## 25 Reputation

0 years, 140 days

## @tomleslie  @Kitonum Thank you. Wh...

@tomleslie
@Kitonum
Thank you.

What  about when we have symbpmic coefficients ?
In the case of " alpha*x[1]^3+beta*x[1]*x[2]^2 " for example, Maple consider that terms of degree 4 instead of degree 3.
Do you have some suggestions please ?

## @Kitonum  That's great! I learn...

@Kitonum  That's great!
Thank you.

## @Carl Love That's also working,...

@Carl Love That's also working, thanks a lot 🙏

## @Kitonum Thanks;;  the do...

@Kitonum
Thank you,  the double "seq" function  was the solution of my problem. Thanks again.

@mmcdara

Best regards,

## @tomleslie  Effectively, by using&...

@tomleslie

Effectively, by using unapply, my problem is solved.

best regards,

@acer Thank you.

## @Kitonum Thank you....

@Kitonum Thank you.

@nm Thank you.

@vv Thank you.

## @Carl Love Thank you....

@Carl Love Thank you.

## @vv Thank you, that’s what i ...

@vv Thank you, that’s what i want.

What you mean by " ^+ " in you expression please, because for me it returns "Error, invalid power".

## @vv Thank you. What i want in othe...

@vv Thank you.

What i want in other words is:

# If B is 8*8 (p*p) upper triangular matrix:
B:=Matrix(8, 8, [[1, -7, 0, 0, 0, 0, 0, 0], [-3, 21, 0, 0, 0, 0, 0, 0], [-1, 8, 1, -7, 0, 0, 0, 0], [2, -17, -3, 21, 0, 0, 0, 0], [1, -8, -1, 8, 1, -7, 0, 0], [-2, 9, 2, -17, -3, 21, 0, 0], [-1/3, 16/3, 1, -8, -1, 8, 1, -7], [4/3, -3, -2, 9, 2, -17, -3, 21]]);

# Then, instead of the two following Null vectors returned by NullSpace(B):
{
Vector[column](8, [0, 0, 0, 0, -7, -1, 1, 0]),
Vector[column](8, [0, 0, 0, 0, 49, 7, 0, 1])
}.

# I need, Null Vectors of B of the followinf form:
{
Vector[column](8, [0, 0, 0, 0, 0, 0, X]),
Vector[column](8, [0, 0, 0, 0, X, Y])
}.
# where,  X:=Vector[column](2, [x1, x2]),    and    Y=Vector[column](2, [y1, y2]).

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