MATLAB: How to draw horizontal X(0,0) single grid line

graphMATLAB

Just wondering, I need to show the central X(0,0) line visible (and not other grids) in my plot where there have positive and negative values with Y axis? I tried this to draw the line,
line([0 84436], [0 0]);
But, it comes in the legend lists (which obviously should not be) and it does not give black or grid colour.
Any suggestion is much appreciating.

Best Answer

This will draw a reference line, with a slope and intercept of 0.
refline(0,0)
However, I do see that it does show up if I use legend, with no arguments. So this shows the refline in the legend:
plot(randn(1,10),randn(1,10),'o')
refline(0,0)
legend
Instead, I can call legend with my own descriptions. So if there are 3 curves, just call legend with 3 names.
plot(randn(10,3),randn(10,3),'o')
refline(0,0)
n = 3;
legtit = cell(1,n);
for i = 1:n
  legtit{i} = ['Data ',num2str(i)];
end
legend(legtit(:))
As you can see, no refline in the legend.
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