@acer 

hello Acer,

i tried but i get as an output A, i think maybe my problem is that the code is not written correctly. I would appreciate your insight.

thank you

@Carl Love 

hello Carl,

i am just doing some random exercises now, and it is helping me understand the logic and structure..

i am trying to write a code to display an array of elements, but i dont get a result when i type print (A), can you please guide me. 

Thank you

@Carl Love 

Hello Carl Love,

Thank you for your respond.
My class has covered topics such as Data Structure, control flow.. and i really want to test myself that i understand the topics. i tried coming up with some questions, but i would like to have some more practice. I tried looking up sample questions for maple, but i wasnt successful. I guess best thing would be to just understand definitions and attemp writign some basic codes. Any suggestions would be appreciate it.

Thank you 

@Rouben Rostamian  

now its my turn to respond to your comment...first ...you need to see a  psychiatrist and seocnd if you are not able to answer  questions that are posted and guide people in the right direction... then you must keep silent...and again go and see a psychiatrist..kosben kosenanatamian

@Kitonum 

hello,

now that I made the changes, for the last part i get an error message saying 

Error, ( in plots:-display ) expecting plot strcutire but recieved: plot 1

thank you 

@Kitonum 

hello,

thank you very much for your reply.

i am using maple 18 

here is my code: maple either ouputs an  error message or output  the word plot in blue ..and  same as for display 

y:=x->sin(x):

a:= -1:

b:=6:

plot1:=plot(sin(x), x=-1..6,color=red,title="graph of sin(x)"):        ( error, missing operation) or (plot)

plot2:=plot(sin(x),x=1..5,filled=[true,color=blue]):                            ( error, missing operation) or (plot)

display(plot1,plot2,view=[-1..6,-1..1],title="graph of sin(x)");

thanks again for your help.. 

> 

> 

@tomleslie 

hope your keyborad issue  gets resolved.

Im still  trying to make the code work..keeping my fingers crossed x..

thank you for all your help.

@Carl Love 

hello Carl,

thank you, I will make the correction. Hopefully it will work.

If possible, can you please just briefly explain, why my code for plotting  is not working?

Thanks again For your help.

@tomleslie 

hello Tom,

the reasons I am typing the code is because it's not working when I run the code..I tried to open the code on maple 18 and run it, but for some reason it keeps giving me an error message..

and as for the plot it says that the range -2pi to 0 is invalid.

thank you 

@tomleslie 

Hello Tomleslie,

so sorry to bother you again.

I am using maple 18 and i tried the code again, but unfortuntately it does not seem to work.

here is what i am putting in exactly...

g:=(x,y)--> evalf(sin(sqrt(x^2+y^2)+1):

     a:= -2*pi:

     b:=2*pi:

     c:=-2*pi:

      d:=2*pi:

      N:=15:

      X:=Array(0..N):

      y:=Array(0..N):

      z:=Array(0..N,0..N):

      s:=0:

     X[0]:=a:

     Y[0]:=c:

     Z[0,0]:=g(X[0],Y[0]):

      s:=0:

      dX:=(b-a)/N:

      dY:=(d-c)/N:

     for i from 1 to N do

     X[i]:=X[i-1]+dX:

     for j to N do

     Y[j]:=Y[j-1]+dY

     Z[i,j]:=g(X[i],Y[j]):

      s:= s+ z[i,j] *dx*dY:

       end do:

       end do;

Also for the displaying the curve and the parallelepiped, i am not able to also get graph:

here is what i put in exactly.

p1:= plot3d(g, -2*Pi..2*Pi, -2*Pi..2*Pi, color=blue, transparency=0.5):

p2:=Statistics[ScatterPlot3D](Array([seq(seq([a+i*dX, c+j*dY, Zi,j],i=0..N), j=0..N)]), lowess,fitorder=2,rule=3, color=red):

plots[display]([p1,p2]); t2:=time() -t1.

thank you so much for your help and guidance..

@acer 

hello, 

i am retyping the code again. when i cut and paste from the maple worksheet and that is the reason why it is not copying the syntax correctly.

I even tried the revised version of my code that was send to me by tomleslie but i get the same error message as what i got ( Error, unterminated loop).

Thannk you for your help.

    g:=(x,y)--> evalf(sin(sqrt(x^2+y^2)+1):

     a:= -2*pi:

     b:=2*pi:

     c:=-2*pi:

      d:=2*pi:

      N:=15:

      X:=Array(0..N):

      y:=Array(0..N):

      z:=Array(0..N,0..N):

      s:=0:

     X[0]:=a:

     Y[0]:=c:

     Z[0,0]:=g(X[0],Y[0]):

      s:=0:

      dX:=(b-a)/N:

      dY:=(d-c)/N:

     for i from 1 to N do

     Y[j]:=Y[j-1]+dY

     Z[i,j]:=g(X[i],Y[j]):

      s:= s+ z[i,j] *dx*dY:

       end do;

@tomleslie 

hello,

thank you for your help.

i tried the revised code, but it gave me the same message as before (error, unterminated loop)...

@Carl Love 

hello Carl Love,

thank  you very much for your quick respond and for your valuable guidance.

@Kitonum 

thank you so much for making the modifications, for my code to make more sense..

Thank you and thank you :)

@Rouben Rostamian  

Thank you for your explanation.

I will try to understand the reasoning behind it and apply it to my practice question.