## 240 Reputation

7 years, 212 days

## Why I cant derivate with respet to time ...

What is incorrect I am getting the error:

 >
 >
 >
 >
 (1)
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## One simple question about matrix indexin...

You know in maple's linear algebra the Xij is true for i,j>0, X00 is meaningless.

Is it possible in Maple when we call X00 it returns the X11 element of the matrix, instead of

Error, Matrix index out of range

I try to do this by writing a procedure as bellow:

X := proc (i, j)

X[i+1, j+1]

end proc

but it does not work.

restart;
with(LinearAlgebra);
X := proc (i, j)

X[i+1, j+1]:

end proc;

X := Matrix(2, 2, [[m[1, 1], m[1, 2]], [m[2, 1], m[2, 2]]]);
X[0, 0];
Error, Matrix index out of range

Any suggestion?

## How to compute inverse of square matrix?...

How to compute inverse of a square matrix in maple?

Like below matrix:

Matrix(6, 6, [[1/EE__1, -nu__21/EE__2, -nu__31/EE__3, 0, 0, 0.], [-nu__12/EE__1, `#mn("1")`/EE__2, -nu__32/EE__3, 0, 0, 0.], [-nu__13/EE__1, -nu__23/EE__2, `#mn("1")`/EE__3, 0, 0, 0], [0, 0, 0, 1/GG__23, 0., 0], [0, 0, 0, 0., 1/GG__13, 0], [0., 0., 0, 0, 0, 1/GG__12]])

Maple help say there is a mode n number, but what actually is it?

## How to select imaginary part of a soluti...

How to select imaginary part of the followig solution in Maple?

restart;
y := x^2+x+7;

A := solve({y}, {x});
/      1   3    (1/2)\    /      1   3    (1/2)\
{ x = - - + - I 3      }, { x = - - - - I 3      }
\      2   2         /    \      2   2         /
Im(A);
Error, invalid input: Im expects 1 argument, but received 2

## What is the best way to solve the couple...

Maple

What is the best way to solve the coupled differential equation sets (like below) in Maple?

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