Creating a legend in R with matching color and line shape

Question

How can I create a proper legend with the corresponding line type and color? Also, how can I create a Title for this graph?

In my legend, R corresponds to the solid black line, L is the dashed red line, and G is the green dotted line

Here is the code on how I created my graph and my legend:

matplot(x_values, cbind(r_y_values, l_y_values, g_y_values), type = 'l', xlab='N', ylab='Time(ms)')
legend("topleft", legend=c("R", "L", "G"), col=c(1:3), inset=0.01)

Answer 1

Just specify an lty value.

legend("topleft", legend=c("R", "L", "G"), col=c(1:3), lty=1:3, inset=0.01)