matlabFunction with syms do not evaluate eqv?

Good day,

Som insight way there is no evaluation for current symbolic function?

When entering…

syms p1 p2 v1 v2 gma
eqv = p1*v1^gma==p2*v2^gma;
p2 = matlabFunction(eqv,p2)

The output is the same function, without evaluation for the requested variable. While it should be p2=p1*(v1/v2)^gma or p2=p1*v1^gma/v2^gma... Is there some error in understanding of the use of current functions?

Answer 1

[Steven Lord]

For what you're describing, matlabFunction is not the right tool. solve is the right tool.

[Andrew]

Thank You for spotting my mistyping.

u=symunit;
syms p1 p2 V1 V2 gma
eqn = p1*V1^gma==p2*V2^gma;
p2 = matlabFunction(solve(eqn,p2))
V1 = .15*u.m^3;
p1 = 2*u.bar;
V2 = .02*u.m^3;
gma=1.4;
p2=p2(p1,V1,V2,gma)

p2 =

1.4000*(2*[bar])^(0.0200*[m]^3)/(0.1500*[m]^3)^(0.0200*[m]^3)

Some hint whay ans is in "long form/expresion", when it must be like with

u=symunit;
V1 = .15*u.m^3;
p1 = 2*u.bar;
V2 = .02*u.m^3;
gma=1.4;
p2=p1*(V1/V2)^gma

p2 =

33.5827*[bar]

[Steven Lord]

For future reference we're discussing that over in this other Answers post.