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

Question

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 =         


        

Answer 1

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)