http://code.activestate.com/recipes/users/98107/2005-05-01T10:54:00-07:00ActiveState Code Recipes2005-05-01T10:54:00-07:00Alexander Pletzerhttp://code.activestate.com/recipes/users/98107/http://code.activestate.com/recipes/410158-fractal-tree/

<p style="color: grey"> Python recipe 410158 by <a href="/recipes/users/98107/">Alexander Pletzer</a> (<a href="/recipes/tags/graphics/">graphics</a>). Revision 4. </p> <p>This simple program can be used to compute and display a 2D fractal tree.</p>

2002-04-19T07:10:42-07:00Alexander Pletzerhttp://code.activestate.com/recipes/users/98107/http://code.activestate.com/recipes/121574-matrix-vector-multiplication/

<p style="color: grey"> Python recipe 121574 by <a href="/recipes/users/98107/">Alexander Pletzer</a> (<a href="/recipes/tags/algorithms/">algorithms</a>). </p> <p>Using 'reduce' and 'map', this code shows how a matrix vector multiplication can be reduced to a single loop.</p>

2005-04-20T12:46:35-07:00Alexander Pletzerhttp://code.activestate.com/recipes/users/98107/http://code.activestate.com/recipes/52273-colormap-returns-an-rgb-tuple-on-a-0-to-255-scale-/

<p style="color: grey"> Python recipe 52273 by <a href="/recipes/users/98107/">Alexander Pletzer</a> (<a href="/recipes/tags/graphics/">graphics</a>). Revision 5. </p> <p>These functions, when given a magnitude 'mag' between cmin and cmax, return a colour tuple (red, green, blue) on a 0 to 255 scale. The tuple can consist of strings (strRgb) as required in Tk calls, or integers (rgb) as required in Java applications.</p>

2001-04-05T20:31:05-07:00Alexander Pletzerhttp://code.activestate.com/recipes/users/98107/http://code.activestate.com/recipes/52292-gaussian-quadrature-with-or-without-log-singularit/

<p style="color: grey"> Python recipe 52292 by <a href="/recipes/users/98107/">Alexander Pletzer</a> (<a href="/recipes/tags/algorithms/">algorithms</a>). Revision 2. </p> <p>If you have the freedom to choose your abscissas and your integrand is smooth or has a log singularity, then this script is for you. It computes the definite integral of a user defined function over the interval [a, b]. The user can specify the number of Gauss points (1 &lt;= ng &lt;= 12), the default being ng=10.</p>

2002-04-15T18:22:16-07:00Alexander Pletzerhttp://code.activestate.com/recipes/users/98107/http://code.activestate.com/recipes/52272-vector-a-list-based-vector-class-supporting-elemen/

<p style="color: grey"> Python recipe 52272 by <a href="/recipes/users/98107/">Alexander Pletzer</a> (<a href="/recipes/tags/graphics/">graphics</a>). Revision 3. </p> <p>This vector class stores elements in a list and hence allows the 'vector' to grow dynamically. Common mathematical functions (sin, cosh, etc) are supported elementwise and so are a number of 'external' operations (dot for the inner product between vectors, norm, sum etc.). This class does not rely on NumPy but can be used in conjunction with a 'sparse' matrix class to solve linear systems. Tested using Python 2.0 and Jython 2.0.</p>

2005-04-18T00:17:29-07:00Alexander Pletzerhttp://code.activestate.com/recipes/users/98107/http://code.activestate.com/recipes/52275-sparse-a-dictionary-based-sparse-matrix-class/

<p style="color: grey"> Python recipe 52275 by <a href="/recipes/users/98107/">Alexander Pletzer</a> (<a href="/recipes/tags/graphics/">graphics</a>). Revision 6. </p> <p>'sparse' is a matrix class based on a dictionary to store data using 2-element tuples (i,j) as keys (i is the row and j the column index). The common matrix operations such as 'dot' for the inner product, multiplication/division by a scalar, indexing/slicing, etc. are overloaded for convenience. When used in conjunction with the 'vector' class, 'dot' products also apply between matrics and vectors. Two methods, 'CGsolve' and 'biCGsolve', are provided to solve linear systems. Tested using Python 2.2.</p>