## Bug #1026

### JanetBasis gives error indet index out of range

**Description**

The following input gives an error:

use QQ[x,y,z],lex; I := ideal(-x^2*y -x +z^3, -x^2*y +x^2*z +y^2, x^3 +y^3); JB := JanetBasis(I); --> ERROR: Indeterminate index out of range

It works fine if I do not specify `lex`

ordering.

### History

#### #1 Updated by John Abbott 12 months ago

There is a certain irony in finding this problem just 5 minutes after Mario left for good...

Is the implementation not valid for `lex`

ordering? If that is the case, then a better error message should be produced.

**NOTE** this input generators are ones which give large coeffs during the computation of a `lex`

Gbasis (even though the final result is not that horrible -- see issue #1025).