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I am not getting the solution for my coding.

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shunmugam hemalatha
评论： Star Strider 2020-3-26
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)

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回答（1 个）

Star Strider
Star Strider 2020-3-26
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)
  3 个评论
显示 1更早的评论
Guillaume
Guillaume 2020-3-26
"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
Star Strider 2020-3-26
@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!

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