[ncl-talk] SPI calculation

[Soma Roy]

Hello,

I am trying to calculate standadize precipitation index using monthly
gridded dataset.

Dimension of data is like below;
Rainfall(12x41) (months x years).

I am using the script from the below link;
https://www.ncl.ucar.edu/Applications/Scripts/spi_2.ncl

But in my dataset there is no variable as "date".

Can we manually set the date range inside the script?

I am using rainfall dataset for 1970-2010.

Please kindly inform me how we can modify it over the same script.

Thanking you,
Soma
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