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J4James

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12 years, 119 days
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These are answers submitted by J4James

re solve...

J4James 355
October 03 2012
0 1 
restart:
with( RealDomain ):
#assume( x>0, y>0, x < y);
solve({x/y = (1/128)*y, (1/16)*x = 16/y},{x,y});
{x = 8, y = 32}

Re: DEplot...

J4James 355
September 30 2012
0 0

 

``

> 

restart:
> 

with(DEtools):
> 

ode := diff(y(x),x) =2*y(x)*(y(x)-4);

diff(y(x), x) = 2*y(x)*(y(x)-4)

 (1)
> 

DEplot(ode,y(x),x=-1..1,y=-2..7.40,arrows=medium,linecolor=black);

 

 

Download Deplot.mw

A possible way (pointplot)...

J4James 355
September 28 2012
0 0

 

``

> 

restart:with(plots):
> 

p:=[[0.7,0.3000],[1,0.2000208010],[1.3,0.010]];

[[.7, .3000], [1, .2000208010], [1.3, 0.10e-1]]

 (1)
> 

display(pointplot(p,color=[red]),pointplot(p,connect=true),labels = ["K","(newton@@5)(.2)"]);
> 

 

 

 

 

Download CEVplot.mw

absolute error tolerance...

J4James 355
September 27 2012
1 1

 

de1 := dsolve(d1, numeric,method = bvp,abserr=1*10^(-0));

 

abserr.mw

e should be exp(1)...

J4James 355
September 15 2012
0 1

f(x) := -(2*(exp(1)-1))*exp(-3*x)/exp(-3)+(3*exp(1)-2)*exp(-3*x)*x/exp(-3);

plot(f(x),x=1..10);

 

syntax...

J4James 355
September 11 2012
0 1 
restart:
ode := diff(f(x), x$3)-(diff(f(x), x$2))+2*(diff(f(x), x$1));
ics:=D(f)(0)=0,f(0)=1,(D@D)(f)(0)=0;
dsolve({ode,ics});
                         f(x) = 1

shooting method but no dual solution...

J4James 355
September 04 2012
0 0

Have a look.

Thanks

mprimesshootingmetho.mws

this is what you are looking for???...

J4James 355
August 30 2012
0 0

 

heat_eqn_plot.mws

 

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