If you are running hooke from the source directory (see
:doc:`install`), the equivalent command is::
- $ python bin/hooke
+ $ python bin/hk.py
You may need to give the full path for Python on Windows systems, and
also check that the current working directory (`.`) is in your
Creating a playlist
-------------------
-To start analyzing your curves, you first have to build a playlist. The
-playlist is just an index of the force curve files you want to
-analyze. Imagine it as a music playlist (that’s why it is called a
+To start analyzing your curves, you first have to build a playlist.
+The playlist is just an index of the force curve files you want to
+analyze. Imagine it as a music playlist (that’s why it is called a
playlist), but with data files instead of audio files.
Suppose you have 100 PicoForce curve files in your curves directory,
Now you are ready to generate the playlist. First, create a blank playlist::
- hooke> new_playlist --name mylist
+ hooke> new_playlist --output_playlist mylist
Ensure that the new playlist is active::
The ``--`` in the ``jump_to_playlist`` command lets
``jump_to_playlist`` know that ``-1`` is an argument and not an
option. Using the bare ``--`` is a POSIX specification [#POSIX]_
-supported by the `optparse module`_.
+supported by the `optparse module`_. You don't need to jump if
+the new playlist is your only loaded playlist.
.. _optparse module:
http://docs.python.org/library/optparse.html#callback-example-6-variable-arguments
necessary.
If, generating the playlist, you are including by chance a non-force
-curve file that Hooke cannot open, Hooke will print an error and
+curve file that Hooke cannot open, Hooke will log a warning and
continue on.
Navigating the playlist
hooke> jump_to_curve 14
-will jump to the 14th curve in the playlist. TODO: jump_to_curve
-<PATH>, where the path can be either an absolute path or a path
-relative to the directory holding the playlist file.
+will jump to the 14th curve in the zero-indexed playlist.
+
+.. todo:: ``jump_to_curve <PATH>``, where the path can be either an
+ absolute path or a path relative to the directory holding the
+ playlist file.
+
+Replace ``curve`` with ``playlist`` in the above commands to navigate
+around through the list of loaded playlists.
Taking notes
------------
You can take notes about the curves you are looking at. Just type
``set_note`` followed by the text you want to attach to that curve.
Hooke will save the text in your current playlist and in an external
-log file (TODO: no external file yet. Is this important?). The
-output will look like this::
+log file.
+
+.. todo:: No external file yet. Is this important?
+
+The output will look like this::
Notes taken at Sun Sep 17 20:42:07 2006
/home/cyclopia/work/tris/20060620a.041 | This is a note
Usually curves you annotated are useful later. You can create a
playlist for only annotated curves with
- hooke> note_filter_playlist --name c:\curves\nice.hkp
+ hooke> note_filter_playlist --output_playlist nice_list
-will create sub-playlist :file:`c:\curves\nice.hkp`. Make sure that
-the target directory (here :file:`c:\curves\`) already exists before
-doing that.
+will create sub-playlist `nice_list`. Remember to save the new list
+if you like it.
If you change your mind about a note, you can remove it by setting a
blank note string with ``set_note ''``.
Exporting curves
----------------
-You can export Hooke curves as images and as text columns. To export
+You can export Hooke curves as images and as text columns. To export
as images or text, use the ``export_block`` command. Supported
formats are PNG (Portable Network Graphic, raster) and EPS
(Encapsulated Postscript, vector). The export format is determined by
-the filename extension, so ``export_block foo.png``, ``export_block
-foo.eps``, and ``export_block foo.txt`` will save PNG, EPS, and
-TAB-delimited text files respectively.
+the filename extension, so ``export_block --output foo.png``,
+``export_block --output foo.eps``, and ``export_block --output
+foo.txt`` will save PNG, EPS, and TAB-delimited text files
+respectively.
-TODO: multiple cycles? Solution: blank lines for "breaks", add option
-to extract specific sections using Python's slice notation.
+.. todo:: Currently no PNG or EPS output, use the GUI and the plot
+ panel's toolbar for non-text exports.
+
+.. todo:: Multiple cycles in exported data? Solution: blank lines for
+ "breaks", add option to extract specific sections using Python's
+ slice notation.
If you don't want the entire block, try the ``cut`` command.
-Interacting with the plot
--------------------------
+Analysis
+--------
-(no plots in command line mode...)
+The commands we have covered so far allow basic bookkeeping. The
+point of Hooke, though, is to allow you to easily analyze force
+spectroscopy data. We cover those analysis commands in this section.
Measuring distances and forces
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-You can easily zoom in the plot by dragging a rectangle on it with the
-left mouse button. To zoom out, click the right mouse
-button. Sometimes by zooming in and out too much, you can lose the
-picture (this is probably a small bug in Matplotlib). Just type
-``plot`` at the command line and the curve will be refreshed.
+To measure the distance between points, use the ``delta`` command.
+For example,::
+
+ hooke> delta 300 500
-You can measure distances and forces directly in the plot. Just issue
-the command ``distance``. You will be asked to click two points.
-When you click a point, a blue dot should appear. When you click the
-second point, the distances (in nanometers and piconewtons) will
-appear on the command line. You can use ``delta`` if you prefer,
-which gives meaningful values for every kind of graph (not only force
-curves). If you want to know the coordinates of a single point, use
-``point``.
+will measure the distance between the 300th point and the 500th point.
+One difficulty with the command line interface is that is difficult
+to know which points you're interested without seeing the plot. The
+two ways around this are:
-Hooke automatically adjusts the position of the clicked point to the
-nearest point in the graph, so you will be always measuring distances
-and forces between points in the graph.
+1) Export the block (with ``export_block``), and graph the exported
+ file with a program of your choice (e.g. Gnuplot_). Use the
+ resulting graph to determine the indices of the points you are
+ interested in.
+2) Run Hooke's GUI instead of the command line when you need to make
+ manual measurements. See :doc:`gui` for details.
-The commands ``force`` and ``distance`` are present in the
-``generalvclamp`` plugin.
+.. _Gnuplot: http://gnuplot.sourceforge.net/
Worm like chain and freely jointed chain fitting
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-You can measure by hand the parameters relative to a force peak using
-a worm-like chain fitting with the ``fit`` command. The command by
-default automatically finds the contact point, asks for two points
-delimiting the portion to fit, and performs a two-variable fit, with
-contour length, persistence length, and their relative errors as
-output. If desired, one can use the ``noauto`` option to manually
-click the contact point, and/or the ``pl=NUMBER`` options to impose a
-specific persistence or Kuhn length (in nanometers). You can choose
-which model to use with ``set fit_function wlc`` or ``set fit_function
-fjc``. See the help of the ``fit`` command from the Hooke command
-line for details.
+Polymer model fitting is a complicated beast. To correctly fit your
+chosen model (WLC, FJC, etc.), you need to execute a multi-step
+analysis. Hooke provides a flexible chain of curve analyisis commands
+that create new data columns (e.g. `deflection (N)`) or store
+information in a curve's `info` dictionary (e.g. `flat filter peaks`).
+You can, if necessary, adjust the names of input and output columns
+and `info` values to combine the available commands in new and useful
+ways.
+
+ hooke> zero_surface_contact_point --block retract
+ hooke> flat_filter_peaks --block retract --min_points 1
+ hooke> zero_surface_contact_point --block retract
+ ... --ignore_after_last_peak_info_name 'flat filter peaks'
+ hooke> convert_distance_to_force --block retract
+ ... --deflection_column 'surface deflection (m)'
+ hooke> remove_cantilever_from_extension --block retract
+ hooke> flat_peaks_to_polymer_peaks --block retract
+ hooke> polymer_fit_peaks --block retract
+ hooke> export_block --block retract --output myblock.dat
+
+See each command's `Help`_ for details.
+
+.. todo:: Discuss command stacks and polymer model fitting.
Multiple curve fitting and measuring
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. todo:: Update multiple curve fitting tutorial section.
You can cycle through all your current playlist obtaining WLC fit, FJC
fit, rupture force and slope (loading rate) information from each
Fast curve reviewing and saving
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. todo:: Update curve review tutorial section.
+
When automatic routines are not good enough to filter your data, use
``review`` command to cycle through your playlist presenting ten
curves in the same graph. You can then enter the numbers of the
Configuring Hooke
-----------------
-You can set environment variables to influence the behaviour of
-Hooke. The command to use is ``set_config``. Use ``get_config`` to
-read a particular option and ``print_config`` to display the entire
-configuration file. Any changes to the configuration will be saved
-when you exit Hooke, see :doc:`config` for details.
+You can set environment variables to influence the behaviour of Hooke.
+The command to use is ``set_config``. Use ``get_config`` to read a
+particular option and ``print_config`` to display the entire
+configuration file. To save changes, either run ``save_config`` or
+start Hooke with the ``--save-config`` option. See :doc:`config` for
+details.
projects / hooke.git / blobdiff