Example of use of the math::linearalgebra package to solve a question posed on [L1 ]
This text copied directly from the above reference:
Example: A man buys 3 fish and 2 chips for £2.80 A woman buys 1 fish and 4 chips for £2.60 How much are the fish and how much are the chips?
Use the linear algebra package thus:
package require math::linearalgebra set mt [math::linearalgebra::mkMatrix 2 2 0.0] ;# there are 2 transactions buying 2 items set vc [math::linearalgebra::mkVector 2 0.] ;# 2 transactions math::linearalgebra::setelem mt 0 0 3 ;# 3 fish in transaction 1... math::linearalgebra::setelem mt 0 1 2 ;# 2 chips math::linearalgebra::setelem mt 1 0 1 ;# 1 fish in transaction 2 math::linearalgebra::setelem mt 1 1 4 ;# 4 chips (this is a rather unbalanced meal) math::linearalgebra::setelem vc 0 2.8 ;# cost of transaction 1 math::linearalgebra::setelem vc 1 2.6 ;# and transaction 2 math::linearalgebra::solveGauss $mt $vc ;# calcualte the result
And the result:
0.6 0.500000000001
or the fish cost 0.60 (rather cheap) and the chips 0.50. As given in the reference above.