MATLAB'使用图向量的错误必须具有相同的长度.' [英] MATLAB 'Error using plot Vectors must be the same length.'

问题描述

x = 0:1:5; % define x array 
y = exp(x)+x.^4+2*x.^2-x+3; % define y array
dx = diff(x); % 1 1 1 1 1 dx has one number less than x 
dy = diff(y); % -5 -1 -3 -4 -2
slope = dy./dx
z=exp(x)+4*x.^3 +4*x-1
plot(x,slope,'*',x,z)

使用绘图向量的错误必须具有相同的长度."

'Error using plot Vectors must be the same length.'

由于坚持了一段时间，我不确定该怎么办.香港专业教育学院看到相同的错误的其他响应，但无法理解代码.似乎是冒号:可能有帮助，但我不确定如何使用它.

Been stuck on this for a while, I am not sure what to do. ive seen the other responses to the same error but can not understand the code. It seems its the colon : that might help but i am not sure how to use it.

任何帮助将不胜感激！

Any help would be appreciated!

推荐答案

由于slope是根据两个连续值计算得出的，因此我建议您将连续点之间的平均值作为x-倾斜的轴值:

Since slope is computed from two consecutive values, I suggest you take the average betwen consecutive points as the x-axis values for ´slope`:

plot((x(1:end-1)+x(2:end))/2,slope, '*',x,z)

这篇关于MATLAB'使用图向量的错误必须具有相同的长度.'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！