我正在将基数为10的数字转换为基数为2的数字,并指定我想用来表示这些基数为10的数字。
这是我的负数代码:
function output = DTB(decimal,binary)
if decimal < 0
smallestNum = -(2^(bits-1));
if decimal < smallestNum
error('%d cannot be represented in %d bits. Increase the number of bits. ',decimal,bits);
output = '';
end
output = '1';
bits = bits - 1;
if smallestNum == decimal
while bits ~= 0
output = [output,'0'];
bits = bits - 1;
end
end
num = smallestNum;
while num ~= decimal
num = smallestNum + 2^(bits-1);
if num > decimal
output = [output,'0'];
else
output = [output,'1'];
smallestNum = smallestNum + 2^(bits-1);
end
bits = bits - 1;
end
while bits ~= 0
output = [output,'0'];
bits = bits - 1;
end
end
这很好用。我遇到的问题(奇怪的是,因为从正小数到二进制应该更容易)是正整数。它只是对负数算法的一个小调整,对吗?例如,正数字段在decimal
= 8和bits
= 6的情况下不起作用(它不适用于2的不同幂)。这有什么不对吗?
这里是正整数的代码:
if decimal > 0
largestNum = (2^(bits-1))-1;
if decimal > largestNum
error('%d cannot be represented in %d bits. Increase the number of bits. ',decimal,bits);
output = '';
end
% first spot must be zero to show it's a positive number
output = '0';
bits = bits - 1;
largestNum = largestNum + 1;
num = largestNum;
while num ~= decimal
num = largestNum - 2^(bits-1);
if num > decimal
output = [output,'0'];
end
if num <= decimal
output = [output,'1'];
largestNum = largestNum - 2^(bits-1);
end
bits = bits - 1;
end
while bits ~= 0
output = [output,'0'];
bits = bits - 1;
end
答案 0 :(得分:2)
当您在输出数组中放置零时,需要减少最大数量,因为您实际上是从所有1的二进制数组(即maximumNum)开始。这段代码对我有用:
if decimal > 0
largestNum = (2^(bits-1))-1;
if decimal > largestNum
error('%d cannot be represented in %d bits. Increase the number of bits. ',decimal,bits);
output = '';
end
% first spot must be zero to show it\'s a positive number
output = '0';
bits = bits - 1;
largestNum = largestNum + 1;
num = largestNum;
while num ~= decimal
num = largestNum - 2^(bits-1);
if num > decimal
output = [output,'0'];
largestNum = largestNum - 2^(bits-1);
end
if num <= decimal
output = [output,'1'];
end
bits = bits - 1;
end
while bits ~= 0
output = [output,'0'];
bits = bits - 1;
end
end
我不确定这是为了什么,但我强烈建议使用内置的dec2bin来执行此操作。
答案 1 :(得分:-1)
你可以在matlab中使用这个脚本:
a=[1 2 3 4;-2 -4 3 4;7 8 9 4];
[c,v]=size(a);
n3=c*v;
word_len=5;%with bits of binary word
data = reshape(a', n3, 1);
databin= fi(data,1,5);
h=bin(databin)%result