how to plot a matrix graph of D(n,m) versus C(n,m) with different colors

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albert Kinda 2024-7-17，9:35

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评论： albert Kinda 2024-7-21，11:48

采纳的回答： Ayush

Test.m

I would like to plot a graph of D versus C. For each i have a different color

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Answer 1

Ayush 2024-7-17，10:01

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Hi @albert Kinda,

You can leverage the "Color" attribute of the "plot" function with a for loop to iterate over each i to plot a graph of D versus C with different colors. You can refer to the following documentation to know more about the "Color" Name-Value argument:

https://www.mathworks.com/help/matlab/ref/plot.html#btzitot-Color

Here is an example code as well for additional reference built-on top of your code:

clc;

clear all;

close all;

C = zeros(12, 49);

D = zeros(12, 49);

for i = 1:12

for j = 1:49

C(i, j) = i * j;

D(i, j) = i - j;

end

% Define colors for each 'i'

colors = lines(12); % Using the 'lines' colormap for 12 different colors

% Plot D versus C with different colors for each 'i'

figure;

hold on;

for i = 1:12

plot(D(i, :), C(i, :), 'Color', colors(i, :), 'DisplayName', ['i = ' num2str(i)]);

end

hold off;

xlabel('D');

ylabel('C');

title('Plot of D versus C');

legend('show');

grid on;

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albert Kinda 2024-7-17，12:45

Thanks for help

albert Kinda 2024-7-21，11:48

Hi, how to have different markers for each i in order to differentiate them?

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Answer 2

Shantanu Dixit 2024-7-17，10:23

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Hi Albert,

It is my understanding that you want to plot the two matrix values against each other and have different colors corresponding to each row in the plots.

You can use ‘plot(X,Y,LineSpec)’ from ‘plot’ functionality in MATLAB.

plot(X,Y,LineSpec) creates the plot using the specified line style, marker, and color.

X cand Y point to the corresponding rows from D and C respectively. Colors can be defined using ‘colormap’ as a 12X3 matrix and be passed as LineSpec to the ‘plot’ function.

Additionally, you can refer to the following MathWorks documentation link for better understanding on plotting and colormap:

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albert Kinda 2024-7-17，13:55

Thanks for help and suggestions

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Answer 3

Rahul 2024-7-17，10:30

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Hi @albert Kinda

I was able to use the code you provided to obtain the plot figure. The following changes can help you get the desired plot:

Firstly, I defined a colormap using the 'lines' function.
Further, I made the use of 'hold on' and 'hold off' in the loop while plotting to obtain all points in the same plot.

colors = lines(12);
hold on;
for i=1:1:12
    for j=1:1:49
        plot(D(i,j), C(i,j), '.', 'Color', colors(i, :)); % Use different color for each i
    end
end
hold off;