在MATLAB中绘制椭圆

问题描述

具有以下样式的椭圆的参数方程式:

For the parametric equation of an ellipse, which owns the following style:

或者可以写成矩阵形式

现在我想用MATLAB中的系数矩阵[a b c; d e f]绘制它

Now I want to draw it by the coefficient matrix [a b c; d e f] in MATLAB

方法1 :plot

function drawEllipse1(mat)
    t = linspace(0,2*pi,101);
    vec = [sin(t); cos(t); ones(1,length(t))];

    %calculate the coordinates of ellipse
    ellipse = mat1*vec;
    ellipseX = ellipse(1,:);
    ellipseY = ellipse(2,:);
    plot(ellipseX,ellipseY)

end

方法2 :ezplot

function drawEllipse2(mat)
    syms t;
    ellipseExpr = mat*[sin(t); cos(t); 1];
    %pass a function handle
    ezplot(@(t)ellipseExpr(1),@(t)ellipseExpr(2),[0,2*pi])

end

但是，drawEllipse2()无法正常绘制椭圆吗?我不知道为什么.

However, drawEllipse2()cannot draw a ellipse normally? I didn't know why.

mat = [1 2 3;4 5 6];
drawEllipse2(mat)

推荐答案

我不确定，但是我认为这是因为您如何传递该函数句柄.如果您只是想做:

I'm not completely sure, but i think its because how you are passing that function handle.If you were to simply do:

ezplot(ellipseExpr(1),ellipseExpr(2),[0,2*pi])

您得到相同的椭圆.

you get the same ellipse.

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