How to plot discontinous function f(x,y)
显示 更早的评论
Please, how do I plot discontinous function of two variables: f(x,y)
z = f(x,y) = x-.8193318913*sin(x)*cos(x)/(cos(x)^2+sinh(y)^2)-(0.2931044702e-2*(0.7500000000e-3*x^2-0.7500000000e-3*y^2+0.1622336517e-1))*sin(x)*cos(x)/(((0.7500000000e-3*x^2-0.7500000000e-3*y^2+0.1622336517e-1)^2+0.2250000000e-5*x^2*y^2)*(cos(x)^2+sinh(y)^2))-0.4396567053e-5*x*y*sinh(y)*cosh(y)/(((0.7500000000e-3*x^2-0.7500000000e-3*y^2+0.1622336517e-1)^2+0.2250000000e-5*x^2*y^2)*(cos(x)^2+sinh(y)^2));
10 个评论
Torsten
2022-9-10
Why discontinuous ?
University Glasgow
2022-9-10
It's a bit mathematically strange. Even if you want use this equation as an example, are the insignificant numbers necessary? I mean, why didn't you remove the insignificant zeros from the equation as you typed and then checked the equation?
By the way, can you point out the discontinuity in the equation? It probably makes the plotting easier.
University Glasgow
2022-9-10
Torsten
2022-9-10
The usual way to plot a function z = f(x,y) is a surface plot.
Look up
for examples.
University Glasgow
2022-9-10
编辑：University Glasgow
2022-9-10
Torsten
2022-9-10
This function has no discontinuities. It is not defined for x = -1 and y = 0 and y = 1. Discontinuities can only appear in the domain where the function is defined.
To plot a function with singularities (like the one above), you must choose x and y such that they don't contain such singularities. Or you must return NaN from the function for those values of x and/or y where f has singularities. NaN values are not plotted.
University Glasgow
2022-9-10
f = @(x,y) 1./(x+1)+1./(y-1);
x = -2:0.05:2;
y = -2:0.05:2;
[X,Y] = meshgrid(x,y);
Z = f(X,Y);
Z(abs(Z)>1e2) = NaN;
surf(X,Y,Z)
University Glasgow
2022-9-10
回答（1 个）
syms x y z
f(x, y) = x-.8193318913*sin(x)*cos(x)/(cos(x)^2+sinh(y)^2)-(0.2931044702e-2*(0.7500000000e-3*x^2-0.7500000000e-3*y^2+0.1622336517e-1))*sin(x)*cos(x)/(((0.7500000000e-3*x^2-0.7500000000e-3*y^2+0.1622336517e-1)^2+0.2250000000e-5*x^2*y^2)*(cos(x)^2+sinh(y)^2))-0.4396567053e-5*x*y*sinh(y)*cosh(y)/(((0.7500000000e-3*x^2-0.7500000000e-3*y^2+0.1622336517e-1)^2+0.2250000000e-5*x^2*y^2)*(cos(x)^2+sinh(y)^2));
ezplot(f)
类别
在 帮助中心 和 File Exchange 中查找有关 2-D and 3-D Plots 的更多信息
2022-9-10
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
