plt.show 和 plt.savefig 给出不同的结果

Question

This is my code, and i get different result from plt.savefig and plt.show

I have trid to use the bbox_inches='tight', but that makes the picture size become not exactly 700*400.

x=np.linspace(1*13,20*13,20)
ys=[[9.429781134779862, 5.29464711177, 3.607607723166614, 2.899937651340496, 2.191804841696895, 1.9843671555485882, 1.7248100121771586, 1.3670895074513212, 1.3698780260605596, 1.2462146230823874, 1.1289892836337199, 1.032841253332204, 0.9543441746831577, 0.7484693801176594, 0.8376893177858197, 0.7849478402160176, 0.7434280956345902, 0.7000987139186625, 0.665212069607791, 0.6300403225806451], [126.98106331402796, 53.50512044002611, 30.074826167504753, 24.227858160427186, 16.471886607532593, 14.13705307473836, 11.449887848348526, 8.72965989245059, 8.840716805318575, 7.263008047412916, 6.293385023002322, 5.634501177610746, 4.6241919224615495, 3.9431399223201433, 3.937845053672828, 3.578854694920532, 3.3610282057487026, 2.947140095251568, 2.629807287721956, 2.5260498894853174]]
plt.figure(figsize=(7,4))
plt.plot(x, ys[0], marker='o',markersize=10,  label='original method')
plt.plot(x, ys[1], marker='s',markersize=10,   label='our method')

plt.xlabel('Number of trajectories(×1000)',fontsize=20)
plt.ylabel("QPS",fontsize=20)  
plt.yscale('log')
plt.xticks(fontsize=15)
plt.yticks(fontsize=15)
plt.legend(fontsize=20)
plt.savefig("../res/dense.png",dpi=plt.gcf().dpi)
plt.show()

This is the two pictures I got from savefig() and show()

Answer 1

You can use:

plt.show() before

plt.savefig("../res/dense.png",dpi=plt.gcf().dpi)

It's just a matter of convention. When we call plt.savefig the reference of all the variable point till plt.savefig after that any statement it corresponds to new plot.

You can accept the answer. If it helps.