Singular Manual: bigintmat type cast

  | ### 4.3.3 bigintmat type cast `Syntax:` `bigintmat (` expression `)` `Type:` bigintmat `Purpose:` Converts expression to a bigintmat, where expression must be of type intmat, bigintvec, or bigintmat.The size (resp. dimension) of the created bigintmat equals the size (resp. dimension) of the expression. `Example:`
        intmat im[2][1]=2, 3;
        bigintmat(im);
      ==> 2,
      ==> 3
        bigintmat(_);
      ==> 2,
      ==> 3
        bigintmat(intmat(intvec(1,2,3,4), 2, 2)); //casts at first to intmat, then to bigintmat
      ==> 1,2,
      ==> 3,4
See Type conversion and casting; bigintmat; intmat type cast.

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