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Hi guys! Maple noob here.

I want to get an array of the sums of each and every row of a matrix which I imported from Excel. I can't manage to work my way around with LinearAlgebra-Add, Sum and eval. Maple always shows me the table and not the scalar I am looking for.

I'd also like to know how to tell Maple how to do something on a certain interval of cells of the matrix.

I hope I have been clear and you can help me out :D

Cheers from Italy!

Hi all,

I am trying to get the following matrix:

restart:
int00:=Matrix(3,3);
int00[2,2]:=a;
int00[2,3]:=b;
int00[3,2]:=c;
int00[3,3]:=d;
int00;
cols:=MTM:-sum(int00,1);
rows:=MTM:-sum(int00,2);
int00[1,1..3]:=-cols:
int00[1..3,1]:=-rows:
int00;

int00[1,1]:=a+b+c+d:
int00;
MTM:-sum(int00,1);
MTM:-sum(int00,2);

How do I get the sum of all elemnets in the 'original' matrix? Bascially, the int00[1,1] term in the toy example.

Hi all,

A := [[1,2],[3,4]];

A1:=convert(A, Matrix);

 

I am very happy with conversion between Matrices and Vectors.

However, I does not seem to be able to do this backwards to [row] or [column] Vectors???

Say how do I get back to A from A1???

 

I tried to use

convert(A1,Vector);

convert(A1,Vector[row]);

convert(A1,Vector[row],2);

 

And many others...

hey guys , my concern is about boundaries in random matrix or rtable. so, i can garantee that boundaries in  matrices are in 0 and 10, but i can´t impose a restriction  like the sum of row must be equal 10 for example.
help !! 

pop:=(10-0)*ArrayTools:-RandomArray(proc(A)
local i
if A::rtable[row] then 
seq(A(i),i=1..NumElems(A));
else
args
end if 
end proc(10,3))+0; 

Suppose I have a matrix M, with rational entries. I need to go row by row and scale each individually by the smallest possible integer such that the entries in each row are integer-valued - anyone have an easy way to do this? It's a large matrix.

 

I have data organized in a Matrix from which I want to select a sample based on a certain (simple) criterion, e.g. no cell in the first column to be negative.

I was quickly able to find a way to do it, inspired by a method Preben Alsholm used in a recent mapleprimes post.

But, I wondered, is that the most natural approach? So I quickly found another approach and compared them.

Any other suggestions welcome. Particularly methods that could...

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