# fluidsim.base.state¶

## State of the variables (fluidsim.base.state)¶

Provides:

class fluidsim.base.state.StateBase(sim, oper=None)[source]

Bases: object

Parameters
sim
operOptional[operators]
static _complete_info_solver(info_solver)[source]

Complete the ParamContainer info_solver.

This is a static method!

compute(key)[source]

Compute a not stored variable from the stored variables

clear_computed()[source]

Clear the stored computed variables.

has_vars(*keys)[source]

Checks if all of the keys are present in the union of keys_state_phys and keys_computable.

Parameters
keys: str, str …

Strings indicating state variable names.

Returns
bool

Examples

>>> sim.state.has_vars('ux', 'uy')
>>> sim.state.has_vars('ux')
>>> sim.state.has_vars('ux', 'vx', strict=False)


Todo

strict=True can be a Python 3 compatible keywords-only argument with the function like:

   def has_vars(self, *keys, strict=True):
...
if strict:
return keys.issubset(keys_state)
else:
return len(keys.intersection(keys_state)) > 0

When True, checks if all keys form a subset of state keys. When
False, checks if the intersection of the keys and the state keys
has atleast one member.

get_var(key)[source]

Get a physical variable (from the storage array or computed).

This is one of the main method of the state classes.

It tries to return the array corresponding to a physical variable. If it is stored in the main storage array of the state class, it is directly returned. Otherwise, we try to compute the quantity with the method compute().

It should not be necessary to redefine this method in child class.

can_this_key_be_obtained(key)[source]

To check whether a variable can be obtained.

Deprecated since version 0.2.0: Use has_vars method instead.

init_statephys_from(**kwargs)[source]

Initialize state_phys from arrays.

Parameters
**kwargs{key: array, …}

keys and arrays used for the initialization. The other keys are set to zero.

Examples

kwargs = {'a': Fa}
init_statespect_from(**kwargs)

init_statespect_from(ux=ux, uy=uy, eta=eta)

class fluidsim.base.state.StatePseudoSpectral(sim, oper=None)[source]

This is the general class for the pseudo-spectral solvers.

Parameters
sim
operOptional[operators]
static _complete_info_solver(info_solver)[source]

Complete the ParamContainer info_solver.

This is a static method!

has_vars(*keys)[source]

Checks if all of the keys are present in the union of keys_state_phys, keys_computable, and keys_state_spect.

Parameters
keys: str, str …

Strings indicating state variable names.

Returns
bool

Examples

>>> sim.state.has_vars('ux', 'uy', 'ux_fft')
>>> sim.state.has_vars('rot')

get_var(key)[source]

Get a variable (from the storage arrays or computed).

This is one of the main method of the state classes.

It tries to return the array corresponding to a physical variable. If it is stored in the main storage arrays (state_phys and state_spec) of the state class, it is directly returned. Otherwise, we try to compute the quantity with the method compute().

It should not be necessary to redefine this method in child class.

statespect_from_statephys()[source]

Compute the spectral variables from the physical variables.

When you implement a new solver, check that this method does the job!

statephys_from_statespect()[source]

Compute the physical variables from the spectral variables.

When you implement a new solver, check that this method does the job!

return_statephys_from_statespect(state_spect=None)[source]

Return the physical variables computed from the spectral variables.

can_this_key_be_obtained(key)[source]

To check whether a variable can be obtained.

Deprecated since version 0.2.0: Use has_vars method instead.

init_statespect_from(**kwargs)[source]

Initialize state_spect from arrays.

Parameters
**kwargs{key: array, …}

keys and arrays used for the initialization. The other keys are set to zero.

Examples

kwargs = {'a_fft': Fa_fft}
init_statespect_from(**kwargs)

ux_fft, uy_fft, eta_fft = oper.uxuyetafft_from_qfft(q_fft)
init_statespect_from(ux_fft=ux_fft, uy_fft=uy_fft, eta_fft=eta_fft)


Classes

 StateBase(sim[, oper]) Contains the state variables and handles the access to fields. StatePseudoSpectral(sim[, oper]) Contains the state variables and handles the access to fields.