plot - 'x' and 'y' lengths differ in R -

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i trying plot horizontal line in r, giving me error.

code:

w <- seq(1, 99, by=1) alpha <- 0.1 beta <- 0.001  u <- alpha*w -(beta/2)*w*w uprime <- alpha -(beta)*w udprime <- -beta utprime <- 0  plot(w,udprime,type = "l",main = "graph of u(w) versus wealth",xlab = "wealth",ylab = "utility function")

when plot function out, error:

error in xy.coords(x, y, xlabel, ylabel, log) :    'x' , 'y' lengths differ

why so? need guidance.

to plot horizontal line second derivative of wealth utility function, you'll need make sure udprime has point every point w. there's 2 ways this:

shortcut:

plot(cbind(w, udprime))

more "true math":

udprime = -beta * w^0

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