How plot density of function ?

2 次查看（过去 30 天）

salim 2025-1-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2173281-how-plot-density-of-function

评论： Walter Roberson 2025-1-24

i search for finding density plot, i have a function which i saw the density plot i want plot the same i need density plot like the picture

for this function

0.3200000000e1 / ((0.4000000000e0 * x - 0.8e0 * y) ^ 2 + (0.8e0 * x + 0.4e0 * y) ^ 2 + 0.12e1) - 0.5120000000e1 * x ^ 2 / ((0.4000000000e0 * x - 0.8e0 * y) ^ 2 + (0.8e0 * x + 0.4e0 * y) ^ 2 + 0.12e1) ^ 2

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Torsten 2025-1-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2173281-how-plot-density-of-function#answer_1558131

编辑：Torsten 2025-1-24

在 MATLAB Online 中打开

Your function only depends on x, not on x and y.

I'm not sure how you want to make it 2d. Thus I simply defined g(x,y) = f(x)*f(y) and plotted g.

f = @(x)0.3200000000e1 ./ ((0.4000000000e0 .* x - 0.8e0) .^ 2 + (0.8e0 .* x + 0.4e0) .^ 2 + 0.12e1) - 0.5120000000e1 .* x .^ 2 ./ ((0.4000000000e0 .* x - 0.8e0) .^ 2 + (0.8e0 .* x + 0.4e0) .^ 2 + 0.12e1) .^ 2;

x = linspace(-5,5,60);

y = linspace(-5,5,60);

surf(x,y,f(x).*f(y).')

●

contourf(x,y,f(x).*f(y).','Edgecolor','none')

plot(x,f(x))

6 个评论
显示 4更早的评论隐藏 4更早的评论

salim 2025-1-24

编辑：salim 2025-1-24

在 MATLAB Online 中打开

@Torsten i update the graph i get the same graph as the paper by taking t=0 and i used range of y, thanks for your comment is help me so much

0.3200000000e1 / ((0.4000000000e0 * x - 0.8e0 * y) ^ 2 + (0.8e0 * x + 0.4e0 * y) ^ 2 + 0.12e1) - 0.5120000000e1 * x ^ 2 / ((0.4000000000e0 * x - 0.8e0 * y) ^ 2 + (0.8e0 * x + 0.4e0 * y) ^ 2 + 0.12e1) ^ 2