Getting Discrete Data from an x-y Plot

2011 12 19
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Hi,
I have data from an experiment and I can plot the Temperature Vs Time for a thermocouple (where the data is recorded every 22secs approx. for about 3000secs)
However, I want to look up the value of the Temperature at discrete times from 0-3000secs in steps of 0.5 secs, and generate and array from this.
I have looked at the c2d function in Matlab but maybe there is a more straight forward way?
Can anyone help?
Many Thanks,
Robin

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Wayne King
Wayne King 2011-12-19

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Hi Robin, you can interpolate to a finer grid.
X = 0:10; V = sin(X);
stem(X,V);
Xq = 0:.25:10;
Vq = interp1(X,V,Xq);
figure;
plot(X,V,'o',Xq,Vq)
Although, you're considering a particularly large refinement here from 22 seconds down to 0.5 seconds, so depending on how fast the temperature data is varying, the interpolation might be that good.

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