Program that will draw a(t) knowing x(t) in SHM

[silt]

A few days ago I carried out an experiment about Simple harmonic motion. In the attachment I added the scheme of the laboratory.

I have collected the following data : time(s), displacement(m), velocity(ms-1)

I can obviously plot the graph of x(t). However, the next task is to draw a graph of a(t).
As far as I know, I can calculate the acceleration by using first derivative of velocity. Since I have about 300results I am definitely not going to do it manually :D

Is there any program that I can use to automatically plot the acceleration vs time graph ?
In class we used 'coachlab II', but that little sucker deleted all the graphs when the device was disconnected and right now I have no access to that software.

Cheers

 

[akinokoe]

You can try Labview, Matlab, Origin, or even Excel. Since you already have the data the work is easy.

 

[silt]

T=0,67s
initial displacement = 0,299m

a=-\omega²*x

\omega=\frac{2\pi}{T}=\frac{2\pi}{0,67}

Since initial displacement is not equal 0, would it be a good idea to calculate it from forumla (initial displacement - displ. at the moment) ?

Are these correct calculations of acceleration ?