How to improve the accuracy of drawing, especially for infinite functions?
2 次查看(过去 30 天)
显示 更早的评论
in some plot assignments,we can use 'ezplot' to plot the more accurate figure but for infinite functions the 'ezplot' still can't plot it accurately,so how can we improve the accuracy of drawing, especially for infinite functions?
functions and codes are as this
syms m1;
g=9.8;
h=20;
hgang=20;
omega=2;
nu=omega^2*hgang/g;
g = @(m1) (i*m1)*tanh(i*m1)-nu;
fplot(g,[-10,20])
ylim([-60,40])
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/219149/image.png)
0 个评论
采纳的回答
Walter Roberson
2019-5-13
Use fplot() instead of ezplot()
And skip using inline(): inline() has been recommended against since MATLAB 5.1
11 个评论
Walter Roberson
2022-1-13
If you have discontinuities and you want to use plot(), then you need to take one of two approaches:
- Detect the discontinuities (somehow) and insert a nan at that location so that MATLAB stops drawing there; OR
- Use your knowledge of the formulas to draw the lines in pieces, using hold on
If you use the Symbolic Toolbox and you write in terms of piecewise() then fplot() will detect the discontinuities and use vertical lines.
syms a b c d x real
part0 = piecewise(x<=a | x >= d, 0, 0);
part1 = piecewise(x>b & x < c, 1, 0);
part2 = piecewise(x > a & x <= b, (x-a)./(b-a), 0);
part3 = piecewise(x > b & x <= d, (d-x)./(d-c), 0);
f = part0 + part1 + part2 + part3
m = 10;
v1=unifrnd(0,1,1,m);
l1=unifrnd(0,1,1,m);
u1=unifrnd(1,2,1,m);
A = 0.1*l1';
B = 2*v1';
C = 3*v1';
D = 4*u1';
y = subs(f,{a,b,c,d}, {A,B,C,D});
fplot(y, [-1 3])
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!