我对python很新。我想使用KMean代码，我想安装getBarGap()或import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.StackedBarChart;
import javafx.scene.chart.XYChart;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class MainApp extends Application
{
private StackedBarChart<String, Number> stackedChart;
private List<EventsObj> eventsObj;
@Override
public void start(Stage stage) throws Exception
{
createStackedChart();
List<EventsObj> testData = generateTestData();
addStackedChartData(testData);
HBox hb = new HBox();
hb.getChildren().add(stackedChart);
Scene scene = new Scene(hb);
stage.setTitle("JavaFX and Maven");
stage.setScene(scene);
stage.show();
}
public static void main(String[] args)
{
launch(args);
}
private void createStackedChart()
{
CategoryAxis xAxis = new CategoryAxis();
xAxis.setLabel("Days");
NumberAxis yAxis = new NumberAxis();
stackedChart = new StackedBarChart<>(xAxis, yAxis);
stackedChart.setCategoryGap(20);
stackedChart.widthProperty().addListener((obs, b, b1) ->
{
// Chart Bar column is not automatically resized. We need to wait for next JavaFX releases to fix this.
Platform.runLater(() -> setMaxBarWidth(stackedChart, xAxis, 40, 10));
});
}
private List<EventsObj> generateTestData()
{
eventsObj = new ArrayList<>();
for (int i = 0; i < 5; i++)
{
eventsObj.add(new EventsObj(String.valueOf(randomDate()), random(2, 60), random(2, 60), random(2, 60), random(2, 60)));
}
return eventsObj;
}
public static int random(int lowerBound, int upperBound)
{
return (lowerBound + (int) Math.round(Math.random() * (upperBound - lowerBound)));
}
private LocalDate randomDate()
{
Random random = new Random();
int minDay = (int) LocalDate.of(1900, 1, 1).toEpochDay();
int maxDay = (int) LocalDate.of(2015, 1, 1).toEpochDay();
long randomDay = minDay + random.nextInt(maxDay - minDay);
LocalDate randomBirthDate = LocalDate.ofEpochDay(randomDay);
return randomBirthDate;
}
private void addStackedChartData(List<EventsObj> data)
{
List<XYChart.Series<String, Number>> dataSeries = new ArrayList<>(data.size());
for (EventsObj data1 : data)
{
final XYChart.Series<String, Number> series1 = new XYChart.Series<>();
series1.setName(data1.getDate());
series1.getData().setAll(
new XYChart.Data<>("Info", data1.getInfo()));
dataSeries.add(series1);
}
stackedChart.getData().setAll(dataSeries);
}
private void setMaxBarWidth(StackedBarChart<String, Number> bc, CategoryAxis xAxis, double maxBarWidth, double minCategoryGap)
{
double barWidth = 0;
do
{
double catSpace = xAxis.getCategorySpacing();
double avilableBarSpace = catSpace - (bc.getCategoryGap() + bc.getCategoryGap());
barWidth = (avilableBarSpace / bc.getData().size()) - bc.getCategoryGap();
if (barWidth > maxBarWidth)
{
avilableBarSpace = (maxBarWidth + bc.getCategoryGap()) * bc.getData().size();
bc.setCategoryGap(catSpace - avilableBarSpace - bc.getCategoryGap());
}
}
while (barWidth > maxBarWidth);
do
{
double catSpace = xAxis.getCategorySpacing();
double avilableBarSpace = catSpace - (minCategoryGap + bc.getCategoryGap());
barWidth = Math.min(maxBarWidth, (avilableBarSpace / bc.getData().size()) - bc.getCategoryGap());
avilableBarSpace = (barWidth + bc.getCategoryGap()) * bc.getData().size();
bc.setCategoryGap(catSpace - avilableBarSpace - bc.getCategoryGap());
}
while (barWidth < maxBarWidth && bc.getCategoryGap() > minCategoryGap);
}
}
。
我使用此代码尝试安装这些软件包：
scikit-learn但我收到了这个错误：
sklearn问题的原因是什么？
答案 0 :(得分：6)
pip install -U <package>是pip install --upgrade <package>的缩写，会将<package>升级到pip repo中最新的稳定版本。
pip install <package>会在pip repo中安装<package>的最新稳定版本。
不同之处在于升级与安装。你想要后者。
scikit-learn需要scipy和numpy，因此以下是您应该发出的命令：
pip install numpy
pip install scipy
pip install scikit-learn
如果您已有任何依赖项，只需在-U和程序包名称之间插入pip install。
如果您使用的是Python 3.x，请将pip替换为pip3。