Question

我的代码会创建数据点的三个“行”，但不会将这些点连接成行！我查看了教程，并尝试了绘图（Time，CurrentSpeed1，' - '）和添加标记之类的东西，但无论如何，它总是有三个不同颜色的点系列，它们没有连接。这就是我得到的：

Time = 0;

while (Acceleration1 > 0.012 || Acceleration2 > 0.012 || Acceleration3 > 0.012)
    Drag = (1/2) * AirDensity * (CurrentSpeed1^2) * DragCoefficient * Area;
    Force = EnginePower/CurrentSpeed1;
    Acceleration1 = (Force-Drag)/EmptyWeight;
    CurrentSpeed1 = CurrentSpeed1 + Acceleration1;

    Drag = (1/2) * AirDensity * (CurrentSpeed2^2) * DragCoefficient * Area;
    Force = EnginePower/CurrentSpeed2;
    Acceleration2 = (Force-Drag)/HalfWeight;
    CurrentSpeed2 = CurrentSpeed2 + Acceleration2;    

    Drag = (1/2) * AirDensity * (CurrentSpeed3^2) * DragCoefficient * Area;
    Force = EnginePower/CurrentSpeed3;
    Acceleration3 = (Force-Drag)/FullWeight;
    CurrentSpeed3 = CurrentSpeed3 + Acceleration3;

    plot(Time, CurrentSpeed1, Time, CurrentSpeed2, Time, CurrentSpeed3);

    Time = Time + 1;
    hold on
end

xlabel('Time (Seconds)');
ylabel('Speed (m/s)');
hold off

为什么哦为什么？干杯：）

Answer 1

您的时间和速度变量是单个值，因此当您绘制图表时，您获得积分。要绘制线条，您需要一组值。例如：

figure
hold all
plot(3, 4, 'o') % plot a point
plot(1:10, 1:10) % plot a line

在循环内部，您需要将计算值存储在数组中，然后在循环后绘制数组。

Answer 2

正如@shoelzer所说，你需要一组值。以下是代码的简化版本，以显示示例：

Time = 0;
CurrentSpeed1=0;
CurrentSpeed2=0;
CurrentSpeed3=0;
while (Time<10)
    OldTime=Time;
    Time = Time + 1;

    OldSpeed1=CurrentSpeed1;
    CurrentSpeed1 = Time+1;

    OldSpeed2=CurrentSpeed2;
    CurrentSpeed2 = Time+2;    

    OldSpeed3=CurrentSpeed2;
    CurrentSpeed3 = Time+3;


    plot([OldTime Time], [OldSpeed1 CurrentSpeed1], [OldTime Time], [OldSpeed2 CurrentSpeed2], [OldTime Time], [OldSpeed3 CurrentSpeed3]);

    hold on
end

xlabel('Time (Seconds)');
ylabel('Speed (m/s)');
hold off

我只是确保存储'旧'点，然后我可以将它们与新点连接

为什么Matlab中的2D数据点不能连接成线？

2 个答案: