www.gusucode.com > fixedpoint 案例源码程序 matlab代码 > fixedpoint/CreateafiObjectWithNegativeFractionLengthExample.m
%% Create a fi Object With Negative Fraction Length % When you use binary-point representation for a fixed-point number, the % fraction length can be negative. In this case, there are implicit trailing % zeros (for positive numbers) or ones (for negative numbers) between the % binary point and the first significant binary digit. % % Consider a signed value with a word length of 8, fraction length of –2 % and a stored integer value of 5. We can calculate the real-world value. % % RealWorldValue = StoredInteger * 2 ^ -FractionLength % RealWorldValue = 5 * 2 ^ 2 = 20 %% % Create a signed |fi| object with a value of |20|, a word length of 8 bits, % and a fraction length of –2 bits. a = fi(20, true, 8, -2) %% % Get the stored integer value of |a|. a.int %% % Get the binary value of the stored integer. a.bin %% % Because the fraction length is negative, the binary value of the stored % integer is |00000101xx| , where |x| is a placeholder for implicit zeros. % |000000010100| (binary) is equivalent to |20| (decimal).