Not Converting ASCII to DECIMAL
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I have converted decimal number to ASCII, however I cannot turn the same ASCII code back to it's decimal.
Here is the code:
%DECIMAL TO ASCII
a = 1;
%dec2bin(a); % decimal to binary conversion
b = double(num2str(a)); % decimal to ASCII conversion
%OP TO ASCII
%ASCII TO DECIMAL
c= str2double(b); %ISSUE
d=str2num(b); %ISSUE
0 件のコメント
回答 (2 件)
the cyclist
2019 年 11 月 23 日
c = b-'0'
2 件のコメント
the cyclist
2019 年 11 月 24 日
I poked around for some specific documentation on this behavior, but didn't find it.
I believe what is happening is that MATLAB converts the character array, so the above is equivalent to
c = b - double('0')
per isakson
2019 年 11 月 23 日
編集済み: per isakson
2019 年 11 月 24 日
I guess the problem is in the meaning of "Converting ASCII to DECIMAL".
The character '1' is represented by the decimal ascci number 49.
The function double() converts from character to decimal ascci number
>> double('1')
ans =
49
and char() converts from decimal ascci number to character
>> char(49)
ans =
'1'
str2double() and num2str() are something else. Look them up in the documentation.
>> str2double('1')
ans =
1
>>
>> num2str( 1 )
ans =
'1'
>>
2 件のコメント
per isakson
2019 年 11 月 24 日
編集済み: per isakson
2019 年 11 月 24 日
Run and answer with the keystrokes "1" and "Enter"
%%
n1=input('Enter n1: ');
class( n1 )
the output in the Command Window will be
Enter n1: 1
ans =
'double'
Thus, n1 returned by input() is already double. Matlab is smart enough to understand that the user wants a double :(
Run and answer with the keystrokes "1" and "Enter"
n1=input('Enter n1: ', 's' ); % notice the 's'
class( n1 )
the output in the Command Window is now
Enter n1: 1
ans =
'char'
The 's' forces input() to return characters and thus
a=double(n1)
returns decimal ascii numbers
a =
49
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