Receive Error using / Arguments must be numeric, char, or logical when I am using histogram

I am working on dicom file. I Get Error using / Arguments must be numeric, char, or logical error when histogram lines are working. Help me please

(h1 = histogram(a, 64)/n;

h2 = histogram(b,64)/n;)

[Org, map1] = dicomread("ad-talarich\a4\ADNI_131_S_0497_PT_Talairach_Warped_Br_20080307132607768_3_S15907_I95832.dcm")

[Ref, map2] = dicomread('cn-talararich\a97\ADNI_005_S_0610_PT_Talairach_Warped_Br_20080306090318595_2_S17355_I95406.dcm')

a = double(Org);

b = double(Ref);

%a = Org(:);

%b = Ref(:);

n = length(a);

H = zeros(25600,25600);

for i = 1:n

x = a(i);

y = b(i);

H(x+1,y+1) = H(x+1,y+1) + 1 ;

end

h1 = histogram(a, 64)/n;

h2 = histogram(b,64)/n;

s = zeros(32768,32768);

H = H/n;

for i = 1: 64

for j = 1:128

if H(i,j) == 0 || h1(i) == 0 || h2(j) == 0

s(i,j) = 0;

else

s(i,j)= H(i,j)*log2(H(i,j)/(h1(i)*h2(j)));

end

end

end

Answer 1

[Dave B]

histogram returns a graphics object, so when you try to divide that by n you'll get an error.

If you're looking for the values in the histogram, try the histcounts function:

n=5;
histcounts(rand(100,1))/n

ans = 1×5

3.0000 5.0000 4.6000 3.8000 3.6000

If you want to deivide the values before making the histogram, just slip the /n into the parentheses:

histogram(rand(100,1)/n)

[Ceren yüksel]

many thanks it works