# Creating data set for location Problem

Asked by Varun Jain on 30 May 2012
Latest activity Commented on by Walter Roberson on 30 May 2012

I want to create an array of 150*150. filled with randomly generated, 15 cells for Distribution center i(1 to 15) and 50 cells for customer j (1 to 50). Then i want to calculate euclidean distance for each customer from each distribution center. Is there any function for creating the mentioned array of 150*150. Any help will be appreciated as I am totally new to this MATLAB world. Thanks!!!

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## 1 Answer

Answer by Walter Roberson on 30 May 2012
```centers = -(1:15);    %flag them with negative
customers = 1:50;  %let them be positive
numzero = 150 * 150 - length(centers) - length(customers);   %# empty places
to_scramble = [centers, customers, zeros(1,numzero));
neworder = randperm(length(to_scramble));
scrambled = to_scramble(neworder);
filledmatrix = reshape(scrambled, [150, 150]);
```

If you really needed a built-in routine to do this, you could construct everything up to to_scramble and then use a routine from the stats toolbox to do sampling without replacement with to_scramble as the population space, and then you would reshape() that result. Hardly seems worthwhile, considering you could combine

```scrambled = to_scramble(randperm(length(to_scramble)));
```

and not have the overhead of the stats routine.

## 2 Comments

Varun Jain on 30 May 2012

Thanks for the code sir!!
Any suggestion how to find euclidean distance between centers and each customer?

Walter Roberson on 30 May 2012

Give the coding a try and see what _you_ can do on your assignment.

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