www.gusucode.com > 图像压缩编码码matlab实现 > 图像压缩编码码matlab实现/常用参数计算/frequency.m
function f = frequency(vector) %函数frequency计算各符号出现的概率 if ~isa(vector, 'uint8') error('input argument must be a uint8 vector'); end f = repmat(0, 1, 256); len = length(vector); for index = 0:255 f(index+1) = sum(vector == uint8(index)); end f = f./len; %归一化