How do I put this formula int matlab?

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Arda Nova
Arda Nova 2019-3-22
回答： madhan ravi 2019-3-22
z=imread('C:\Users\*****\Desktop\Matlab\Homework 3-02 03 04 05\Fig308a.jpg');
for i=1:255
y(i)=sum(z(:) == i);
end
n=488*373;
for j=1:255
s(j)=symsum(y(k)/n, k, 1, j); %% Talking about this part.
end
bar(y), figure, imhist(z), figure, bar(s)
Long story short, what I want to get is such that:
s(1)=y(1)/n
s(2)=y(1)/n+y(2)/n
...
I get the error saying:
"Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments
must be symbolic variables, and function body must be sym expression."
Ekran Alıntısı.PNGOriginial formula.
What should i use?
  2 个评论
madhan ravi
madhan ravi 2019-3-22
编辑：madhan ravi 2019-3-22
I am not able to interpret your formula but if the concept is this
s(1)=y(1)/n
s(2)=y(1)/n+y(2)/n
... then why not
cumsum(y/n) % ?
[comment moved to answer section]
Arda Nova
Arda Nova 2019-3-22
Exactly what I am searching for. I tried to search summation types on matlab but couldn't come to this title. Thank you very much.

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madhan ravi
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