Help on solving equation?

on 29 Apr 2019

on 29 Apr 2019

Stephan (view profile)

Hello,
I need urgent help for the small code belwo to solave the equation I jave tried but I always seeing this error ((Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters)).
Code is belwo:
A1=1.825*10^6;
Zi=67;
M=123;
B=50.29;
a=5;
Z=134;
AO0=2.6;
P0=54.6;
C=12;
Ka=2.45;
V=10^((-A1*(Zi^2)*sqrt(M))/(1+B*a*sqrt(M)));
syms A
eqn=AO0-(C*V*(A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0))-(AO0/2)))*(Ka/AO0)-(A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0)));
sola = solve(eqn, A)

KALYAN ACHARJYA

KALYAN ACHARJYA (view profile)

on 29 Apr 2019
My suggestion break the eqn statement in multiple parts, because it is confusing check.

R2018a

Stephan (view profile)

on 29 Apr 2019

Hi,
try:
A1=1.825*10^6;
Zi=67;
M=123;
B=50.29;
a=5;
Z=134;
AO0=2.6;
P0=54.6;
C=12;
Ka=2.45;
V=10^((-A1*(Zi^2)*sqrt(M))/(1+B*a*sqrt(M)));
syms A
eqn=AO0-C*V*A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0))-(AO0/2)))*(Ka/AO0)-(A*(((1-Z*C^0.5)^(-1))+((AO0-P0)/(2*A))/(1+((AO0-P0)/(2*AO0)))));
sola = double(solve(eqn, A))
result is:
sola =
133.8103
Does this appear to be a correct result? If not check the parenthesis of your equation.
Best regards
Stephan