how to convert integer array to one value??

hi , i want to convert array such as x=[1;2;3;4;5] to one value as y=12345

Answer 1

[Guillaume]

x = [6 0 8 1 3 0];

validateattributes(x, {'numeric'}, {'integer', 'nonnegative', '<', 10});
y = polyval(x, 10)

[Joseph Cheng]

Thank you Guillaume, Never knew about the validateattributes. I was thinking of doing it like:

 y=str2num(num2str(x)');

[per isakson]

Your approach works

   >> str2num(sprintf('%1d',x))
    ans =
          608130

[Abdalla Mansour]

thank you Guillaume , Joseph Cheng and Per isakson

[Guillaume]

If you're going to go through string conversion, this should be the fastest:

y =str2num(char(x + '0'))

That is add ASCII value of '0' to each number and convert the string back to number.

conversions to / from strings are very slow compared to just multiplications / additions, so my initial solution is probably the most efficient.

Answer 2

[rantunes]

Hey,

You can also use another (more mathematical) approach:

x = [1;2;3;4;5];
y = 0;
for i = 1:length(x)
    y = y + (10^(i-1))*x(length(x)+1-i);
end

Greets

[rantunes]

sorry for the one line copy-paste ;)

[Guillaume]

Fixed the formatting for you.

Your code is what polyval does.