I have two lines as follows:
line1 = [381156070.426869 18991280402.5489 37851706111.2345 56587010947.1738 75196128662.4516 93674380500.2200 112020661854.784 130232977843.840 148303323664.688 166236447369.432 184023492340.442 201671255959.833 219177990730.184]
line2 = [381152328.260590 18991096195.2797 37851417428.7922 56586627760.8760 75195661261.4112 93673851555.4860 112020130905.813 130232444040.681 148302785591.610 166235904318.277 184022946251.285 201670702121.807 219177431057.645]
If I just use plot function in mathlab, the figure is thisI need to plot the two line in one figure which could see they are different, i.e. one is above another. But the diff value of the two lines is very less than the highest value minus the lowest value, such as line1[1] << line1[12] - line1[1], so when I plot the two lines ,they are overlap each other.
How could I plot these two lines in the same figure but able to see their difference?
Or is it OK to plot the diff values of the two lines(result in one line) in a paper?
Just plotting the common line emphasizes that the difference is quite small. That may be the message you want to present. Otherwise, I would plot a chart with two $y$ axes, one for the average value of the two lines and one for the difference between them and one line for each. It will take some thought to understand, but will get the point across.