Interpolation and Intergration using Matlab

Hi,

I have been trying to use the Interpolation function in Matlab but not sure if what I am doing is correct.

I have gathered data from an experiment and wanted to get a smoother graph so that I can get an accurate output.

The data that I have is

Volts = 237;
Amps = [7:0.025:10.6];
time = [0:1:144];
yi = interp1(Amps,time,'spline');

figure(2)
plot(yi)

Power = Volts.*yi;

From the graph that Matlab output it I have time on the X axis and Current on the Y axis.

I then multiplied this by the voltage to give me the power corrosponding at the different point and now would like to know the total area under the curve.

I would like to know how to do this using a step type intergration at one second intervals.

Any help on the code would be appreciated.

Thanks Kayne

[kjetil87]

take a look a at

trapz(y)

[Jan]

Creating "smoother" graphs is not a scientifically correct method to show results of a measurement. Notice that a spline interpolation can increase the range of the values.

[kayne]

trapz(y) is the function that I needed, thanks for that