I am trying to write a MATLAB code. The MATLAB results a warning "Warning: Explicit integral could not be found" and does not solve. Why?

The MATLAB code is written as follows:

syms delm phim kpm nup y1
phi=(pi/180)*39;
del=(pi/180)*26;
beta=0.5;
phim=phi*beta*(1-(y1));
delm=((phim)/(phi))*del;
nup=((asin(sin(delm))/(sin(phim)))+delm)/2;
kpm=(cos(delm)/(1-sin(phim)))*(cos(delm)+sqrt((sin(phim))^2-(sin(delm))^2))*exp(2*nup*tan(phim));
fu=kpm*cos(delm)*y1*y1;
int(fu,0.1,0.2)

MATLAB

Answer 1

[madhan ravi]

Read about matlabFunction() and integral() to solve your integral numerically since the symbolic engine is not able to solve it symbollically.

syms y1
phi=(pi/180)*39;
del=(pi/180)*26;
beta=0.5;
phim=phi*beta*(1-(y1));
delm=((phim)/(phi))*del;
nup=((asin(sin(delm))/(sin(phim)))+delm)/2;
kpm=(cos(delm)/(1-sin(phim)))*(cos(delm)+sqrt((sin(phim))^2-(sin(delm))^2))*exp(2*nup*tan(phim));
fu=matlabFunction(kpm*cos(delm)*y1*y1);
Final_result=integral(fu,0.1,0.2)

command window:

Final_result =

    0.0048

[Akshay Pratap Singh]

Thank you madhan ravi for your help. I really need this solution. Thanks a lot.

[madhan ravi]

Anytime :)