Using a list as a Y value in a python graph

[Afterdarkreader]

SO I have a function that returns a list and I want to use it as the Y value of a function. I'm currently getting an 'x and y must have the same first value' error. Anyone see the problem in my code?

def y(initialPop, popGrowth):
    y=initialPop
    yList = []
    x=0
    while x < 400:
        yList.append(y)
        y = initialPop * np.exp(popGrowth * (x/4)) - (newsDiscussion(1, 20, x, 0.0015, 0.003, 0.55)*y)-(Tax2(156, 160, x, 0.05775, 0.1155, 0.55)*y)-(Tax1(80, 84, x, 0.77, 0.154, 0.55)*y)-(runVeganuaryMain(x)*y)
        x = x + 1
    return yList[1:400]

x= np.linspace(0, 400, num=400000)
ax.set_title('cumulative decrease in consumption')
ax.set_xlabel('$Quarter$')
ax.set_ylabel('$Percent of the Population$')
ax.plot(x, y(initialPop, popGrowth), 'p-', lw=1, alpha=0.6, label='Major Graph')