## Level 2 Sprint 3 INV01 - Not 1st week of Timescale?  Contributor

## Level 2 Sprint 3 INV01 - Not 1st week of Timescale?

Hello,
I used the "NOT INPERIOD(CURRENTPERIODSTART())"  formula to calculate to determine if it's the first week of the time scale or not and it's working. But i know that if we change the current period my formula doesn't not work anymore. I couldn't find a formula that targets the start of time scale and not the current period. Could you help me ? @einas.ibrahim

Thank you

Younes

2 ACCEPTED SOLUTIONS

Accepted Solutions  Moderator

Simplest and easiest way to find out the First period of the Timescale is

OFFSET(1,-1,0) = 0

Hope that helps  Moderator

Sure!!

First let's try to understand what OFFSET does? It basically Pulls or Pushes the numbers across the timescale. There are three parameters that are needed in the Syntax

OFFSET(x,n,z) where x is the source line item to offset

n is the offset value

z is fill value if the result is outside the timescale

Result matches the data format of x - meaning it can be number, boolean or anything else.

FORMULA: OFFSET(1,-1,0) = 0

If you take a look at the left hand side of the formula OFFSET(1,-1,0) it basically throws an output of 1 in all the time periods except the first time period. That is because you are hard coding your first parameter to 1 and then you are asking Anaplan to Push it further by 1 period in the second parameter. Hence the first parameter which is 1 gets pushed to subsequent periods. If you look at the overall formula now OFFSET(1,-1,0) = 0 it checks the condition and looks for a time period which has 0 in it and matches with that time period. Now Let's take a look at Second parameter. Here the ask was to find out the first period of the timescale hence second parameter was kept  -1. If the ask is to find out first 3 periods of the timescale you can change the second parameter from -1 to -3 ( Its minus because we have to push the values to subsequent periods) Note: First Parameter doesn't necessarily has to be 1, it can be any number apart from 0

Hope that clarifies it

19 REPLIES 19  Moderator

Simplest and easiest way to find out the First period of the Timescale is

OFFSET(1,-1,0) = 0

Hope that helps   Master Anaplanner/Community Boss

@Misbah 😠

I was going to help @Younes arrive at that by himself.
Hey @Younes let us know if you have other questions or need more explanation on this formula 😊

Einas
"Give a Man a Fish, and You Feed Him for a Day. Teach a Man To Fish, and You Feed Him for a Lifetime"  Moderator

Apologies.

Usually I don't share the formula esp with Level 3 aspirants but for Level 2 & Level 1 I help them in creating SYS Modules only.  Contributor

Hello @einas.ibrahim @Misbah
Thank you for your help. I'd like to understand more the formula. How does Anaplan know with this formula that we are talking about the Time scale whe writing OFFSET(1,-1,0) ?

Younes  Moderator

Sure!!

First let's try to understand what OFFSET does? It basically Pulls or Pushes the numbers across the timescale. There are three parameters that are needed in the Syntax

OFFSET(x,n,z) where x is the source line item to offset

n is the offset value

z is fill value if the result is outside the timescale

Result matches the data format of x - meaning it can be number, boolean or anything else.

FORMULA: OFFSET(1,-1,0) = 0

If you take a look at the left hand side of the formula OFFSET(1,-1,0) it basically throws an output of 1 in all the time periods except the first time period. That is because you are hard coding your first parameter to 1 and then you are asking Anaplan to Push it further by 1 period in the second parameter. Hence the first parameter which is 1 gets pushed to subsequent periods. If you look at the overall formula now OFFSET(1,-1,0) = 0 it checks the condition and looks for a time period which has 0 in it and matches with that time period. Now Let's take a look at Second parameter. Here the ask was to find out the first period of the timescale hence second parameter was kept  -1. If the ask is to find out first 3 periods of the timescale you can change the second parameter from -1 to -3 ( Its minus because we have to push the values to subsequent periods) Note: First Parameter doesn't necessarily has to be 1, it can be any number apart from 0

Hope that clarifies it  Contributor

Tanks a lot @Misbah , that is extremely helpful !   Master Anaplanner/Community Boss

Hey @Younes

Here is how I translate "my command" OFFSET(1,-1,0)

"Please Mrs. Engine - Yes the Anaplan engine is a she- offset or move the number 1, by 1 prior position (-1) from each period you calculate, and when you can't go back any further let me know by returning a 0"

Since what we need is to determine 1st week (or not), a function like OFFSET is useful because it is bound by the model timescale. It acts in a certain way within the timescale and acts differently otherwise (in this case returns 0). We use this behavior to capture the time period when the formula acts differently - the 1st period.

Einas
"Give a Man a Fish, and You Feed Him for a Day. Teach a Man To Fish, and You Feed Him for a Lifetime"  Occasional Contributor

Thank you soooo much @Misbah , I had been stuck on this part forever! Frequent Contributor

Shouldn't we need to avoid hard coding in the formulas? I mean that's what training teaches us.

Is that the only way to find out the first week's condition?

Just trying to understand.