I'm importing a csv file of 299 rows and creating a subset by filtering on one column value (24 rows). I want to Chart just the filtered values. However, when I print one column I get values from the original dataFrame. Any suggestions? Thanks, David
The code:
import SwiftUI
import Charts
import TabularData
struct DataPoint: Identifiable {
var id = UUID() // This makes it conform to Identifiable
var date: Date
var value: Double
}
struct ContentView: View {
@State private var dataPoints: [DataPoint] = []
var body: some View {
Text("Hello")
Chart {
ForEach(dataPoints) { dataPoint in
PointMark(
x: .value("Date", dataPoint.date),
y: .value("Value", dataPoint.value)
)
}
}
.frame(height: 300)
.padding()
.onAppear(perform: loadData)
}
func loadData() {
print("In Loading Data")
// Load the CSV file
if let url = Bundle.main.url(forResource: "observations", withExtension: "csv") {
do {
let options = CSVReadingOptions(hasHeaderRow: true, delimiter: ",")
var data0 = try DataFrame(contentsOfCSVFile: url, options: options)
let formattingOptions = FormattingOptions(
maximumLineWidth: 200,
maximumCellWidth: 15,
maximumRowCount: 30
)
// print(data0.description(options: formattingOptions))
print("Number of Columns: \(data0.columns.count)")
let columnsSet = ["plant_id", "date", "plot", "plantNumber", "plantCount"]
data0 = try DataFrame(contentsOfCSVFile:url, columns: columnsSet, options: options)
print("Number of Columns (after columnsSet): \(data0.columns.count)")
print("Printing data0")
print(data0.description(options: formattingOptions))
let data = data0.filter { $0["plant_id"] as? Int == 15 }
print("Printing data")
print(data.description(options: formattingOptions))
print(" Number of Rows \(data.rows.count)")
for i in 0 ... data.rows.count {
// print("\(i): \(data["plantCount"][i]!)")
if let plantCount = data["plantCount"][i] as? Int {
print("\(i): \(plantCount)")
} else {
print("\(i): Value not found or invalid type")
}
}
//
// var newDataPoints: [DataPoint] = []
// Here I plan to add the filtered data to DataPoint
//
DispatchQueue.main.async {
dataPoints = newDataPoints
}
} catch {
print("Error reading CSV file: \(error)")
}
}
else
{
print("Didn't load csv file")
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Here is the new dataFrame and print output
Printing data
┏━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ ┃ plant_id ┃ date ┃ plot ┃ plantNumber ┃ plantCount ┃
┃ ┃ <Int> ┃ <String> ┃ <Int> ┃ <Int> ┃ <Int> ┃
┡━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━┩
│ 0 │ 15 │ 2023-09-07 │ 1 │ 5 │ 5 │
│ 32 │ 15 │ 2023-09-07 │ 2 │ 10 │ 10 │
│ 38 │ 15 │ 2023-09-07 │ 2 │ 20 │ 20 │
│ 66 │ 15 │ 2023-09-07 │ 4 │ 25 │ 25 │
│ 77 │ 15 │ 2023-09-07 │ 5 │ 5 │ 5 │
│ 99 │ 15 │ 2023-09-14 │ 7 │ 45 │ 45 │
│ 142 │ 15 │ 2024-05-30 │ 1 │ 20 │ 20 │
│ 162 │ 15 │ 2024-05-30 │ 4 │ 5 │ 5 │
│ 169 │ 15 │ 2024-05-30 │ 5 │ 10 │ 10 │
│ 175 │ 15 │ 2024-05-30 │ 7 │ 10 │ 10 │
│ 188 │ 15 │ 2024-07-11 │ 1 │ 20 │ 40 │
│ 199 │ 15 │ 2024-07-11 │ 2 │ 5 │ 5 │
│ 215 │ 15 │ 2024-07-11 │ 5 │ 20 │ 30 │
│ 220 │ 15 │ 2024-07-11 │ 7 │ 30 │ 40 │
│ 236 │ 15 │ 2024-09-06 │ 1 │ 20 │ 60 │
│ 238 │ 15 │ 2024-09-06 │ 2 │ 30 │ 35 │
│ 248 │ 15 │ 2024-09-06 │ 5 │ 5 │ 35 │
│ 254 │ 15 │ 2024-09-06 │ 7 │ 50 │ 90 │
│ 267 │ 15 │ 2025-05-04 │ 1 │ 10 │ 70 │
│ 273 │ 15 │ 2025-05-04 │ 2 │ 10 │ 45 │
│ 282 │ 15 │ 2025-05-04 │ 5 │ 10 │ 45 │
│ 287 │ 15 │ 2025-05-04 │ 7 │ 30 │ 120 │
│ 292 │ 15 │ 2025-05-04 │ 8 │ 10 │ 0 │
│ 297 │ 15 │ 2925-05-04 │ 3 │ 10 │ 0 │
└─────┴──────────┴────────────┴───────┴─────────────┴────────────┘
24 rows, 5 columns
Number of Rows 24
0: 5
1: 80
2: 1
3: 1
4: 1
5: 3
6: 3
7: 1
8: 6
9: 1
10: 1
11: 1
12: 1
13: 10
14: 50
15: 1
16: 2
17: 1
18: 3
19: 8
20: 5
21: 3
22: 7
23: 2
24: 1
