how to plot graph

Question

aditya sahu 2017-6-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345117-how-to-plot-graph

回答： dpb 2017-6-17

suppose i have a matrix of 512*256 elements ranging from -200 to 200. I need to plot a graph, where the x-axis is the elements of the matrix and y-axis is the frequency(i.e no. of time the value presents in the matrix) of each matrix. Kindly suggests me.

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Answer 1

dpb 2017-6-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345117-how-to-plot-graph#answer_270997

在 MATLAB Online 中打开

u=[-200:200].';                        % presume all elements are present
histogram(A(:),[u-0.5;u(end)+0.5])     % histogram with bin centered at integer elements
xlim([-210 210])                       % even up white space each end
set(gca,'xtick',u(1):40:u(end))        % not enough room for very many ticks

presuming the values are integers as illustrated.