how to create histogram for each value of a matrix

Question

adi 2020-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/525185-how-to-create-histogram-for-each-value-of-a-matrix

评论： adi 2020-5-14

Hi all,

I have a 300X332 double matrix and i need to have an histogram of each value from the matrix in precentage. i'll explain by a simple example:

assume i have M=[1,1,2,3; 0,4,2,2; 1,1,1,1] iwant to have an histogram that will tell me how many times i have each value of the matrix out of all matrix veriables in precentage. for example the value of 1 will have a bin with height of 50%.

i used histogram func and can get only bins that are wider than only one value - bins of value 1 between 2 then 3 between 4 and so on..

later i need to extract the matrix values that correspond to 80%-90% of the whole matrix

how can i do it?

thanks

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Answer 1

Ruger28 2020-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/525185-how-to-create-histogram-for-each-value-of-a-matrix#answer_432268

编辑：Ruger28 2020-5-13

在 MATLAB Online 中打开

M=[1,1,2,3; 0,4,2,2; 1,1,1,1];
N = M(:);                           % make into vector
[SortedMat,I] = sort(N);            % sort data
[UnVals,uIDX] = unique(SortedMat);  % get unique values
P = histcounts(SortedMat);          % get number of times the number appears
num_of_elems = numel(M);            % get total number of values in matrix
PercentVals = P / num_of_elems;     % divide to get percent of matrix
bar(UnVals,PercentVals);            % plot
xlabel('Values');
ylabel('Percentage [%]');

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adi 2020-5-14

workspace.JPG

hi, i tried your code, but when i imply my code it doesnt work, p after the histcounts isnt the same length as UnVals. I did exactly the same as you did,just replaced M by Gmag of size 137X367.

i attached an image of my workspace.

what is wrong?

thank you!!

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