加快環形八度繪圖功能

Question

我已經寫了一個簡單的八度繪圖功能，下面的代碼，但不幸的是需要一些時間來繪圖。有什麼方法可以加快速度？

function hilo_conditional_plot(high , low , condition) 
%HILO_CONDITIONAL_PLOT 
% Takes high, low and condition input vectors and plots a line chart of highs 
% and lows coloured according to the condtion. For this basic version there 
% are only 3 conditons; 1 for long, -1 for short and 0 for neutral; with the 
% respective plot colours being blue, red and green. 

date = (1 : length(high))' ; 
hold on ; 

for ii = 1 : length(high) 

    if condition(ii) == 1 
    line([ date(ii) date(ii) ] , [ low(ii) high(ii) ] , 'Color' , 'b' , 'linewidth' , 2) ; 
    elseif condition(ii) == -1 
    line([ date(ii) date(ii) ] , [ low(ii) high(ii) ] , 'Color' , 'r' , 'linewidth' , 2) ; 
    elseif condition == 0 
    line([ date(ii) date(ii) ] , [ low(ii) high(ii) ] , 'Color' , 'g' , 'linewidth' , 2) ; 
    else 
    printf('Error in condition vector - a value != 1,-1 or 0') ; 
    end 

end 

grid minor on ; 

hold off ; 

編輯：高和低列將包含數值財務數據和條件列將包含一個1，-1或0的值，E，G。

1.2 1.1 0 
1.3 1.1 1 
1.4 0.9 -1 

Answer 1

僅環比條件：

close all 

num = 40; 
date = linspace (0, 4 * pi, num); 
condition = randi (3, 1, num) - 2; 
low = sin (date) - 0.3 * rand (1, num); 
high = sin (date) + 0.5 * rand (1, num); 

for k = 1:3 
    idx = condition == k - 2; 
    c = {"r","g","b"}{k}; 
    line ([date(idx);date(idx)], [low(idx);high(idx)], "color", c, "linewidth", 2) 
endfor 

grid