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documentation:ref:collect [2015/11/20 20:30] poslavskysv [Examples] |
documentation:ref:collect [2015/11/20 20:32] poslavskysv [Description] |
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| ====Description==== | ====Description==== | ||
| - | * ''Collect[var1, var2, ..., [transformations]]'' collects together terms involving the same powers of specified vars and applies specified transformations to the expression that forms the coefficient of each term obtained. | + | * ''Collect[var1, var2]'' collects together terms involving the same powers of specified vars. |
| + | * ''Collect[var1, var2, ..., transformations]'' or ''%%Collect[var1, var2, ..., [Simplifications: transformations]]%%'' additionally applies specified transformations to the expression that forms the coefficient of each term obtained. | ||
| * In the case of tensorial vars, ''Collect'' will insert [[documentation:ref:Kronecker delta|Kronecker deltas]] or [[documentation:ref:metric tensor|metric tensors]] in order to "uncontract" indices and factor out tensorial parts. | * In the case of tensorial vars, ''Collect'' will insert [[documentation:ref:Kronecker delta|Kronecker deltas]] or [[documentation:ref:metric tensor|metric tensors]] in order to "uncontract" indices and factor out tensorial parts. | ||
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| * In the case of scalar vars, the behaviour of ''Collect'' is similar to other CASs. | * In the case of scalar vars, the behaviour of ''Collect'' is similar to other CASs. | ||
| - | * To prevent expand of symbolic terms when collecting tensors one can use option ''%%Collect[[vars, [ExpandSymbolic: true]]%%'' | + | * To prevent expand of symbolic terms when collecting tensors one can use option ''%%Collect[[var1, var2, ..., [ExpandSymbolic: false]]%%'' |
| ====Examples==== | ====Examples==== | ||