## 25 Reputation

5 years, 102 days

## compute determinant ...

Maple 17

hello,

so i'm trying to compute the determinant of a Matrix(7*7) to obtain a single equation ( dispersion equation ) that i need to use for further investigation.

But unfortunately for a certain value Bi=1(i need this value ) i get 0.it would be nice if some can help me

Determinant.mw

## how to use fsolve?...

Maple 17

hello dear maple maple users.

I'm trying to solve this system of equations using fsolve but i'm geting this unrealistic curve.

I don't know exactly how, can help me understand!!!!!.

fsolve.mw

## How do i find a relations between two ex...

Maple

hello dear fellows maple users,

I need help to find a relation between multiples expressions (A,B..etc) and one term (R). (otherwise, I want to write those expressions in terms of R).

```#A is given by

A:=nu^(2/3)*B/(g^(1/3)*(sin(beta))^(1/3)*h):

#and R is defined as:

R:=h^3*g*sin(beta)/(3*nu^2):```

I hope I expressed myself clearly.

## how to use fsolve in maple?...

Maple

i wanna solve a system of equations using ''fsolve'', I have found this example:

fsolve({2*x-x*y=0,-y+3*x*y=0},{x,y}, {x=0.1..5,y=0..4});

but i wanna understand how does this work,and what is the signification of term

## Solve equations...

Maple 17

I'm trying to solve this to set of equations :

```EQ1:=-1958143.922*k*wr+2468.8339*k^3*wr-0.9481118254e16*k^2-114000.8376*k^4:

EQ2 :=-1186578.220*R*k^2*wr-312683.0293*k^5-288960.9621*k^3*R:
```

using a loop for different value of R in the range this range (wr=0..10,k=0..10)

```eqns:={EQ1,EQ2}:
for i from 1 by 1 to 101 do R:=(i-1):S:=fsolve(eqns,{k, wr},{wr=0..10,k=0..10}):v(i):=(subs(S,(wr)));w(i):=(subs(S,(k)))end do:
```

but i get this instead :

```Error, invalid input: subs received fsolve({-312683.0293*k^5, -1958143.922*k*wr+2468.8339*k^3*wr-0.9481118254e16*k^2-114000.8376*k^4}, {k, wr}, {k = 0 .. 10, wr = 0 .. 10}), which is not valid for its 1st argument
```

is there another way to solves this equations more easly .

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