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Merge pull request #180 from dyzheng/v2.2.3
Feature: added optional value "-1" for variable "symmetry" for no time-reversal symmetry
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docs/input-main.md

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#### symmetry
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- **Type**: Integer
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- **Description**: takes value 0 and 1, if set to 1, symmetry analysis will be performed to determine the type of Bravais lattice and associated symmetry operations.
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- **Description**: takes value 1, 0 and -1.
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- if set to 1, symmetry analysis will be performed to determine the type of Bravais lattice and associated symmetry operations. (point groups only)
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- if set to 0, only time reversal symmetry would be considered in symmetry operations, which implied k point and -k point would be treated as one double weight k point.
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- if set to -1, any symmetry will not be considered.
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- **Default**: 0
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#### kpar

examples/performance/P000_si16_pw/INPUT

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#Parameters (5.Mixing)
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mixing_type pulay
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mixing_beta 0.3
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ks_solver dav
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totalforceref 0.004764
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totaltimeref +25.75123
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examples/performance/P003_si128_pw/INPUT

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#Parameters (5.Mixing)
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mixing_type pulay
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mixing_beta 0.3
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ks_solver dav
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totalforceref 0.062868
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totaltimeref +9719.06052
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