
>> plot(r,t)
??? Error using ==> plot
Vectors must be the same lengths.
以上有什么问题吗？
It's from this question。
Why the two solutions doesn't work, though it looks very valid for me:
>> t = -pi:0.1:pi;
>> r = ((sin(t)*sqrt(cos(t)))*(sin(t) + (7/5))^(-1)) - 2*sin(t) + 2 ;
??? Error using ==> mtimes
Inner matrix dimensions must agree.
>> t = -pi:0.1:pi;
>> r = ((sin(t).*sqrt(cos(t))).*(sin(t) + (7/5)).^(-1)) - 2*sin(t) + 2 ;
>> plot(r,t)
??? Error using ==> plot
Vectors must be the same lengths.
What's wrong with the above?
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*运算符是矩阵乘法运算符，要求其操作数具有匹配的内部矩阵维度。.*运算符是逐元素乘法运算符，它要求其操作数具有相同的大小（或者其中一个是标量），以便它可以对每个匹配的元素对执行乘法。有关更多详细信息，请参阅此链接。另外，当我运行第二个解决方案时，我没有收到您所出现的绘图错误。我刚刚收到这个警告：
The
*operator is the matrix multiplication operator, which requires its operands to have matching inner matrix dimensions. The.*operator is the element-wise multiplication operator, which requires its operands to have the same size (or for one to be a scalar) so it can perform multiplication on each matching pair of elements. See this link for more detail.Also, I don't get the plotting error you do when I run the second solution. I just get this warning: