How to call function for every iteration of the for loop

Question

Varun Biradar 2020-2-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505795-how-to-call-function-for-every-iteration-of-the-for-loop

评论： Varun Biradar 2020-2-16

Hi I am trying to solve set of nonlinear equations using fsolve function, but for 4 different cases. I defined all the preset variables in a row matrix, but when I try to call the function fsolve it only returns the value by using the 4th case instead of returning values for all 4 cases. How do I call a function for every iteration of the for loop? I am pretty new to MATLAB so any help would be appreciated.

Code:

x0 = [20; 60]; % initial guesses for x(1) and x(2).
options=optimset('Display','iter');
x = fsolve(@myfun,x0,options)
function f=myfun(x0)
x=x0;
A_all = [1.3 1.9 1.8 0.10];
m_all = [80 84 92 25];
j=1;
for Cd= [0.3 1.14 0.29 0.045];
	A=A_all(j); %m2
	m=m_all(j); %kg
	g=9.807; %m/s2
	d= 1.225; %kg/m3
	f1=sqrt((2*m*g)/(d*A*Cd))*tanh(x(1)* sqrt((g*d*Cd*A)/(2*m)))- x(2);
	f2=((2*m)/(d*A*Cd))*(log(abs(cosh(x(1)*sqrt((d*A*Cd*g)/(2*m))))))-1000;
	f=[f1 f2];
	j=j+1; %go to the next object
end
end

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Answer 1

Image Analyst 2020-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/505795-how-to-call-function-for-every-iteration-of-the-for-loop#answer_415829

在 MATLAB Online 中打开

Try indexing f to put the f1 and f2 on different rows:

f(j, 1:2) = [f1 f2];

assuming f1 and f2 are scalars, not vectors

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Varun Biradar 2020-2-16

I need to get values of x1 and X2 for j=1,2,3,4 but I only get x1 and X2 for j=4. When I call the function. Indexing f is still not giving me the results I'm expecting.

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