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

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

Akzeptierte Antwort

Ayush
Ayush am 17 Jul. 2024
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:
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
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;
  4 Kommentare
albert Kinda
albert Kinda am 21 Jul. 2024
Hi, how to have different markers for each i in order to differentiate them?

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Weitere Antworten (2)

Shantanu Dixit
Shantanu Dixit am 17 Jul. 2024
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:
  1. https://www.mathworks.com/help/matlab/ref/plot.html
  2. https://www.mathworks.com/help/matlab/ref/colormap.html

Rahul
Rahul am 17 Jul. 2024
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;
You can refer to this link for more information regarding 'hold' function: https://www.mathworks.com/help/releases/R2024a/matlab/ref/hold.html?searchHighlight=hold&s_tid=doc_srchtitle
Hope this helps!

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