Hi, I'm new to Maple and I'm trying to create a phaseportrait for the equation:

dy/dx = x²-y² 

when x = -3..3 and y = -3..3

If anyone can help me that would be great.

Thanks.

Above in the figure, the trapezoid method. How to fix the error?

And how to solve this interval using the method of rectangles?

Dear all

When requesting Maple to solve, for example, the 2D Laplace equation the default solution is 

U(x, y) = _F1(y-I*x)+_F2(y+I*x)

How can I ask Maple to provide a solution in real variables? I've tried  "assuming U(x,y) real", but the result is the same. 

Thank you very much for your help.

I want to use Burr distribution and hence I am creating custom probability distribution. The pdf of Burr is not piecewise. It gives error.

burrpdf := alpha*k*((x-gamma)/beta)^(alpha-1)/beta(1+((x-gamma)/beta)^alpha)^(k+1)

burr_distribution := Statistics[Distribution](PDF = (alpha > 0, beta > 0, gamma > 0, k > 0), burrpdf)

Error, (in Statistics:-Distribution) invalid input: too many and/or wrong type of arguments passed to NewDistribution;

how can i plot this plot in maple

Dear all

How compute the area ( closed area)  between the curves x=2-y^2,  y=x and y=-1 using simple or double integral.

Please, see the following figure.

Which  appropriate integral in Maple can be formulated to compute the area.

Many thanks for your help.

Hello everyone ,I have an easy question:

x,y:=1,2;

x+y=3;

how to display 1+2=3 rather than 3+3?Are there some suggestions to offer?

Thanks a lot~

Getting error as invalid product/quotient. Someone help me to correct this error.

Matrix(2,1,[A[1],B[1]]):=MatrixInverse([Q[1]])*([Q[2]] )*..* MatrixInverse([Q[j]])*([Q[j+1]])* ..*MatrixInverse([Q[2 n-2]])*([Q[2 n-1]])Matrix(2,1,[A[N],B[N]]);

how to plot this equation?

4*del/(4*del+(1+del)^2*sinh(KL)^2)

Hi,
First of all I am not an expert in using Maple. 
When I execute the following code, it runs without an error:
----------------
restart;  

with(plots):

g:=(x,y)->sin(((1+x^2+y^2))*(Pi/2)) ;                                                                            

 q:=(n,k,x)->binomial(n,k)*(((1+x)/2)^k)*((1-x)/2)^(n-k) ;                                                            

  K:=(n,m,x,y)->((1+n)/2)*((1+m)/2)*sum(q(n,k,x)*sum(q(m,j,y)*int(int(g(t,u),u=2*(j/(m+1))-1..2*((j+1)/(m+1))-1),t=2*(k/(n+1))-1..2*((k+1)/(n+1))-1),j=0..m),k=0..n);                                                                      

p1:=plot3d(g(x,y),x=-1..1,y=-1..1,color=blue):                                                                       p2:=plot3d(K(30,30,x,y),x=-1..1,y=-1..1,color=brown):                                                                    

display([p1,p2]);
---------
However, when I execute the following code,  I get the error message "to many levels of recursion"
---------
restart;                                                                                                                

with(plots):                                                                                                          

 g:=(x,y)->sin(Pi*(x+y))*(x^2+y^2);                                                                  

 q:=(n,k,l,x,y)->binomial(n,k)*binomial(n-k,l)*(((1+x)/2)^k)*(((1+y)/2)^l)*(1-((1+x)/2)-((1+y)/2))^(n-k-l) ;                                              K:=(n,x,y)->(((1+n)*(2+n))/4)*sum(sum(q(n,k,l,x,y)*int(int(q(n,k,l,t,u)*g(t,u),u=-1..-t),t=-1..1),l=0..n-k),k=0..n);  p1:=plot3d(g(x,y),x=-1..1,y=-1..-x,color=blue):                                                                      

 p2:=plot3d(K(1,x,y),x=-1..1,y=-1..-x,color=brown):                                                                  

p3:=plot3d(K(2,x,y),x=-1..1,y=-1..-x,color=yellow):                                                                

p4:=plot3d(K(5,x,y),x=-1..1,y=-1..-x,color=green):                                                                    

p5:=plot3d(K(10,x,y),x=-1..1,y=-1..-x,color=red):                                                              

   display([p1,p2,p3,p4,p5]);
--------
Could you please help me with this problem. Thanks in advance.

Dear User!

Hoped you all are fine with everything. I am facing to determinte the integration of the following for n = 0 and for n>=1.

int(2*x^i*(x+n)^m*sqrt(-x^2+x), x = 0 .. 1)

I am unable to compute integral, it displays the function itself.

burrpdf := alpha*k*((x-gamma)/beta)^(alpha-1)/beta(1+((x-gamma)/beta)^alpha)^(k+1)

mean_burr_temp := simplify(x*burrpdf)

int(mean_burr_temp, x = gamma .. t)

Hello Everybody!
Please help me to find a way to write the Taylor's series of some function in factiorial or Gamma notation.
Please see the attached file and suggest me something.
taylor_series_general.mw

I've been using Maple 2018 only a few days now, was mostly using Maple 2016 and never had any issues with returning an output (at least one that wasnt my fault), but with 2018 I've seen a few times where a simple task would return an output of "__SELECTION" and then my input. No idea what this is or why its happening and all I really need to know is how to prevent it from happening. If its something with my preferences or settings that needs to be addressed, thats fine, but otherwise this is getting to be a real pain. See attached 

input -->

restart; with(plots);
H := 11;
B := x; W := x;
t__E := (13100*(B*B)*H*(.23-.10)*1.2)/(1500*alpha);
A__t := 2*B*W+2*H*(B+W);
OF := alpha/A__t;
for alpha from .1 by .1 to 2 do XX[alpha] := solve({0 < x, OF < 0.6951871658e-2, t__E < 200}, x) end do

result-->

         XX[0.1] := {0.3222041888 < x, x < 1.155224359}
         XX[0.2] := {0.6354894776 < x, x < 1.633733956}
         XX[0.3] := {0.9405579047 < x, x < 2.000907284}
         XX[0.4] := {1.238023973 < x, x < 2.310448718}
         XX[0.5] := {1.528429210 < x, x < 2.583160196}
         XX[0.6] := {1.812253750 < x, x < 2.829710218}
         XX[0.7] := {2.089925662 < x, x < 3.056436363}
         XX[0.8] := {2.361828525 < x, x < 3.267467912}
         XX[0.9] := {2.628307644 < x, x < 3.465673077}
         XX[1.0] := {2.889675191 < x, x < 3.653140182}
         XX[1.1] := {3.146214498 < x, x < 3.831445747}
         XX[1.2] := {3.398183646 < x, x < 4.001814567}
         XX[1.3] := {3.645818516 < x, x < 4.165220660}
         XX[1.4] := {3.889335368 < x, x < 4.322453755}
         XX[1.5] := {4.128933055 < x, x < 4.474164703}
         XX[1.6] := {4.364794925 < x, x < 4.620897435}
         XX[1.7] := {4.597090458 < x, x < 4.763112053}
         XX[1.8] := {4.825976698 < x, x < 4.901201868}
 

question -->

anyone knows a simple way how I can plot the points of the lower boundaries and upper boundaries of x as two line graphs (without copy pasting all the values into separate lists and then using the listplot command)?

thanks