gusucode.com > datatypes 工具箱matlab源码程序 > datatypes/uint8.m
%UINT8 Convert to unsigned 8-bit integer. % I = UINT8(X) converts the elements of the array X into unsigned 8-bit % integers. X can be any numeric object, such as a DOUBLE. The values % of a UINT8 range from 0 to 255, or INTMIN('uint8') to INTMAX('uint8'). % Values outside this range saturate on overflow, namely they are mapped % to 0 or 255 if they are outside the range. If X is already an unsigned % 8-bit integer array, then UINT8 has no effect. DOUBLE and SINGLE values % are rounded to the nearest UINT8 value on conversion. % % Some arithmetic operations are defined for UINT8 on interaction with % other UINT8 arrays. For example, +, -, .*, ./, .\ and .^. % If at least one operand is scalar, *, /, \ and ^ are also defined. % UINT8 arrays may also interact with scalar DOUBLE variables, including % constants, and the result of the operation is UINT8. % UINT8 arrays saturate on overflow in arithmetic. % % You can define or overload your own methods for the UINT8 class (as you % can for any object) by placing the appropriately named method in an % @uint8 directory within a directory on your path. % Type HELP DATATYPES for the names of the methods you can overload. % % A particularly efficient way to initialize a large UINT8 arrays is: % % I = zeros(1000,1000,'uint8') % % which creates a 1000x1000 element UINT8 array, all of whose entries are % zero. You can also use ONES and EYE in a similar manner. % % Example: % X = 17 * ones(5,6,'uint8') % % See also DOUBLE, SINGLE, DATATYPES, ISINTEGER, UINT16, UINT32, UINT64, % INT8, INT16, INT32, INT64, INTMIN, INTMAX, EYE, ONES, ZEROS. % Copyright 1984-2004 The MathWorks, Inc. % Built-in function.