How to plot for different parameter values of a, p1 and p2

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vetri veeran 2015-10-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/249734-how-to-plot-for-different-parameter-values-of-a-p1-and-p2

评论： Image Analyst 2015-10-21

Hi all, I want to plot using different parameter values of a, p1 and p2 in the same plot in the following code. Like a = 1,2,3 , p1= 1,2,3 and p2= 1,2,3.

My code:

a = 1;
p1=1;
p2=1;
r1 = 1/2.*log2(1+(p1/(a+ p2)));
r2 = 1/2.*log2(1+(p2/(a)));
plot([0 r1],[r2 r2]);
hold on;
plot([r1 r2],[r2 r1]);
plot([r2 r2],[r1 0]);

Thanks

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TastyPastry 2015-10-20

Can you be more specific as to what you're trying to plot on each axis? Currently your code plots 3 lines on the same plot. Are you trying to shorten your code?

vetri veeran 2015-10-21

编辑：vetri veeran 2015-10-21

I want to plot r1 and r2 on x and y axis respectively. Also, I need to compare the difference of r1 and r2 plot by using different values of a, p1 and p2.

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Answer 1

Image Analyst 2015-10-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/249734-how-to-plot-for-different-parameter-values-of-a-p1-and-p2#answer_196788

在 MATLAB Online 中打开

Try this:

% Define variables.
a = [1,2,3];
p1 = [1,2,3];
p2 = [1,2,3];
for index = 1 : length(p1)
  subplot(2, 2, index);
  r1 = 1/2. * log2(1+(p1(index) / (a(index)+ p2(index))));
  r2 = 1/2 .* log2(1+(p2(index) / (a(index))));
  fprintf('For index = %d, a=%d, p1 = %d, p2 = %d, r1 = %f, r2 = %f\n', ...
    index, a(index), p1(index), p2(index), r1, r2);
  plot([0 r1],[r2 r2], 'b*-', 'LineWidth', 3, 'MarkerSize', 15);
  hold on;
  plot([r1 r2],[r2 r1], 'b*-', 'LineWidth', 3, 'MarkerSize', 15);
  plot([r2 r2],[r1 0], 'b*-', 'LineWidth', 3, 'MarkerSize', 15);
  grid on;
  caption = sprintf('a=%d, p1 = %d, p2 = %d', a(index), p1(index), p2(index));
  title(caption, 'FontSize', 20);
  xlabel('X', 'FontSize', 20);
  ylabel('Y', 'FontSize', 20);
end
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')

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vetri veeran 2015-10-21

编辑：vetri veeran 2015-10-21

Thank you for reply. Could you please tell me, How do I plot a=1,2,3 p1=1,2,3 and p2=1,2,3 in only one plot(X and Y) so that I can easily compare all the parameters of a, p1 ,p2.