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# Edit detail for SandboxErik revision 1 of 1

 1 Editor: hemmecke Time: 2018/05/24 20:47:26 GMT+0 Note:

changed:
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How do I find the n-root of a number?

You can do it symbolically or numerically.

\begin{axiom}
nthRoot(4, 7)
nthRoot(4.0, 7)
\end{axiom}

How do I solve inequalites?

FriCAS lacks support for this.

How do I find the angle in a scalar product? Degrees and radians.

Homework! Program the mathematical formula and you are done.

Is it possible to find the logarithm with base 10, 2 and 3 etc?

https://en.wikipedia.org/wiki/Logarithm#Change_of_base

In FriCAS 'log' denotes the natural logarithm and '%e' denotes 'exp(1)'.
\begin{axiom}
log %e
\end{axiom}

The lenght of a vector?

Just enter the formula.

\begin{axiom}
v := vector [1,3,-5]
len := sqrt dot(v,v)
\end{axiom}

How can I rewrite a expression to with respect to a variable? For example v=H*r and to make axiom rewrite this as r=H/r?

Solve for it.

\begin{axiom}
)clear prop v
solve(v=H*r, r)
\end{axiom}

And I guess lcm is defined for only 2 numbers and not 3?

You can compute the lcm of a list of values.

\begin{axiom}
lst := [n for n in 1..10]
lcm lst
\end{axiom}

I realize that this is a lot of questions, so it is completely okay if you
answer each questions short. I have tried a lot on my own, but  need hints
to understand the whole picture. I will also try to understand the coding
of the programme afterwards:)It took me a short time to become natural with
the programme, so thanks a lot!



## How do I find the n-root of a number?

You can do it symbolically or numerically.

fricas
nthRoot(4, 7) (1)
Type: AlgebraicNumber?
fricas
nthRoot(4.0, 7) (2)
Type: Float

## How do I solve inequalites?

FriCAS lacks support for this.

## How do I find the angle in a scalar product? Degrees and radians.

Homework! Program the mathematical formula and you are done.

## Is it possible to find the logarithm with base 10, 2 and 3 etc?

In FriCAS log denotes the natural logarithm and %e denotes exp(1).

fricas
log %e (3)
Type: Expression(Integer)

## The lenght of a vector?

Just enter the formula.

fricas
v := vector [1,3,-5] (4)
Type: Vector(Integer)
fricas
len := sqrt dot(v,v) (5)
Type: AlgebraicNumber?

## How can I rewrite a expression to with respect to a variable? For example v=H*r and to make axiom rewrite this as r=H/r?

Solve for it.

fricas
)clear prop v
solve(v=H*r, r) (6)
Type: List(Equation(Fraction(Polynomial(Integer))))

## And I guess lcm is defined for only 2 numbers and not 3?

You can compute the lcm of a list of values.

fricas
lst := [n for n in 1..10] (7)
Type: List(PositiveInteger?)
fricas
lcm lst (8)
Type: PositiveInteger?

I realize that this is a lot of questions, so it is completely okay if you answer each questions short. I have tried a lot on my own, but need hints to understand the whole picture. I will also try to understand the coding of the programme afterwards:)It took me a short time to become natural with the programme, so thanks a lot!