-# Copyright (C) 2008-2010 Alberto Gomez-Casado
-# Fabrizio Benedetti
+# Copyright (C) 2008-2010 Alberto Gomez-Kasai
+# Fabiano's Benedetti
# Massimo Sandal <devicerandom@gmail.com>
# W. Trevor King <wking@drexel.edu>
#
:mod:`hooke.curve` classes.
"""
+import copy
+
import numpy
from ..command import Command, Argument, Failure
from ..curve import Data
-from ..plugin import Builtin
-from ..plugin.playlist import current_playlist_callback
+from ..engine import CommandMessage
from ..util.calculus import derivative
from ..util.fft import unitary_avg_power_spectrum
-
-
-class CurvePlugin (Builtin):
- def __init__(self):
- super(CurvePlugin, self).__init__(name='curve')
- self._commands = [
- GetCommand(self), InfoCommand(self), ExportCommand(self),
- DifferenceCommand(self), DerivativeCommand(self),
- PowerSpectrumCommand(self)]
+from ..util.si import ppSI, join_data_label, split_data_label
+from . import Builtin
+from .playlist import current_playlist_callback
# Define common or complicated arguments
of the current playlist.
""".strip())
+def _name_argument(name, default, help):
+ """TODO
+ """
+ return Argument(name=name, type='string', default=default, help=help)
+
+def block_argument(*args, **kwargs):
+ """TODO
+ """
+ return _name_argument(*args, **kwargs)
+
+def column_argument(*args, **kwargs):
+ """TODO
+ """
+ return _name_argument(*args, **kwargs)
+
+
+# Define useful command subclasses
+
+class CurveCommand (Command):
+ """A :class:`~hooke.command.Command` operating on a
+ :class:`~hooke.curve.Curve`.
+ """
+ def __init__(self, **kwargs):
+ if 'arguments' in kwargs:
+ kwargs['arguments'].insert(0, CurveArgument)
+ else:
+ kwargs['arguments'] = [CurveArgument]
+ super(CurveCommand, self).__init__(**kwargs)
+
+ def _curve(self, hooke, params):
+ """Get the selected curve.
+
+ Notes
+ -----
+ `hooke` is intended to attach the selected curve to the local
+ playlist; the returned curve should not be effected by the
+ state of `hooke`. This is important for reliable
+ :class:`~hooke.command_stack.CommandStack`\s.
+ """
+ # HACK? rely on params['curve'] being bound to the local hooke
+ # playlist (i.e. not a copy, as you would get by passing a
+ # curve through the queue). Ugh. Stupid queues. As an
+ # alternative, we could pass lookup information through the
+ # queue...
+ return params['curve']
+
+ def _add_to_command_stack(self, params):
+ """Store the command name and current `params` values in the
+ curve's `.command_stack`.
+
+ If this would duplicate the command currently on top of the
+ stack, no action is taken. Call early on, or watch out for
+ repeated param processing.
+
+ Recommended practice is to *not* lock in argument values that
+ are loaded from the plugin's :attr:`.config`.
+
+ Notes
+ -----
+ Perhaps we should subclass :meth:`_run` and use :func:`super`,
+ or embed this in :meth:`run` to avoid subclasses calling this
+ method explicitly, with all the tedium and brittality that
+ implies. On the other hand, the current implemtnation allows
+ CurveCommands that don't effect the curve itself
+ (e.g. :class:`GetCommand`) to avoid adding themselves to the
+ stack entirely.
+ """
+ curve = self._curve(hooke=None, params=params)
+ if (len(curve.command_stack) > 0
+ and curve.command_stack[-1].command == self.name
+ and curve.command_stack[-1].arguments == params):
+ pass # no need to place duplicate calls on the stack.
+ else:
+ curve.command_stack.append(CommandMessage(
+ self.name, params))
+
+
+class BlockCommand (CurveCommand):
+ """A :class:`CurveCommand` operating on a :class:`~hooke.curve.Data` block.
+ """
+ def __init__(self, blocks=None, **kwargs):
+ if blocks == None:
+ blocks = [('block', None, 'Name of the data block to act on.')]
+ block_args = []
+ for name,default,help in blocks:
+ block_args.append(block_argument(name, default, help))
+ self._block_arguments = block_args
+ if 'arguments' not in kwargs:
+ kwargs['arguments'] = []
+ kwargs['arguments'] = block_args + kwargs['arguments']
+ super(BlockCommand, self).__init__(**kwargs)
+
+ def _block_names(self, hooke, params):
+ curve = self._curve(hooke, params)
+ return [b.info['name'] for b in curve.data]
+
+ def _block_index(self, hooke, params, name=None):
+ if name == None:
+ name = self._block_arguments[0].name
+ block_name = params[name]
+ if block_name == None:
+ curve = self._curve(hooke=hooke, params=params)
+ if len(curve.data) == 0:
+ raise Failure('no blocks in %s' % curve)
+ block_name = curve.data[0].info['name']
+ names = self._block_names(hooke=hooke, params=params)
+ try:
+ return names.index(block_name)
+ except ValueError, e:
+ curve = self._curve(hooke, params)
+ raise Failure('no block named %s in %s (%s): %s'
+ % (block_name, curve, names, e))
+
+ def _block(self, hooke, params, name=None):
+ # HACK? rely on params['block'] being bound to the local hooke
+ # playlist (i.e. not a copy, as you would get by passing a
+ # block through the queue). Ugh. Stupid queues. As an
+ # alternative, we could pass lookup information through the
+ # queue...
+ curve = self._curve(hooke, params)
+ index = self._block_index(hooke, params, name)
+ return curve.data[index]
+
+
+class ColumnAccessCommand (BlockCommand):
+ """A :class:`BlockCommand` accessing a :class:`~hooke.curve.Data`
+ block column.
+ """
+ def __init__(self, columns=None, **kwargs):
+ if columns == None:
+ columns = [('column', None, 'Name of the data column to act on.')]
+ column_args = []
+ for name,default,help in columns:
+ column_args.append(column_argument(name, default, help))
+ self._column_arguments = column_args
+ if 'arguments' not in kwargs:
+ kwargs['arguments'] = []
+ kwargs['arguments'] = column_args + kwargs['arguments']
+ super(ColumnAccessCommand, self).__init__(**kwargs)
+
+ def _get_column(self, hooke, params, block_name=None, column_name=None):
+ if column_name == None:
+ column_name = self._column_arguments[0].name
+ column_name = params[column_name]
+ block = self._block(hooke, params, block_name)
+ columns = block.info['columns']
+ try:
+ column_index = columns.index(column_name)
+ except ValueError, e:
+ raise Failure('%s not in %s (%s): %s'
+ % (column_name, block.info['name'], columns, e))
+ return block[:,column_index]
+
+
+class ColumnAddingCommand (ColumnAccessCommand):
+ """A :class:`ColumnAccessCommand` that also adds columns.
+ """
+ def __init__(self, new_columns=None, **kwargs):
+ if new_columns == None:
+ new_columns = []
+ column_args = []
+ for name,default,help in new_columns:
+ column_args.append(column_argument(name, default, help))
+ self._new_column_arguments = column_args
+ if 'arguments' not in kwargs:
+ kwargs['arguments'] = []
+ kwargs['arguments'] = column_args + kwargs['arguments']
+ super(ColumnAddingCommand, self).__init__(**kwargs)
+
+ def _get_column(self, hooke, params, block_name=None, column_name=None):
+ if column_name == None and len(self._column_arguments) == 0:
+ column_name = self._new_column_arguments[0].name
+ return super(ColumnAddingCommand, self)._get_column(
+ hooke=hooke, params=params, block_name=block_name,
+ column_name=column_name)
+
+ def _set_column(self, hooke, params, block_name=None, column_name=None,
+ values=None):
+ if column_name == None:
+ column_name = self._column_arguments[0].name
+ column_name = params[column_name]
+ block = self._block(hooke=hooke, params=params, name=block_name)
+ if column_name not in block.info['columns']:
+ new = Data((block.shape[0], block.shape[1]+1), dtype=block.dtype)
+ new.info = copy.deepcopy(block.info)
+ new[:,:-1] = block
+ new.info['columns'].append(column_name)
+ block = new
+ block_index = self._block_index(hooke, params, name=block_name)
+ self._curve(hooke, params).data[block_index] = block
+ column_index = block.info['columns'].index(column_name)
+ block[:,column_index] = values
+
+
+# The plugin itself
+
+class CurvePlugin (Builtin):
+ def __init__(self):
+ super(CurvePlugin, self).__init__(name='curve')
+ self._commands = [
+ GetCommand(self), InfoCommand(self), DeltaCommand(self),
+ ExportCommand(self), DifferenceCommand(self),
+ DerivativeCommand(self), PowerSpectrumCommand(self)]
+
# Define commands
-class GetCommand (Command):
+class GetCommand (CurveCommand):
"""Return a :class:`hooke.curve.Curve`.
"""
def __init__(self, plugin):
super(GetCommand, self).__init__(
- name='get curve', arguments=[CurveArgument],
- help=self.__doc__, plugin=plugin)
+ name='get curve', help=self.__doc__, plugin=plugin)
def _run(self, hooke, inqueue, outqueue, params):
- outqueue.put(params['curve'])
+ outqueue.put(self._curve(hooke, params))
+
-class InfoCommand (Command):
+class InfoCommand (CurveCommand):
"""Get selected information about a :class:`hooke.curve.Curve`.
"""
def __init__(self, plugin):
args = [
- CurveArgument,
Argument(name='all', type='bool', default=False, count=1,
help='Get all curve information.'),
]
help=self.__doc__, plugin=plugin)
def _run(self, hooke, inqueue, outqueue, params):
+ curve = self._curve(hooke, params)
fields = {}
for key in self.fields:
fields[key] = params[key]
for key in self.fields:
if fields[key] == True:
get = getattr(self, '_get_%s' % key.replace(' ', '_'))
- lines.append('%s: %s' % (key, get(params['curve'])))
+ lines.append('%s: %s' % (key, get(curve)))
outqueue.put('\n'.join(lines))
def _get_name(self, curve):
def _get_block_sizes(self, curve):
return [block.shape for block in curve.data]
-class ExportCommand (Command):
+
+class DeltaCommand (BlockCommand):
+ """Get distance information between two points.
+
+ With two points A and B, the returned distances are A-B.
+ """
+ def __init__(self, plugin):
+ super(DeltaCommand, self).__init__(
+ name='delta',
+ arguments=[
+ Argument(name='point', type='point', optional=False, count=2,
+ help="""
+Indicies of points bounding the selected data.
+""".strip()),
+ Argument(name='SI', type='bool', default=False,
+ help="""
+Return distances in SI notation.
+""".strip())
+ ],
+ help=self.__doc__, plugin=plugin)
+
+ def _run(self, hooke, inqueue, outqueue, params):
+ data = self._block(hooke, params)
+ As = data[params['point'][0],:]
+ Bs = data[params['point'][1],:]
+ ds = [A-B for A,B in zip(As, Bs)]
+ if params['SI'] == False:
+ out = [(name, d) for name,d in zip(data.info['columns'], ds)]
+ else:
+ out = []
+ for name,d in zip(data.info['columns'], ds):
+ n,units = split_data_label(name)
+ out.append(
+ (n, ppSI(value=d, unit=units, decimals=2)))
+ outqueue.put(out)
+
+
+class ExportCommand (BlockCommand):
"""Export a :class:`hooke.curve.Curve` data block as TAB-delimeted
ASCII text.
super(ExportCommand, self).__init__(
name='export block',
arguments=[
- CurveArgument,
- Argument(name='block', aliases=['set'], type='int', default=0,
- help="""
-Data block to save. For an approach/retract force curve, `0` selects
-the approaching curve and `1` selects the retracting curve.
-""".strip()),
Argument(name='output', type='file', default='curve.dat',
help="""
File name for the output data. Defaults to 'curve.dat'
help=self.__doc__, plugin=plugin)
def _run(self, hooke, inqueue, outqueue, params):
- data = params['curve'].data[int(params['block'])] # HACK, int() should be handled by ui
+ data = self._block(hooke, params)
+
+ with open(params['output'], 'w') as f:
+ if params['header'] == True:
+ f.write('# %s \n' % ('\t'.join(data.info['columns'])))
+ numpy.savetxt(f, data, delimiter='\t')
+
+
+class DifferenceCommand (ColumnAddingCommand):
+ """Calculate the difference between two columns of data.
- f = open(params['output'], 'w')
- if params['header'] == True:
- f.write('# %s \n' % ('\t'.join(data.info['columns'])))
- numpy.savetxt(f, data, delimiter='\t')
- f.close()
+ The difference is added to block A as a new column.
-class DifferenceCommand (Command):
- """Calculate the difference between two blocks of data.
+ Note that the command will fail if the columns have different
+ lengths, so be careful when differencing columns from different
+ blocks.
"""
def __init__(self, plugin):
super(DifferenceCommand, self).__init__(
- name='block difference',
- arguments=[
- CurveArgument,
- Argument(name='block one', aliases=['set one'], type='int',
- default=1,
- help="""
-Block A in A-B. For an approach/retract force curve, `0` selects the
-approaching curve and `1` selects the retracting curve.
+ name='difference',
+ blocks=[
+ ('block A', None,
+ 'Name of block A in A-B. Defaults to the first block'),
+ ('block B', None,
+ 'Name of block B in A-B. Defaults to matching `block A`.'),
+ ],
+ columns=[
+ ('column A', None,
+ """
+Column of data from block A to difference. Defaults to the first column.
""".strip()),
- Argument(name='block two', aliases=['set two'], type='int',
- default=0,
- help='Block B in A-B.'),
- Argument(name='x column', type='int', default=0,
- help="""
-Column of data block to differentiate with respect to.
+ ('column B', None,
+ """
+Column of data from block B to difference. Defaults to matching `column A`.
""".strip()),
- Argument(name='f column', type='int', default=1,
- help="""
-Column of data block to differentiate.
+ ],
+ new_columns=[
+ ('output column', None,
+ """
+Name of the new column for storing the difference (without units, defaults to
+`difference of <block A> <column A> and <block B> <column B>`).
""".strip()),
],
help=self.__doc__, plugin=plugin)
def _run(self, hooke, inqueue, outqueue, params):
- a = params['curve'].data[params['block one']]
- b = params['curve'].data[params['block two']]
- assert a[:,params['x column']] == b[:,params['x column']]
- out = Data((a.shape[0],2), dtype=a.dtype)
- out[:,0] = a[:,params['x column']]
- out[:,1] = a[:,params['f column']] - b[:,params['f column']]
- outqueue.put(out)
-
-class DerivativeCommand (Command):
+ self._add_to_command_stack(params)
+ params = self.__setup_params(hooke=hooke, params=params)
+ data_A = self._get_column(hooke=hooke, params=params,
+ block_name='block A',
+ column_name='column A')
+ data_B = self._get_column(hooke=hooke, params=params,
+ block_name='block B',
+ column_name='column B')
+ out = data_A - data_B
+ self._set_column(hooke=hooke, params=params,
+ block_name='block A',
+ column_name='output column',
+ values=out)
+
+ def __setup_params(self, hooke, params):
+ curve = self._curve(hooke, params)
+ if params['block A'] == None:
+ params['block A'] = curve.data[0].info['name']
+ if params['block B'] == None:
+ params['block B'] = params['block A']
+ block_A = self._block(hooke, params=params, name='block A')
+ block_B = self._block(hooke, params=params, name='block B')
+ if params['column A'] == None:
+ params['column A'] = block.info['columns'][0]
+ if params['column B'] == None:
+ params['column B'] = params['column A']
+ a_name,a_unit = split_data_label(params['column A'])
+ b_name,b_unit = split_data_label(params['column B'])
+ if a_unit != b_unit:
+ raise Failure('Unit missmatch: %s != %s' % (a_unit, b_unit))
+ if params['output column'] == None:
+ params['output column'] = join_data_label(
+ 'difference of %s %s and %s %s' % (
+ block_A.info['name'], a_name,
+ block_B.info['name'], b_name),
+ a_unit)
+ else:
+ params['output column'] = join_data_label(
+ params['output column'], a_unit)
+ return params
+
+
+class DerivativeCommand (ColumnAddingCommand):
"""Calculate the derivative (actually, the discrete differentiation)
- of a curve data block.
+ of a data column.
See :func:`hooke.util.calculus.derivative` for implementation
details.
"""
def __init__(self, plugin):
super(DerivativeCommand, self).__init__(
- name='block derivative',
- arguments=[
- CurveArgument,
- Argument(name='block', aliases=['set'], type='int', default=0,
- help="""
-Data block to differentiate. For an approach/retract force curve, `0`
-selects the approaching curve and `1` selects the retracting curve.
-""".strip()),
- Argument(name='x column', type='int', default=0,
- help="""
-Column of data block to differentiate with respect to.
-""".strip()),
- Argument(name='f column', type='int', default=1,
- help="""
-Column of data block to differentiate.
+ name='derivative',
+ columns=[
+ ('x column', None,
+ 'Column of data block to differentiate with respect to.'),
+ ('f column', None,
+ 'Column of data block to differentiate.'),
+ ],
+ new_columns=[
+ ('output column', None,
+ """
+Name of the new column for storing the derivative (without units, defaults to
+`derivative of <f column> with respect to <x column>`).
""".strip()),
+ ],
+ arguments=[
Argument(name='weights', type='dict', default={-1:-0.5, 1:0.5},
help="""
Weighting scheme dictionary for finite differencing. Defaults to
help=self.__doc__, plugin=plugin)
def _run(self, hooke, inqueue, outqueue, params):
- data = params['curve'].data[params['block']]
- outqueue.put(derivative(
- block, x_col=params['x column'], f_col=params['f column'],
- weights=params['weights']))
-
-class PowerSpectrumCommand (Command):
- """Calculate the power spectrum of a data block.
+ self._add_to_command_stack(params)
+ params = self.__setup_params(hooke=hooke, params=params)
+ x_data = self._get_column(hooke=hooke, params=params,
+ column_name='x column')
+ f_data = self._get_column(hooke=hooke, params=params,
+ column_name='f column')
+ d = derivative(
+ x_data=x_data, f_data=f_data, weights=params['weights'])
+ self._set_column(hooke=hooke, params=params,
+ column_name='output column',
+ values=d)
+
+ def __setup_params(self, hooke, params):
+ curve = self._curve(hooke, params)
+ x_name,x_unit = split_data_label(params['x column'])
+ f_name,f_unit = split_data_label(params['f column'])
+ d_unit = '%s/%s' % (f_unit, x_unit)
+ if params['output column'] == None:
+ params['output column'] = join_data_label(
+ 'derivative of %s with respect to %s' % (
+ f_name, x_name),
+ d_unit)
+ else:
+ params['output column'] = join_data_label(
+ params['output column'], d_unit)
+ return params
+
+
+class PowerSpectrumCommand (ColumnAddingCommand):
+ """Calculate the power spectrum of a data column.
"""
def __init__(self, plugin):
super(PowerSpectrumCommand, self).__init__(
- name='block power spectrum',
+ name='power spectrum',
arguments=[
- CurveArgument,
- Argument(name='block', aliases=['set'], type='int', default=0,
+ Argument(name='output block', type='string',
help="""
-Data block to act on. For an approach/retract force curve, `0`
-selects the approaching curve and `1` selects the retracting curve.
+Name of the new data block for storing the power spectrum (defaults to
+`power spectrum of <source block name> <source column name>`).
""".strip()),
- Argument(name='f column', type='int', default=1,
+ Argument(name='bounds', type='point', optional=True, count=2,
help="""
-Column of data block to differentiate with respect to.
+Indicies of points bounding the selected data.
""".strip()),
Argument(name='freq', type='float', default=1.0,
help="""
Sampling frequency.
+""".strip()),
+ Argument(name='freq units', type='string', default='Hz',
+ help="""
+Units for the sampling frequency.
""".strip()),
Argument(name='chunk size', type='int', default=2048,
help="""
help=self.__doc__, plugin=plugin)
def _run(self, hooke, inqueue, outqueue, params):
- data = params['curve'].data[params['block']]
- outqueue.put(unitary_avg_power_spectrum(
- data[:,params['f column']], freq=params['freq'],
- chunk_size=params['chunk size'],
- overlap=params['overlap']))
+ self._add_to_command_stack(params)
+ params = self.__setup_params(hooke=hooke, params=params)
+ data = self._get_column(hooke=hooke, params=params)
+ bounds = params['bounds']
+ if bounds != None:
+ data = data[bounds[0]:bounds[1]]
+ freq_axis,power = unitary_avg_power_spectrum(
+ data, freq=params['freq'],
+ chunk_size=params['chunk size'],
+ overlap=params['overlap'])
+ b = Data((len(freq_axis),2), dtype=data.dtype)
+ b.info['name'] = params['output block']
+ b.info['columns'] = [
+ params['output freq column'],
+ params['output power column'],
+ ]
+ self._curve(hooke, params).data.append(b)
+ self._set_column(hooke, params, block_name='output block',
+ column_name='output freq column',
+ values=freq_axis)
+ self._set_column(hooke, params, block_name='output block',
+ column_name='output power column',
+ values=power)
+ outqueue.put(b)
+
+ def __setup_params(self, hooke, params):
+ if params['output block'] in self._block_names(hooke, params):
+ raise Failure('output block %s already exists in %s.'
+ % (params['output block'],
+ self._curve(hooke, params)))
+ data = self._get_column(hooke=hooke, params=params)
+ d_name,d_unit = split_data_label(data.info['name'])
+ if params['output block'] == None:
+ params['output block'] = 'power spectrum of %s %s' % (
+ data.info['name'], params['column'])
+ self.params['output freq column'] = join_data_label(
+ 'frequency axis', params['freq units'])
+ self.params['output power column'] = join_data_label(
+ 'power density', '%s^2/%s' % (data_units, params['freq units']))
+ return params
+
+
+class OldCruft (object):
+
+ def do_forcebase(self,args):
+ '''
+ FORCEBASE
+ (generalvclamp.py)
+ Measures the difference in force (in pN) between a point and a baseline
+ took as the average between two points.
+
+ The baseline is fixed once for a given curve and different force measurements,
+ unless the user wants it to be recalculated
+ ------------
+ Syntax: forcebase [rebase]
+ rebase: Forces forcebase to ask again the baseline
+ max: Instead of asking for a point to measure, asks for two points and use
+ the maximum peak in between
+ '''
+ rebase=False #if true=we select rebase
+ maxpoint=False #if true=we measure the maximum peak
+
+ plot=self._get_displayed_plot()
+ whatset=1 #fixme: for all sets
+ if 'rebase' in args or (self.basecurrent != self.current.path):
+ rebase=True
+ if 'max' in args:
+ maxpoint=True
+
+ if rebase:
+ print 'Select baseline'
+ self.basepoints=self._measure_N_points(N=2, whatset=whatset)
+ self.basecurrent=self.current.path
+
+ if maxpoint:
+ print 'Select two points'
+ points=self._measure_N_points(N=2, whatset=whatset)
+ boundpoints=[points[0].index, points[1].index]
+ boundpoints.sort()
+ try:
+ y=min(plot.vectors[whatset][1][boundpoints[0]:boundpoints[1]])
+ except ValueError:
+ print 'Chosen interval not valid. Try picking it again. Did you pick the same point as begin and end of interval?'
+ else:
+ print 'Select point to measure'
+ points=self._measure_N_points(N=1, whatset=whatset)
+ #whatplot=points[0].dest
+ y=points[0].graph_coords[1]
+
+ #fixme: code duplication
+ boundaries=[self.basepoints[0].index, self.basepoints[1].index]
+ boundaries.sort()
+ to_average=plot.vectors[whatset][1][boundaries[0]:boundaries[1]] #y points to average
+
+ avg=np.mean(to_average)
+ forcebase=abs(y-avg)
+ print str(forcebase*(10**12))+' pN'
+ to_dump='forcebase '+self.current.path+' '+str(forcebase*(10**12))+' pN'
+ self.outlet.push(to_dump)
+
+ #---SLOPE---
+ def do_slope(self,args):
+ '''
+ SLOPE
+ (generalvclamp.py)
+ Measures the slope of a delimited chunk on the return trace.
+ The chunk can be delimited either by two manual clicks, or have
+ a fixed width, given as an argument.
+ ---------------
+ Syntax: slope [width]
+ The facultative [width] parameter specifies how many
+ points will be considered for the fit. If [width] is
+ specified, only one click will be required.
+ (c) Marco Brucale, Massimo Sandal 2008
+ '''
+
+ # Reads the facultative width argument
+ try:
+ fitspan=int(args)
+ except:
+ fitspan=0
+
+ # Decides between the two forms of user input, as per (args)
+ if fitspan == 0:
+ # Gets the Xs of two clicked points as indexes on the current curve vector
+ print 'Click twice to delimit chunk'
+ points=self._measure_N_points(N=2,whatset=1)
+ else:
+ print 'Click once on the leftmost point of the chunk (i.e.usually the peak)'
+ points=self._measure_N_points(N=1,whatset=1)
+
+ slope=self._slope(points,fitspan)
+
+ # Outputs the relevant slope parameter
+ print 'Slope:'
+ print str(slope)
+ to_dump='slope '+self.current.path+' '+str(slope)
+ self.outlet.push(to_dump)
+
+ def _slope(self,points,fitspan):
+ # Calls the function linefit_between
+ parameters=[0,0,[],[]]
+ try:
+ clickedpoints=[points[0].index,points[1].index]
+ clickedpoints.sort()
+ except:
+ clickedpoints=[points[0].index-fitspan,points[0].index]
+
+ try:
+ parameters=self.linefit_between(clickedpoints[0],clickedpoints[1])
+ except:
+ print 'Cannot fit. Did you click twice the same point?'
+ return
+
+ # Outputs the relevant slope parameter
+ print 'Slope:'
+ print str(parameters[0])
+ to_dump='slope '+self.curve.path+' '+str(parameters[0])
+ self.outlet.push(to_dump)
+
+ # Makes a vector with the fitted parameters and sends it to the GUI
+ xtoplot=parameters[2]
+ ytoplot=[]
+ x=0
+ for x in xtoplot:
+ ytoplot.append((x*parameters[0])+parameters[1])
+
+ clickvector_x, clickvector_y=[], []
+ for item in points:
+ clickvector_x.append(item.graph_coords[0])
+ clickvector_y.append(item.graph_coords[1])
+
+ lineplot=self._get_displayed_plot(0) #get topmost displayed plot
+
+ lineplot.add_set(xtoplot,ytoplot)
+ lineplot.add_set(clickvector_x, clickvector_y)
+
+
+ if lineplot.styles==[]:
+ lineplot.styles=[None,None,None,'scatter']
+ else:
+ lineplot.styles+=[None,'scatter']
+ if lineplot.colors==[]:
+ lineplot.colors=[None,None,'black',None]
+ else:
+ lineplot.colors+=['black',None]
+
+
+ self._send_plot([lineplot])
+
+ return parameters[0]
+
+
+ def linefit_between(self,index1,index2,whatset=1):
+ '''
+ Creates two vectors (xtofit,ytofit) slicing out from the
+ current return trace a portion delimited by the two indexes
+ given as arguments.
+ Then does a least squares linear fit on that slice.
+ Finally returns [0]=the slope, [1]=the intercept of the
+ fitted 1st grade polynomial, and [2,3]=the actual (x,y) vectors
+ used for the fit.
+ (c) Marco Brucale, Massimo Sandal 2008
+ '''
+ # Translates the indexes into two vectors containing the x,y data to fit
+ xtofit=self.plots[0].vectors[whatset][0][index1:index2]
+ ytofit=self.plots[0].vectors[whatset][1][index1:index2]
+
+ # Does the actual linear fitting (simple least squares with numpy.polyfit)
+ linefit=[]
+ linefit=np.polyfit(xtofit,ytofit,1)
+
+ return (linefit[0],linefit[1],xtofit,ytofit)
projects / hooke.git / blobdiff