How can i find results of functions for symbolic points?

Question

Volkan Yangin 2020-10-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/631169-how-can-i-find-results-of-functions-for-symbolic-points

回答： Ameer Hamza 2020-10-30

Hi,

I have 2 different function and i don't know how i can get function results for 3 symbolic points. Final state of the functions should be symbolic.

Thanks a lot!

Points:

[x1; x2; u]=[1 - (1428408862663155*t)/140737488355328; 1 - (4686410245993191*t)/18014398509481984; 0]

Functions:

x1_dot =(1936*sin((3*atan((5679527*x2)/156250000 - (17263*x1)/625000 + (33*atan((61*x1)/2500 - (20069*x2)/625000))/250))/2))/1025 - 10*x2 + (1936*sin((3*atan((17263*u)/62500 - (17263*x1)/625000 - (6404573*x2)/156250000 + (33*atan((61*x1)/2500 - (61*u)/250 + (22631*x2)/625000))/250))/2))/1025
x2_dot =(955416*sin((3*atan((5679527*x2)/156250000 - (17263*x1)/625000 + (33*atan((61*x1)/2500 - (20069*x2)/625000))/250))/2))/333125 + (1077384*sin((3*atan((17263*u)/62500 - (17263*x1)/625000 - (6404573*x2)/156250000 + (33*atan((61*x1)/2500 - (61*u)/250 + (22631*x2)/625000))/250))/2))/333125

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Answer 1

Ameer Hamza 2020-10-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/631169-how-can-i-find-results-of-functions-for-symbolic-points#answer_528894

在 MATLAB Online 中打开

You need to assign value of x1, x2, and u seperately. The following code works without error

syms t
x1 = 1 - (1428408862663155*t)/140737488355328;
x2 = 1 - (4686410245993191*t)/18014398509481984;
u = 0;
x1_dot = (1936*sin((3*atan((5679527*x2)/156250000 - (17263*x1)/625000 + (33*atan((61*x1)/2500 - (20069*x2)/625000))/250))/2))/1025 - 10*x2 + (1936*sin((3*atan((17263*u)/62500 - (17263*x1)/625000 - (6404573*x2)/156250000 + (33*atan((61*x1)/2500 - (61*u)/250 + (22631*x2)/625000))/250))/2))/1025
x2_dot = (955416*sin((3*atan((5679527*x2)/156250000 - (17263*x1)/625000 + (33*atan((61*x1)/2500 - (20069*x2)/625000))/250))/2))/333125 + (1077384*sin((3*atan((17263*u)/62500 - (17263*x1)/625000 - (6404573*x2)/156250000 + (33*atan((61*x1)/2500 - (61*u)/250 + (22631*x2)/625000))/250))/2))/333125

Output from live editor