Make a plot using value from a certain line of matrix

Question

Huichen Zhang 2016-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/306349-make-a-plot-using-value-from-a-certain-line-of-matrix

评论： dpb 2016-10-8

Suppose I have a matrix of dimension 10x10. Now I want to use the value along the column 5 as Y axis, and use the index of rows to represent x increment, how can I make a plot like that in Matlab? And at the same time, when I do the contour plot of a matrix, is it a way to indicate the highest and lowest value in the contour plot?

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Answer 1

Massimo Zanetti 2016-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/306349-make-a-plot-using-value-from-a-certain-line-of-matrix#answer_238098

编辑：Massimo Zanetti 2016-10-8

在 MATLAB Online 中打开

Herre it is:

%define a 10x10 matrix 
A=rand(10,10);
%plot its 5th column with index as x axis
plot(A(5,:));
%detect min and max
[minv,imin]=min(A(5,:));
[maxv,imax]=max(A(5,:));
%add them to plot
hold on;
plot(imin,minv,'*',imax,maxv,'d');
legend('line','min','max')
hold off;