@tomleslie 

My test.mw file.

Current worksheet:

Retrieve_test2.mw

test.mw

I tested on Windows 8.1 with and no administrator privileges on Maple 2018 and not working correctly.

@Rouben Rostamian  

@Amna Raja 

My verification test says:  V(x, t)  is not a solution for equation:  I*(diff(V(x, t), t, t))+diff(V(x, t), x, x)-I*sigma*V(x, t)*(conjugate(V(x, t))*(diff(V(x, t), x))-V(x, t)*(diff(conjugate(V(x, t)), x)));

RANDOM_ver2.mw

@alfarunner 

BVP := [4*(diff(u(x, t), t))-9*(diff(u(x, t), x, x))-5*u(x, t) = 0, u(0, t) = 0, u(6, t) = 0, u(x, 0) = sin((1/6)*Pi*x)^2];

sol := pdsolve(BVP);

It's not worked because solution in Maple 2017 have a imaginary terms if you expand.

value(eval(rhs(sol), infinity = 3));

Secound term is have imaginary unit.

In Maple 2018 is corrected.

Commands in Maple 2017.

plot3d(Re(value(eval(rhs(sol), infinity = 10))), x = 0 .. 6, t = 0 .. 4);

plot3d(Re(value(subs(infinity = 10, rhs(sol)))), x = 0 .. 6, t = 0 .. 4);

plot3d(Re(value(subs(infinity = 10, op(2, sol)))), x = 0 .. 6, t = 0 .. 4);

Information you can find in Help documentation.

Execute command:

?sets

@Amna Raja 

Yes,

Solution V := -2*exp(I*(sqrt(-b^2-r+2)*x+b*y+r*t))*sqrt(1/sigma)*sech(-t*(-2*sqrt(-b^2-r+2)-2*b)-x-y) is valid for the equation  I*(diff(V, t))+diff(V, x, x)+diff(V, y, y)+sigma*abs(V^2)*V = 0.I checked it by generating random numbers.In yours case simplify and pdetest fails.

Download RANDOM.mw

@Adam Ledger 

Code to find sum(5^n*floor(5^n/4), n= 1..N).

l := [seq(sum(5^n*floor((1/4)*5^n), n = 1 .. N), N = 0 .. 10)];

rec := gfun:-listtorec(l, u(N), [ogf]);

rsolve(op([1], rec), u(N));

@vv 

What a pity!!! 

Thanks.

@vv 

Thanks.

How to do it with evalf(Int(f,t=0..Pi/2,method=X)) ?

X is a  build in Maple method.

@Adam Ledger 

This is just a mistake. Ignore this.

Execute in Maple:

?Hfloat

@Numan W 

If I help you,  please give me vote up.

@dan 

If I help you,  please give me vote up.

People here generally like users to post code as Maple code instead of images, so they can copy-paste it.