Writing a loop for structure array

Hello folks, I'm a newbie for matlab....got a seemingly easy question, I'd be really appreciated if someone can help.

So I wanna create structure array named "harvest".

Total sample number of "harvest" is 768, and each sample is subdivided into 4 categories(.shanghai/.fortune/.spinach/.lettuce).

The number in each cell is random integer between 0~10. However, under each category, the sum of that category has to <=4608.

The story behind is to simulate the 4 different vegetables' daily harvest for all the 768 households. Each vegetable's daily harvest cannot excess 4608.

I try to put in the code:

 n=1:768;
 harvest(n).shanghai=randi([0,10],1);
 harvest(n).fortune=randi([0,10],1);
 harvest(n).spinach=randi([0,10],1);
 harvest(n).lettuce=randi([0,10],1);
 sshanghai=sum(harvest(n).shanghai);
 sfortune=sum(harvest(n).fortune);
 sspinach=sum(harvest(n).spinach);
 slettuce=sum(harvest(n).lettuce);
 sshanghai,sfortune,sspinach,slettuce <= 4608

And it's not working....this is not a loop though...do you think I need to write a loop? And how to?

Many thanks!

Answer 1

[Walter Roberson]

You can use structfun()

But first you need to define what should happen if the total would otherwise exceed 4608.

[sushi]

the prerequisite is that it can't exceed 4608, so it'd be random numbers with the sum of each category not exceeding 4608. Is that possible?

[Walter Roberson]

while true
  harv = randi([0 10], 768, 4);
  if sum(harv(:)) <= 4608; break; end
end

Now write the values in harv into your structure.