Python randomnumber array

Question

So, i have a small issue witch creating random numbers for an 2d array in python.

I have a matrix looking like this

matrix:
       row = ['.' for i in range(w)]
        self.matrix = [row]
        for j in range(h - 1):
            row = ['.' for i in range(w)]
            self.matrix.append(row)

w = int(input("please insert the width of the array: "))
h = int(input("please insert the height of the array: "))

user = int(input("please insert a number for objects: "))

x = random.sample(range(w), user)
y = random.sample(range(h), user)

list(zip(x, y))

So, now i want to create so many random numbers as user input. For example, it the user inputs 100, i need 100 numbers from x and y, so that i can use them as position, to insert objects randomly into the array.

But if the width and height are smaller then userinput i get an error.

This here "in sample raise ValueError("Sample larger than population")" — PythonUserNew
– PythonUserNew, Commented Dec 17, 2015 at 13:06
Your user value is greater than len(range(w)) (or len(range(h))) — JCVanHamme
– JCVanHamme, Commented Dec 17, 2015 at 13:08
Yeah, but is there a way to overcome this, i have tried with other random possibilities, but haven't come to a solution. — PythonUserNew
– PythonUserNew, Commented Dec 17, 2015 at 13:10
Calling random.sample twice independently doesn't make a lot of sense to me. That means that all of the points you choose from the grid will have completely unique x coordinates and y coordinates - for example, you'll never end up with both (0,0) and (0,1). If you want actually random coords, you need to create a single list of all coordinates and call sample on that list just once. — Kevin
– Kevin, Commented Dec 17, 2015 at 13:12

dd23 · Accepted Answer · 2015-12-17 13:22:12Z

2

Using the following two lines for x and yshould give you the results you expect:

x = [random.randint(0, w-1) for c in range(user)]
y = [random.randint(0, h-1) for c in range(user)]

answered Dec 17, 2015 at 13:22

dd23

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1 Comment

PythonUserNew Over a year ago

yes, that did work, thanks so much, it helps me alot!

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