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Physical quantities.
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Physical quantity: can be a unit of measure, a constant or a generic quantity.
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zQuantity.set_dimensionc C r) )Nr* r+ r, zLunit_system.set_quantity_scale_factor or {}.set_global_relative_scale_factorr r r- )r r/ r r0 r. r1 �set_quantity_scale_factor)r3 r r4 r. r& r& r' r U r5 zQuantity.set_scale_factorc C s |t j| < d S �N)r �_quantity_dimension_global)r3 r r& r& r' �set_global_dimension` s z Quantity.set_global_dimensionc C sL ddl m} t|�}|�dd� dd� �}t|�}||f|j| < ||j| < dS )zN
Setting a scale factor that is valid across all unit system.
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t | t�S r7 )r r ��xr& r& r' �<lambda>k s
z;Quantity.set_global_relative_scale_factor.<locals>.<lambda>c S � | j S r7 )r r: r& r& r' r< l s N)r0 r. r �replace� _quantity_scale_factors_global�,_quantity_dimensional_equivalence_map_global)r3 r �reference_quantityr. r& r& r' � set_global_relative_scale_factorc s �z)Quantity.set_global_relative_scale_factorc C r= r7 )r �r3 r& r& r' r r s z
Quantity.namec C � ddl m} |�� }|�| �S )Nr r- )r0 r. �get_default_unit_system�get_quantity_dimension�r3 r. r4 r& r& r' r v s
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Symbol representing the unit name.
Prepend the abbreviation with the prefix symbol if it is defines.
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Overall magnitude of the quantity as compared to the canonical units.
r r- )r0 r. rE �get_quantity_scale_factorrG r& r& r' r � s
zQuantity.scale_factorc C � dS �NTr& rC r& r& r' �_eval_is_positive� � zQuantity._eval_is_positivec C rI rJ r& rC r& r& r' �_eval_is_constant� rL zQuantity._eval_is_constantc C s | S r7 r& rC r& r& r' � _eval_Abs� rL zQuantity._eval_Absc C s t |t�r | |kr
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_eval_subs� s �zQuantity._eval_subsc C �4 t ddddd��� ddlm} |�|�}|�| �S )Nr* r+ z{get_dimensional_expr() is now associated with UnitSystem objects. The dimensional relations depend on the unit system used.z unit_system.get_dimensional_exprr r r- )r r r0 r. r1 �get_dimensional_expr��exprr4 r. r& r& r' rS � s �
z Quantity.get_dimensional_exprc C rR )zCReturn tuple with scale factor expression and dimension expression.r* r+ z3This method has been moved to the UnitSystem class.z)unit_system._collect_factor_and_dimensionr r r- )r r r0 r. r1 � _collect_factor_and_dimensionrT r& r& r' rV � s �
z&Quantity._collect_factor_and_dimensionc C s6 | j r| j S d�t| j�dkr| jd �S | jd �S )Nz \text{{{}}}� � r )r r/ �len�args)r3 �printerr& r& r' �_latex� s ��zQuantity._latexc C s ddl m} || ||�S )a�
Convert the quantity to another quantity of same dimensions.
Examples
========
>>> from sympy.physics.units import speed_of_light, meter, second
>>> speed_of_light
speed_of_light
>>> speed_of_light.convert_to(meter/second)
299792458*meter/second
>>> from sympy.physics.units import liter
>>> liter.convert_to(meter**3)
meter**3/1000
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r N) re �sympyr r r � sympy.physics.units.dimensionsr � sympy.physics.units.prefixesr �sympy.utilities.exceptionsr r r& r& r& r' �<module> s