Loop and write into a cell

Hello, i wanna accumulate the data in my script with a loop

l=[1,2,3,4,5,6,7,8,9,10]
S=[42600 35000 91850 20000 41060 30000 63100 10000 38500 30000]';
P=[65 840 50 176 48 638 14 130 32 45]';
X=S .* P;
sort(X,'descend');
a=sum(X);
p=cell(10,1);
c=cell(10,1);

for k=1:10
    p{k}= (X(k)/a)*100
end

for k=1:10
c{k}=sum(p(1:,k) 1))
end

In this loop i wanna accumulate my data p and write it to the cell c.

for k=1:10
c{k}=sum(p(1:,k) 1))
end

But i get the error:

c{k}=sum(p(1:,k) 1))

↑

Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched

delimiters.

What is wrong here?

Answer 1

[ME]

This part of your code:

for k=1:10
c{k}=sum(p(1:,k) 1))
end

has two open (left) brackets and three close (right) brackets - so you have mismatched delimiters as suggested in your error message.

[Mark F]

I have tried this but i get the same error:

for k=1:10
c{k}=sum(p(1:,k) 1)
end

[ME]

I think you also need a comma before the 1. The correct syntax is: sum(A,dim)

[Mark F]

Ok, i have tried this:

for k=1:10
c{k}=sum(p,1)
end

But know i have this error:

Error using sum

Invalid data type. First argument must be numeric or logical.

p is in my script a cell.

[ME]

I’m not sure but then you probably need to swap to:

for k=1:10
c{k}=sum(p{1:,k}, 1)
end

[ME]

You might just need to be careful with the data type of p. If you use ‘class()’ then you can check what data type your p commands are. You can then look up the Matlab documentation online for the acceptable classes for the sum command.