Multiple Summation in matlab

Hi, I want to do muliple summation in matlab for attached formula. Can you please guide me how to write matlab code for that.

Regards, Imran

[Walter Roberson]

Does the term

Pc
  ij

mean something different than

P * c
     ij

Or is P a function or is Pc a single variable that is being subscripted?

The formula uses an explicit "*" before the x so it is not clear whether it is being inconsistent with its notation.

I am trying to figure out why it was not written as

Sigma Sigma Pc_ij Sigma x_ijs

since the part before the "*" is invarient in s. And if there is an implicit multiplication between P and c_ij then why was it not written as

P Sigma Sigma c_ij Sigma x_ijs

?

[imran]

Hi Walter,

I have attached the image with notation details and parameters. I hope it clarifies. PC is a single variable called production cost for part 'i' in plant 'j'. It is mutiplied by x_ijs which is Quantity x of part i produced in plant j ready to be moved to subassembly s.

Answer 1

[Guillaume]

Assuming Pc is an IxJ matrix and x an IxJxS matrix, then the sum is simply:

sum(sum(sum(bsxfun(@times, Pc, x))))

edit: managed to mispell |bsxfun|!