How to plot different colors (scatter or line) depending on (i+1<i) or (i+1>i) condition ?

Question

C.PR 2024-1-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/2076116-how-to-plot-different-colors-scatter-or-line-depending-on-i-1-i-or-i-1-i-condition

评论： C.PR 2024-1-30

采纳的回答： Anjaneyulu Bairi

在 MATLAB Online 中打开

Dear All,

I have a problem for which I don't know where to start :/

Let's say I have this

x=0:10;

y = sin(x);

I would like to have two different color for y, depending on the following condition :

if the curve is increasing = plot in red (so not just superior to a random number but superior to the previous number)
if the curve is decreased = plot in blue

I can imagine it would be something like :

for x=0:10
    y = sin(x);
end
      
    if sin(i+1)>sin(i) 
         plot(x, y, 'r') 
    elseif sin(i+1)>sint(i) 
          plot(x, y, 'b')
end

I think I understood what to do, but I have no idea where to start and how to write this correctly ..

If someone has ever done this ?

Thanks a lot

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Answer 1

Anjaneyulu Bairi 2024-1-30

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2076116-how-to-plot-different-colors-scatter-or-line-depending-on-i-1-i-or-i-1-i-condition#answer_1399641

在 MATLAB Online 中打开

Hi,

To plot the curve with different colors depending on whether the curve is increasing or decreasing, we can use the output value of the function.

Code for reference

x = 0:0.1:10; % To get a smoother curve
y = sin(x);
figure;
hold on;
for i = 2:length(x)
    if y(i) > y(i-1)
        % Curve is increasing, plot in red
        plot(x(i-1:i), y(i-1:i), 'r');
    else
        % Curve is decreasing, plot in blue
        plot(x(i-1:i), y(i-1:i), 'b');
    end
end
xlabel('x');
ylabel('sin(x)');
title('Curve Increasing (Red) and Decreasing (Blue) Segments');
hold off;