How do I correctly use vpasolve? (2024)

But don't I just have one equation, the one inside the vpasolve function? I separated into parts, but overall it is just one equation, one equality, no?

Or am I missing something (I probably am)? Thanks for your help.

Any one call to vpasolve() or solve() is a call to solve simultaneous equations.

does not try to independently solve [4*x+5==0] and [3*x-7==2]: it tries to find a single combination of values of the variables that solves all of the equations at the same time. You would not expect vpasolve( [4*x+5*y==9, 3*x - 7*y == 2] ) to produce independent solutions for each of the equations, and the action of solve() and vpasolve() for multiple equations does not change just because the multiple equations only have a single variable between them.

Your comments say "new_freq is an array of values" so if you work through, M_mag./C1 == nume./denom is an array of equations. A single solve() call would try to find a single x that solves all of the equations at the same time. A single vpasolve() call will simply refuse to handle the situation (except for polynomials)

So you need to ask vpasolve() to solve each of the equations one-by-one . Which is what my arrayfun() Answer does.

You'll only get an answer if n can be complex-valued (which I doubt the OP aims at).

Implicitly, you have the equations

and

And you have a symbolic variable n.

Whether you get a solution that fits your needs depends on whether you accept a complex-valued n or not.

n is a complex number. Can I change my code for a complex result?

Thank you very much for your help.

@Walter Roberson that makes sense, I thought that it would solve one-by-one. I didn't understand the limitations of this tool. How can I go around this to have this equation solved for an array? Would a for loop be needed?

Dear @Walter Roberson, I have never understood how arrafun works, but it seems to be giving me the right answer. Have you got any link that explain the function written above?

Thank you for your help.

PS: For some reason, the first cell in the cell array separates the complex from the real part of the number.But that can be easily sorted.

is effectively the same as

and

is effectively the same as

and

is effectively the same as

So you input a function handle (typically), and one or more arrays that must be exactly the same size. The output is the same size as the array. When 'uniform', 0 is specified, the output is a cell array containing the result of executing the function on each corresponding sets of values from the array in turn. If 'uniform', 0 is not specified, the output is a regular array containing the result of executing the function on each corresponding set of values from the array in turn.