## 15 Reputation

9 years, 211 days

## Differential equation empty bracket outp...

Maple 16

The solution to the following differential equations results in empty brackets [] and I want to know their content

> Restart; ode := B*(x-1)^2*(diff(y(x), x, x))+C*(x-1)*(diff(y(x), x))+(A-x/(x-1))*y(x) = 0;

> dsolve(ode);

y(x) = _C1*(x-1)^((1/2)*(-C+B-I*sqrt(-B^2+(2*C+4*A-4)*B-C^2))/B)*hypergeom([], [(B+I*sqrt(-B^2+(2*C+4*A-4)*B-C^2))/B], 1/(B*(x-1)))+_C2*(x-1)^((1/2)*(-C+B+I*sqrt(-B^2+(2*C+4*A-4)*B-C^2))/B)*hypergeom([], [(B-I*sqrt(-B^2+(2*C+4*A-4)*B-C^2))/B], 1/(B*(x-1)))

## Taking the coeff of theta dot out maple ...

Here is my code where I get the problem of taking the coeff of theta dot . The output of matlab Cm shows the coeff in the output matlab ( Cmatrix , optimize) at t2727 I see coeff .Meaning when the loop ran coeff didn't execute.

> J[p1] := Matrix(3, 4, {(1, 1) = -sin(theta[1](t))*`&Delta;x`[1]-cos(theta[1](t))*`&Delta;z`[1], (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (2, 1) = cos(theta[1](t))*`&Delta;x`[1]-sin(theta[1...

## In Code Generation I keep getting this E...

I keep getting this error although the code is running fine in maple 14 , Help is greatly appreciated Thanks alot

> restart; with(LinearAlgebra);
> A[0] := Vector(3, {(1) = 0, (2) = 0, (3) = -g});
> type(a[0], Vector);
false
> omega[0] := Vector(3, {(1) = 0, (2) = 0, (3) = 0});

## A Gigantic Matrix how to convert it to...

Maple 13

I have a problem changing a maple matrix to a matlab code without getting the error

Error, (in PrintTarget) assigning to a long list, please use Arrays ( I don't know how to use arrays ) thanks Big in advance

Here is my code:

> J[p1] := Matrix(3, 4, {(1, 1) = -sin(theta[1](t))*`&Delta;x`[1]-cos(theta[1](t))*`&Delta;z`[1], (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (2, 1) = cos(theta[1](t))*`&Delta;x`[1]-sin(theta[1](t))*`&Delta;z`[1], (2, 2...

## differentiation with respect to time...

Maple 14

I need to differentiate a postion vector with respect to time and extract the theta dots in the following http://img543.imageshack.us/img543/3079/positionvector.jpg

Many Thanks

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