how can I convert an xy graph a waveform graph?

[julesjay]

hi!!

Everything is in the title!! I've made an XY graph and I would like to convert it into a waveform. To create this XY graph I give only the coordinates of each point.

Thanks

[becktho]

Hi

As far as I know this is not really possible with a built in function, you will have to do it yourself. In a XY-graph, XY-pairs are painted and connected. A waveform is defined by starttime, dt and the y-values. So if you want to make a waveform, you have to find a dt for the data in your xy-graph. This value will replace the x-value, as each y is at a defined x (yi = t0 + dt*i). In addition to that, you will have to set the y-values at the correct index, which obviously results in an array with zeros between the given values. To avoid this, you will have to interpolate the y-values between your given y-values.

Just an example:

xy-data (x/y): (0/2),(1/4),(1.5/3),(2.5/0)

This would result in the following waveform:

t0 = 0

dt = 0.5

y (before interpolation) 2,0,4,3,0,0,0

Interpolate the missing y values and you should get this waveform:

to = 0

dt = 0.5

y (after interpolation) 2,3,4,3,1.5,0

Hope this helps.

Thomas