Simple data structures

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Next: struct NEUT Up: Data structures Previous: Data structures Contents Index

Simple data structures

The simplest data structures we use are vectors and matrices. A vector is a pointer (ie an address) which points to the first element of the vector. The ith element is addressed using [i] after the variable name of the vector. The memory layout of a vector is illustrated in Figure 3.3.

A matrix is a double pointer, ie a pointer which points to an array of pointers whose elements points to an array of matrix elements. The (i,j)th element of the matrix is addressed using [i][j] after the variable name to the matrix. The memory layout of a matrix is depicted in Figure 3.4.

$\begin{figure} % latex2html id marker 13172\rule{\textwidth}{0.2mm} \rule{0cm}... ... The $*$\ in front of a variable name indicates a pointer variable.}\end{figure}$

$\begin{figure} % latex2html id marker 13192\rule{\textwidth}{0.2mm} \rule{0cm}... ...riable (ie a pointer which points to another pointer) respectively.}\end{figure}$

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