绘图时内部矩阵尺寸误差必须一致 [英] Inner matrix dimensions error must agree error when plotting

问题描述

我正在尝试绘制函数:f(x)= x * e ^(x)* cos(x)从0到2 * pi.我试过跑步:

I'm attempting to plot the function: f(x) = x * e^(x) * cos(x) from 0 to 2*pi. I've tried running:

x = 0:pi/100:2*pi;
y = x*exp(x)*cos(x)

但是，每次我尝试设置y时. Matlab向我抛出使用*出错"，并说内部矩阵尺寸必须一致.为什么会发生这种情况的任何见解?

However, every time I attempt to set y. Matlab throws me a 'Error using *' and says Inner matrix dimensions must agree. Any insight into why this happens?

推荐答案

您必须使用.*(逐元素乘法)，而不是*(矩阵乘法)

You have to use .* (element-wise multiplication), not * (matrix multiplication)

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