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gkokovidis

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20 years, 105 days
Draeger Medical Systems, Inc.
Contact gkokovidis

 

 

Regards,
Georgios Kokovidis
Dräger Medical

MaplePrimes Activity


These are replies submitted by gkokovidis

One more way, in one line...

gkokovidis 2355
November 18 2013
0 4

plot((eval ((6), {n=10, m=1}),k=0.1..0.2));

 

Regards,

Georgios Kokovidis

Dräger Medical

Side by side...

gkokovidis 2355
November 03 2013
0 0

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

Plotting Two curves...

gkokovidis 2355
November 03 2013
0 0

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

Firefox...

gkokovidis 2355
October 25 2013

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

Sequence of real numbers...

gkokovidis 2355
October 08 2013

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

dsolve in education...

gkokovidis 2355
September 10 2013

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

Brute Force...

gkokovidis 2355
April 03 2013
0 0

 

``

> 

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

Brute Force...

gkokovidis 2355
April 03 2013


> 

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

filled=true...

gkokovidis 2355
October 07 2012
0 0

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

filled=true...

gkokovidis 2355
October 07 2012

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

Upload an example worksheet...

gkokovidis 2355
September 17 2012
0 0

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

Upload an example worksheet...

gkokovidis 2355
September 17 2012

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

Worksheet...

gkokovidis 2355
September 12 2012

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

HTML...

gkokovidis 2355
September 01 2012

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

inverse of a matrix...

gkokovidis 2355
July 08 2012
0 0

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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