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DuyDuc

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8 years, 308 days
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These are questions asked by DuyDuc

how can found points on boundary line of...

DuyDuc 27 Maple 2015
matrix surface
June 27 2017
0 1

dear all,

I have a problem when I try to find points on boundary of the surface.

the surface ploted from a matrix as follow:

 

please help me to generate a bondary curve of this surface.

Thanks

 

 

 

How can plot3d a sub-surface from surfac...

DuyDuc 27 Maple 2015
syntax plot3d surface
June 19 2017
2 2

Hi, everybody.

I have a problem when I try to plot3d a sub-surface from a surface as follows:


 

> 

S := proc (u, v) options operator, arrow; Matrix([[40*u], [80*v], [10*u^2*v+20*u*v+15]]) end proc;

proc (u, v) options operator, arrow; Matrix([[40*u], [80*v], [10*u^2*v+20*u*v+15]]) end proc

 (1)
> 

S(u, v)

Matrix(3, 1, {(1, 1) = 40*u, (2, 1) = 80*v, (3, 1) = 10*u^2*v+20*u*v+15})

 (2)
> 

 

> 

p:= proc(u,v) if u<v then S(u,v) else S(u,v)+10 end if end proc:
> 

h:= proc(u) 2*u  end proc:
> 

plot3d(p, 0 .. 1, 0 .. h)

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

  

 
> 

``


 

Download sub-surface.mw

sub-surface.mw

 

Please help me!

 

Thanks and have a nice day.

 

 

how to solve a system of trigonometric e...

DuyDuc 27 Maple 2015
June 09 2017
2 3

Hi everybody,

I'm kind of new to Maple and i'm trying to solve a system of trigonometric equations inequality as follow:

f:= {((2*a*sin(S)*cos(S)^(2)))/(1-sin(S)^(3))<1,90> S>-90,a>1};

solve(f,{a,S});
Error, (in PiecewiseTools:-Convert) unable to convert
 

How can I solve the system?

Thanks a lot.

how to creat a matrix from a many array...

DuyDuc 27 Maple 2015
array matrix loop
September 19 2016
5 3

Dear Pros, I'm a biginer so I have a question about my program.

I have a lot of arrays which are result from 2 while loop. Now, I want creat a matrix from them but i can't. So, could you help me to do it.

For detail: 

V[1]:=[ 1 2 3]

V[2]:=[2 3 4]

V[3]:=[3 4 5]

V[4]:=[2 6 7]

V[5]:=[7 8 9]

...

V[n]

with type of V[i] is a array.

I searched and found a solution by manual to create a matrix as follow:

V_matrix:=<V[1],V[2],V[3]>

but in this case i can't but manual with n=100

please help me to have a Matrix.

Thank a lots.

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