Trouble using ezplot and matlabFunction on a symbolic function defined using symengine "piecewise"

6 次查看（过去 30 天）
Ronny Landsverk
Ronny Landsverk 2015-3-29
编辑： Sally Al Khamees 2017-2-21
syms x t;
MP_syntax1 = 'piecewise([x <= 10, x/10], [10 < x <= 30, (30 - x)/20])';
MP_syntax2 = 'ilaplace(2/s^3,s,t)';
f(x) = evalin(symengine,MP_syntax1);
g(t) = evalin(symengine,MP_syntax2);
No trouble with g(t) or other MuPad functions:
ezplot(g(t), [-5,5]);
G = matlabFunction(g(t));
Trying the same to the piecewise, f(x) will not work however.
ezplot(f(x),[0,30]);
F = matlabFunction(f(x));
However, this works
xd = 0:0.1:30;
fd = double(f(xd));
plot(xd,fd);
What is wrong with the other calls using ezplot and matlabFunction for f(x) ?
  4 个评论
显示 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。

采纳的回答

Sally Al Khamees
Sally Al Khamees 2016-12-23
编辑：Sally Al Khamees 2017-2-21
If you have R2016b and the Symbolic Math Toolbox installed, you can just use the piecewise function:
https://www.mathworks.com/help/symbolic/piecewise.html
For example:

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Assumptions 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by