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# How to verify each position equality?

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Biza Ferreira on 20 Jun 2014
Closed: MATLAB Answer Bot on 20 Aug 2021
if true
% code
clc;
clear all;
close all;
vector=A(:); %converte a matriz em um vector
C=unique(vector')%torna os valores da matriz unicos , sem repticao
dimentionA = length(vector)%contagem da dimencao do vector de todos os valores da matriz
dimentionC = length(C);%contagem dos valores da matriz que sao distintos
count =0; % contagem iniciada em zero
for (i=1:dimentionC) %matriz de dimensao de valores nao repetidos
for (j=1:dimentionA)%matriz de dimensaos de todos os valores
end
end
%code
end
I have write this code, i have one image and i convert the image matrix in one vector(C), and create a new vector(C) with non repeated values, now I want cont in the original matrix how many times the same value, of the value position in the new vector(V) repeat and index him by the position who was read in the new vector(C)

Image Analyst on 20 Jun 2014
Just call imhist().
[pixelCounts, grayLevels] = imhist(grayImage);
If you really need (row, column) location for a particular gray level then you can do
[rows, columns] = find(grayImage == theGrayLevelYouWant);