Question

how can i solve the problem of these two images automatically (with a code adaptable to different data) without having to fix the axes range for each plot (i have millions of these plots)?

problem: axis range should be smaller

problem: axis range should be bigger

also, i need axis to be correctly labeled from the first value to last (see example in comment please)

any help is highly appreciated. thank you so so much.

Answer 1

In order to have a complete bounding box use box on.

In order to avoid large empty space around a plot (or no space at all) use xlim and ylim. Try the following:

figure
plot(x,y)
box on

x1 = min(x);
x2 = max(x);
dx = x2-x1;
y1 = min(y);
y2 = max(y);
dy = y2-y1;

fc = 10/100  % this is a factor of 10% of empty space around plot


xlim([x1-dx*fc x2+dx*fc])
ylim([y1-dy*fc y2+dy*fc])

If you want to have a tick value appear at the start and the end of the axis, you could either force it by set(gca,'Xtick',[values]), where values are those ticks you want to show; or by floor and ceil of the xlim and ylim min and max limits above.

Hope this is what you need