Creating an XY graph from a while loop

[newbie 2]

Greetings,

I am having trouble bundling information from a while loop into a XY graph. I want to be able to vary the start time and end time of my graph, ultimately graphing amplitude vs time. Increments in 0.1 seconds.

Attached is a vi & Word document w/ a screen shot of my front and block diagram.

Thanks for your help.

I

[Gabi1]

check this if it help you getting started

[newbie 2]

Thank you, it works like a charm. Do you have any idea I how I could obtain the slope at two random points?

[newbie 2]

Thanks again,

I have a few questions. Would bundle have worked my requirements? All of the examples (with For Loops) showed bundle and nothing with the While Loop. I spend alot of time last night and this morning wrestling w/ trying to bundle.

Newbie 2

[Gabi1]

yes bundle would have worked for an xy graph:

you bundle the x array with the y array and send the cluster to the graph.

in this case the x array could have been for example the index of the loop.

there is no fundamental difference between a for loop or a while loop in this regard, and the shift register (keeps the data between iterations of the loop) works the same way.

[Gabi1]

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 Do you have any idea I how I could obtain the slope at two random points?

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Hum that is a little involved, as you have to define what are going to be your points.

the slope itsdelf very easy as soon as you have defined them: you can use directly the fit function in the mathematics panel, or calculate it yourself.

for picking up the points from the graph, there is no easy way that i know of, and this will require a small program of its own.

[Gabi1]

in this thread you will find very interresting examples set by Altenbach for moving points on a graph (example 1), and maybe connecting them to original data points (example 2) 

[newbie 2]

I am not sure how I would pick off the x-axis to give me the increments. Would I create a separate loop as you have shown? Also, any time I timed to specify a constant for the increment, the constant option wasn't available.

Thanks for your time and help.

[Gabi1]

look at this vi.

the x array is created out of the index.

[newbie 2]

Gabi1

Thank you again for your help! I've learn this morning from your help than I would typically learn in class for an evening.

Thank you