The conjugate_gradient command uses the conjugate gradient algorithm to solve a linear system of equations.
We can solve the system {
| 2x+y=1 | 
| x+5y=0 | 
by entering one of the following commandlines.
| conjugate_gradient([[2,1],[1,5]],[1,0]) | 
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| conjugate_gradient([[2,1],[1,5]],[1,0],[0.55,-0.11],1e-2) | 
| 
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| conjugate_gradient([[2,1],[1,5]],[1,0],[0.55,-0.11],1e-10) | 
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