Function 'boundary' not supported for code generation. How to solve this?

Function boundary(), which is used to get the boundary of a set of points, does not support code generation. When I use coder to generate C++ code, error occurs. How to solve this problem?

[Chuguang Pan]

max and min fucntions may be helpful.

Answer 1

[Mathieu NOE]

hello

based on code seen here :

https://fr.mathworks.com/matlabcentral/answers/299796-tight-boundary-around-a-set-of-points

you can try this as an alternative to boundary :

function [x_out,y_out] = tight_boundary(x,y)

%https://fr.mathworks.com/matlabcentral/answers/299796-tight-boundary-around-a-set-of-points


    %split data into classes and find max/min for each class
    class_label = unique(x);
    upper_boundary = zeros(size(class_label));
    lower_boundary = zeros(size(class_label));
    for idx = 1:numel(class_label)
        class = y(x == class_label(idx));
        upper_boundary(idx) = max(class);
        lower_boundary(idx) = min(class);
    end

    left_boundary = y(x == class_label(1));
    right_boundary = y(x == class_label(end));

    % left_boundary
    x1 = class_label(1)*ones(size(left_boundary));
    y1 = left_boundary;

    % right_boundary
    x2 = class_label(end)*ones(size(right_boundary));
    y2 = right_boundary;

    % top boundary
    x3 = class_label;
    y3 = upper_boundary;

    % bottom boundary
    x4 = class_label;
    y4 = lower_boundary;

    x_out = [x1(:);x2(:);x3(:);x4(:);];
    y_out = [y1(:);y2(:);y3(:);y4(:);];

end