Vertical line to the plot when ylimit is manually set to [0 inf]?

I want to add a vertical line in my plot. It adds succesfully when I do not use 'ylim'. However it doesnot when ylim[0 inf]. How do I add a v-line when ylimits have been changed manually?

[KSSV]

YOu can limit to inf....take some very big number and give that value instead of inf.

[Raju]

Thanks. It worked.

Answer 1

[madhan ravi]

ylim([0 inf])
  % ^-—-—-—-^-—-— missed it