Getting Discrete Data from an x-y Plot

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

Answer 1

[Wayne King]

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.

[robin mooney]

That worked just great Thanks Wayne!