applying the formula into the data

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评论： Nurul Ain Basirah Zakaria 2021-4-17

Hi. Can someone please help me to understand this formula:

where;

SSPI is SPI value below the threshold

K is drought threshold

T is duration of drought processes

and if I can apply it to my matrx data in Matlab?

Star Strider 2021-4-17

What is the calculation doing?

What are

, and

and the rest? Are they vectors or matrices, and how does n affect them?

it is an index,

i have a for instance,

420x32x20 as time(precipitation value)xlonxlat

so i need to:

find all the SSPI is SPI value below the threshold in each grid (threshold is k=-1)

and then T is how many there is of drought month (which is month with value -1 till -3

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