fplot giving a different graph than my graphing calculator

I am trying to graph a function in order to apply a Golden Section Search on it. However, fplot in matlab gives a completely different graph of the function than the same function graphed on my graphing calculator. The graph looks the exact same no matter what graphing tool I use (Desmos, Geogebra, etc), but in MatLab, it looks completely different. The function does not seem to be wrong since it calculates the right value for my input, so I am not sure what is wrong.

h=@(x)(12.6915*exp(0.5*x)-6.3).^2;
fplot(h)

I am pretty new to MatLab so I am not sure if I am plotting this right. I am just clueless as to why the graphs are so different.

Edit: When I plot the function on an iterval of [-2,-1], it looks the plots on the graphing calculators. Is there anyway to fix it so it plots like this without defining an interval?

Answer 1

[Voss]

You can specify an interval in fplot, like you said, or you can specify the x- and/or y-limits of the axes after the plot is made.

h=@(x)(12.6915*exp(0.5*x)-6.3).^2;
fplot(h);
xlim([-3 0]);
ylim([-1 3]);