dearcia

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These are questions asked by dearcia

Hi everyone
I am a learner using the maple program and I have a problem drawing multiple lines with different styles. I have tried the following:

restart; with(VectorCalculus); with(LinearAlgebra); with(DEtools);
F0 := 0; zeta := .25; w := 1; Omega := 1; m := 1;

ode1 := diff(x(t), t) = y(t); ode2 := diff(y(t), t) = F0*cos(Omega*t)/m-2*zeta*w*y(t)-w^2*x(t);

DEplot([ode1, ode2], [x(t), y(t)], t = 0 .. 10, x = -100 .. 100, y = -100 .. 100, [[x(0) = 0, y(0) = 50], [x(0) = 9, y(0) = 25], [x(0) = 85, y(0) = 20], [x(0) = .25, y(0) = .5], [x(0) = 7, y(0) = 5]], linestyle = [dash, dashdot, dot, longdash, spacedash], linecolor = [red, green, black, navy, maroon], thickness = 2, axes = normal, labels = [x(t), y(t)], arrows = medium, stepsize = 0.1e-1);

I would like to obtain in the graph that each trajectory has a different type of line.

On the other hand I wonder: Is it possible to use the options boxed and normal at the same time?

Greetings and thank you all

Good afternoon everybody,

I am a beginer user in maple and I am having problems to plot a system of differential equations. My code is

----------------------

restart; with(VectorCalculus); with(LinearAlgebra); with(DEtools);
> p := 2*u*x*y^2; q := (x-1)/x;
> doth := simplify(-(sqrt(6)*x^3*(y-1)^2+u*((3+sqrt(6))*x^3*(y-1)^2+3*y^2-9*x*y^2+3*x^2*(y^2+2*y-1)))/p); ddotphi := simplify((y-1)*(sqrt(6)*x*y^2*(x-1)+u*(3*y^2-(6+sqrt(6))*x*y^2+x^2*((3+sqrt(6))*y^2+6*y-3)))/p);

>ode1 := diff(x(t), t) = x(t)*(1-x(t))*doth-x(t)^2*ddotphi/sqrt(6); ode2 := diff(y(t), t) = y(t)*(y(t)-1)*doth; ode3 := diff(u(t), t) = sqrt(3/2)*u(t)*(1+u(t))*q;

>DEplot3d([ode1, ode2, ode3], [x(t), y(t), u(t)], t = -2 .. 2, x = 0 .. 1, y = 0 .. 1, u = -1 .. 0, [[x(0) = .9, y(0) = .25, u(0) = -.95], [x(0) = .9, y(0) = .25, u(0) = -.5], [x(0) = .85, y(0) = .2, u(0) = -.15], [x(0) = .25, y(0) = .5, u(0) = -.5], [x(0) = .7, y(0) = .5, u(0) = -.6]], linecolor = [red, green, black, navy, maroon], thickness = 2, axes = boxed, labels = [x(t), y(t), u(t)], arrows = medium, stepsize = 0.1e-1, orientation = [30, 65]);

--------------------------

and the next error appears

Error, (in DEtools/DEplot/direction3d) unable to store 'HFloat(HFloat(undefined))+HFloat(HFloat(undefined))*I' when datatype=float[8]

 

I have no idea what to do, and searching for solutions I have only found things that I dont understand.

 

Thank you very much in advance

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