B4J Question Use of a list in scatter chart of library jChat

Cal4th · Jan 2, 2018

I am trying to csv files to plot a series in a scatter chart but it is not letting me, could someone help me solve the problem

Iam using the below for loop for it:

B4X:

  Xc = File.ReadList(File.DirApp, "naca0015x.csv")
  Yc = File.ReadList(File.DirApp, "naca0015y.csv")
 Dim Series1 As XYSeries
    Series1.Initialize("Original Profile")
    For i = 0 To Xc.Size - 1 'Xc adn Yc are the same size
        Series1.Add(Xc.Get(i),Yc.Get(i))
    Next
    ScatterChart.AddSeries(Series1)

the error that appears in the log file is "java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number"

Erel · Jan 2, 2018

Change your code to:

B4X:

Dim x As Double = Xc.Get(i)
Dim y As Double = Yc.Get(i)
Series.Add(x, y)

Cal4th · Jan 3, 2018

Thank you Erel, i tried it but know another error appears,and i dont understand what it means.
if you can help me i will appreciate it double.

Error:
java.lang.NumberFormatException: For input string: "ï»¿1"

Code changed:

B4X:

    Dim Series As XYSeries
    Series.Initialize("Original Profile")
    For i = 0 To Xc.Size - 1
        Dim x As Double = Xc.Get(i)
        Dim y As Double = Yc.Get(i)
        Series.Add(x, y)
    Next

Erel · Jan 3, 2018

Please start a new thread for a new question and make sure to post the full error message from the logs and the line that raised the error.

B4J Question Use of a list in scatter chart of library jChat

Cal4th

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Erel

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Cal4th

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Erel

B4X founder

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B4J Question Use of a list in scatter chart of library jChat

Cal4th

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Erel

B4X founder

Cal4th

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Erel

B4X founder

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