Divide y values of two graph?

Question

Muhammad Rizki Nasution 2018-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/406540-divide-y-values-of-two-graph

评论： Alireza Qaderi 2021-2-3

i want to divide y values of the orange line by the blue line with the same x value, but x values have different point so they have different matrix size, i'm a noob, could you help me?

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Ankita Bansal 2018-6-20

Your question is a bit unclear. Can you give more information?

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Answer 1

Sayyed Ahmad 2018-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/406540-divide-y-values-of-two-graph#answer_325451

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what about htis?

x=1:20;
x2=1:5:20;
y1=x.^2;
y2=x2.^3-x2.^2+0.5*x2;
plot(x,y1,'b-',x2,y2,'g.-')
y3=interp1(x2,y2,x);
hold on;
plot(x,y1,'b-',x,y3,'r*')

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Muhammad Rizki Nasution 2018-6-20

thanks, it works

Alireza Qaderi 2021-2-3

Great

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Answer 2

Steven Yeh 2018-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/406540-divide-y-values-of-two-graph#answer_325455

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You could create a new time series, and use linear interpolation to find corresponding values.

For example:

ax = linspace(0, 10, 20);
ay = ax;
bx = linspace(0, 10, 30);
by = bx/2;
timeSeriesWanted = linspace(0, 10, 1000);
ay_interpolated = interp1(ax, ay, timeSeriesWanted);
by_interpolated = interp1(bx, by, timeSeriesWanted);
ay_dividedBy_by = ay_interpolated ./ by_interpolated;
plot(ax, ay,'*-')
hold on
plot(bx, by,'*-')
plot(timeSeriesWanted, ay_dividedBy_by, '-');
legend('a', 'b', 'a/b with interpolation')