input matlab.mp
prologues:=0;
beginfig(1)
draw begingrf(5in,4in);
rdata("sample_data",1);
rdata("sample_data",2);
rdata("sample_data",3);
rdata("sample_data",4);
mtplot("0 2 cr linewidth 2  td"); 
mtplot("0 3 cb linewidth 1  solid "); 
mtplot("0 1 cg linewidth 4 pdot "); 

ylabel("blahblah");
xlabel("data from an arbitrary sample\_data");
finishgrf; 
legend(3,3,"$\alpha \geq \beta$ \bf BoldFace\it italic","ABCDEXYZZZZ","blahblah");
legend(3,1,"\bf you can have multiple legends ! \tt :)","ABCDEXYZZZZ","blahblah");
endfig;

end