semilogy([​34,34],[0,​22222]) does not show vertical line

I need to plot a vertical line in a figure with log y-axis:

semilogy([34,34],[0,22222]);

But the figure does not show the vertical line.

For horizontal line,

semilogy([34,66],[22222,22222]);

This command works and shows an horizontal line.

Can anyone help me, thanks in advance.

[raym]

For the non-log plot, I can plot the vertical line using "plot" or "line" command, but if I hold on and make y-axis in log, then these vertical line disappeared.

Answer 1

[raym]

I got it. I cannot use zero in log plot, use 0.00000001 or so instead.