How to I generate continuous arrays from two arrays with different data points?

Question

Rowan Quintero 2023-8-2

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https://ww2.mathworks.cn/matlabcentral/answers/2003702-how-to-i-generate-continuous-arrays-from-two-arrays-with-different-data-points

评论： Rowan Quintero 2023-8-2

I would like to take two different array data sets:

e.g.

x1 = [ 1 5 8 20 ];

y1 = [10 12 15 20];

x1 = [2 6 8 19 21];

y1 = [1.5 5.3 16 22];

I would like to take these and turn the y values into continuous arrays along the same x array (say x = 0:1:22). That way I can find approximately what measurements of y1 and y2 are at for say x=2 and do things such as calculate the percent difference. Please let me know if this is not enough clarification.

Thank you!

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Answer 1

the cyclist 2023-8-2

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https://ww2.mathworks.cn/matlabcentral/answers/2003702-how-to-i-generate-continuous-arrays-from-two-arrays-with-different-data-points#answer_1282352

编辑：the cyclist 2023-8-2

在 MATLAB Online 中打开

Your question is not perfectly clear to me, but it sounds like you could use the interp1 function to interpolate each data set to a common set of x points.

x1 = [ 1 5 8 20 ];
y1 = [10 12 15 20];
x2 = [2 6 8 19 21];
y2 = [1.5 5.3 16 22 23]; % I changed this, because yours were not the same length
xq = 0:22;
y1q = interp1(x1,y1,xq)
y1q = 1×23
       NaN   10.0000   10.5000   11.0000   11.5000   12.0000   13.0000   14.0000   15.0000   15.4167   15.8333   16.2500   16.6667   17.0833   17.5000   17.9167   18.3333   18.7500   19.1667   19.5833   20.0000       NaN       NaN
y2q = interp1(x2,y2,xq)
y2q = 1×23
       NaN       NaN    1.5000    2.4500    3.4000    4.3500    5.3000   10.6500   16.0000   16.5455   17.0909   17.6364   18.1818   18.7273   19.2727   19.8182   20.3636   20.9091   21.4545   22.0000   22.5000   23.0000       NaN