MATLAB: Error “The expression to the left of the equals sign is not a valid target for an assignment.”

error

I run a test program shown below:
clear all;
clc;
image_a = imread('doll_full_color','png');
histo = histogram(image_a);
error comes:
??? Error: File: histogram.m Line: 12 Column: 30
The expression to the left of the equals sign is not a valid target for an assignment.
Error in ==> test_his at 5
histo = histogram(image_a);
For your information, histogram is a function I defined to calcuate the histogram of an image,shown below:
function [ histo ] = histogram( image )
%UNTITLED3 Summary of this function goes here
%   Detailed explanation goes here
clc;
[row, column] = size(image,3);
histo = zeros(256,3);
histo_sum = zeros(256,3);
for m=1:1:3
for i=0:1:255
    for j=1:1:row
        for k=1:1:column
            if( image(j,k,m) = i)
                histo_sum(i,m) = histo_sum(i,m) +1;
            end
        end
    end
end
end
histo = histo_sum/(row*column);
end
Anyone can help solve the problem? Thank you!

Best Answer

The comparison operator is ==
if( image(j,k,m) == i)
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