CGAffineTransformInvert: singular matrix

[schooltech]

hi,
error repeatedly with a LineChartView:
[Unknown process name] CGAffineTransformInvert: singular matrix.

and my code is as below:
`struct ZLineChartView: UIViewRepresentable {

var title: String
var dataPoints: [String]
var values: [Double]
var drawValueLabel: Bool

func makeUIView(context: Context) -> LineChartView {
    
    let chartView = LineChartView()
    chartView.noDataText = "no data"

    chartView.chartDescription?.enabled = false
   
    chartView.legend.yOffset = 0
    chartView.autoScaleMinMaxEnabled = false
    
    chartView.xAxis.drawLabelsEnabled = true
    chartView.xAxis.enabled = true
    //lineChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values: dataPoints)
    chartView.xAxis.granularity = 1.0
    chartView.xAxis.labelPosition = .bottom
    chartView.xAxis.drawGridLinesEnabled = true
    chartView.xAxis.labelTextColor = UIColor(named: "checkAxisColor")!
    
    chartView.leftAxis.labelTextColor = UIColor(named: "checkAxisColor")!
    
    chartView.legend.textColor = UIColor(named: "checkAxisColor")!
    
    chartView.rightAxis.drawAxisLineEnabled = false
    chartView.rightAxis.enabled = false
    
    chartView.scaleXEnabled = false
    chartView.scaleYEnabled = false
    
    chartView.animate(xAxisDuration: 1)
    
    return chartView
}

func updateUIView(_ uiView: LineChartView, context: Context) {
    
    var dataEntries: [ChartDataEntry] = []
    
    for i in 0..<dataPoints.count {
        let dataEntry = ChartDataEntry(x: Double(i), y: values[i])
        dataEntries.append(dataEntry)
    }
    
    let lineChartDataSet = LineChartDataSet(entries: dataEntries, label: self.title)

    lineChartDataSet.fillColor = UIColor(named: "chartBar")!
    lineChartDataSet.lineWidth = 1
    lineChartDataSet.drawValuesEnabled = self.drawValueLabel
    
    lineChartDataSet.drawCirclesEnabled = false
    lineChartDataSet.circleHoleColor = UIColor(named: "chartBar")
    lineChartDataSet.drawCircleHoleEnabled = false
    
    lineChartDataSet.colors = [UIColor(named: "chartBar")!]
    
    let lineChartData = LineChartData(dataSet: lineChartDataSet)
    
    uiView.data = lineChartData
    
}

}`

[liuxuan30]

well.. need log rather than code sample. For such issues, it's usually the data casues the matrix invalid. So you probably want to check your data entry first

[ccworld1000]

This problem should be opened. I also have this problem. The original problem of illegal data also has the problem of singular matrix

[ccworld1000]

I made a demo to demonstrate the existence of this problem
https://github.com/ccworld1000/CCSingularMatrixProblem.git

[theedov]

getting the same errors when my dataset is empty.

[xsleonard]

This occurs if there are 2 or more data entries and all entries have the same y value