Reagarding non linear optimization problem

To solve a optimization problem with non linear and mixed integer constraint optimization tool is showing me to use population type double type vector. What is this double type vector and why i am no able to use use bit string? For Mixed integer, non linear, non quadratic programming which population type should i use in optimization tool. please reply. Thanking you in advance.

[Rik]

A double is double precision floating point value, which means that two bytes are used to describe one value. It is the standard data type in Matlab. Why not try out if converting your string to numeric 0 and 1 works?

[Parikshit Sharma]

No its not working. Is double type vector and real coded Genetic algorithm same?

[Rik]

It is not entirely clear to me what it is you are trying to do, nor what your exact problem is. Have you followed the suggestions from here?

[Brendan Hamm]

As a correction to the above, double precision uses 8-bytes or 64-bits to store a single value. It is the standard NUMERIC data type in MATLAB. A bit-string is not actually a string (or char), it is a constraint in the Genetic Algorithms for the population type to force the value to be 0 or 1, but it will still be a numeric double.

You cannot use the bitstring with a constrained problem: https://www.mathworks.com/help/gads/genetic-algorithm-options.html#f14223

There are ways however to write your own population creation, mutation and crossover functions to achieve this goal. If you would be so kind as to elaborate on the specific problem, I would be happy to help solve this.