Why are tick marks only on one axis when I change the tick spacing?

I am making a plot in MATLAB, and I want to specify the spacing of tick marks and grid lines.

By default, I get something like this:

But I want both the x and y axes to have have lines with a spacing of 1. So I changed the code to this:

axis equal; 
xticks(1:1:5);
yticks(1:1:5);
grid on;

However, this causes the graph to look like this:

Notably, the horizontal grid lines and y-axis tick marks and labels are entirely gone. I have no clue why this would be. This seems like something that should be very straightforward, so not sure where the error could be coming in. Any help would be greatly appreciated. Thanks.

Answer 1

[Les Beckham]

Try

yticks(-4:0)

[Walter Roberson]

Right. The y range is negative, so specifying positive ticks makes all of the ticks be out of the plotting area.

[Axel Rimerman]

Welp, that was pretty straightforward. Not sure how I missed that, but thanks.

[Les Beckham]

You are quite welcome.