## Counter in double loop with counting in both internal and external for

I would like to know if there is a well-known formula for the following way of counting:

count = 0 for i in range(n): for j in range(m): count = count + 1 count = count + 10

Many thanks in advance,

Cayo

EDIT 1:

Thanks Ernest, you are right, but that is not really the problem. Sorry, I was not clear enough, let me explain better my problem. I don't just want to count, I need use this counter inside the inner loop. I have a 2D flatten array and I want to access just a sub-2D-region of this array. So, actually, what I am doing is:

count = 0 for i in range(n): for j in range(m): big_flatten_array(count) = value count = count + 1 count = count + 10

EDIT 2: It doesn't work just using

count = i * 10 + j

Try checking the values:

count = 0 for i in range(3): for j in range(): k = i * 2 + j vec[k] = count vec2[k] = i * 10 + j count = count + 1 count = count + 10

And you will see the vec and vec2 are not the same...

Let's consider that the line `count = count + 10`

didn't exist, then it would simply be:

count = i*m + j

Consider n = 3, and m = 3
So the count values are like 0, 1, 2, 3, 4 ..
once you add the line `count += 10`

, you're simply adding multiples of 10 to the count value each time the outer loop finishes.

0, 1, 12, 13, 24, 25... or 0, 1, 10 + 2, 10 + 3, 20 + 4, 20 + 5...

so the expression becomes

count = (10*i) + (i*m+j)

And you can get all the count values like so:

count = [(10 * i) + (i * m + j) for i in range(n) for j in range(m)]

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There is really simple solution

count = n*(10+m)

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Let me try. If I understand correctly you just need current (not final) value of `count`

inside the loop. So this should do:

# In the inner loop count = i * 10 + j

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**Chapter 5: Nested loops, Which loop to use?,** The inner loop is nested inside the outer loop. Sample nested loop code For example, you read a file line by line and for each line you must count how many� If the condition is initially false, the body of the loop will not be evaluated at all. Counting Loops. Although every while loop has the same general form, while loops can be used to serve a variety of different purposes. A common form of loop is the counting loop, in which the loop repeats a fixed number of times.

foreach is a loop which iterates through a collection or array one by one, starting from 0 index till the last item of the collection. So, if I have n items in an array. foreach (var item in arr) { }

##### Comments

- what you want to achieve? give example
- Please feel free to add more details about your problem : what is the goal of this algorithm ? What is the context ?
- This is the actual correct answer. Best would be to also show how you deduced it.