Adding array to Chart only plots first value

Question

VB.net - How come only one point is plotted?

Dim ReceivedValue As String ="1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20"
Dim myArray = Array.ConvertAll(ReceivedValue.Split(","c), AddressOf Convert.ToDouble)
Chart1.Series(0).Points.Add(myArray)

PS. I got the plot array idea from here

A point is two values (X and Y). This is an array of single values (just X?). How do you want this graphed? Do you want them paired up? Do you have set value for X or Y? Do you want the X or Y value to be the index in the array? — Joel Coehoorn
– Joel Coehoorn, Commented Oct 31, 2018 at 19:31
Good question, the x doesn't matter at this point. It is reference waveform and no labels or numbers are even shown. — CircuitPro
– CircuitPro, Commented Nov 1, 2018 at 0:54

djv · Accepted Answer · 2018-11-01 14:40:24Z

2

I get the same results as you - one point on the chart. Upon inspecting the chart's Points object, it looks like this:

Showing an array with one X=0, and an array of all the Ys.

If you do it in a loop like this, it works

For Each point In myArray
    Chart1.Series(0).Points.Add(point)
Next

Now there is an actual series of points

I'm going to add what I think is more correct, because this results in actual x, y pairs with real x values (you can make them whatever you want)

For i = 0 To myArray.Count - 1
    Chart1.Series(0).Points.Add(New DataPoint(i, myArray(i)))
Next

edited Nov 1, 2018 at 14:40

answered Oct 31, 2018 at 19:11

djv

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3 Comments

CircuitPro Over a year ago

Ok thank you. That makes sense. I think that solution is the way to go. Thanks!

CircuitPro Over a year ago

So if I understand, all the Y values were plotting top of the same X position.

djv Over a year ago

Yes, even though when inspecting the Points object when added in a loop, all the Y values also have X = 0, the chart is able to chart it for some reason.

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