Why my XY chart does not work?

[jwscs]

"I have searched the examples but none of them use XY graph. Is it even possible to chart in real time using this XY graph? "

1) then you should try again (e.g. "XY Graph Data Types.vi")

2) note that there is a difference between charts and graphs, the first keeps an internal buffer/history, and new values are appended, second displays only what is input to them  (and to answer your question YES)

[cookie_monster9]

Here is an idea, based on something I saw here. I can take the values from the Sine functions, build them into array and use a shift register to add points at each iteration. I can send each vector to an axis on the XY graph and it will plot all the available points.

[jwscs]

yup, so far everyone (including me in my answer before switched X and Y)

try this:

[cbutcher]

Copying from detailed help, available when using the Context Help (Ctrl-H) and hovering over an XY Graph terminal.

Displaying a Single Plot on XY Graphs
The XY graph accepts three data types for single-plot XY graphs. The XY graph accepts a cluster that contains an x array and a y array.

The XY graph also accepts an array of points, where a point is a cluster that contains an x value and a y value. The XY graph also accepts an array of complex data, in which the real part is plotted on the x-axis and the imaginary part is plotted on the y-axis.

Displaying Multiple Plots on XY Graphs
The XY graph accepts three data types for displaying multiple plots. The XY graph accepts an array of plots, where a plot is a cluster that contains an x array and a y array.

The XY graph also accepts an array of clusters of plots, where a plot is an array of points. A point is a cluster that contains an x value and a y value. The XY graph also accepts an array of clusters of plots, where a plot is an array of complex data, in which the real part is plotted on the x-axis and the imaginary part is plotted on the y-axis.

This section of the help is very useful, but I have to re-read it almost every time I want multiple plots. In your case, you currently only want a single plot, so that's a little simpler. In my snippet, I showed the use of the second option: "an array of points, where a point is a cluster that contains an x value and a y value".

[jwscs]

ps: the color (and thus type) of the xy-graph on the block diagram changes depending what you wired into it

(in this thread we have brown and pink/red so far)

have a look at the labview examples again, especially the "XY Graph Data Types.vi"

[Wentao_Ji]

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@jwscs wrote:

@Wentao_Ji ... plz check your vi, it doesnt work! you made the same error as OP

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I thought the OP wanted something like a Lissajous curve.

[jwscs]

i don't know what that is, but if its a thing .. that might be my fault then :cheers:

TIL https://en.wikipedia.org/wiki/Lissajous_curve

[Wentao_Ji]

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@cookie_monster9 wrote:

Here is an idea, based on something I saw here. I can take the values from the Sine functions, build them into array and use a shift register to add points at each iteration. I can send each vector to an axis on the XY graph and it will plot all the available points.

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You are right here.

I thought your question was about differentiating a graph from a chart. Basically, what you want is to make a graph to behave like a chart, I guess that's what you mean by "in real time". That is going to require your extra code to maintain a history for the graph, as the chart will do automatically, and that's what everyone was talking about.

As @cbutcher and @jwscs have also mentioned, it is also possible to display multiple plots on one XY Graph, if that was your intention.

[Wentao_Ji]

Yes, that's what I was thinking. The image on the Wikipedia page just reminds me of the first time of playing around with oscilloscopes and waveform generators.

[cbutcher]

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Wentao_Ji wrote:

As @cbutcher and @jwscs have also mentioned, it is also possible to display multiple plots on one XY Graph, if that was your intention.

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To be clear, my snippet only plotted one curve, of the lissajous curve type.

Edit: I failed to read clearly enough. Sorry! Sadly I can't delete my post, so an apologetic edit is the best I can manage.