## 135 Reputation

13 years, 262 days

## how to fix this error in Equilibrium poi...

Maple

rhs; with(DEtools);# to find the equilibrium points
fx1 = sigma1*y-beta1*x1*y-v1*x1-mu1*x1+(2*alphad+alphaa)*k*A*s; fx2 = alpha*v2*x1*z-beta2*x2*y-mu2*x2+v1*x1; fy = sigma2*(beta1*x1*y+beta2*x2*y)-mu4*y-mu5*y^2; fz = sigma3+y*(kz+y)-mu3*z-v2*z*x2; fs = (k*(alphas-alphad)-mus)*s;

eqs := solve({fs, fx1, fx2, fy, fz}, {s, x1, x2, y, z})

L := map(subs, [eqs], [x1, x2, y, z, s])

J := unapply(VectorCalculus:-Jacobian([fx1, fx2, fy, fz, fs], [x1, x2, y, z, s]), x1, x2, y, z, s); J(x1, x2, y, z, s)

## solve system with variables then plot3d...

Maple 2017

hi

I have a linear system with varibles trying to plot 3d the solutions x, y, z

here is my code: linear_var.mw

*******************************

restart;

Omega:=10:N:=0.5:M:=sqrt(N(N+1)):

a11:=0.5*(1+2*N)+M*cos(phi):
a12:=-0.5*((1+theta)^3+(1-theta)^3):a13:=-0.5*(N+M*cos(phi))*((1+theta)^3-(1-theta)^3): a21:=M*sin(phi): a22:=(-(1+2*N)+0.5*M*cos(phi))*((1+theta)^3+(1-theta)^3): a23:=-(Omega+0.5*((1+theta)^3-(1-theta)^3)*M*sin(phi)): a31:=0.25*((1+theta)^3-(1-theta)^3): a32:=Omega: a33:=-0.5-(N+0.25)*((1+theta)^3+(1-theta)^3): b1:=-0.5*a31: b2:=0: b3:=0.25+((1+theta)^3+(1-theta)^3)/8:

slove([a11*x+a12*y+a13*z=b1,a21*x+a22*y+a23*z=b2,a31*x+a32*y+a33*z=b3[,[x,y,z]);
Error, unable to match delimiters
Typesetting:-mambiguous(Typesetting:-mambiguous(slovelparlsqba11

sdotx + a12sdoty + a13sdotzequalsb1commaa21sdotx + a22sdoty +

a23sdotzequalsb2commaa31sdotx + a32sdoty + a33sdotzequalsb3lsqb

comma(xyz)rparsemi,

Typesetting:-merror("unable to match delimiters")))

plot3d(x, theta = .1 .. 5, phi = 0 .. 2*Pi, axes = boxed);
plot3d(y, theta = .1 .. 5, phi = 0 .. 2*Pi, axes = boxed); plot3d(z, theta = .1 .. 5, phi = 0 .. 2*Pi, axes = boxed);

## contour plot at ...

Maple 2017

I tryning to to plot 3d and then contour plot of the function N vs alpha

N_vs_alpha.mw

## how can solve the problem when it says ...

Maple 2017

Hhow can i solve R it says here root of

Calculate.mws

## how to compute symbolic Expressions ...

Maple 2017

H all expert

first this Expression

ni := diff(Q(x, t), t)+a*Q*(x, t)*(diff(Q(x, t), x))+b*(diff(Q(x, t), t\$3))+d*(diff(Q(x, t), t\$5)) = 0

then I want to solve  diff(Q(x, t), t\$5)

diff(Q(x, t), t\$5) = solve(ni, diff(Q(x, t), t\$5))#eq2

p (x, t) :=H1(t)*Q(x*H2(t), H3(t)) #assumption

k := diff(p(x, t), t)+a*p(x, t)*(diff(p(x, t), x))+diff(p(x, t), t\$3)+d*(diff(p(x, t), t\$5))+c*p(x, t) #eq3

r := subs(diff(Q(x, t), t\$5), k) #subs eq2 in eq3

i recived error

SUBS1.mw

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