Solving for a function in Maxima (software)
$begingroup$
I'm using the Maxima software to solve an equation (involving derivatives) and I basically have an equation of the following form (although more complicated because there are more terms in my equation):
Eq: $Af(r) = Bdisplaystylefrac{d g(r)}{dr}$.
Now, I would like to solve this for $f$ and I tried using commands like "funcsolve(Eq, f(r))", which when applied to the above equation gives the output:
Outp: $f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
But this is juste an output and the function $f$ is not yet defined, so I do:
define(f(r), rhs(Outp));
and it defines the function $f$ as:
$f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
The problem is that when I evaluate $f$ in a point $a$, it gives the following:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{da}$,
whereas I would obviously like to have:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{dr}$.
Does anyone know how to resolve this problem?
Thanks in advance for any help
maxima-software
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
$endgroup$
add a comment |
$begingroup$
I'm using the Maxima software to solve an equation (involving derivatives) and I basically have an equation of the following form (although more complicated because there are more terms in my equation):
Eq: $Af(r) = Bdisplaystylefrac{d g(r)}{dr}$.
Now, I would like to solve this for $f$ and I tried using commands like "funcsolve(Eq, f(r))", which when applied to the above equation gives the output:
Outp: $f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
But this is juste an output and the function $f$ is not yet defined, so I do:
define(f(r), rhs(Outp));
and it defines the function $f$ as:
$f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
The problem is that when I evaluate $f$ in a point $a$, it gives the following:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{da}$,
whereas I would obviously like to have:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{dr}$.
Does anyone know how to resolve this problem?
Thanks in advance for any help
maxima-software
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
$endgroup$
add a comment |
$begingroup$
I'm using the Maxima software to solve an equation (involving derivatives) and I basically have an equation of the following form (although more complicated because there are more terms in my equation):
Eq: $Af(r) = Bdisplaystylefrac{d g(r)}{dr}$.
Now, I would like to solve this for $f$ and I tried using commands like "funcsolve(Eq, f(r))", which when applied to the above equation gives the output:
Outp: $f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
But this is juste an output and the function $f$ is not yet defined, so I do:
define(f(r), rhs(Outp));
and it defines the function $f$ as:
$f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
The problem is that when I evaluate $f$ in a point $a$, it gives the following:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{da}$,
whereas I would obviously like to have:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{dr}$.
Does anyone know how to resolve this problem?
Thanks in advance for any help
maxima-software
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
$endgroup$
I'm using the Maxima software to solve an equation (involving derivatives) and I basically have an equation of the following form (although more complicated because there are more terms in my equation):
Eq: $Af(r) = Bdisplaystylefrac{d g(r)}{dr}$.
Now, I would like to solve this for $f$ and I tried using commands like "funcsolve(Eq, f(r))", which when applied to the above equation gives the output:
Outp: $f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
But this is juste an output and the function $f$ is not yet defined, so I do:
define(f(r), rhs(Outp));
and it defines the function $f$ as:
$f(r) = displaystylefrac{B}{A} frac{d g(r)}{dr}$.
The problem is that when I evaluate $f$ in a point $a$, it gives the following:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{da}$,
whereas I would obviously like to have:
$f(a) = displaystylefrac{B}{A} frac{d g(a)}{dr}$.
Does anyone know how to resolve this problem?
Thanks in advance for any help
maxima-software
maxima-software
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
asked Dec 20 '18 at 16:14
MichaëlMichaël
326
326
add a comment |
add a comment |
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