MATLAB: How to set y-axes intercept

axes intercept

How do you make the y-axis cross the x-axsis at observation 1 and not 0? Sometimes it happends automatically, sometimes not. Try the code below. The two figures has different axes intercept.
A = rand(15,1);
plot(p1990K1BPreg(1:10, 1))
plot(p1990K1BPreg(1:15, 1))
How do you make the y-axex always intercepting at x=1, as in figure 1 above?

Best Answer

You can set the limits of the x-axis directly using the xlim function. If you're plotting (x,y) data, you can easily just set the lower x-limit equivalent to your first data point. Here is a little example to help get you started:
% Generate arbitrary data and plot
numPoints = 15;
x = 1:numPoints;
A = rand(numPoints,1);
plot(x,A)
% Get current x-limits
currentLimits = xlim;
% Set x-limits to ensure graph starts at first data point
xlim([x(1) currentLimits(2)]);
As you can see, the xlim function can be used to both get information on the current axes and to set limits. Hope this helps!
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