gkokovidis

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16 years, 145 days
Draeger Medical Systems, Inc.

 

 

Regards,
Georgios Kokovidis
Dräger Medical

MaplePrimes Activity


These are replies submitted by gkokovidis

restart:with(plots):A:=Array(1..2);
eq1:=0.199563349672261+0.01*x^1.13-0.018*x^1.13;
eq2:=.29-0.01*x^1.003-0.013*x^0.97966;
A[1]:=plot(eq1,x=0..10,color=green):
A[2]:=plot(eq2,x=0..10,color=blue):
display(A);

//Georgios

Here is one way.  You have to modify the coeffecients, because I didn't type them all in.  For more help, see ?display and ?plot

restart:


eq1:=0.199563349672261+0.01*x^1.13-0.018*x^1.13;
                                                       
eq2:=.29-0.01*x^1.003-0.013*x^0.97966;
            
plot({eq1,eq2},x=0..10);

Regards,

Georgios

Hello Carl.  I am using Firefox v24.0 to compose this message.  I do notice (my perspective only), that the Mapleprimes site is faster - i.e. the pages load quickly, compared to what I was accustomed to.  I haven't had any issues login in.

 

Regards,

Georgios Kokovidis

Dräger Medical

Here is one way, as described here

restart

with(gfun):

L := [3, 9, 18, 54, 63];

[3, 9, 18, 54, 63]

(1)

rec := listtorec(L, f(n));

[{(-n-3)*f(n+3)+(-5-4*n)*f(n+2)+(28+13*n)*f(n+1), f(0) = 3, f(1) = 9, f(2) = 18}, ogf]

(2)

F := rectoproc(rec[1], f(n), 'remember');

proc (n) option remember; table( [( 0 ) = 3, ( 1 ) = 9, ( 2 ) = 18 ] ) -(11*procname(-2+n)-7*procname(-1+n)-(13*procname(-2+n)-4*procname(-1+n))*n)/n end proc

(3)

seq(F(i), i = 0 .. 10);

3, 9, 18, 54, 63, 2097/5, -2424/5, 218664/35, -880578/35, 5412794/35, -141705492/175

(4)

``

Download listtorec.mw

Regards,

Georgios

Here is the same problem, shown with the "prime" notation.  This is under the help page for dsolve,

under the heading: "Maple dsolve in Education".

restart:with(DEtools):with(PDEtools,declare):

declare(y(x),prime=x); # Turn ON the enhanced DEdisplay feature

y(x)*`will now be displayed as`*y

`derivatives with respect to`*x*`of functions of one variable will now be displayed with '`

ode1 := diff(y(x),x,x)+4*y(x)=sin(2*x);

ode1 := `y''`+4*y = sin(2*x)

dsolve(ode1);

y = sin(2*x)*_C2+cos(2*x)*_C1-(1/4)*cos(2*x)*x

 

 

Download dsolve_primes.mw

Regards,

Georgios

 

``

restart:

answer:=Int(Int(Int(sqrt(x^2+y^2+1), z = -1 .. 2), y = -sqrt(-x^2+8) .. sqrt(-x^2+8)), x = 0 .. 2*sqrt(2))=evalf(Int(Int(Int(sqrt(x^2+y^2+1), z = -1 .. 2), y = -sqrt(-x^2+8) .. sqrt(-x^2+8)), x = 0 .. 2*sqrt(2)));

Int(Int(Int((x^2+y^2+1)^(1/2), z = -1 .. 2), y = -(-x^2+8)^(1/2) .. (-x^2+8)^(1/2)), x = 0 .. 2*2^(1/2)) = 81.68140897

(1)

identify(op(2, answer));

 

 

26*Pi

(2)

``

``


Download identify.mw


restart:

answer:=Int(Int(Int(sqrt(x^2+y^2+1), z = -1 .. 2), y = -sqrt(-x^2+8) .. sqrt(-x^2+8)), x = 0 .. 2*sqrt(2))=evalf(Int(Int(Int(sqrt(x^2+y^2+1), z = -1 .. 2), y = -sqrt(-x^2+8) .. sqrt(-x^2+8)), x = 0 .. 2*sqrt(2)));

answer := Int(Int(Int((x^2+y^2+1)^(1/2), z = -1 .. 2), y = -(-x^2+8)^(1/2) .. (-x^2+8)^(1/2)), x = 0 .. 2*2^(1/2)) = 81.68140899

identify(op(2,answer));

26*Pi

 

 


Download identify.mw

Yes.  Use the filled=true argument to plot, just like you did when you created and filled the square.

plot([[ p0, p1, p2, p3, p0 ]],thickness=3,scaling=constrained,axes=framed,filled=true);

 

Regards,

Georgios Kokovidis

Dräger Medical

Yes.  Use the filled=true argument to plot, just like you did when you created and filled the square.

plot([[ p0, p1, p2, p3, p0 ]],thickness=3,scaling=constrained,axes=framed,filled=true);

 

Regards,

Georgios Kokovidis

Dräger Medical

Can you upload an example worksheet where you are having the problem with "kernel lost". 

What happens when you run your problem with the recommendations made my acer and Doug Meade.  Do you see the same thing happen there, with "kernel lost" being reported?

 

Regards,

Georgios Kokovidis

Dräger Medical

Can you upload an example worksheet where you are having the problem with "kernel lost". 

What happens when you run your problem with the recommendations made my acer and Doug Meade.  Do you see the same thing happen there, with "kernel lost" being reported?

 

Regards,

Georgios Kokovidis

Dräger Medical

Could you upload a worksheet instead of an image.  That way we can see the whole thing, and not have to guess at what you typed.

 

Regards,

Georgios Kokovidis

Dräger Medical

I am seeing the same problem that you are.  The html version flashes for an instant, and then I see what you see.  I am using Firefox.  Internet Explorer behaves the same way as Firefox.  It looks like an issue with the site that needs to be fixed.

 

Regards,

Georgios Kokovidis

Dräger Medical

Your first Matrix was not singular.  When you ask, "Is it singular too?", what do you mean? 

The second Matrix is singular, because the determinant is 0.  Can you show your code, and the version of Maple that you are using to determine the inverse?

 

Regards,

Georgios Kokovidis

Dräger Medical

Your first Matrix was not singular.  When you ask, "Is it singular too?", what do you mean? 

The second Matrix is singular, because the determinant is 0.  Can you show your code, and the version of Maple that you are using to determine the inverse?

 

Regards,

Georgios Kokovidis

Dräger Medical

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