How can I interpolate time?

14 次查看（过去 30 天）
Jaime De La Mota Sanchis
评论： Star Strider 2021-11-9
Hello everyone.
I have a vector with times called
tim1_1
, of size 51*1, I also have measurements called
lam1_1
made at those times.
tim1_1
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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采纳的回答

Star Strider
Star Strider 2021-11-8
Ran in:
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);
figure
plot(tim1_1, lam_1, '.b')
hold on
plot(tim1_2, lam_1_2, '.r')
hold off
grid
legend('Original','Interpolated', 'Location','best')
Experiment to get different results.
.

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