MATLAB: How to merge vector elements into a single number of type double

scalarvector

Hello,

How can I transform this vector:

v=[1 2 3]

into this scalar of type double?:

k=123

Thank you,

Lazaros.

Best Answer

k = polyval(v, 10)

is probably the easiest.

This assume of course that each element of v is an integer in the range [0-9].

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Hi Riccardo,

Converting to strings seems inefficient to me (and it not required for this problem either).

Here is an alternative way to get the output:

% I assume all elements in the vector are b/w '0' and 'n-1' inclusive.
N=5;
vec = [1 4 3 1]   % In base 5, this is 241.
% now for the solution.
powN = (length(vec)-1): -1: 0;        % output: powN = 3 2 1 0  (powers of N for each digit)
powN = N.^powN;                       % output: powN = 125 25 5 1  (place value of each digit for base 5)
ans = vec*(powN');                    % output: ans = 241

Explanation: Generate powers of N in a vector and then dot multiply this to get your answer.

You can combine these statements if you wish to speed up your code. Try:

ans = vec*(N.^((length(vec)-1:-1:0)'));

Hope it Helps!

MATLAB: Concatenate column values in a vector

Simpler way:

v=[1,0,1,0];
result=str2num(sprintf('%1d',v))

here the same question Credit: @per isakson

Result:

result =
        1010
>>

Best Answer

Related Solutions

MATLAB: Enumeration of all possible samples with replacement trough base conversion

MATLAB: Concatenate column values in a vector

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