Regarding solving an equation

I have done a program in MATLAB to solve an equation as mentioned below,

r1 = 0.7

r2 = 0.704

r3 = 0.825

r4 = 0.833

ki = 13.8564

Ri = r1*log(r2/r1)/ki

kins = 0.0006

Rins = r1*log(r3/r2)/kins

ko = 39.8397

Ro = r1*log(r4/r3)/ko

ho = 10

Rco = (r1/r4)*1/ho

U1 = 1 /(Ri+Rins+Ro+Rco)

R1 = 1/U1

Ti = 77

To = 313

delTt = To - Ti

phi = solve('R1*x + 0.033165331*x^0.8 -delTt')

phi1 = real(phi)

Problem is that I am not getting its solution but if I seperate the program and put the value of R1 and delTt then I am getting the answer. so, please clarify me that, why I am not getting the answer with this current program ?

Answer 1

[Thomas]

try the equation as

 syms x  

 phi = solve(R1*x + 0.033165331*x^0.8 -delTt)  %without '...'

 phi1 = real(phi)

[Walter Roberson]

You would need to add

syms x

above that.

[Thomas]

Thanks Walter.. edited my answer above.. had it on command line line.. didn't transfer it here..

[Shripad]

Thanks for helping