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authorDeterminant <[email protected]>2015-06-02 12:53:08 +0800
committerDeterminant <[email protected]>2015-06-02 12:53:08 +0800
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+#The Nerv Matrix Package#
+Part of the [Nerv](../README.md) toolkit.
+
+##Description##
+###Underlying structure###
+In the begining is could be useful to know something about the underlying structure of a __Nerv__ matrix.
+Every matrix object is a encapsulation of a C struct that describes the attributes of this matrix.
+```
+typedef struct Matrix {
+ size_t stride; /* size of a row */
+ long ncol, nrow, nmax; /* dimension of the matrix */
+ union {
+ float *f;
+ double *d;
+ long *i;
+ } data; /* pointer to actual storage */
+ long *data_ref;
+} Matrix;
+```
+It is worth mentioning that that `data_ref` is a counter which counts the number of references to its memory space, mind that it will also be increased when a row of the matrix is referenced(`col = m[2]`). A __Nerv__ matrix will deallocate its space when this counter is decreased to zero.
+Also note that all assigning operation in __Nerv__ is reference copy, you can use `copy_tod` or `copy_toh` method to copy value.
+
+###Class hierarchy###
+The class hierarchy of the matrix classes can be clearly observed in `matrix/init.c`.
+First there is a abstract base class __Nerv.Matrix__, which is inherited by __Nerv.CuMatrix__ and __Nerv.MMatrix__(also abstract).
+Finally, there is __Nerv.CuMatrixFloat__, __Nerv.CuMatrixDouble__, inheriting __Nerv.CuMatrix__, and __Nerv.MMatrixFloat__, __Nerv.MMatrixDouble__, inheriting __Nerv.MMatrix__.
+
+##Methods##
+Mind that usually a matrix object can only do calculation with matrix of its own type(a __Nerv.CuMatrixFloat__ matrix can only do add operation with a __Nerv.CuMatrixFloat__).
+In the methods description below, __Matrix__ could be __Nerv.CuMatrixFloat__, __Nerv.CuMatrixDouble__, __Nerv.MMatrixFloat__ or __Nerv.MMatrixDouble__.
+* __Matrix = Matrix(int nrow, int ncol)__
+Returns a __Matrix__ object of `nrow` rows and `ncol` columns. \ No newline at end of file