Find maximum in graphic

Question

Miguel Albuquerque 2022-7-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1752120-find-maximum-in-graphic

回答： Mathieu NOE 2022-7-4

采纳的回答： Mathieu NOE

在 MATLAB Online 中打开

Hey guys thanks in advance;

I have this code that represents a signal in time domain:

figure;
maxcolorbar=max(max(20*log10(abs(range_compressed_matrix))));
imagesc(1:400,time_compression_cut*c,abs(range_compressed_matrix));
colorbar;
colormap(jet);
%caxis([maxcolorbar-20 maxcolorbar]);
title('Range Compressed Data');
xlabel('Waypoints (m)');
ylabel('Range (m)');
xlim([0 400]);

And I get this figure:

I want to know the mamixum os this figure, I can see its in the red lines, however I dont know which is higher and for what range and waypoint that value is.

Thanks a lot

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Answer 1

Mathieu NOE 2022-7-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1752120-find-maximum-in-graphic#answer_999485

在 MATLAB Online 中打开

hello

following this example :

A = [1 2 3; 4 5 6]
[M,ind] = max(A,[],'all','linear') % max value of matrix 
[row,col] = ind2sub(size(A),ind) ; % Convert linear indices to subscripts

applied to your code : the result appears in x_max and y_max

still I wonder why you compute the max of the log of the data but you display them in linear range

figure;
A = 20*log10(abs(range_compressed_matrix));
[maxcolorbar,ind] = max(A,[],'all','linear'); % max value of matrix 
[row,col] = ind2sub(size(A),ind); ; % Convert linear indices to subscripts
xx = 1:400;
yy = time_compression_cut*c;
x_max = xx(row);
y_max = yy(col);
imagesc(xx,yy,abs(range_compressed_matrix));
colorbar;
colormap(jet);
%caxis([maxcolorbar-20 maxcolorbar]);
title('Range Compressed Data');
xlabel('Waypoints (m)');
ylabel('Range (m)');
xlim([0 400]);