Cumulative value and months

[alexandernatale]

I have a table like this:

Data |Cumulative_value |

I need to calculate a difference between a value at start month and a value at finish month.

Any ideas? I don't use script but i need this data for histogram for example..

I attached a xls for a example of the table and the result of the elaboration

[Taoufiq_Zarra]

May be :

Data:
LOAD Month(Date)&'/'&Year(Date) as ID, * INLINE [
    Date, Cumulative Value
    01/01/2020, 10
    02/01/2020, 15
    03/01/2020, 190
    04/01/2020, 150
    05/01/2020, 79
    06/01/2020, 59
    07/01/2020, 0
    08/01/2020, 65
    09/01/2020, 69
    10/01/2020, 35
    11/01/2020, 48
    12/01/2020, 44
    13/01/2020, 38
    14/01/2020, 36
    15/01/2020, 81
    16/01/2020, 90
    17/01/2020, 17
    18/01/2020, 48
    19/01/2020, 77
    20/01/2020, 55
    21/01/2020, 0
    22/01/2020, 9
    23/01/2020, 5
    24/01/2020, 59
    25/01/2020, 71
    26/01/2020, 22
    27/01/2020, 50
    28/01/2020, 31
    29/01/2020, 22
    30/01/2020, 99
    31/01/2020, 100
    01/02/2020, 85
];


output:
noconcatenate

load  ID,(FirstSortedValue([Cumulative Value],-Date(Date))-FirstSortedValue([Cumulative Value],Date(Date))) as Month_incremental resident Data group by ID;
drop table Data;

[alexandernatale]

Thank you @Taoufiq_Zarra .
I use qliksense and the script don't work.. 😞

It's possible to integrate expression into graph?

[Taoufiq_Zarra]

@alexandernatale 

normally it's the same, attached Qliksense Version