## 142 Reputation

16 years, 207 days

## Making all coefficients of multivariate ...

Maple

Hello,

suppose I have a huge polynomial in several variables, say x, y and z, with some unknown coefficients:

(a*b+1)*x^3+(a+b+1)*x^2*y^2+(a-b^3)*x*y^2+a*y^10

Is there an efficient way to obtain all coefficients, when interpreting this as a polynomial in x and y?

(My goal is to make maple solve the equations in a and b  in order to let the polynomial be identically zero)

Many thanks!

## "Equal" function for matrices incorrectl...

Maple

Hello,

I have some strange problems with the function "Equal" in LinearAlgebra, which should allow me to compare matrices.

First of all, this works without any problems:

> restart; with(LinearAlgebra);
> A := Matrix(2, 2, [[0, 0], [0, 0]]);
> Equal(A^2, A);

Maple correctly returns "true" since here A is equal to its square.

But:

> restart; with(LinearAlgebra);
> A := Matrix([[a, 0], [0, 0]]);

## How to make a list of matrices?...

Maple

Hello,

I have a very basic question: how to make a list of matrices?

For instance, this doesn't work:

for i from 1 to 4 do
M[i]:=Matrix(2,2,[[1,i],[i,i^2]]);

od;

Many thanks!

## ImportMatrix does not work on files with...

Maple

Hello,

I am trying to force Maple to read big matrices from files, produced by other programs (GAP in my case).

The output looks like this after it's been saved in a *.txt file:

[ [ 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0,

## solving equations from equating linear c...

Hello,

recently I was helped on this forum when I asked how to work with exterior products:

http://www.mapleprimes.com/questions/137431-Efficient-Way-To-Work-Out-Exterior-Products

Now I would like to know how I can efficiently let Maple solve systems of equations between wedge products.

For instance, I would ask Maple to solve

 1 2 3 4 5 Page 1 of 5
﻿