don't color body

Hi, i used chat gpt to create this code..i want to plot candlestick (trading) but i can't to color body

function BIAS_plotLastCandles6_test(grouped, n, bodyWidth, ax)
% BIAS_plotLastCandles2 - ultime n candele con body verdi/rossi
% 
%   grouped   : struct con campi Open, High, Low, Close, Time
%   n         : numero di candele da mostrare (dalle più recenti)
%   bodyWidth : (opzionale) larghezza corpo candela (default = 0.6)
%   ax        : (opzionale) handle assi (es. app.UIAxes).
%               Se omesso, crea nuova figura.

    if nargin < 3 || isempty(bodyWidth), bodyWidth = 0.6; end
    if nargin < 4 || isempty(ax)
        f = figure('Renderer','opengl');
        ax = axes('Parent', f);
    end
    hold(ax, 'on');

    %%****************
    f = figure('Renderer','opengl');
    ax = axes('Parent',f); hold(ax,'on');

    %%*********************

    % --- estrazione ultime n righe
    N  = numel(grouped.Close);
    n  = min(n, N);
    idx = N-n+1:N;

    O = grouped.Open(idx);
    H = grouped.High(idx);
    L = grouped.Low(idx);
    C = grouped.Close(idx);
    T = grouped.Time(idx);

    % spessore minimo per doji
    rangeHL = max(H) - min(L);
    minH = max(eps, rangeHL * 0.005);

    % --- wick neri
    for i = 1:n
        line(ax, [i i], [L(i) H(i)], 'Color', 'k');

        y0 = min(O(i), C(i));
        y1 = max(O(i), C(i));
        h  = y1 - y0;
        if h <= 0
            h  = minH; 
            y0 = y0 - h/2;
        end

        if C(i) >= O(i)
            col = [0 1 0];   % verde pieno
        else
            col = [1 0 0];   % rosso pieno
        end

        patch(ax, ...
            [i-bodyWidth/2 i+bodyWidth/2 i+bodyWidth/2 i-bodyWidth/2], ...
            [y0 y0 y0+h y0+h], ...
            col, 'EdgeColor','k');
    end

    % --- asse X con date leggibili
    if n > 1
        step = max(1, round(n/10));
        xticks(ax, 1:step:n);
        xticklabels(ax, cellstr(datestr(T(1:step:end))));
    else
        xticks(ax, 1);
        xticklabels(ax, cellstr(datestr(T)));
    end
    xlabel(ax, 'Time'); ylabel(ax, 'Price');
    title(ax, sprintf('Ultime %d sessioni', n));
    box(ax, 'on'); grid(ax, 'on');
    xlim(ax, [0, n+1]);
end

[Matt J]

Please run it for us so that we can see what the code does and does not do.

[dpb]

And then tell us explicitly what is/isn't what you were expecting/wanting.

[shamal]

problem solved...if I enlarge the graph I see the colors