/usr/share/doc/asymptote-doc/src/exp.asy is in asymptote-doc 2.37-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 | import graph;
size(150,0);
real f(real x) {return exp(x);}
pair F(real x) {return (x,f(x));}
xaxis("$x$");
yaxis("$y$",0);
draw(graph(f,-4,2,operator ..),red);
labely(1,E);
label("$e^x$",F(1),SE);
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