I am not getting the solution for my coding.

syms q

S=6;

D=4800;

A=25;

Delta=0.2;

F=50;

V=1;

d=50;

tow=0.1;

M=7250;

n=2;

G1=0.2075;

c0=800;

C=((2*n*q)/((2*D)+(q*G1)))*(tow*M);

q=Sqrt(((2*D)*(A+C+(n*F)))/(n*((B+(d*G1))+(S+(d*G1))*((((2-n)*D)/P)+n-1)+(V*G1))))

TOT=(tow*M*(ln(c0/C)))+((D/(n*q))+(G1/(2*n)))*(A+C+(n*F)+(V*n*q))+[(q/2)*((B+(d*G1))+(S+(d*G1))*((((2-n)*D)/P)+n-1))];

Soln=Solve(q, C, TOT)

Answer 1

[Star Strider]

Try this corrected version of your code:

syms q B P 
S=6;
D=4800;
A=25;
Delta=0.2;
F=50;
V=1;
d=50;
tow=0.1;
M=7250;
n=2;
G1=0.2075;
c0=800;
C=((2*n*q)/((2*D)+(q*G1)))*(tow*M);
q=sqrt(((2*D)*(A+C+(n*F)))/(n*((B+(d*G1))+(S+(d*G1))*((((2-n)*D)/P)+n-1)+(V*G1))))
TOT=(tow*M*(log(c0/C)))+((D/(n*q))+(G1/(2*n)))*(A+C+(n*F)+(V*n*q))+[(q/2)*((B+(d*G1))+(S+(d*G1))*((((2-n)*D)/P)+n-1))];
[Soln,Parms,Conds]=solve(q, 'ReturnConditions',1)

[shunmugam hemalatha]

Thankyou for your corrected version. But still I can't get the solution. Also, instead of log function , I want to use ln function. One more data is P=10000.

[Guillaume]

"Also, instead of log function , I want to use ln function"

Perhaps, you should look at the documentation of log. As it clearly says log calculates the natural logarithm (that some may write as ).

[Star Strider]

@shunmugam hemalatha — The solution is:

Soln =
 
-1280000/3121
 
 
Parms =
 
Empty sym: 1-by-0
 
 
Conds =
 
B ~= -10783/400

Use the vpa function to return a decimal fraction.

@Guillaume — Thank you!