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Maliha Saleem

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10 years, 54 days
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These are replies submitted by Maliha Saleem

Thank you....

Maliha Saleem 5
September 16 2015
0 0

thanks all for your help . i have learned alot.

maple file...

Maliha Saleem 5
September 16 2015
0 0

error.mw

> 

ge := diff(u(x, y), `$`(y, 2)) = -epsilon^2*(diff(u(x, y), `$`(x, 2)))

diff(diff(u(x, y), y), y) = -(diff(diff(u(x, y), x), x))

 (1)
> 

bc1 := u(x, y)+0

u(x, y)

 (2)
> 

bc2 := u(x, y)+0

u(x, y)

 (3)
> 

bc3 := u(x, y)+0

u(x, y)

 (4)
> 

bc4 := u(x, y)-1

u(x, y)-1

 (5)
> 

epsilon := 1

1

 (6)
> 

fd1 := (1/2)*(-u[m+2](zeta)-3*u[m](zeta)+4*u[m+1](zeta))/h

(1/2)*(-u[m+2](zeta)-3*u[m](zeta)+4*u[m+1](zeta))/h

 (7)
> 

bd1 := (u[m-2](zeta)+3*u[m](zeta)-4*u[m-1](zeta))/(2*h)

(1/2)*(u[m-2](zeta)+3*u[m](zeta)-4*u[m-1](zeta))/h

 (8)
> 

cd1 := (1/2)*(u[m+1](zeta)-u[m-1](zeta))/h

(1/2)*(u[m+1](zeta)-u[m-1](zeta))/h

 (9)
> 

cd2 := (u[m-1](zeta)-2*u[m](zeta)+u[m+1](zeta))/h^2

(u[m-1](zeta)-2*u[m](zeta)+u[m+1](zeta))/h^2

 (10)
> 

bc1 := subs(diff(u(x, y), x) = subs(m = 0, fd1), u(x, y) = u[0](zeta), x = 0, bc1)

u[0](zeta)

 (11)
> 

bc2 := subs(diff(u(x, y), x) = subs(m = N+1, bd1), u(x, y) = u[N+1](zeta), x = 1, bc2)

u[5](zeta)

 (12)
> 

N := 4

4

 (13)
> 

eq[0] := bc1

u[0](zeta)

 (14)
> 

eq[N+1] := bc2

u[5](zeta)

 (15)
> 

NULL
> 

for i to N do eq[N+1+i] := diff(u[N+1+i](zeta), zeta) = subs(diff(u(x, y), `$`(x, 2)) = subs(m = i, cd2), diff(u(x, y), x) = subs(m = i, cd1), u(x, y) = u[i](zeta), x = i*h, rhs(h^2*ge/epsilon^2)) end do

diff(u[6](zeta), zeta) = -u[0](zeta)+2*u[1](zeta)-u[2](zeta)

  

diff(u[7](zeta), zeta) = -u[1](zeta)+2*u[2](zeta)-u[3](zeta)

  

diff(u[8](zeta), zeta) = -u[2](zeta)+2*u[3](zeta)-u[4](zeta)

  

diff(u[9](zeta), zeta) = -u[3](zeta)+2*u[4](zeta)-u[5](zeta)

 (16)
> 

"u[0](zeta):=(solve(eq[0],u[0](zeta)));"

Error, unable to parse

":=(Zeta)->(solve(eq[0],u[0](Zeta)));"

  
> 

"u[N+1](zeta):=(solve(eq[N+1],u[N+1](zeta)));"

Error, unable to parse

":=(Zeta)->(solve(eq[N+1],u[N+1](Zeta)));"

  
> 

``
> 

NULL



Download error.mw

@Maliha Saleem 

maple file...

Maliha Saleem 5
September 16 2015
0 0

@tomleslie 

here i my file.

@Preben Alsholm  can you tell me yo...

Maliha Saleem 5
September 16 2015
0 0

@Preben Alsholm 

can you tell me your maple version plz..

still problem...

Maliha Saleem 5
September 16 2015
0 0

@Preben Alsholm 

i am exprencing the same problem in new sheet.

on pressing enter a new window opens of title

clerify expression.

parts of expressions are ambigous. please select one of the suggested meanings.

function defination or remember table assignment.

 

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