Return expression as FACTORS expression.
(obj)
| 1072 | |
| 1073 | |
| 1074 | def as_factors(obj): |
| 1075 | """Return expression as FACTORS expression. |
| 1076 | """ |
| 1077 | if isinstance(obj, Expr): |
| 1078 | obj = normalize(obj) |
| 1079 | if obj.op is Op.FACTORS: |
| 1080 | return obj |
| 1081 | if obj.op is Op.TERMS: |
| 1082 | if len(obj.data) == 1: |
| 1083 | (term, coeff), = obj.data.items() |
| 1084 | if coeff == 1: |
| 1085 | return Expr(Op.FACTORS, {term: 1}) |
| 1086 | return Expr(Op.FACTORS, {term: 1, Expr.number(coeff): 1}) |
| 1087 | if ((obj.op is Op.APPLY |
| 1088 | and obj.data[0] is ArithOp.DIV |
| 1089 | and not obj.data[2])): |
| 1090 | return Expr(Op.FACTORS, {obj.data[1][0]: 1, obj.data[1][1]: -1}) |
| 1091 | return Expr(Op.FACTORS, {obj: 1}) |
| 1092 | raise OpError(f'cannot convert {type(obj)} to terms Expr') |
| 1093 | |
| 1094 | |
| 1095 | def as_term_coeff(obj): |