Multiplication of Linear Expressions

Multiplication of linear expressions.

Description

Script for the multiplication of linear expressions without coefficient constants. This script returns a polynomial of given expressions.
The number of expressions are not restricted and constant may be real or integer.

Example

Compute the (x-2)(x+4)(x-5)...
write in following format. here x is a Row Matrix

>> x=[-2,4,5]
>> mul_l_exp(x)

• MATLAB release: MATLAB 5.3.1 (R11.1)

[Jos j]

% This will do something very similar, but more efficient:
x = [-2, 4 5] ;
x = [ones(length(x),1) x(:)] ;
i = 1 ;
p = x(i,:) ;
while (i < size(x,1)),
  i = i + 1 ;
  p = conv(p,x(i,:)) ;
end
% p contains the coefficients
pstr = poly2str(p,'X') ;

furthermore, it can be easily changed for multiplying higher order polynomials.

[Nadeem Malik]

good work. there is a need of multiple product methods

[Ali Amir]

oooh, u solve my little problem