Finding solution of a complex equation

Question

Naveen Ramesh 2013-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/73368-finding-solution-of-a-complex-equation

hi guys, I need to find the result of teta and plot it against s_y . but it involves a set of complex equations and i am not able to figure out how to do that. Using syms command to solve the equation didnt work as it was not installed. This is what i want solved:

teta=acosd((((R^2-((R*u*sind(teta))/(R-d))^2)^0.5*(R-d))/(R*u))-(s_y/u));

In here, R,d and u are constants and s_y is defined as

s_y=0:0.1:35;

and i need to plot between

plot(s_y,teta);

I am not abklle to figure the problem out because the RHS also contains the unknown quantity ''teta'' and matlab is not solving the equation. Any help would be greatly appreciated as I am new to matlab and jus learning the bbasics has started.. As always thanks a ton!!

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Answer 1

Vineet 2013-4-24

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在 MATLAB Online 中打开

Since a plot is all you require, initially assign zero to teta. After that, run a loop from 0 to 35 with an interval of 0.1.

teta=0;
for s_y=0:0.1:35
teta=acosd((((R^2-((R*u*sind(teta))/(R-d))^2)^0.5*(R-d))/(R*u))-(s_y/u));
plot(s_y, teta);
hold all
end

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Naveen Ramesh 2013-4-24

Thanks Vineet, The plot comes. But i also need to find the minimum of teta at some s_y and for which i will need the values of teta also !!! how do i do that ?? Thanks in advance !!!

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