Look at this
t=0:0.001:10;
y=12.5*sin(t)
plot(t,y)
yt=get(gca,'ylim')
nyt=yt(1):2:yt(2)
ytl=cellfun(@(x) sprintf('%.2f',x),num2cell(nyt),'un',0)
set(gca,'ytick',nyt,'yticklabel',ytl)
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