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4.12.2 matrix expressions
A matrix expression is:
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an identifier of type matrix
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a function returning matrix
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matrix expressions combined by the arithmetic operations
+ , - or *
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a type cast to matrix (see matrix type cast)
Example:
| ring r=0,(x,y),dp;
poly f= x3y2 + 2x2y2 +2;
matrix H = jacob(jacob(f)); // the Hessian of f
matrix mc = coef(f,y);
print(mc);
==> y2, 1,
==> x3+2x2,2
module MD = [x+y,1,x],[x+y,0,y];
matrix M = MD;
print(M);
==> x+y,x+y,
==> 1, 0,
==> x, y
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