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NumCompts

the number of components

Syntax

NumCompts(X: MODULEELEM|MODULE): INT

Description

If X is a MODULEELEM , it returns the number of components of X . If X is a MODULE , it returns the rank of the free module in which X is defined.

This function used to be called NumComps in CoCoA-4.

Example

/**/ Use R ::= QQ[x,y]; /**/ R2 := NewFreeModule(R, 3); /**/ M := SubmoduleRows(R2, matrix(R, mat([[x,0,y], [x^2+y^2,x^2,3]]))); /**/ NumCompts(M); 3 /**/ NumCompts(gens(M)[1]); 3

See Also

• len