Using solve command, to solve user defined function

Suppose I write a function f(a,b,c,d).

I want to solve it using solve as

solve(b=1/f(a,b,c,d))

but whenever i used the above it gives error, showing use symb variable.

[Torsten]

You defined a,b,c and d as symbolic ? You want to solve b=1/f(a,b,c,d) for b ?

Then

bsol = solve(b*f(a,b,c,d)==1,b)

should work.

Answer 1

[Prateek Rai]

Hi,

You can use "syms" to create symbolic function with four arguments:

syms f(a,b,c,d)

here, f is abstract symbolic function. It does not have symbolic expressions assigned to it.

Then, specify the following formula for f.

% formula for f

After that, you can use "solve" function:

solve(b==1/f(a,b,c,d))

Please refer to syms MathWorks documentation page to find more on creating symbolic functions. You can also refer to solve MathWorks documentation page to learn more about Equations and systems solver.