hello everbody hahzu contain

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[Walter Roberson]

what is a sample input?

[Stephen23]

Original question retrieved from Google Cache:

https://webcache.googleusercontent.com/search?q=cache:798JLRPpwE8J:https://uk.mathworks.com/matlabcentral/answers/749774-dual-code-in-decimal-number-function%3Fs_tid%3Dsrchtitle+&cd=2&hl=de&ct=clnk&gl=hu&client=safari

https://web.archive.org/web/20210219132027/https://www.mathworks.com/matlabcentral/answers/749774-hello-everbody-hahzu-contain

"Dual-Code in decimal number function?"

Hello people,

i want to convert a dual/binary Number to a decimal number. (Without using bin2dec, dec2bin or other)

Here is my function but when i try it, then the output is = NaN

Please help me.

function y = function_dual_decimal(x)
total = 0;
for i = 1 : length(x)
 total = total + str2double(x(i)) * 2^(length(x) - i);
end
format long
y = total;
end

[Les Beckham]

Thank you @Stephen Cobeldick for restoring the original question. I still don't understand why people delete their questions when they get an answer.

Answer 1

[Les Beckham]

Your code does what you want if you pass it a character array. For example if you pass '11', you get 3 as a result. Note the single quotes. They are necessary.

Interestingly, it does not work with the new string type using double quotes. Passing "11" results in 11 (yes, 11 as a double). Totally not expected and, in my mind, a bug.

edit: actually, the reason for this is that the length of "11" is one, while the length of '11' is two. So, this is expected

As you discovered, passing a number to this doesn't work. The function calls str2double which doesn't expect a number.

When you pass the number 11 you are essentially doing str2double(11) which returns NaN.

By the way, can you explain what you mean by a "dual/binary" number? I'm not acquainted with "dual" numbers. Perhaps that refers to base 2 (similar to how decimal refers to base 10)? Maybe I'll learn something new today. I like when I can do that.