-                      r3d164b9
+                      r7f23423
 .. _Writing_a_Plugin:
+Writing a Plugin
+================
+Users can write their own models and save it to the the SasView
+Writing a Plugin Model
+======================
+Overview
+^^^^^^^^
+You can write your own model and save it to the the SasView
 *plugin_models* folder
   *C:\\Users\\[username]\\.sasview\\plugin_models* - (on Windows)
+  *C:\\Users\\[username]\\.sasview\\plugin_models* (on Windows)
 The next time SasView is started it will compile the plugin and add
 it to the list of *Customized Models*.  It is recommended that an
+it to the list of *Customized Models* in a FitPage.  It is recommended that an
 existing model be used as a template.
-This page was originally written by our MOST experienced developers,
-but has subsequently been edited by our LEAST experienced developer who felt
-some instructions could have been clearer, and learnt one or two things that
-were missing altogether! But they succeeded in converting a model that passed
-testing, so there is no reason why you should not be able to do the same.
 SasView has three ways of writing models:
 …
   `cylinder.c <https://github.com/SasView/sasmodels/blob/master/sasmodels/models/cylinder.c>`_
-Many models are available for download from the
-`model marketplace <http://marketplace.sasview.org/>`_.
 The built-in modules are available in the *sasmodels-data\\models* subdirectory
 of the sasview installation folder.  On Windows, this will be something like
 *C:\\Program Files (x86)\\SasView\\sasmodels-data.  On MacOSX, these will be within
+of your SasView installation folder.  On Windows, this will be something like
+*C:\\Program Files (x86)\\SasView\\sasmodels-data\\models*.  On Mac OSX, these will be within
 the application bundle as
 */Applications/SasView 4.0.app/Contents/Resources/sasmodels-data/models*.
+Other models are available for download from our
+`Model Marketplace <http://marketplace.sasview.org/>`_. You can contribute your own models to the
+Marketplace aswell.
 Create New Model Files
 …
 *Please follow these naming rules:*
 - No capitalization and thus no CamelCase.
+- No capitalization and thus no CamelCase
 - If necessary use underscore to separate words (i.e. barbell not BarBell or
   broad_peak not BroadPeak)
 …
 ^^^^^^^^^^^^^^^^^^^^
+Model Contents
+..............
 The model interface definition is in the .py file.  This file contains:
 …
     - without spaces (use underscores to separate words instead)
     - without any capitalization or CamelCase
     - without incorporating the word 'model'
+    - without incorporating the word "model"
     - examples: *barbell* **not** *BarBell*; *broad_peak* **not** *BroadPeak*;
       *barbell* **not** *BarBellModel*
 …
    - this is the **title** string in the *.py* file
    - this is a one or two line description of the model, which will appear
      at the start of the model documentation and as a tooltip in the GUI
+     at the start of the model documentation and as a tooltip in the SasView GUI
 - a **short discription**:
    - this is the **description** string in the *.py* file
    - this is a medium length description which appears when you click
      *Description* on the model fit page
+     *Description* on the model FitPage
 - a **parameter table**:
 …
    - this is ReStructuredText enclosed between the r""" and """ delimiters
      at the top of the *.py* file
+   - what you write here is abstracted into the help documentation
+   - what you write here is abstracted into the SasView help documentation
+   - this is what other users will refer to when they want to know what your model does;
+     so please be helpful!
 - a **definition** of the model:
 …
 - a **plot** of the function, with a **figure caption**:
    - this is automatically generated from the default parameters
+   - this is automatically generated from your default parameters
 - at least one **reference**:
 …
 The model should include a **formula** written using LaTeX markup.
 The above example uses the *math* command to make a displayed equation.  You
+The example above uses the *math* command to make a displayed equation.  You
 can also use *\$formula\$* for an inline formula. This is handy for defining
 the relationship between the model parameters and formula variables, such
 as the phrase "\$r\$ is the radius" used above.  The live demo MathJax
 page `<http://www.mathjax.org/>`_ is handy for checking that the equations
 will look like you expect.
+will look like you intend.
 Math layout uses the `amsmath <http://www.ams.org/publications/authors/tex/amslatex>`_
 …
     name = "sphere"  # optional: defaults to the filename without .py
     title = "Spheres with uniform scattering length density"
     description = """\
     P(q)=(scale/V)*[3V(sld-sld_solvent)*(sin(qr)-qr cos(qr))
 …
         sld_solvent: the SLD of the solvent
     """
     category = "shape:sphere"
     single = True   # optional: defaults to True
     opencl = False  # optional: defaults to False
     structure_factor = False  # optional: defaults to False
 …
 **title = "short description"** is short description of the model which
 is included after the model name in the automatically generated documentation.
 The title can also be used for a tooltip, for example.
+The title can also be used for a tooltip.
 **description = """doc string"""** is a longer description of the model. It
 shows up when you press the "Description" button of the SasView fit page.
+shows up when you press the "Description" button of the SasView FitPage.
 It should give a brief description of the equation and the parameters
 without the need to read the entire model documentation. The triple quotes
 allow you to write the description over multiple lines. Keep the lines
 short since the GUI will wrap each one separately if they are too long.
 **Make sure the parameter names in the description match the model definition.**
+**Make sure the parameter names in the description match the model definition!**
 **category = "shape:sphere"** defines where the model will appear in the
 model documentation.  In this example, the model will appear alphabetically
 in the list of spheroid models.
+in the list of spheroid models in the *Shape* category.
 **single = True** indicates that the model can be run using single
 …
         ["radius",      "Ang",        50, [0, inf],    "volume", "Sphere radius"],
+    ]
-    # pylint: disable=bad-whitespace, line-too-long
 **parameters = [["name", "units", default, [min,max], "type", "tooltip"],...]**
+defines the parameters form the model.
+- **the order of the parameters in the definition will be the order of
+  the parameters in the user interface and the order of the parameters
+  in Iq(), Iqxy() and form_volume().**
+- **scale and background parameters are implicit to all models, so
+  they do not need to be included in the parameter table**
+- **"name"** is the name of the parameter shown on the fit screen
+defines the parameters that form the model.
+**Note: The order of the parameters in the definition will be the order of the
+parameters in the user interface and the order of the parameters in Iq(),
+Iqxy() and form_volume(). And** *scale* **and** *background* **parameters are
+implicit to all models, so they do not need to be included in the parameter table.**
+- **"name"** is the name of the parameter shown on the FitPage.
   - parameter names should follow the mathematical convention; e.g.,
+    *radius_core* not *core_radius*, or *sld_solvent* not *solvent_sld*
+    *radius_core* not *core_radius*, or *sld_solvent* not *solvent_sld*.
   - model parameter names should be consistent between different models,
     so *sld_solvent*, for example, should have exactly the same name
+    in every model
+    in every model.
   - to see all the parameter names currently in use, type the following in the
     python shell/editor under the Tools menu::
 …
     *re-use* as many as possible!!!
   - use "name[n]" for multiplicity parameters, where *n* is the name of
     the parameter defining the number of shells/layers/segments, etc.
 …
 - **"units"** are displayed along with the parameter name
+  - every parameter should have units; use "None" if there are no units
+  - every parameter should have units; use "None" if there are no units.
   - **sld's should be given in units of 1e-6/Ang^2, and not simply
 /Ang^2 to be consistent with the builtin models.  Adjust your formulas
     appropriately.**
   - fancy units markup is available for some units, including::
 …
       and using negative exponents instead of the / operator, though
       the unit name should use the / operator for consistency.
     - post a message to the sasview developers list with the changes
 - **default** is the initial value for the parameter
+    - please post a message to the SasView developers mailing list with your changes.
+- **default** is the initial value for the parameter.
   - **the parameter default values are used to auto-generate a plot of
     the model function in the documentation.**
+- **[min, max]** are the lower and upper limits on the parameter
+  - lower and upper limits can be any number, or -inf or inf.
+- **[min, max]** are the lower and upper limits on the parameter.
+  - lower and upper limits can be any number, or *-inf* or *inf*.
   - the limits will show up as the default limits for the fit making it easy,
     for example, to force the radius to always be greater than zero.
 - **"type"** can be one of: "", "sld", "volume", or "orientation"
+- **"type"** can be one of: "", "sld", "volume", or "orientation".
   - "sld" parameters can have magnetic moments when fitting magnetic models;
     depending on the spin polarization of the beam and the $q$ value being
     examined, the effective sld for that material will be used to compute the
+    scattered intensity
+    scattered intensity.
   - "volume" parameters are passed to Iq(), Iqxy(), and form_volume(), and
     have polydispersity loops generated automatically.
   - "orientation" parameters are only passed to Iqxy(), and have angular
     dispersion.
 …
 .............
 For pure python models, define the Iq funtion::
+For pure python models, define the *Iq* function::
       import numpy as np
 …
 The parameters *par1, par2, ...* are the list of non-orientation parameters
 to the model in the order that they appear in the parameter table.
 **Note that the autogenerated model file uses *x* rather than *q*.**
+**Note that the autogenerated model file uses** *x* **rather than** *q*.
 The *.py* file should import trigonometric and exponential functions from
 numpy rather that from math.  This lets us evaluate the model for the whole
+numpy rather than from math.  This lets us evaluate the model for the whole
 range of $q$ values at once rather than looping over each $q$ separately in
 python.  With $q$ as a vector, you cannot use if statements, but must instead
 …
 list includes the *volume* parameters in order.  This is used for a weighted
 volume normalization so that scattering is on an absolute scale.  If
 *form_volume* is not definded, then the default *form_volume = 1.0* will be
+*form_volume* is not defined, then the default *form_volume = 1.0* will be
 used.
 …
 .................
 Like pure python models, inline C models need define an *Iq* function::
+Like pure python models, inline C models need to define an *Iq* function::
     Iq = """
 …
 These functions have been tuned to be fast and numerically stable down
 to $q=0$ even in single precision.  In some cases they work around bugs
 which appear on some platforms but not others.
+which appear on some platforms but not others. So use them where needed!!!
 Models are defined using double precision declarations for the
 parameters and return values.  Declarations and constants will be converted
 to float or long double depending on the precision requested.
 **Floating point constants must include the decimal point.**  This allows us
 to convert values such as 1.0 (double precision) to 1.0f (single precision)
 …
 A value defined as SAS_DOUBLE will stay double precision; this should
 not be used since some graphics card don't support double precision.
+not be used since some graphics cards do not support double precision.
 …
 consider adding your model to the
 `model marketplace <http://marketplace.sasview.org/>`_.

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