Adding the last position of an array to the same array

Question

In matlab one can do

for i = 2:10
 array(i) = array(i-1) + value
end

How can I replicate this in python?

I'm not very good at matlab, what is value here? Is it the old value of array(i)? — Expurple
– Expurple, Commented Dec 31, 2021 at 12:08
That's just a random value that we want to add to the array in each cycle.! I also don't understand this quite well. I was sent a Matlab script with this on it. Furthermore, I am trying to decipher it and implement it in python. I believe that this is similar to the array += value where you have something like k=k+1 — Pedro Brandão
– Pedro Brandão, Commented Dec 31, 2021 at 12:40
MATLAB can grow a matrix by simply assigning new indices. With numpy you need to initial the array to fill size first. But we need more context to come up with a good numpy or python solution. For example np.cumsum([value1,value2, value3...]). — hpaulj
– hpaulj, Commented Dec 31, 2021 at 17:51
Check out Manlais answer, stackoverflow.com/a/70560707/7031021 — RSale
– RSale, Commented Jan 3, 2022 at 1:06

Maciej Czarnecki · Accepted Answer · 2021-12-31 12:52:29Z

4

In python it will be:

for i in range(1,10):
   array[i] = array[i-1] + value

Keep in mind that in python, indexing starts from 0.

edited Dec 31, 2021 at 12:52

answered Dec 31, 2021 at 12:40

Maciej Czarnecki

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2 Comments

Expurple Over a year ago

Why 9? If I understand correctly, matlab's 10 is inclusive, but range isn't, so you need 10 here to stop after index 9 (the 10th 0-indexed element)

Maciej Czarnecki Over a year ago

@Expurple, You're right! Thank You for spotting it. Already fixed.

Reza Tanakizadeh · Accepted Answer · 2021-12-31 13:46:02Z

0

You can do something like this in python:

But you should also pay attention to one point: That the number of indexes in Python starts from zero while in MATLAB from one

for i in range(2,10):
    array[i] = array[i-1] + value

have a good time!

answered Dec 31, 2021 at 13:46

Reza Tanakizadeh

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