How can I interpolate time?

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Jaime De La Mota Sanchis
Jaime De La Mota Sanchis 2021년 11월 8일
댓글: Star Strider 2021년 11월 9일
Hello everyone.
I have a vector with times called
, of size 51*1, I also have measurements called
made at those times.
goes between 0 and 1.737857815507103e+03. Instead of 51 measurements I want to have an arbitrary number, let's say 200. I have tried to write
interpLam1_1R = interp1(tim1_1,lam1_1,1:tim1_1(end)/200:tim1_1(end),'spline');
Unfortunately, if I plot the obtained results, they don't look like the original ones at all. As can be seen in the attached figure, the original data (in blue) looks almost sinusoidal,meanwhile, the interpolated data looks almost as a straight line.
Can someone please help me with this problem?

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Star Strider
Star Strider 2021년 11월 8일
Apparently ‘tim1_1’ is not a datetime array.
tim1_1 = linspace(0, 1.737857815507103e+03, 51);
lam_1 = sin(2*pi*1E-3*tim1_1);
tim1_2 = linspace(min(tim1_1), max(tim1_1), 200);
lam_1_2 = interp1(tim1_1, lam_1, tim1_2);
plot(tim1_1, lam_1, '.b')
hold on
plot(tim1_2, lam_1_2, '.r')
hold off
legend('Original','Interpolated', 'Location','best')
Experiment to get different results.
  댓글 수: 2
Star Strider
Star Strider 2021년 11월 9일
As always, my pleasure!

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