gistfile1.txt

 A = [ ...
   100^2  100*3.19766998291015625E-002/4.96048927307128906E-002
   200^2	100*0.33522772789001465/0.49293804168701172
   300^2	100*1.1971025466918945/1.7717289924621582
   400^2	100*2.9364573955535889/4.4804339408874512
   500^2	100*5.6204292774200439/8.7561042308807373
   600^2	100*10.630518913269043/16.120862007141113
   700^2	100*19.235197305679321/28.742238998413086
   800^2	100*32.594357967376709/50.967889070510864
   900^2	100*39.031611204147339/61.279205322265625
   1000^2 100*49.198805809020996/76.746974229812622
   1100^2 100*68.415740013122559/106.69846105575562
   1200^2 100*77.390275716781616/122.03094696998596
 ];
 figure; 
 plot(A(:,1),A(:,2))
 title('Percentage of Matrix-Vector product time')
 xlabel('N^2')
 ylabel('Percentage')
 grid on; grid minor